Checking instrument

Abstract

The utility model discloses a calibrator, which is used for a monitor module of a steam turbine monitoring protection instrument and comprises a calibrator main body, a first comprehensive output channel, a second comprehensive output channel, a key phase output channel, an analog quantity output channel and an analog quantity input channel. According to the utility model, the verification of various monitor modules in the steam turbine monitoring protection instrument can be realized, the instrument can adapt to various steam turbine monitoring protection instruments, the precision is high, the function is comprehensive, the weight is light, the carrying is convenient, and the information storage and transmission are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of turbine monitoring and protection instruments, and particularly relates to a calibrator. Background Art

[0002] Turbine Supervisory Instruments (abbreviated as TSI instruments)

[0003] are one of the key protection devices to ensure the safe operation of steam turbines. It mainly monitors key parameters such as bearing vibration, relative vibration, axial displacement, rotational speed, zero rotational speed, overspeed, eccentricity, differential expansion, cylinder expansion, and stroke of the steam turbine unit. These key parameters of steam turbine operation are important guarantees for ensuring the safe operation of steam turbines. Only by controlling these key parameters that evaluate the quality of steam turbine operation within the designed safe range can the safe operation of the steam turbine be ensured. If these parameters exceed the safety set value of the steam turbine, it will cause major equipment damage accidents. Therefore, ordinary steam turbines must be equipped with Turbine Supervisory Instruments (abbreviated as TSI instruments) to monitor the safe operation parameters of the steam turbine. When the operation parameters of the steam turbine exceed a certain set limit value, the Turbine Supervisory Instruments (abbreviated as TSI instruments) will send out an over-limit signal and force the steam turbine unit to stop to ensure the safety of the unit.

[0004] The Turbine Supervisory Instruments (abbreviated as TSI instruments) are composed of sensors and monitor modules. To ensure the accuracy and precision of the measurement of steam turbine operation parameters, the monitor modules used must be regularly calibrated, which is also mandatory as required by national and industry standards.

[0005] Currently, in China, the national and provincial, municipal, and autonomous region-level metrology and testing research institutes or electric power test research institutes can engage in this business. However, the calibration equipment and instruments used by these units are general equipment and instruments, and the parameters to be calibrated are physical quantities and engineering units. Therefore, it is necessary to convert the physical quantities and engineering units into standard electrical signals for calibration. The data collected is ordinary electrical signals. To determine whether the calibrated monitor module is qualified, complex calculations are required, and professional knowledge of error theory and data processing is needed. Therefore, the professional technical requirements for calibration personnel are relatively high, and they need to undergo specialized professional technical training before they can carry out this calibration work.

[0006] Most of the current calibrators for the monitor modules of Turbine Supervisory Instruments on the market have the following deficiencies:

[0007] The general calibrator has only single-channel signal output, cannot calibrate dual-channel monitor modules, does not have the function of automatically collecting signals from the monitor module, and cannot automatically generate a calibration report for the monitor module.

[0008] By using a general-purpose signal generator and a data acquisition device, together with communication and data processing, the verification of the monitor module is realized. However, this system has defects such as requiring a power supply, being large in size, heavy in weight, and inconvenient to carry.

[0009] Therefore, there is an urgent need to design and develop a portable device that can verify the monitor module of the TSI instrument, so as to facilitate the user to perform the verification of the monitor module on-site. Summary of the Invention

[0010] According to an embodiment of the present invention, there is provided a calibrator for the monitor module of a steam turbine monitoring and protection instrument, which can realize the verification of various monitor modules of the TSI instrument, and is a portable calibrator that can complete functions such as data acquisition, data processing, automatic generation and storage of output reports for the monitor module.

[0011] To achieve the above object, the technical solution of the present invention is to provide a calibrator for the monitor module of a portable steam turbine monitoring and protection instrument, which is mainly used for the accuracy calibration and function test of the monitor module of the steam turbine monitoring and protection instrument. It is a unique compact instrument dedicated to the complete function test of measurement systems such as vibration, displacement, and speed. It can simulate the output signals of various sensors used in the steam turbine monitoring and protection instrument to verify the measurement accuracy of the monitor module and the complete function test of the protection function. It is used to realize the verification of various monitor modules in the steam turbine monitoring and protection instrument, such as vibration monitor modules (bearing vibration monitor, relative vibration monitor, compound vibration monitor, dual-channel vibration monitor, shaft center amplitude monitor, etc.), displacement monitor modules (axial displacement monitor, differential expansion monitor, compensated monitor, inclined plane monitor, cylinder expansion monitor, oil motive stroke, synchronizer stroke, etc.), speed monitor modules (speed monitor, speed & speed increase monitor, zero speed monitor, reverse rotation monitor, eccentricity monitor, key phase module, etc.). It can verify the monitor modules of various brands of TSI instruments at home and abroad and complete the verification requirements for all TSI monitor modules. Its core is to generate the required signals by a microcontroller and communicate with the computer. The calibrator is actually a high-precision signal generator installed in a compact aluminum box. This instrument does not require an external power supply. When the module calibrator is connected to the computer through a USB cable, the computer supplies power to the calibrator through the USB communication cable; it includes: a calibrator main body, a first comprehensive output channel, a second comprehensive output channel, a key phase output channel, an analog output channel, and an analog input channel;

[0012] The first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog output channel, and the analog input channel are arranged in the calibrator main body and are connected to a computer installed with the calibrator calibration software;

[0013] The calibrator main body is connected to the monitor module through the first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog quantity output channel and the analog quantity input channel;

[0014] The first comprehensive output channel and the second comprehensive output channel are used to output AC signals, DC signals, frequency signals or AC-DC mixed signals;

[0015] The key phase output channel is used to output a pulse signal in the same phase as the first comprehensive output channel;

[0016] The analog quantity output channel is used to output current signals;

[0017] The analog quantity input channel is used to collect the signals of the monitor module and transmit them to the computer.

[0018] Furthermore, a USB port is also provided on the calibrator main body, and the calibrator main body is connected to the computer through the USB port.

[0019] Furthermore, five connection terminals are provided on the surface of the calibrator main body, and the five connection terminals correspond to the first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog quantity output channel and the analog quantity input channel one by one.

[0020] Furthermore, the first comprehensive output channel includes: a first D / A conversion circuit, a resistor attenuation network, a programmable gain amplifier, a signal generator and an adder;

[0021] The input ends of the first D / A conversion circuit, the resistor attenuation network, the programmable gain amplifier and the signal generator are connected to the computer;

[0022] The output end of the signal generator is connected to the programmable gain amplifier;

[0023] The output end of the programmable gain amplifier is connected to the resistor attenuation network. The programmable gain amplifier controls and adjusts the amplitude of the AC signal, and the resistor attenuation network precisely adjusts the amplitude of the AC signal;

[0024] The output ends of the first D / A conversion circuit and the resistor attenuation network are connected to the adder, and the adder superimposes the DC signal output by the first D / A conversion circuit and the AC signal output by the resistor attenuation network;

[0025] The adder is used to output AC signals, DC signals, frequency signals or AC-DC mixed signals.

[0026] Furthermore, the structure of the second comprehensive channel is the same as that of the first comprehensive channel.

[0027] Furthermore, the key phase output channel includes: a trigger and a first signal processing circuit;

[0028] The input terminal of the trigger is connected to the output terminal of the first synthesis channel, and the trigger shapes the AC waveform in the first synthesis channel into a square wave signal;

[0029] The output terminal of the trigger is connected to the first signal processing circuit. The first signal processing circuit processes the square wave signal into a pulse signal and outputs it.

[0030] Furthermore, the analog output channel includes: a second D / A conversion circuit and a second signal processing circuit;

[0031] The input terminal of the second D / A conversion circuit is connected to the computer, and the output terminal of the second D / A conversion circuit is connected to the second signal processing circuit;

[0032] The second D / A conversion circuit converts the digital signal into an analog signal, and the signal processing circuit converts the voltage signal into a current signal and outputs it.

[0033] Furthermore, the analog input channel: an A / D conversion circuit and a third signal processing circuit;

[0034] The output terminal of the third signal processing circuit is connected to the input terminal of the A / D conversion circuit, and the output terminal of the A / D conversion circuit is connected to the computer;

[0035] The third signal processing circuit converts the current signal into a voltage signal, and the A / D conversion circuit converts the analog voltage signal into a digital signal for the computer to read.

[0036] According to the calibrator of the embodiment of the present invention, it can realize the calibration of various monitor modules in the turbine monitoring and protection instrument, can adapt to various turbine monitoring and protection instruments, has high precision, comprehensive functions, light weight, is convenient to carry, and is convenient for information storage and transmission.

[0037] It should be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology. Brief Description of the Drawings

[0038] Figure 1 It is a schematic diagram of the connection terminals of the calibrator according to the embodiment of the present invention;

[0039] Figure 2 It is a schematic diagram of the comprehensive output channel of the calibrator according to the embodiment of the present invention;

[0040] Figure 3 It is a schematic diagram of the overall framework of the calibrator according to the embodiment of the present invention;

[0041] Figure 4 It is a wiring schematic diagram of the first embodiment of the calibrator according to the embodiment of the present invention;

[0042] Figure 5 Schematic wiring diagram of Embodiment 2 of the calibrator according to an embodiment of the present invention;

[0043] Figure 6 Schematic wiring diagram of Embodiment 3 of the calibrator according to an embodiment of the present invention;

[0044] Figure 7 Schematic wiring diagram of Embodiment 4 of the calibrator according to an embodiment of the present invention; Detailed implementation manners

[0045] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and the present invention will be further elaborated.

[0046] First, in combination with Figures 1 - 7 A calibrator according to an embodiment of the present invention is described, which is used for a monitor module of a steam turbine monitoring and protection instrument, and has a wide range of application scenarios.

[0047] As Figures 1 - 7 shown, the calibrator according to an embodiment of the present invention, which is used for a monitor module of a steam turbine monitoring and protection instrument, includes: a calibrator main body, a first comprehensive output channel, a second comprehensive output channel, a key phase output channel, an analog quantity output channel, and an analog quantity input channel.

[0048] Specifically, as Figures 1 - 7 shown, in this embodiment, the first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog quantity output channel, and the analog quantity input channel are arranged in the calibrator main body and are connected to a computer installed with calibrator calibration software; the calibrator main body is connected to the monitor module through the first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog quantity output channel, and the analog quantity input channel; the first comprehensive output channel and the second comprehensive output channel are used to output AC signals, DC signals, frequency signals, or AC / DC mixed signals; the key phase output channel is used to output a pulse signal in the same phase as the first comprehensive output channel; the analog quantity output channel is used to output current signals; the analog quantity input channel is used to collect the signals of the monitor module and transmit them to the computer. In this embodiment, the calibrator main body is also provided with a USB port, and the calibrator main body is connected to the computer through the USB port. In this embodiment, five BNC connection terminals are provided on the surface of the calibrator main body, and the five connection terminals correspond to the first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog quantity output channel, and the analog quantity input channel one by one, as follows:

[0049] Connection terminal CH1 (the first comprehensive output channel) can be controlled by a computer installed with calibration software through a USB communication cable, and the following signals can be accurately output on this channel: AC signal (AC), DC signal (DC), frequency signal, and a mixed signal of AC / DC superposition.

[0050] Connecting terminal CH2 (second integrated output channel), the output signal features are the same as those of connecting terminal CH1. Under the control of the program, it can output AC signals with CH1 output and CH2 output being synchronous, or AC signals with orthogonal phases, simulating and emulating the forward and reverse monitor functions of the steam turbine unit, and can calibrate the forward / reverse monitor module.

[0051] Connecting terminal KEY (key phase signal output), simulating and emulating the key phase signal of the steam turbine unit, the duty cycle of the output pulse is approximately: 10%. The key phase signal is taken from output channel 1 and is synchronous with the signal of output channel 1. The cooperation between output channel 1 (CH1) and key phase output (KEY) can simulate and emulate the eccentricity monitor function of the steam turbine unit, and can calibrate the eccentricity monitor module.

[0052] Connecting terminal AI (analog input), the calibrator collects the recorded output (4 - 20 mA) of the monitor module to test the output accuracy of the monitor module, and completes functions such as data acquisition, data processing, and automatic output of reports for the monitor module.

[0053] Connecting terminal AO (analog output), the output terminal of the calibrator, can output a DC current of 4 - 20 mA, simulating and emulating the output signal of a current-type LVDT sensor, and can calibrate parameters such as cylinder expansion and stroke, and the monitor module using a current-type LVDT sensor.

[0054] Further, as Figure 2As shown, in this embodiment, the first comprehensive output channel includes: a first D / A conversion circuit 2, a resistor attenuation network 3, a programmable gain amplifier 4, a signal generator 5, and an adder 6; the input ends of the first D / A conversion circuit 2, the resistor attenuation network 3, the programmable gain amplifier 4, and the signal generator 5 are connected to a computer; the output end of the signal generator 5 is connected to the programmable gain amplifier 4; the output end of the programmable gain amplifier 4 is connected to the resistor attenuation network 3, and the programmable gain amplifier 4 controls and adjusts the amplitude of the AC signal, and the resistor attenuation network 3 precisely adjusts the amplitude of the AC signal; the output end of the first D / A conversion circuit 2 and the output end of the resistor attenuation network 3 are connected to the adder 6, and the adder 6 superimposes the DC signal output by the first D / A conversion circuit 2 and the AC signal output by the resistor attenuation network 3; the adder 6 is used to output an AC signal, a DC signal, a frequency signal, or a DC-AC mixed signal. The second comprehensive channel has the same structure as the first comprehensive channel. Specifically, the first comprehensive output channel and the second comprehensive output channel are controlled by a CPU control circuit 1; a DC signal D / A conversion circuit 2; a resistor attenuation network 3 for precisely adjusting the amplitude of the AC signal; a programmable gain amplifier 4 (PGA) for controlling and adjusting the amplitude of the AC signal; a signal generator 5 controlled by the CPU control circuit 1 to control the frequency and waveform of the AC signal; an AC / DC signal adder 6 that superimposes the DC signal and the AC signal to generate a DC-AC superimposed mixed signal; and outputs signals at the CH1 and CH2 connection terminals. Through precise adjustment by software, coarse adjustment of the programmable gain amplifier 4 (PGA), and eight-segment precise fine adjustment of the resistor attenuation network 3, the first comprehensive output channel and the second comprehensive output channel can accurately output: an AC signal (AC), a DC signal (DC), a frequency signal, and a DC-AC superimposed mixed signal. Among them, for the AC signal (AC), the amplitude range is 0 to 6Vrms, for the frequency signal, the amplitude range is 0 to 50KHz, for the DC signal (DC), the amplitude range is -22 to 0 to +22VDC, and the output accuracy is less than ±0.1%; at the same time, 2 related signals can be output under the control of dedicated software on the resistor, such as: outputting 2 AC signals with the same phase, outputting 2 orthogonal signals with a phase difference of 90°, etc.

[0055] Further, as Figure 3 shown, in this embodiment, the key phase output channel includes: a trigger 7 and a first signal processing circuit 8; the input end of the trigger 7 is connected to the output end of the first comprehensive channel, and the trigger 7 shapes the AC waveform in the first comprehensive channel into a square wave signal; the output end of the trigger 7 is connected to the first signal processing circuit 8, and the first signal processing circuit 8 processes the square wave signal into a pulse signal and outputs it.

[0056] Further, as Figure 3As shown, in this embodiment, the analog output channel includes: a second D / A conversion circuit 11 and a second signal processing circuit 12; the input end of the second D / A conversion circuit 11 is connected to a computer, and the output end of the second D / A conversion circuit 11 is connected to the second signal processing circuit 12; the second D / A conversion circuit 11 converts digital signals into analog signals, and the signal processing circuit converts voltage signals into current signals and outputs them.

[0057] Furthermore, as Figure 3 shown, in this embodiment, the analog input channel: an A / D conversion circuit 9 and a third signal processing circuit 10; the output end of the third signal processing circuit 10 is connected to the input end of the A / D conversion circuit 9, and the output end of the A / D conversion circuit 9 is connected to a computer; the third signal processing circuit 10 converts current signals into voltage signals, and the A / D conversion circuit 9 converts analog voltage signals into digital signals for the computer to read.

[0058] Specifically, as Figure 3As shown in the figure, the calibrator has a total of 4 signal outputs and 1 signal input, and is connected to the monitor module using BNC connection terminals. In addition to the 5 BNC connection terminals, there is also a USB port for connecting to a computer installed with the calibrator calibration software and providing the power supply for the portable calibrator through this port. The calibrator is small in size, with a total weight of only 0.2 Kg. Inside the calibrator, there is a CPU control circuit 1 that controls and schedules 3 output signals (CH1, CH2, AO) and 1 input signal (AI), and completes the communication and liaison tasks with the host computer; the first integrated output channel, according to the instructions of the CPU control circuit 1, after completing the precise modulation of the DC offset, AC signal frequency, waveform, and amplitude, outputs from the BNC connection terminal CH1 of the first integrated output channel; similarly, the second integrated output channel, according to the instructions of the CPU control circuit 1, after completing the precise modulation of the DC offset, AC signal frequency, and amplitude, outputs from the BNC connection terminal CH2 of the second integrated output channel; the signal of the trigger 7 circuit is taken from the first integrated output channel circuit, and the AC waveform in the first integrated output channel circuit is shaped into a square wave signal through the Schmitt trigger 7, and the square wave signal is processed by the first signal processing circuit 8 to generate a pulse wave signal, and the duty cycle of the output pulse is approximately: 10%; it is output at the BNC connection terminal KEY of the key phase output channel. The key phase signal output does not accept the instructions of the CPU control circuit 1, but is only related to the AC waveform in the first integrated output channel circuit. When there is an AC signal in the first integrated output channel circuit, the BNC connection terminal KEY of the key phase output channel outputs the key phase signal, and the key phase signal and the AC signal in the first integrated output channel circuit are synchronous signals; the recorded output (usually 4 - 20 mA) of the monitor module to be calibrated is connected to the analog input channel through the BNC connection terminal AI. After passing through the third signal processing circuit 10, the 4 - 20 mA current signal is converted into a 1 - 5 VDC voltage signal, and then through the A / D conversion circuit 9, the analog voltage signal is converted into a digital signal for the CPU control circuit 1 to read the DC input signal, completing the acquisition of the monitor module recorded output; the DC output signal controlled by the CPU control circuit 1, after passing through the second D / A conversion circuit 11, converts the digital signal given by the CPU control circuit 1 into an analog signal, and then through the second signal processing circuit 12, converts the 1 - 5 VDC voltage signal into a 4 - 20 mA current signal, and outputs at the BNC connection terminal AO of the analog output channel, serving as the analog simulation signal source when calibrating the monitor module using a current-type LVDT sensor.

[0059] Different wiring methods are adopted for calibrating different monitor modules, which are described in detail as follows:

[0060] 1. Calibration of the monitor module with single-channel input

[0061] 2. Calibration of the monitor module with dual-channel input.

[0062] Example 1: As Figure 4 shown, it is the wiring method of the monitor module operating with single-channel sensor input (non-current-type sensor). The first integrated output channel CH1 of the calibrator is connected to the input end of the monitor module to be calibrated, and the output end of the monitor module is connected to the analog input AI of the calibrator. On a computer installed with the calibrator's dedicated software, corresponding operations can be performed according to the software menu prompts to complete the calibration of the monitor module. In this wiring method, the calibration and function tests of eight monitor modules, namely bearing vibration monitor, relative vibration monitor, dual-channel vibration monitor, axial displacement monitor, differential expansion monitor, speed monitor, speed & acceleration monitor, and key phase, can be completed.

[0063] Example 2: As Figure 5 shown, it is the wiring method of the monitor module operating with single-channel sensor input (current-type sensor). The connection terminal AO of the analog output channel of the calibrator is connected to the input end of the monitor module to be calibrated, and the output end of the monitor module is connected to the connection terminal AI of the analog input channel of the calibrator. On a computer installed with the calibrator's dedicated software, corresponding operations can be performed according to the software menu prompts to complete the calibration of the monitor module. In this wiring method, the calibration and function tests of three monitor modules, namely cylinder expansion, servo valve stroke, and synchronizer stroke, can be completed.

[0064] Example 3: As Figure 6 shown, it is the wiring method of the monitor module operating with dual-channel sensor input. The connection terminal CH1 of the first integrated output channel and the connection terminal CH2 of the second integrated output channel of the calibrator are respectively connected to the input IN1 and input IN2 of the monitor module to be calibrated, and the output end of the monitor module is connected to the connection terminal AI of the analog input channel of the calibrator. On a computer installed with the calibrator's dedicated software, corresponding operations can be performed according to the software menu prompts to complete the calibration of the monitor module. In this wiring method, the calibration and function tests of six monitor modules, namely compound vibration monitor, shaft center amplitude monitor, compensating monitor, inclined plane monitor, zero speed monitor, and reverse monitor, can be completed.

[0065] Example 4: As Figure 7As shown, it is the wiring method of the eccentric monitor module. The connection terminal CH1 of the first integrated output channel of the calibrator is connected to the input of the eccentric monitor module to be calibrated (eccentric sensor input), the connection terminal KEY of the key phase output channel of the calibrator is connected to the input of the eccentric monitor module to be calibrated (key phase sensor input), the output terminal of the monitor module is connected to the connection terminal AI of the analog input channel of the calibrator. On a computer installed with the special software of the calibrator, corresponding operations can be performed according to the software menu prompts to complete the calibration of the monitor module. In this wiring method, the calibration and function test of the eccentric monitor can be completed.

[0066] Through the above 4 different wiring methods, the calibration of 18 monitor modules such as the bearing vibration monitor can be completed.

[0067] Above, with reference to Figures 1 - 7 The calibrator according to the embodiment of the present invention is described. It can realize the calibration of various monitor modules in the steam turbine monitoring and protection instruments, can be adapted to a variety of steam turbine monitoring and protection instruments, has high precision, comprehensive functions, is light in weight, easy to carry, and is convenient for information storage and transmission.

[0068] It should be noted that in this specification, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "comprising..." do not exclude the existence of additional identical elements in the process, method, article or device including the elements.

[0069] Although the content of the present invention has been introduced in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art read the above content, various modifications and substitutions to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A calibrator for the monitor module of a steam turbine monitoring and protection instrument, characterized in that, It includes: a calibrator main body, a first comprehensive output channel, a second comprehensive output channel, a key phase output channel, an analog quantity output channel, an analog quantity input channel, and a USB port; The USB port is arranged on the calibrator main body; The first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog quantity output channel, and the analog quantity input channel are arranged inside the calibrator main body and are connected to a computer installed with calibrator calibration software through the USB port; The calibrator main body is connected to the monitor module through the first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog quantity output channel, and the analog quantity input channel; The structures of the first comprehensive channel and the second comprehensive channel are the same. The first comprehensive output channel and the second comprehensive output channel are used to output AC signals, DC signals, frequency signals, or AC / DC mixed signals; The key phase output channel is used to output a pulse signal in the same phase as the first comprehensive output channel; The analog quantity output channel is used to output a current signal; The analog quantity input channel is used to collect the signals of the monitor module and transmit them to the computer.

2. The calibrator according to claim 1, characterized in that, Five connection terminals are arranged on the surface of the calibrator main body. The five connection terminals correspond to the first comprehensive output channel, the second comprehensive output channel, the key phase output channel, the analog quantity output channel, and the analog quantity input channel one by one. The connection terminals are used to connect the monitor module.

3. The calibrator according to claim 1, wherein The first comprehensive output channel includes: a first D / A conversion circuit, a resistor attenuation network, a programmable gain amplifier, a signal generator, and an adder; The input ends of the first D / A conversion circuit, the resistor attenuation network, the programmable gain amplifier, and the signal generator are connected to the computer; The output end of the signal generator is connected to the programmable gain amplifier; The output end of the programmable gain amplifier is connected to the resistor attenuation network. The programmable gain amplifier controls and adjusts the amplitude of the AC signal, and the resistor attenuation network precisely adjusts the amplitude of the AC signal; The output end of the first D / A conversion circuit and the output end of the resistor attenuation network are connected to the adder. The adder superimposes the DC signal output by the first D / A conversion circuit and the AC signal output by the resistor attenuation network; The adder is used to output AC signals, DC signals, frequency signals, or AC / DC mixed signals.

4. The calibrator according to claim 1 or 3, characterized in that, The key phase output channel includes: a trigger and a first signal processing circuit; The input end of the trigger is connected to the output end of the first comprehensive channel. The trigger shapes the AC waveform in the first comprehensive channel into a square wave signal; The output end of the trigger is connected to the first signal processing circuit. The first signal processing circuit processes the square wave signal into a pulse signal and outputs it.

5. The calibrator according to claim 1, characterized in that, The analog quantity output channel includes: a second D / A conversion circuit and a second signal processing circuit; The input end of the second D / A conversion circuit is connected to the computer, and the output end of the second D / A conversion circuit is connected to the second signal processing circuit; The second D / A conversion circuit converts digital signals into analog signals, and the signal processing circuit converts voltage signals into current signals and outputs them.

6. The calibrator according to claim 1, wherein The analog input channel: an A / D conversion circuit and a third signal processing circuit; The output end of the third signal processing circuit is connected to the input end of the A / D conversion circuit, and the output end of the A / D conversion circuit is connected to the computer; The third signal processing circuit converts current signals into voltage signals, and the A / D conversion circuit converts analog voltage signals into digital signals for the computer to read.

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