Electric energy meter isolation high-speed photoelectric communication device and intelligent electric meter

Abstract

The utility model provides an electric energy meter isolation high-speed photoelectric communication device and an intelligent electric meter. The electric energy meter isolation high-speed photoelectric communication device comprises a central processor, and an infrared emission module and an infrared receiving module which are respectively connected with the central processor. The infrared transmitting module comprises an ultra-high-speed inverter and an infrared transmitting tube, the ultra-high-speed inverter is respectively connected with the central processing unit and the infrared transmitting tube, the ultra-high-speed inverter is also respectively connected with a positive power supply and a ground wire, and the infrared transmitting tube is also connected with the ground wire; the infrared receiving module comprises an ultra-high-speed comparator, an infrared receiving tube, a sampling resistor and a threshold voltage generating unit, and the ultra-high-speed comparator is connected with the central processing unit and the threshold voltage generating unit; the ultra-high-speed comparator is further connected between the infrared receiving tube and the sampling resistor, the ultra-high-speed comparator is further connected with a positive power supply and a ground wire, the infrared receiving tube is further connected with the positive power supply, and the sampling resistor is further connected with the ground wire. According to the utility model, high-baud-rate infrared communication can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric meters, and in particular relates to an electric energy meter isolation high-speed photoelectric communication device and an intelligent electric meter. Background Art

[0002] Traditional electronic energy meters usually set the communication baud rate between 600bps and 9600bps when performing local infrared communication. This baud rate range can meet the basic data transmission needs of early electronic energy meters, such as reading energy meter data, performing simple parameter configuration and status monitoring. However, with the development of modern smart grid and Internet of Things technologies, electronic energy meters are not limited to simple data collection, but also need to process a large amount of real-time data, including complex metering information, user electricity consumption behavior data, remote control instructions and a variety of real-time status monitoring information. These new functions and data transmission requirements make the existing low baud rate infrared communication gradually unable to meet the requirements of practical applications.

[0003] Especially in some application scenarios with high data volume and high real-time requirements, such as smart home systems, industrial automation, remote monitoring and power dispatching systems, the traditional baud rate of 600bps to 9600bps is particularly insufficient. In these scenarios, the delay and reliability of data transmission directly affect the overall performance of the system and user experience. Therefore, the communication baud rate is required to be increased to 1Mbps or even higher to ensure that large amounts of data can be transmitted in real time, quickly and stably.

[0004] However, the existing infrared communication processing circuit design is mainly based on the requirements of lower baud rates, and its hardware and software architecture does not optimize the performance at high baud rates. As a result, in practical applications, the existing circuit cannot guarantee stable communication and high communication success rate at baud rates of 1Mbps or higher. The main problems include: poor signal integrity, large noise interference, high data error rate, increased transmission delay, etc. These problems seriously affect the reliability and practicality of high baud rate communication. Summary of the invention

[0005] The utility model aims to provide an electric energy meter isolation high-speed photoelectric communication device and an intelligent electric meter, which are used to solve the problem that the infrared communication processing circuit cannot meet the requirements of stable communication and communication success rate under high baud rate.

[0006] In order to solve the above technical problems, the present application provides an isolated high-speed optoelectronic communication device for an electric energy meter, characterized in that it comprises a central processing unit, and an infrared transmitting module and an infrared receiving module respectively connected to the central processing unit;

[0007] The infrared emitting module comprises an ultra-high speed inverter and an infrared emitting tube, wherein the ultra-high speed inverter is connected to the central processing unit and the infrared emitting tube respectively, the ultra-high speed inverter is also connected to a positive power supply and a ground wire respectively, and the infrared emitting tube is also connected to the ground wire;

[0008] The infrared receiving module includes an ultra-high-speed comparator, an infrared receiving tube, a sampling resistor and a threshold voltage generating unit. The ultra-high-speed comparator is connected to the central processing unit and the threshold voltage generating unit respectively; the ultra-high-speed comparator is also connected between the infrared receiving tube and the sampling resistor, the ultra-high-speed comparator is also connected to a positive power supply and a ground wire respectively, the infrared receiving tube is also connected to the positive power supply, the sampling resistor is also connected to the ground wire, and the threshold voltage generating unit is configured to generate a threshold voltage for use by the ultra-high-speed comparator during comparison.

[0009] In one embodiment of the present invention, an infrared lamp current limiting resistor is further provided between the ultra-high speed inverter and the infrared emitting tube.

[0010] In one embodiment of the present invention, it further includes a first decoupling capacitor and a second decoupling capacitor;

[0011] The first decoupling capacitor is connected between the ultra-high-speed inverter and the positive power supply, and the first decoupling capacitor is also connected to the ground line;

[0012] The second decoupling capacitor is connected between the ultra-high speed comparator and the positive power supply, and the second decoupling capacitor is also connected to a ground line.

[0013] In one embodiment of the present invention, a first filter capacitor is further included, one end of the first filter capacitor is connected between the sampling resistor and the infrared receiving tube, and the other end of the first filter capacitor is connected to the ground line.

[0014] In one embodiment of the present invention, the threshold voltage generating unit includes a first preset resistor and a second preset resistor, a positive power supply, the first preset resistor, the second preset resistor and a ground line are connected in sequence, and the ultra-high-speed comparator is connected between the first preset resistor and the second preset resistor.

[0015] In one embodiment of the present invention, a second filter capacitor and a third filter capacitor are also included;

[0016] The second filter capacitor is connected in parallel with the first preset resistor;

[0017] The third filter capacitor is connected in parallel with the second preset resistor.

[0018] In one embodiment of the present invention, a third preset resistor is further included, one end of the third preset resistor is connected to the first preset resistor, and the other end of the third preset resistor is connected to a common connection end formed by the second filter capacitor and the second preset resistor.

[0019] In one embodiment of the present invention, a serial port pull-up resistor is further included, one end of the serial port pull-up resistor is connected between the central processing unit and the ultra-high-speed comparator, and the other end of the serial port pull-up resistor is connected to a positive power supply.

[0020] In order to solve the above technical problems, the utility model also provides a smart electric meter, characterized in that it includes an electric meter body and an electric energy meter isolation high-speed optoelectronic communication device connected to the electric meter body, the electric energy meter isolation high-speed optoelectronic communication device is the electric energy meter isolation high-speed optoelectronic communication device as described above, and the central processor of the electric energy meter isolation high-speed optoelectronic communication device is the central processor of the electric energy meter body.

[0021] Compared with the prior art, the electric energy meter isolation high-speed photoelectric communication device and the smart electric meter proposed by the utility model have the following beneficial effects:

[0022] By using two ultra-high-speed logic devices, ultra-high-speed inverter and ultra-high-speed comparator, the switching and comparison of signals can be completed within nanoseconds, effectively reducing the delay and distortion of signals during transmission, ensuring that high-frequency signals can be accurately processed and transmitted, and achieving infrared two-way transceiver communication at a maximum rate of 10Mbps. This avoids the technical problem of signal distortion and errors caused by the slow response speed in traditional infrared communication circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 The schematic diagram of the structure of the electric energy meter isolation high-speed photoelectric communication device described in the embodiment of the utility model is shown.

[0025] Figure 2 A schematic diagram of an infrared emission module in an isolated high-speed optoelectronic communication device for an electric energy meter according to an embodiment of the utility model is shown.

[0026] Figure 3 A schematic diagram of an infrared receiving module in an isolated high-speed optoelectronic communication device for an electric energy meter according to an embodiment of the utility model is shown.

[0027] Figure 4 A schematic structural diagram of a smart electric meter according to an embodiment of the utility model is shown.

[0028] Description of reference numerals:

[0029] MCU is the central processing unit, DVDD is the positive power supply, GND is the ground, R1 is the infrared lamp current limiting resistor, C1 is the first decoupling capacitor, D1 is the infrared transmitting tube, R2 is the serial port pull-up resistor, C2 is the second decoupling capacitor, R0 is the sampling resistor, D2 is the infrared receiving tube, XC1 is the first filter capacitor, XC2 is the second filter capacitor, XC3 is the third filter capacitor, XR1 is the first preset resistor, XR2 is the second preset resistor, XR3 is the third preset resistor, U1 is an ultra-high-speed inverter, in which NC is an empty pin, INA is an unused input pin, GND is a ground pin, OUTY is an output pin, and VCC is a power supply pin; U2 is an ultra-high-speed comparator, in which OUT is an output pin, -VS is a ground pin, +IN is a positive input pin, -IN is a negative input pin, and +VS is a power supply pin. DETAILED DESCRIPTION

[0030] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0031] Embodiment 1

[0032] In order to solve the above technical problems existing in the prior art, an embodiment of the utility model provides an isolated high-speed photoelectric communication device for an electric energy meter.

[0033] Figure 1 The schematic diagram of the structure of the high-speed photoelectric communication device for isolating an electric energy meter according to the embodiment of the utility model is shown. Figure 1 As shown, the electric energy meter isolation high-speed optoelectronic communication device provided by the embodiment of the utility model includes a central processing unit and an infrared transmitting module and an infrared receiving module respectively connected to the central processing unit. Specifically, the TXD pin of the central processing unit is connected to the infrared transmitting module, and the RXD pin of the central processing unit is connected to the infrared receiving module.

[0034] Figure 2 The schematic diagram of the infrared emission module in the electric energy meter isolation high-speed optoelectronic communication device according to the embodiment of the utility model is shown, with reference to Figure 2As shown, the infrared transmitting module includes an ultra-high-speed inverter U1 and an infrared transmitting tube D1. The ultra-high-speed inverter U1 is connected to the central processing unit MCU and the infrared transmitting tube D1 respectively. The ultra-high-speed inverter U1 is also connected to the positive power supply DVDD and the ground wire GND respectively. The infrared transmitting tube D1 is also connected to the ground wire GND. The central processing unit MCU is configured to send a digital signal to the super inverter U1 to drive the infrared transmitting tube D1 to emit infrared light. Specifically, the input pin INA of the super inverter U1 is connected to the TXD pin MCU_TXD of the central processing unit MCU. MCU_TXD is the serial data transmission port of the central processing unit MCU, which is used to output a high-level or low-level digital signal. The super inverter U1 is a logic gate whose output signal is opposite to the input signal. It can complete the signal inversion in a very short time. If MCU_TXD outputs a high-level signal, it becomes a low-level after being reversed by U1; if MCU_TXD outputs a low-level signal, it becomes a high-level after being reversed by U1. The infrared transmitting tube D1 is a device that converts an electrical signal into an infrared light signal. When current passes through it, it emits infrared light. The inverted signal reaches the infrared emitting tube D1 through the output pin OUTY of the ultra-high-speed inverter U1. When the ultra-high-speed inverter U1 outputs a high level, the current passes through the infrared emitting tube D1, causing it to emit infrared light. When the ultra-high-speed inverter U1 outputs a low level, the infrared emitting tube D1 stops emitting light. Therefore, the infrared signal is emitted through the infrared emitting module.

[0035] The infrared receiving module includes an ultra-high-speed comparator, an infrared receiving tube, a sampling resistor and a threshold voltage generating unit. The ultra-high-speed comparator is connected to the central processing unit and the threshold voltage generating unit respectively. The ultra-high-speed comparator is also connected between the infrared receiving tube and the sampling resistor. The ultra-high-speed comparator is also connected to the positive power supply and the ground wire respectively. The infrared receiving tube is also connected to the positive power supply, and the sampling resistor is also connected to the ground wire. The threshold voltage generating unit is configured to generate a threshold voltage for use by the ultra-high-speed comparator when comparing. Specifically, Figure 3 The schematic diagram of the infrared receiving module in the electric energy meter isolation high-speed photoelectric communication device according to the embodiment of the utility model is shown. Figure 3 As shown, specifically, the output pin OUT of the ultra-high-speed comparator U2 is connected to the RDX pin of the central processing unit MCU, the positive input pin +IN of the ultra-high-speed comparator U2 is connected to the threshold voltage generating unit, the negative input pin -IN of the ultra-high-speed comparator U2 is connected between the infrared receiving tube D2 and the sampling resistor R0, the power supply pin +VS of the ultra-high-speed comparator U2 is connected to the positive power supply DVDD, and the ground pin -VS of the ultra-high-speed comparator U2 is connected to the ground wire GND.

[0036] An ultra-high-speed comparator is a device that can quickly compare two input voltages and output a digital signal. It has two input terminals, one for inputting a voltage signal and the other for inputting a set threshold voltage. When the input voltage signal exceeds the threshold voltage, the comparator outputs a low-level signal; otherwise, it outputs a high-level signal. The infrared receiving tube is a photodiode. When an external infrared light signal is received, a current proportional to the light intensity is generated. This current flows through the sampling resistor to generate a voltage signal. This voltage signal is input to the ultra-high-speed comparator, and the threshold voltage generated by the threshold voltage generating unit is also input to the ultra-high-speed comparator. When the voltage signal exceeds the threshold voltage, the comparator outputs a low-level signal; when the voltage signal is lower than the threshold voltage, the comparator outputs a high-level signal. The output signal (high or low) of the ultra-high-speed comparator is transmitted to the MCU, and the MCU performs subsequent processing and operation based on the received digital signal. Therefore, through the infrared receiving module, the infrared signal is converted into a digital signal that the MCU can process, realizing the reception and processing of the infrared signal.

[0037] Optionally, an infrared lamp current limiting resistor R1 is further provided between the ultra-high-speed inverter U1 and the infrared emitting tube D1. The infrared lamp current limiting resistor R1 can limit the current flowing through the infrared emitting tube D1 and the ultra-high-speed inverter U1, protecting these components from overload damage, while ensuring the stable operation of the infrared emitting tube D1 and facilitating the thermal management of the circuit, thereby improving the reliability and life of the entire infrared emitting module.

[0038] Optionally, it also includes a first decoupling capacitor C1 and a second decoupling capacitor C2; the first decoupling capacitor C1 is connected between the ultra-high-speed inverter U1 and the positive power supply DVDD, and the first decoupling capacitor C1 is also connected to the ground line GND; the second decoupling capacitor C2 is connected between the ultra-high-speed comparator U2 and the positive power supply DVDD, and the second decoupling capacitor C2 is also connected to the ground line GND. A decoupling capacitor (Decoupling Capacitor), sometimes also called a bypass capacitor (Bypass Capacitor), is a capacitor used in a circuit, which can stabilize the power supply voltage, reduce power supply noise, and suppress electromagnetic interference, and provides a low impedance path to filter out high-frequency noise and transient signals, thereby protecting the ultra-high-speed inverter U1 and the ultra-high-speed comparator U2.

[0039] Optionally, a first filter capacitor is further included, one end of which is connected between the sampling resistor and the infrared receiving tube, and the other end of which is connected to the ground wire. The first filter capacitor can effectively filter out high-frequency noise, smooth the signal, improve signal quality and signal-to-noise ratio, and ensure the stability and reliability of the circuit.

[0040] Optionally, the threshold voltage generating unit includes a first preset resistor XR1 and a second preset resistor XR2, the positive power supply DVDD, the first preset resistor XR1, the second preset resistor XR2 and the ground line GND are connected in sequence, and the ultra-high-speed comparator U2 is connected between the first preset resistor XR1 and the second preset resistor XR2. The two resistors form a voltage divider, which divides the voltage from the positive power supply DVDD to the ground line GND to generate a stable threshold voltage, which is used to input to the ultra-high-speed comparator U2. By setting the resistance values ​​of the first preset resistor XR1 and the second preset resistor XR2, a stable and appropriate threshold voltage can be formed, thereby ensuring that the ultra-high-speed comparator U2 can correctly determine whether the voltage signal exceeds the threshold voltage.

[0041] Optionally, a second filter capacitor and a third filter capacitor are also included; the second filter capacitor is connected in parallel with the first preset resistor; the third filter capacitor is connected in parallel with the second preset resistor. The second filter capacitor is connected in parallel with the first preset resistor to filter out power supply noise and other high-frequency interference signals, ensuring that the threshold voltage output by the voltage divider is more stable and pure. The third filter capacitor is connected in parallel with the second preset resistor to play a similar filtering role, which helps to further filter out power supply noise and interference, ensuring that the voltage across the second preset resistor is more stable. By filtering out transient noise and high-frequency interference, the threshold voltage generation unit can output a smooth and stable threshold voltage, thereby improving the working stability of the ultra-high-speed comparator U2.

[0042] Optionally, a third preset resistor is further included, one end of the third preset resistor is connected to the first preset resistor, and the other end of the third preset resistor is connected to the common connection end formed by the second filter capacitor and the second preset resistor. The third preset resistor is used to further fine-tune and stabilize the threshold voltage. It works with the first preset resistor and the second preset resistor to form a more complex voltage divider network, which can set the threshold voltage more accurately. By adding the third preset resistor, the voltage distribution can be adjusted and the circuit performance can be optimized to meet different design requirements.

[0043] Optionally, a serial port pull-up resistor R2 is also included, one end of which is connected between the central processing unit MCU and the ultra-high-speed comparator U2, and the other end of the serial port pull-up resistor R2 is connected to the positive power supply DVDD. The pull-up resistor R2 can ensure that the MCU_RXD pin does not float when there is no input signal. By adding the pull-up resistor R2 between the MCU_RXD and the ultra-high-speed comparator U2 output pin OUT, the pin can be prevented from floating, the signal level can be stabilized, and the anti-interference ability can be improved, thereby enhancing the reliability and stability of the circuit and ensuring that the MCU can accurately receive and process the signal from the infrared receiving module. If there is no pull-up resistor R2, when the ultra-high-speed comparator U2 output terminal OUT is in a high-impedance state (i.e., no high level or low level is output), the MCU_RXD pin may be in an uncertain state and easily interfered by noise.

[0044] In the above technical solution, the ultra-high-speed inverter and the ultra-high-speed comparator can also be replaced by a triode to realize infrared reception and transmission, but its high-speed effect is not as good as that of the ultra-high-speed inverter and the ultra-high-speed comparator. Specifically, when the ultra-high-speed inverter U1 is replaced by a triode, MCU_TXD is connected to the base of the triode, the collector of the triode is connected to the ground wire, and the emitter of the triode is connected to the infrared transmitting tube. After the MCU transmits the digital signal, it controls the on-off of the triode to control the infrared transmitting tube, but the delay time of the triode is several hundred nanoseconds and the on-voltage is greatly affected by temperature; when the ultra-high-speed comparator is replaced by a triode, the collector of the triode is connected to MCU_RXD, the base of the triode is connected to the infrared receiving tube, and the emitter of the triode is connected to the ground wire. After the infrared receiving lamp receives the infrared signal, it converts it into a voltage signal through a resistor and compares it with the base voltage of the triode, and controls the triode to output high and low levels. However, compared with the ultra-high-speed comparator, the high-speed level conversion cannot be met when the triode is used, and the receiving sensitivity cannot be well adjusted and is greatly affected by temperature.

[0045] In summary, the utility model of the electric energy meter isolation high-speed photoelectric communication device can complete the switching and comparison of signals within nanoseconds by using two ultra-high-speed logic devices, an ultra-high-speed inverter and an ultra-high-speed comparator, effectively reducing the delay and distortion of signals during transmission, ensuring that high-frequency signals can be accurately processed and transmitted, and can achieve infrared two-way transceiver communication at a maximum of 10Mbps. It avoids the technical problem that the slow reaction speed in the traditional infrared communication circuit will cause signal distortion and errors.

[0046] Embodiment 2

[0047] In order to solve the above technical problems, the utility model also provides a smart electric meter.

[0048] Figure 4 The schematic diagram of the structure of the smart meter according to the embodiment of the utility model is shown. Figure 4 As shown, the smart electric meter of the embodiment of the utility model includes an electric meter body and an electric energy meter isolation high-speed optoelectronic communication device connected to the electric meter body, the electric energy meter isolation high-speed optoelectronic communication device is the above-mentioned electric energy meter isolation high-speed optoelectronic communication device, and the central processor of the electric energy meter isolation high-speed optoelectronic communication device is the central processor of the electric energy meter body.

[0049] In summary, the smart meter of the utility model can complete the switching and comparison of signals within nanoseconds by using two ultra-high-speed logic devices, ultra-high-speed inverter and ultra-high-speed comparator, effectively reducing the delay and distortion of signals during transmission, ensuring that high-frequency signals can be accurately processed and transmitted, and realizing infrared two-way transceiver communication at a maximum of 10Mbps. It avoids the technical problem that the slow reaction speed in the traditional infrared communication circuit will cause signal distortion and errors.

[0050] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. An isolated high-speed photoelectric communication device for an electric energy meter, characterized in that: It includes a central processing unit, and an infrared transmitting module and an infrared receiving module respectively connected to the central processing unit; The infrared emitting module comprises an ultra-high speed inverter and an infrared emitting tube, wherein the ultra-high speed inverter is connected to the central processing unit and the infrared emitting tube respectively, the ultra-high speed inverter is also connected to a positive power supply and a ground wire respectively, and the infrared emitting tube is also connected to the ground wire; The infrared receiving module includes an ultra-high-speed comparator, an infrared receiving tube, a sampling resistor and a threshold voltage generating unit. The ultra-high-speed comparator is connected to the central processing unit and the threshold voltage generating unit respectively; the ultra-high-speed comparator is also connected between the infrared receiving tube and the sampling resistor, the ultra-high-speed comparator is also connected to a positive power supply and a ground wire respectively, the infrared receiving tube is also connected to the positive power supply, the sampling resistor is also connected to the ground wire, and the threshold voltage generating unit is configured to generate a threshold voltage for use by the ultra-high-speed comparator during comparison.

2. The electric energy meter isolation high-speed photoelectric communication device according to claim 1, characterized in that: An infrared lamp current limiting resistor is also arranged between the ultra-high speed inverter and the infrared emitting tube.

3. The electric energy meter isolation high-speed photoelectric communication device according to claim 1, characterized in that: Also includes a first decoupling capacitor and a second decoupling capacitor; The first decoupling capacitor is connected between the ultra-high-speed inverter and the positive power supply, and the first decoupling capacitor is also connected to the ground line; The second decoupling capacitor is connected between the ultra-high speed comparator and the positive power supply, and the second decoupling capacitor is also connected to a ground line.

4. The electric energy meter isolation high-speed photoelectric communication device according to claim 1, characterized in that: It also includes a first filter capacitor, one end of which is connected between the sampling resistor and the infrared receiving tube, and the other end of the first filter capacitor is connected to the ground wire.

5. The electric energy meter isolation high-speed photoelectric communication device according to claim 1, characterized in that: The threshold voltage generating unit includes a first preset resistor and a second preset resistor, a positive power supply, the first preset resistor, the second preset resistor and a ground line are connected in sequence, and the ultra-high-speed comparator is connected between the first preset resistor and the second preset resistor.

6. The electric energy meter isolation high-speed photoelectric communication device according to claim 5, characterized in that: Also includes a second filter capacitor and a third filter capacitor; The second filter capacitor is connected in parallel with the first preset resistor; The third filter capacitor is connected in parallel with the second preset resistor.

7. The electric energy meter isolation high-speed photoelectric communication device according to claim 6, characterized in that: It also includes a third preset resistor, one end of which is connected to the first preset resistor, and the other end of which is connected to a common connection end formed by the second filter capacitor and the second preset resistor.

8. The electric energy meter isolation high-speed photoelectric communication device according to claim 1, characterized in that: It also includes a serial port pull-up resistor, one end of which is connected between the central processing unit and the ultra-high-speed comparator, and the other end of which is connected to a positive power supply.

9. A smart electric meter, characterized in that: The invention comprises an electric energy meter body and an electric energy meter isolation high-speed photoelectric communication device connected to the electric energy meter body, wherein the electric energy meter isolation high-speed photoelectric communication device is the electric energy meter isolation high-speed photoelectric communication device according to any one of claims 1 to 8, and the central processor of the electric energy meter isolation high-speed photoelectric communication device is the central processor of the electric energy meter body.

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