A data acquisition device with hot plug protection function and its channel card

A technology for data acquisition and protection functions, which is applied in the direction of measuring devices, program control in sequence/logic controllers, instruments, etc., can solve the problem of damage to the device under test, the inability to effectively protect the device under test, and the data acquisition device does not support heat. Problems such as plugging and unplugging

Active Publication Date: 2017-06-16
RIGOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventor found in the process of realizing the present invention that the existing modular data acquisition devices generally do not support hot plugging, and unexpected power failures or hot plugging of modules occur during current measurement, because they cannot effectively protect The device under test is likely to cause damage to the device under test

Method used

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  • A data acquisition device with hot plug protection function and its channel card
  • A data acquisition device with hot plug protection function and its channel card
  • A data acquisition device with hot plug protection function and its channel card

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Figure 4 It is a schematic structural diagram of the channel card in Embodiment 1 of the present invention. Figure 4 Compared with the fifth embodiment, the circuit complexity of the current channel card shown is reduced, and the switching speed of the channel is also faster than that of the fifth embodiment. The circuit path of the bus switch can prevent the channel from being operated when it is not being measured, and the current path through the bus switch can ensure the closed state of the current bus.

[0049] The structure of the current channel card of Embodiment 1 and the working process of the current channel card are described below:

[0050] 1. There is a channel switch on each channel, and the channel switch keeps the "channel off" state when the current channel card is not working. At this time, the channel switch is connected to the current path mode, and the current signal can pass through the current path circuit of this channel, which ensures that ...

Embodiment 2

[0057] Figure 5 It is a schematic structural diagram of a channel card according to Embodiment 2 of the present invention. The structure of the current channel card of the present embodiment 2 and the working process of the current channel card are described below:

[0058] 1. There is a channel switch on each channel, and the channel switch keeps the "channel off" state when the current channel card is not working. At this time, the channel switch is connected in the current path mode, and the current signal can pass through the current path circuit to ensure that the path of the current signal line of the measurement channel is in the "closed" state. After the current channel card works normally, the channel switch can be opened or closed by related instructions. Close action.

[0059] 2. Each current channel card has a bus switch, and the bus switch keeps the "channel off" state when the current channel card is not working. The channel switch can be opened or closed by ...

Embodiment 3

[0065] Image 6 It is a schematic structural diagram of a channel card according to Embodiment 3 of the present invention. Image 6 The channel card shown enables non-open measurement switching of the current path. The circuit path of the bus switch can prevent the channel from being operated when it is not being measured, and the closed state of the current bus can be ensured through the current path.

[0066] The following describes the current channel card and the working process of the current channel card in Embodiment 3 of the present invention:

[0067] 1. There is a bypass switch and a channel switch on each channel, and the bypass switch remains "closed" when the current channel card is not working. After the bypass switch works normally on the current channel card, it can be opened or closed by relevant instructions. The channel switch remains in the "channel off" state when the current channel card is not operating. The channel switch can be opened or closed by ...

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Abstract

The embodiment of the present invention provides a data acquisition device with hot plug protection function and its channel card, including at least one current measurement channel, each current measurement channel includes two input lines, and each input line includes a current measurement Terminal and an output terminal, the channel card is provided with a protection circuit, the protection circuit is used to automatically start to realize the closed state of the current measurement channel of the channel card when the channel card is powered off, so as to protect the measured device. When the channel card is measuring the current signal, when accidents such as hot plugging or power failure occur, the protection circuit will automatically start to realize the closed state of the current measurement channel, so as to avoid overvoltage or overcurrent caused by the open circuit of the current measurement channel. Cause damage to the device unit under test or the circuit module under test and serious production consequences.

Description

technical field [0001] The invention relates to the field of measurement and testing of electrical signals, in particular to a data acquisition device with a hot plug protection function and a channel card thereof. Background technique [0002] In the technical field of measurement and testing, the so-called data acquisition device refers to a device that automatically collects information from sensors and other measured objects. It can realize the acquisition of various signals. By connecting the data acquisition device with external sensors and sensitive components, or directly connecting with the measured signal, it can collect and measure such as DC voltage signal, AC voltage signal, DC current signal, AC Current signal, frequency signal, temperature signal, pressure signal, pressure signal and other measured signals. [0003] A multi-channel data acquisition device refers to a data acquisition device integrated with multiple measurement functions. It has multiple chann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165G05B19/04
Inventor 张瑞忠王悦王铁军李维森
Owner RIGOL
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