Measurement device with function of measuring capacitance

A measuring device, capacitance measuring technology, applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as long charging time, and achieve the effect of simple control method

Active Publication Date: 2011-05-25
RIGOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason is that under the same charging current, it takes a longer charging time to make the voltage across the large capacitor reach the set voltage value

Method used

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  • Measurement device with function of measuring capacitance
  • Measurement device with function of measuring capacitance
  • Measurement device with function of measuring capacitance

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0044] The best implementation mode of the present invention will be introduced in detail below.

[0045] refer to figure 2 , the measuring device 2 includes a capacitance measuring terminal 207, a charging module 216, a discharging module 217, an A / D conversion module 209, a dual-limit comparator 210, a control processing module 215, a display module 213 and an input module 214, and a first voltage divider circuit 205 and the second voltage divider circuit 206 . The charging module 216 includes a charging constant current source 201 and a charging switch 202 , the discharging module 217 includes a discharging constant current source 203 and a discharging switch 204 , and the control processing module 215 includes a digital logic circuit 211 and a processor system 212 .

[0046] In this embodiment, the measuring device 2 is a digital multimeter. As another implementation manner, the measuring device 2 may also be other devices with a capacitance measuring function, for exampl...

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Abstract

The present invention provides a measurement device with a function of measuring capacitance, which comprises a capacitance measurement end (207), a charging module (216), a discharging module (217), an A/D (analog/digital) conversion module (209), a double-limit comparator (210), a control processing module (215), a first voltage division circuit (205) and a second voltage division circuit (206). The charging timer of the control processing module (215) has two charging ending conditions: the maximum charging time and the first threshold voltage VH. When the charging ending conditions are satisfied, the charging timer stops timing, and the A/D conversion module (209) is controlled to measure the voltage. By adopting the method, the charging time delta t and the voltage delta V in the formula C = Ic delta t/ delta V can be obtained, and the capacitance of a capacitor (208) to be measured can be calculated. The measurement device solves the problem of the prior art that the existing measurement device can not automatically adapt to measurement of small capacitance and large capacitance.

Description

technical field [0001] The invention relates to the field of measuring devices, in particular to the field of capacitance measuring devices. Background technique [0002] In the prior art, in order to improve the accuracy of small capacitance measurement and the speed of large capacitance measurement, many measurement methods are adopted. [0003] In the Chinese patent application "Method for Measuring Capacitance with Mirrored Constant Current Source" (publication number 101082644A), a capacitance measurement method is introduced. like figure 1 As shown, the measurement device 1 includes a measured capacitor 101, a mirror image constant current source charging and discharging module 102, a voltage detection module 107, a control module 108 and a clock generator 109 connected in series in sequence, and the mirror image constant current source charging and discharging module 102 includes a constant Current source 103 , charge and discharge circuit 104 , mirror circuit 105 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 王悦王铁军李维森
Owner RIGOL
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