The contact resistance measuring circuit


Posted on Dec 11, 2010

Contact resistance measuring circuit shown in FIG. It mainly consists of a constant current circuit and amplifying circuit. Operational amplifier 1C1 and form a transistor VT a


The contact resistance measuring circuit
Click here to download the full size of the above Circuit.

follower, the voltage across the wind equals the nominal regulator VS1 steady voltage. Since the fixed resistance Ra, therefore, through Rs is a constant-current. Measured resistance string A, B-side, at the connection point with the measured resistance Ken, the current value is small, it can be measured by the resistance of the wind currents regarded as the same voltage, so that, A, B between the end and then only in the A, B-side test the resistance of the (proportional relationship). Electrical resistance measurements translate into voltage measurements. Op amp IC2 and its external RC element constituted an inverting amplifier, voltage A, B between amplification, magnification brother/Rz. c], Cz IC2 is required memory capacitance. Millivoltmeter connected to the output terminal of IC2. Measurement IC2 output voltage. False 102 fixed output voltage Vo, the voltage magnification K., VD1 rated stable voltage Vw, the measured resistance to foot., There/Ct VwR4Rn/R3RZ R Rz Ra V/R4 Vw figure. T, VD3-VD6,1C3 other components constituting the DC power supply, AC power when using the meter, stable 12V output voltage.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

DC-DC Convertor
Capacitance relay
Data Acquisition System I
microcontroller driving a relay with transistor and Opto-isolator
isolated mains power monitoring arduino
Guitar To MIDI Using The LogoChip V2
High Power Led Driver With Dimmer
PLL1706DBQ 3.3-V DUAL PLL MULTICLOCK GENERATOR
Temperature Conversion circuit
4-Channel Thermocouple Input Arduino(TM) compatible Shields and Boards
An experiment in programming the AN6311NFA PLL
A welding load automatic power-off circuit
IC OCL power amplifier circuit



Top