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Resistance measurement with Current Source - del20015U3 LF 356 is used as a constant current source (sink as the current is negative). R4, R5, R7 and R9 set the four resistance ranges by changing the constant current in decade steps. R2 is for calibration of resistance range. The A-B digital control of 4052 selects the range.let voltage current and resistance sockets be separate and of different color or use a high voltage electrical rotary switch or relays if you want the same sockets switched. D1, D2 and R8 are to ensure that the FET can be turned off, as the opamp swings from +/- 3.5V only, with some FET it needs to be tweaked. To view the circuit below, Click the Link of PNG or PDF and view the Circuit, PNG can be Scrolled with Mouse and PDF can be Viewed-Zoomed in the Browsers with Acrobat plugin. The Javascript and Images must be enabled in your Browser. |
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| Resistance measurement with Current Source - del20015 |
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Data sheets and info useful to study and build this circuit. Signametrics - Resistance Measurement with Digital Multimeter Discover Circuits - Constant Current Circuits Current source - Wikipedia, the free encyclopedia Opamp Current Source Tinsley Precision Instruments Resistance Measurement Equipment Keithley Instruments Inc. - Low Current/High Resistance DC Measurements with HP34401A DMM |