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Models 2601A, 2602A, 2611A, 2612A, 2635A, 2636A
Models 2601B, 2602B, 2604B, 2611B, 2612B, 2614B, 2634B, 2635B, 2636B
This was found by adding a multimeter in series with the supply. Agilent 34411a and 34401a, normal 6-1/2 digit multimeters. Taking the chip out of its reset state sometimes displays the correct current on the 2600, but most of the time one or both current readings are wrong.
The 2600 is in it's power on default state.
Why is the 2600 doing this? How does the measurement principle of a source meter differ from a multimeter?
How can I do reliable measurements with this instrument?
The attached - shows the currents being measured channel B: 19uA on both the source and the multimeter and channel A: 87uA on the multimeter and -7nA on the source meter.
- IMAG0434ansm.jpg (117.45 KiB) Viewed 15805 times
Please list your 2600 SMU test conditions, source and measure stimulus per channel, source and measure range on SMU, how you connect to your device, 2W/4W. What is the capacitive load of your device and any other pertinent information.
Also the attached document below, differentiate a DMM from SMU.
Hope this helps!
- SMU Description
- (1.15 MiB) Downloaded 1424 times
k2602.write("smua.source.limiti = 0.01")
k2602.write("smub.source.limiti = 0.01")
k2602.write("smub.source.levelv = 3.3")
k2602.write("smua.source.levelv = 3.3")
k2602.write("display.smua.measure.func = display.MEASURE_DCAMPS")
k2602.write("display.smub.measure.func = display.MEASURE_DCAMPS")
k2602.write("smua.source.output = smua.OUTPUT_ON")
k2602.write("smub.source.output = smub.OUTPUT_ON")
The range is the 'reset default' or AUTO.
The expected currents are +/-19uA and 70-90uA.
Connection is 2 wire.
Capacitance is cabling, one 100nF decoupling capacitor and the dut.
- k2600.jpg (60.48 KiB) Viewed 15778 times
The output started to oscillate and some noise on the supply could be observed with the oscilloscope.
k2602.write("smua.source.highc = smua.ENABLE")
k2602.write("smub.source.highc = smua.ENABLE")
Putting the device in 'high capacitance' mode solves the problem.
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