Keithley 2100

2100-900-01 Rev. D / September 2011 Return to Section Topics 4-43
Model 2100 6 1/2-Digit Resolution Digital Multimeter User’s Manual Section 4: Front Panel Operations
608 Buffer2 offset out of range: This procedure is to test the offset of buffer U508. The result is
checked against a limit of 0 ± 0.1mV.
609 DC gain x1 failed: This procedure is to test the tolerance of DC gain x 1 amplifier. The limit of
gain tolerance is ± 0.005.
610 DC gain x10 failed: This procedure is to test the tolerance of DC gain x 10 amplifier. The limit
of gain tolerance is ± 0.05.
611 DC gain x100 failed: This procedure is to test the tolerance of DC gain x 100 amplifier. The
limit of gain tolerance is ± 0.5.
612 Ohms 500 nA source failed: This test configures to the 10V DC range with the internal 10M
100:1 divider R204 connected across the input. The 500nA ohms current source is connected to
produce a nominal 5V signal. A 20ms ADC measurement is performed and the result is checked
against a limit of 5V ± 1V.
613 Ohms 5 uA source failed: This test configures to the 1000V DC range with the internal 10M
100:1 divider R204 connected across the input. The 5uA ohms current source is connected. The
compliance limit of the current source is measured. A 20ms ADC measurement is performed and
the result is checked against a limit of 0.12V ± 0.01V.
614 DC 1000V zero failed: This test configures to the 1000V DC range with no input applied. A
20ms ADC measurement is performed and the result is checked against a limit of 0V ± 5 mV.
615 Ohms 10 uA source failed: This test configures to the 1000V DC range with the internal 10M
100:1 divider R204 connected across the input. The 10uA ohms current source is connected. The
compliance limit of the current source is measured. A 20ms ADC measurement is performed and
the result is checked against a limit of 0.12V ± 0.01V.
616 DC current sense failed: This test configures to the 3A DC range. A 20ms ADC
measurement is performed and the result is checked against a limit of 0A ± 5A. This test confirms
that the DC current sense path is functional. The test limit is set wide because K303 does not open
the current input during self-test. This test should catch a DC current sense failure without causing
false failures when current inputs are applied during self-test.
617 Ohms 100 uA source failed: This test configures to the 1000V DC range with the internal
10M 100:1 divider R204 connected across the input. The 100uA ohms current source is
connected. The compliance limit of the current source is measured. A 20ms ADC measurement is
performed and the result is checked against a limit of 0.12V ± 0.01V.
618 DC high voltage attenuator failed: This test configures to the 1000 V DC range. The 500nA
ohms current source is connected to produce a nominal 5V signal. A 20ms ADC measurement is
performed and the result is checked against a limit of 5V ± 1V.
619 Ohms 1 mA source failed: This test configures to the 1000V DC range with the internal 10M
100:1 divider R204 connected across the input. The 1mA ohms current source is connected. The
compliance limit of the current source is measured. A 20ms ADC measurement is performed and
the result is checked against a limit of 0.12V ± 0.01V.
620 AC rms zero failed: This test configures for the 100mV AC range with the AC input grounded.
The internal residual noise of the AC section is measured and checked against a limit of -10mV to
70mV at the output of the RMS-to-DC converter.
621 AC rms full scale failed: This test configures for the 100mV AC range. The 1mA ohms
current source is switched on to charge the AC input capacitor C614. This produces a pulse on the
output of the RMS-to-DC converter which is sampled 100ms after the current is applied. A 20ms A/
D measurement is performed and checked against a limit of 2V to 13V into the ADC.
622 DC 10V reference failed: This test configures to the 10V DC range with 5V input applied. A
20ms ADC measurement is performed and the result is checked against a limit of 4.55V ± 0.15mV.