Picotest M3500A - Page 113

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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 10
µ
A 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 100
µ
A 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 his 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