6Service
182 Keysight 34970A/34972A Service Guide
615 Ohms 10 µA source failed This test configures the 10 V range with the internal 10
M 100:1 divider A4U102 connected across the input. The
10 µA current source is connected. A 20 ms ADC measurement is performed and
the result is checked against a limit of 7.5 V ± 3 V.
616 DC current sense failed This test configures the 1 A DC rage and function. A 20
ms ADC measurement is performed and the result is checked against a limit of 0 A
± 5 A. This test confirms that the DC current sense path is functional.
617 Ohms 100 µA source failed This test configures the 10 V range with the internal
10 M 100:1 divider A4U102 connected across the input. The 100 µA current
source is connected. The compliance limit of the current source is measured. A 20
ms ADC measurement is performed and the result is checked against a limit of 5 V
± 1 V.
618 DC high voltage attenuator This test configures to the 300 VDC range. the 500
nA ohms current source is connected to produce a nominal 5 V signal. A 20 ms
ADC measurement is performed and the result is checked against a limit of –10
mV to 70 mV at the output of the rms-to-dc converter.
619 Ohms 1 mA source failed This test configures the 10 V range with the internal 1 0
M 100:1 divider A4U102 connected across the input. The 1 mA current source is
connected. A 20 ms ADC measurement is performed and the result is checked
against a limit of 7 V ± 3.5 V.
620 AC rms zero failed This test configures to the 100 mV AC range with the AC input
grounded through A4K103. The internal residual noise of the AC section is
measured and checked against a limit of –10 mV to 70 mV at the output of the
rms-to-dc converter.
621 AC rms full scale failed This test configures for the 100 mV AC range. The 1 mA
ohms current source is switched on the charge the AC input capacitor A4C301.
This produces a pulse on the output of the rms-to-dc converter which is sampled
100 ms after the current is applied. A 20 ms A/D measurement is performed and
checked against a limit of 10 V ± 8.5 V into the ADC.
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