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Calibration
Chapter 2
Performance Verification Proced ures
Overload Protection Circuitry Check
This test verifies the voltmeter's overload protection circuitry by
applying a voltage'slightly greater than the range limit. The signals
measured for this test
(+VBB) and pin 9 (-VBB). At the end of the overvoltage sequence, the
input voltage is returned to 0.1 volts to ensure that the voltmeter will
recover to normal operation.
HP 3<IOO B
calibrator
Ranga
Output Voltage
O. tV
0.1 V
0 . 1 V
0.4 V
1 HP
3400B: Select the 0.1 volt range.
2
Calibrator: Select a 0.1 volt ac signal at
frequency output on the Fluke 5700A).
3
External Multimeter: Select the 10 Vdc range with 5v.z digits of
resolution.
4
Measure + VBB (pin 8 on the test connector) and -VBB (pin 9 on
the test connector). Verify that the measured voltages
the limits shown in the table above for a 0.1 volt output from the
calibrator.
5
Increase the calibrator's output voltage from 0.1 volts to 0.4 volts
kHz.
at 1
6
Measure +VBB and -VBB. Verify that the measured voltages
within the limits shown in the table above for a 0.4 volt output
from the calibrator.
7
To ensure that the voltmeter will still operate properly, decrease
the calibrator's output voltage from 0.4 volts to 0.1 volts.
8
Measure +VBB and -VBB. Verify that the measured voltages are
within the limits shown in the table above for a 0.1 volt output
from the calibrator.
26
Procedures
are
dc voltages measured on test connector pin 8
calibrator
Output Frequency
+VBB ReadJng
1 kHz
+ 1 1 .5 V to + 15.5V
1 kHz
+ 1 .0 V to + 5.0 V
1 kHz
-VBB Roadlng
-15.5 V to - 1 1 .5 V
-60 V to
1 0 V
(use the low
are
within
are
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