HP 3457A Service Manual page 91

Operational Verification Tests 3457A
Rear Input Operational Verification Tests
(44491A General Purpose Relay Assy) &
2. Close channel 10. (Press the CHAN configuration key, enter the number 10 and press the ENT key).
3. Use the Test Record to record the offset reading of the 3 Kohm range.
4. If any of the offset reading is beyond + 0.000010 KOhm, the instrument should be calibrated or
repaired. Refer to Section V for calibration procedures.
4-106. DC Current Function - 44491A Offset Test Limits
4-107. Equipment Required. This procedure does not require any test equipment.
1. Set the HP 3457A to the DC Current function (DCI), 3 mA range, and the number of digits dis-
played (DIGITS DISP) to six.
2. Use the Test Record to record the current offset readings on the 3 mA and | A ranges.
3. If either of the offset readings are beyond the limits specified in Table 4-34 and on the Test
Record, the instrument should be calibrated or repaired. Refer to Section V for calibration
procedures.
3457A |3457A | 34578 Test Limits
Input |Range | Set Up High | Low
Open 3 mA} OCI +0.000104 mA -0.000104 mA ed
Open | 30 ma} oct +00.00104 mA -00.00104 ma
Table 4-34. DC Current Offset Test Limits (44491A)
Rear Input Operational Verification Tests
(44492A 10 Channel Multiplex Assy)
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44492A RELAY
SHORTING WIRE
Figure 4-22. HP 44492A Terminal Block Assembly Connections J
4-36