HP 3457A Service Manual page 77

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Operational Verification Tests 3457A
4-63. OPERATIONAL VERIFICATION TESTS
4-64, The Operational Verification Tests are an abbreviated version of the Performance Tests. The purpose @
of these tests is to provide a more rapid means of testing the performance of the HP 3457A. The
Operational Verification Tests are designed to provide a 90% confidence that the instrument is operational
and that it meets its specifications.
DC Voltage Operational Verification Tests
— ;
\ Sac
7
WON
RSV
ANSE
7
5 8 7 ple
VOLTAGE
SOURCE
Figure 4-12. DCV Operational Verification Test Connections 2
NOTE
The temperature of the environment where these tests are to be performed must be
within 5° C of the temperature where the instrument was calibrated. The instrument
was calibrated at the factory in an area with a temperature of 20° C (+ 1° ©).
4-65. Preliminary Steps
1. Turn the instrument ON and allow a one hour warm-up period.
2. Be certain all external inputs are disconnected from the HP 3457A. Run the TEST routine. The test
result must read "SELF TEST OK". If the display shows "TEST FAILED", the instrument probably needs
repair.
3. Run the AUTO CAL routine. (Press the AUTO CAL key, enter the number | and press the ENT key).
4-66. DC Voltage Function - Offset Test
4-67. Equipment Required. A low thermal short (copper wire) is required for this procedure.
1, Connect a low thermal short across the Front Panel HI and LO Input Terminals. S