Offset Test; Operational Verification Tests - HP 3457A Service Manual

Operational Verification Tcsts
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 t o provide a more rapid means of testing the performance of the HP
3457A. T h e
Operational Verification Tests are designed t o provide a 90% confidence that the instrument is operational
and that it meets its specifications.
DC Voltage Operational Verification Tests
DC
VOLTAGE
1
SOURCE
1
Figure 4-12. DCV Operational Verification Test Connections
I
NOTE
I
T h e fempcratrrre of the envrronrntJn/ where these tt)sts are lo he perlormed rnlilt hr
within 5-5
C o/ t h t ~ tt'mpwallirc
W ~ C Y C
the in~trlrrncnt war cctlrhratcd. Thc inttrrtmcnt
was calrbrated at the laclory rn an urru wrlh a trmptJra/llrt) o/ 20
O
C
f
+
1
O
C).
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 instri~ment probably needs
repair.
3. Run the
AUTO CAL routine. (Press the AUTO CAL key, enter the number
1 and press the
ENT key).
4-66. DC Voltage Function
-
Offset Test
4-67. Equipment Required. A low thermal short (copper wire) is required f o r this procedure.
1. Connect a low thermal short across the Front Panel HI and LO Input Terminals.