Performance Tests; Dc Voltage Performance Tests; Preliminary Steps; Dc Voltage Function . Offset Test - HP 3457A Service Manual

Performance Tests
4-1 2. PERFORMANCE TESTS
T h e Performance Tests are divided into 6 main tests, D C Volts, AC Volts, D C Current, AC Current, Ohms,
and Frequency. Each test can be performed independently of the others. T h e steps within each test,
however, should be performed in order.
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Figure 4-1. DCV Performance Test Connections
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NOTE
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The temperafurr o f fhc cnvrronmrnf whtw t h o r fests are f o he pc~rformt~d ml/.u he'
wilhin +5 C of the /cwpcratl/rc whcrc f h t ~ in.s/rlimcw/ war culihra/c~d. Thc incfrurncwt
was calihrated at the factory in an area with a fempcratl/rr o f 24
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( f
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C).
4-1
3.
Preliminary Steps
1. Turn the instrument ON and allow a o n e hour warm-up period.
2. Be certain all external inputs are disconnected f r o m the H P 3457A. Run the TEST routine. T h e 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 1 and press the ENT key).
DC Voltage Performance Tests
4-14. DC Voltage Function
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Offset Test
4-1 5. Equipment Required. A low thermal short (copper wire) is required f o r this procedure.
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Connect a low thermal short across the Front Panel HI and LO Input Terminals.
2. Set the HP 3457A t o the DC Voltage function (DCV) and the number of digits displayed (DIGITS
DISP) t o six.