2-Wire Ohms Function Offset Test - Agilent Technologies 3458A Calibration Manual

2-Wire Ohms
Function Offset Test
14 Chapter 2 Operational Verification Tests
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scroll keys to view entire CAL? message. Record the temperatures
on the Test Card.
7. If the instrument self test has not been run, make certain all inputs are
disconnected and execute the TEST function. The display must read
"SELF TEST PASSED".
8. Execute the ACAL OHMS function. This auto calibration will take
approximately ten minutes to complete.
9. Configure the transfer standard DMM as follows:
-- OHM
-- NDIG 8
-- NPLC 100
-- TRIG SGL
10. Configure the DMM under test as follows:
-- OHM
-- NDIG 8
-- NPLC 100
-- TRIG SGL
This procedure operation verifies 2-wire ohms offset for both the front and
rear terminals.
1. Connect a low thermal short across the 3458A front HI and LO
terminals (see Figure 1 in Chapter 3).
2. Verify that the Terminals switch is in the Front position.
Set the 3458A under test to the 10 9 range (function = OHM). Allow
3.
five minutes for the range relays to thermally stabilize.
4. Execute Trig from the front panel two times and use the Operational
Test Card to record the offset reading. Reading must be less than the
limit specified on the test card.
5. Remove the short from the front panel input terminals and connect it
to the rear input HI and LO terminals.
6. Change the Terminals switch to the Rear position.
7. Allow 5 minutes for thermal stabilization.
8. Execute Trig from the front panel two times and record the rear
terminal offset reading on the Operational Test Card. Reading must be
less than the limit specified on the test card. If reading is greater than
the limit. refer to Chapter 3 to make adjustments.