Keysight 3458A - 2-Wire Ohms Function Offset Test

2 Operational Verification Tests
30 Keysight 3458A Calibration Manual
–OHM
–NDIG 8
– NPLC 100
–TRIG SGL
7 Configure the DMM under test as follows:
–OHM
–NDIG 8
– NPLC 100
–TRIG SGL
2-wire ohms function offset test
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 3-1 on page 39).
2 Verify that the Terminals switch is in the Front position.
3 Set the 3458A under test to the 10 W range (function = OHM). Allow 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.
9 Remove the short from the rear input terminals.