Programming instructions

Chapter 2 Operational Verification Tests 15
9. Remove the short from the rear input terminals.
4-Wire Ohms
Function Gain Test
The following procedure verifies the gain of the ohms function. The 10 KΩ
point is used for internal electronic calibration using ACAL. The procedure
requires alternately connecting the transfer standard DMM and then the
3458A under test to the resistance verification standard as described in the
Chapter 4 section titled "General Test Procedure".
1. Connect the resistance standard to the transfer standard DMM
4-wire ohms front input terminals.
2. Set the Terminals switch of both DMMs to the Front position.
3. Set the range of the transfer standard DMM to 10 KΩ
(function = OHMF).
4. Set the range of the 3458A under test to 10 KΩ
(function = OHMF).
5. Set the resistance standard to 10 KΩ.
6. Execute Trig from the front panel two times and read the value of the
resistance standard as measured with the transfer standard DMM and
record this reading in the "Transfer Standard Reading'' column of the
Ohms Gain Operational Test Card.
7. Remove the connection between the transfer standard DMM and the
resistance standard.
8. Connect the resistance standard to the 4-wire ohms input terminals of
the 3458A under test.
9. Execute Trig from the front panel two times and read the value as
measured with the 3458A under test and record this value in the "Unit
Under Test Reading" column of the 4-Wire Ohms Function Gain
Operational Test Card.
10. Calculate. and record in the column provided, the difference (absolute
value) between the transfer standard DMM reading and the unit under
test reading for the test.
11. If the difference calculated is greater than the specified limits, refer to
Chapter 3 "Adjustment Procedures", to make adjustments.
12. Disconnect the resistance standard from the 3458A input terminals.
DC Voltage Function
Gain Test
The following procedure verifies the 10V input on the 10V range. This test
verifies the gain of the DC voltage function and checks the point used for
internal adjustments by ACAL. The procedure requires alternately
connecting the transfer standard DMM and then the 3358A under test to the
DC verification source as described in the general test description of