Dc Current Function Offset Test; Dc Current Function Gain Test - Agilent Technologies 3458A Calibration Manual

DC Current Function
Offset Test
DC Current Function
Gain Test
44 Chapter 4 Performance Verification Tests
The following procedure tests the DC current offset specifications with the
input terminals open.
1. Set the 3458A under test to the DC Current Function (DCI).
2. Set the range of the 3458A under test as specified in Table 4
3. Let the instrument sit for 5 minutes to allow the range relays to
thermally stabilize.
4. Execute Trig and record the absolute value of the offset reading of
each range listed in Table 4 on the DC CURRENT TESTS Test Card
provided at the end of this section.
Table 4. Current Offset Performance Tests
Offset Test Number
5. If the offset tests are out of specification, perform another ACAL
before performing step 6 below.
6. If any of the offset readings are beyond the limits specified in the Test
Record, the instrument should be adjusted. Refer to Chapter 3 to make
adjustments.
The following is a step-by-step procedure for all test points that performance
verify gain of the DC current function. The procedure requires alternately
connecting the transfer standard DMM and then the 3458A under test to the
DC verification source as described in the section titled "General Test
Procedure".
1. Connect the DC current source to the transfer standard DMM I and LO
input terminals using low thermal test leads.
2. Set the range of the transfer standard DMM as specified in Table 5.
3. Set the range of the 3458A under test as specified in Table 5.
4. Set the DC source to the current level specified in Table 5.
5. Execute Trig SGL and read the output of the DC current source as
measured with the transfer standard DMM and record this reading in
the "Transfer Standard Reading" column of the DC CURRENT
TESTS Test Card.
6. Remove the connection from the transfer standard DMM to the DC
DMM Range
1 100 uA
2 1 mA
3 10 mA
4 100 mA
5 1 A