4 Performance Verification Tests
76 Keysight 3458A Calibration Manual
Frequency Counter Performance Tests
Required equipment
The following equipment is required for testing the frequency counter
performance of the 3458A.
– Stable frequency source (Keysight 3325A Frequency Synthesizer or equivalent)
– Shielded test leads, BNC to dual banana plug (such as Keysight 11001-60001)
Preliminary steps
1 Verify that the frequency source is properly warmed up.
2 The 3458A requires a 4-hour warm-up period. If this has not been done, turn
the instrument ON and allow it to warm up before proceeding.
3 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”.
4 Configure the DMM under test as follows:
–FREQ
–Trig SGL
–FSOURCE ACDCV
– LEVEL 0,DC
Frequency counter accuracy test
1 Execute FSOURCE ACDCV (specifies the type of signal to be used as the input
signal for frequency measurement).
2 Set the Frequency Standard to output a 1 volt p-p, 1 Hz sine-wave. Record the
exact Frequency Standard Value on the FREQUENCY TESTS Test Card.
Connect the output of the Frequency Standard to the HI and LO input
terminals of the 3458A under test.
3 Execute Trig and record the Unit Under Test Reading on the FREQUENCY
TESTS Test Card.
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