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AC Flatness Adjustment Procedure - 250 kHz Filter
Description
This procedure adjusts the AC calibration constants for the 250 kHz filter.
The AC Flatness Test for the 250 kHz filter (see Chapter 2) is performed
with AC corrections disabled. The results are used to calculate new
calibration constants, which are then transferred to non-volatile memory.
Preliminary Procedure
• Perform a complete autocalibration on the DMM (unless an
autocal has been performed within the last 24 hours).
• Determine the calibration constants by performing Test 2-5 (see
Chapter 2), with the following modification: After resetting the
AFG (step 1), turn off AC corrections using the CAL:STAT:AC
OFF command.
Adjustment Procedure
1. Disable calibration security on the AFG:
CAL:SEC:STAT OFF, <security code> Cal security off
where <code> is the AFG’s security code (factory-set to "E1445A").
2. Verify that the calibration constants determined in the Preliminary
Procedure are acceptable (see SUB Valid_cons in the example
program).
3. Transfer the calibration constants to the AFG in arbitrary block data
format:
CAL:DATA:AC1 <data > Transfer cal constants
NOTE
See SUB Adj_flat in the example program to see how step 3 is performed in
Agilent BASIC.
Example Program
An example program that performs the AC flatness adjustment procedures
for both filters is listed following the AC flatness adjustment procedure for
the 10 MHz filter.
Agilent E1445A Service Manual Adjustments 93