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AC Flatness Adjustment Procedure - 10 MHz Filter
Description
This procedure adjusts the AC calibration constants for the 10 MHz filter.
The AC Flatness Test for the 10 MHz 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).
• Follow the manufacturer’s instructions for calibrating the Power
Meter and correcting for the Power Sensor.
• Determine the calibration constants by performing Test 2-6 (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 <security 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. If the firmware revision is A.02.00 or higher (use the *IDN?
command to determine the firmware revision), transfer the two
constants (4 and 25000) that determine the frequencies to be
calibrated:
CAL:DATA:FILT <data>
NOTE
See SUB Load_magic_num in the example program to see how step 3 is
performed in Agilent BASIC.
94 Adjustments Agilent E1445A Service Manual