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Skew DAC Adjustment Procedure (cont’d)
Adjustment Procedure (cont’d)
2. Set up the AFG to output an 11 dBm, 4 MHz sinewave:
FUNC SIN;
:VOLT 11 DBM;
:FREQ 4E6
INIT:IMM
3.
Load an initial value of 128 into the delay DAC:
DIAG:POKE #HE0000B,8,2
DIAG:POKE #HE0000D,8,128
DIAG:POKE #HE0000B,8,7
DIAG:POKE #HE0000D,8,8
4.
With the Spectrum Analyzer, locate and center the second harmonic.
Then, reduce the frequency span to 2 kHz.
5. Find the delay DAC setting that minimizes the amplitude of the
second harmonic (see the example program).
6. 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").
7. Transfer the calibration constant (DAC setting) to the AFG in
arbitrary block data format:
CAL:DATA:SKEW <data > Transfer cal constant
NOTE
See the example program to see how step 7 is performed in BASIC.
8. Enable calibration security on the AFG:
CAL:SEC:STAT ON Cal security on
110 Adjustments Agilent E1445A Service Manual