Agilent Technologies 75000 Series C, E1445A Adjustment Procedure (contd), 110 Adjustments Agilent E1445A Ser vice Manual

Skew DAC Adjustment Procedure (cont’d)
Adjustment Procedure (cont’d)
2. Set up the AFG to ou t put 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 (fa ctory-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 o n the AFG:
CAL:SEC:STAT ON Cal security on
110 Adjustments Agilent E1445A Ser vice Manual