Chapter 2 109
Adjustment Procedures
14. External Mixer Bias Adjustment
Procedure
1. Press LINE to turn the spectrum analyzer off and disconnect the ac
power cord. Remove the spectrum analyzer cover and connect the
equipment as illustrated in Figure 2-20 on page 108. Reconnect the
power cord and press
LINE to turn the spectrum analyzer on.
2. Set the HP 3456A controls as follows:
Function....................................................................DCVOLTS
Range ..................................................................................0.1V
Resolution ........... ..........................................................100mV
3. On the HP 8560E/EC, press
AUX CTRL, EXTERNAL MIXER, BIAS, then
BIAS OFF.
4. Adjust A15R926 EXT BIAS ZERO for a DVM reading of 0.000 Vdc
±12.5 mV.
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