Step Gain And 18.4 Mhz Local Oscillator Adjustments - HP 8566B Adjustment Manual

IF-Display Section
Resolution Bandwidth Selectivity Test
IF Gain Uncertainty Test
Center Frequency Readout Accuracy Test
First, the IF signal from the RF Section is measured with a power
meter and adjusted for proper level. Next, the 10 dB gain steps are
adjusted by connecting the CAL OUTPUT signal through two step
attenuators to the RF INPUT and keying in the REFERENCE LEVEL
necessary to activate each of the gain steps, while compensating for
the increased gain with the step attenuators. The 1 dB gain steps
are checked in the same fashion as the 10 dB gain steps, and then
the variable gain is adjusted. The 18.4 MHz oscillator frequency is
adjusted to provide adequate adjustment range of front-panel FREQ
ZERO control; and last, the + 1OV temperature compensation supply
used by the A4A4 Bandwidth Filter and A4A8 Attenuator-Bandwidth
Filter is checked and adjusted if necessary.
Step Gain and 18.4 MHz Local Oscillator Adjustments Setup
Figure 3-46.