HP 70427A User Manual page 603

Adjustments
Lo Amplifier Bias Adjustments
Figure 15-3 YIG Tuned Filter Driver Assembly
6. Adjust each of the 6 stages of the LO Amplifiers as follows: Press the
VOLT-METER
each LO Amp Stage to be adjusted. Adjust the Pot listed, for the
corresponding voltage shown in the VOLT column for each LO Amp
Stage. As the Pot is adjusted it will be necessary to repeatedly press
UPDATE DISPLAY
reading represents amplifier bias current in mA.
Table 15-1 Bias Current in MA
LO Amp Stage
6th
5th
4th
3rd
2nd
1st
15-6 HP 70427A/HP 70428A User's Guide
key followed by the Key Sequence in the table below for
to update the VOLT field of the display. The VOLT
Key Sequence Pot
12 ENTER R24
4 ENTER R27
8 ENTER R29
0 ENTER R34
14 ENTER R32
6 ENTER R33
VOLT:
150
150
100
100
100
100