HP 8559A ALTIF, First LO Adjustments, 5-25.FIRST CONVERTER ADJUSTMENTS(Cont'd)

MODEL8559A ADJUSTMENTS

ADJUSTMENTS

5-25. FIRST CONVERTER ADJUSTMENTS(Cont'd)First LO Adjustments

2.Connect DVM to A7TP6 TUNE.

3.Set spectrum analyzer controls as follows:

INPUT ATTEN ..............................................................	0 dB
FREQ SPAN/DIV ...............................................................	0
ALTIF .....................................................................	OFF

4.Connect frequency counter to spectrum analyzer RF Input.

5.Jumper A16TPl DIODE BIAS to ground. A16TP1 is located on the motherboard through a hole in the analyzer left side gusset.

6.Adjust front-panel TUNING control for DVM indication of 0.000 Vdc (fully counterclockwise).

7.Adjust A7R8 (3 GHz) for frequencycounter indication of 3.000 GHz +1 MHz. (If this adjustment cannot be achieved, factory select resistor A7R3* can be added-if it is not installed -or decreased to provide the proper range. Select a value of 147K ohms for A7R3*, initially, and decrease this value to no less than 56.2K ohms.)

8.Adjust front-panelTUNING control for DVM indication of - 10.000Vdc.

9.Set A7R756 GHz F (fine) to approximately mid-range (R75 is a 20-turn potentiometer).

10.Adjust A7R476 GHz C (coarse) for a frequencycounter indication of 6.000 GHz + 2 MHz.

11.Retune front-panel TUNING control for 0.000 Vdc DVM indication and readjust A7R8 3 GHz if neces- sary for frequencycounter indication of 3.000 GHz *1 MHz.

12.T h e front-panelTUNING control for - 10.000Vdc DVM indication.

13.Lightly tap the top edge of the A7 Frequency Control board with the handle of a small screwdriver to seat controls.

14.Adjust A7R756 GHz F (fine) for frequencycounter indication of 6.000 GHz *1 MHz.