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8. LO Distribution Amplifier Adjustment
15. On
the HP 85623, press
LCAL),
MORE
I
OF
2, SERVICE CAL DATA, LO LEVELS,
and
INT
LO
LEVEL.
The message
DRIVE FOR
BAND#
1
will be displayed.
16. Note the
“Bl
INT Sense” voltage printed on the A7 LO distribution amp label. Use the
knob or keypad, and press enter, to change the displayed DAC value so the DVM reading
is 6
mV
more negative than the label voltage. For example, if the
“Bl
INT Sense” voltage
is -170
mV,
change the displayed DAC value so the DVM reading is -176 mV.
17. Record the DAC value:
DAC value for 4.60
GHz
=
18. To set the band 2 sense voltage, set the HP 85623 center frequency to 9.46 GHz.
19.
On the HP 85623, press
(CAL),
MDRE
I
OF 2, SERVICE CAL DATA,
LO LEVELS, and
INT LO LEVEL.
The message
DRIVE FOR
BAND#
2
will be displayed.
20. Note the “B2 INT Sense” voltage printed on the A7 LO distribution amp label. Use the
knob or keypad, and press enter, to change the displayed DAC value so the DVM reading
is 6
mV
more negative than the label voltage. For example, if the “B2 INT Sense” voltage
is
-
170
mV,
change the displayed DAC value so the DVM reading is
-
176 mV.
21. Set the “Sense EXT” value by pressing EXT
LO
LEVEL .
22. Use the knob or keypad to enter the DAC value for 1.45 GHz from the band 0 sense
voltage adjustment above.
23. Save the adjustment values by pressing
PREtV
MENU, STORE DATA, and YES.
24. Move the jumper on A2J12 from WR ENA back to the WR PROT position.
2-42 Adjustment Procedures