HP 8340B Manual page 297

5-15.
ALC ADJUSTMENTS (Cont'd)
ADJUST AM OFFSET
27. Connect
the Power Sensor to the
DUT's RF OUTPUT.
Press
[INSTR PRESET]. Press [CW] and
enter
[1] [GHz], The
power
level should be 0 dBm. Disconnect any AM
inputs.
Access Calibration
Constant Number 43 by entering the following: [SHIFT] [GHz] [4] [3] [Hz] [SHIFT] [MHz] [1] [2]
[Hz] [SHIFT] [kHz] [2] [2] [Hz]. Adjust Calibration Constant Number 43
for no
more than 0.05
dB
change in
power meter
indication
when turning AM on then
off.
AM GAIN ADJUSTMENT
28. Set up the following equipment as shown in
Figure 5-50 with the power supply
set to
0
Vdc. Allow
the equipment to warm
up
for at least
30
minutes.
OUT POWER METER
0
b-
@
I
a
V
a
,ADAPTER
'APC-S.Sd)
to N(m)
BNC TEE
Figure 5-50.
AM GAIN
Adjustment Test Setup
29. Calibrate the
power meter
and then set the calibration factor switch for
a 1.5
GHz measurement.
Connect the
power sensor
to the
DUT's RF
output.
30. Press the following key
sequence
on the DUT:
[INSTR PRESET]
[CW] [1] [.] [5] [GHz]
[POWER LEVEL]
[-]
[5] [dBm]
[AM].
31. Adjust the power
supply for
0 Vdc. Press dB [REF]
on the
power meter
(the
power meter
will
now
indicate the power
level changes from
this
reference).
Adjustments
HP 8340B/41B