HP 8340B Manual page 294

5-15.
ALC ADJUSTMENTS (Cont'd)
Table 5-8. High Band
ALC
Adjustment
OUT Power Level
-20
dBm
-10dBm
OdBm
10dBm
18
dBm
•
Access Calibration Constant Number 47 by entering the following
(SHIFT]
[GHz]
[4] [7] [Hi] [SHIFT] [MHz] [1] [2] (Hz]
[SHIFT]
[kHz] [2]
[2] [Hz] Use [STEP]
key to
change Cal Constant Number
to
44
Associated Adjustment
A25R34 (H-20)
Calibration Constant
#47*
Calibration Constant
#44*
A25R39(H+10)
A25R24
(+20)
Check Limit
0.3 dB
0.1
dB
0.1
dB
0.1
dB
0.2 dB
Adjustment Limit
0.2
dB
0.02 dB
0.02 dB
0.02 dB
0.05 dB
17.
If all
power meter indications are within the test
limits,
check at
power
levels from —20 dBm to
+20
dBm
in 5 dB steps.
18. Press
[CW]
and enter
[1] [.] [5] [GHz].
Press
[SHIFT] [PWR SWP]
to
decouple the RF attenuator
and ALC. Enter
[0] [dBm].
Press
[SHIFT] [METER]
and enter[-]
[1] [0] [0] [dBm]. Dashes
should be displayed
in the
POWER
dBm display.
If
not,
rotate the RPG counter-clockwise
until the
dashes appear
(note that the UNLEVELED annunciator will be on at this time).
Zero
the power
meter
in
"WATT" mode
as described in step
15.
The low band (Band
0) contains broadband noise.
If
the
power meter
is
properly zeroed,
the broadband noise will be
compensated
and
power
measurements
will
be more accurate. Press [1NT] (UNLEVELED annunciator off) and then
[SHIFT] [PWR SWP]
(attenuator and
ALC
should both indicate
zero).
19.
Refer to Table 5-9
below, enter
the
appropriate
DUT power
level
(ALC
level) and
check the power
meter indication.
Check the
indication at each
power
level and note the
amount
of error before
making any adjustments.
If
necessary adjust the appropriate controls shown in
the table
to adjust
the
power
level to be within the test
limits.
Adjustments are iterative.
Adjust in the following order:
0
dBm,
—10 dBm, —20 dBm, —10 dBm,
0
dBm, and
+10
dBm.
When
selecting
a new power level, press
[SHIFT] [PWR SWP] [desired power level] [dBm].
Table 5-9.
Low
Band ALC Adjustment
DUT Power Level
-20
dBm
-10dBm
OdBm
10dBm
There
is
no low band
+20
dBm
adjustment.
•
Access Calibration Constant Number
46
by entering the following [SHIFT]
[GHz]
[4] [6]
[Hz]
[SHIFT]
[MHz] [(]
[2] [Hz] [SHIFT]
[kHz]
[2] [2] [Hz]
Associated Adjustment
A25R33 (L-20)
Calibration Constant
#46*
A25R108(LOFS)
A25R38(L+10)
Check Limit
0.3 dB
0.1
dB
0.1
dB
0.1
dB
Adjustment Limit
0.2
dB
0.02 dB
0.02
dB
0.02
dB
HP 8340B/41B
Adjustments