HP 8340B Manual page 316

5-17.
RF
OUTPUT POWER FLATNESS ADJUSTMENT (Cont'd)
A25
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Figure 5-63. Flatness Adjustment Location
10.
Set the oscilloscope's PERSISTENCE
to minimum. On the
DUT, press [MANUAL] [2] [.] [4]
[GHz]
and [SLOPE] to turn the slope off. Adjust the CAL FACTOR %
dial on the power meter for
the 2.4
GHz CAL FACTOR
indication on the
power sensor.
11.
On the
DUT,
press
[SHIFT] [GHz] [4] [4] [Hz] [SHIFT] [ENTRY OFF] to
access
Cal
Constant 44.
On the
power meter, press
RANGE HOLD
to turn
it
off.
Adjust Cal Constant 44
for
a
0
dBm
indication on the power meter.
12.
Turn the
power meter
off
and disconnect the HP 8485A power sensor. Connect the HP 8481A
power sensor
and
turn
the power meter on. Allow 15 minutes
for the sensor to stabilize and then
zero
and calibrate the power meter.
13.
On the DUT. press
[INSTR PRESET] [START
FREQ] [1] [0] [MHz] [STOP FREQ] [2] [.] [4] [GHz]
[MANUAL] [1] [0] [0] [MHz] [POWER LEVEL] [0] [dBm].
Set the power meter's CAL FACTOR %
dial
for the 100 MHz CAL FACTOR
indication on the
power sensor.
14.
Connect the
power
sensor to the
DUT's
RF output and then press [RF]
on the
DUT to turn the RF
off.
Zero the power meter. To ensure that the
power meter
is properly zeroed, select
WATT
mode,
and press the
ZERO
button until the power meter
indicates <
0.02 on the most
sensitive range.
Select the dBm
MODE
on the power meter.
15. Press
[RF]
on the
DUT to
turn the
RF
on. Allow
a
few seconds for the power meter to stabilize and
then note the
power meter
indication. This power level will
be P3
in
the following equation.
16.
Press
[MANUAL] [2] [.] [4] [GHz]
on the
DUT.
Set the
power meter's CAL FACTOR
% dial
for the
2.4 GHz CAL FACTOR
indication on the power sensor. Note the power meter indication. This
power
level will be P4
in
the following equation.
Calculate the value of P
using the following equation:
P
=
(1.044
X P3)
-
(0.044
X
P4)
Adjustments
HP 8340B/41B
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