HP 8340B Manual page 223

5-17. RF OUTPUT POWER FLATNESS ADJUSTMENT (Cont'd)
10. Set the oscilloscope's PERSISTENCE to minimum. On the OUT, press [MANUAL] [2]
[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 OUT, press [SHIFT][GHz][4] [4] [Hz] [SHIFT][ENTRYOFF]
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
zero and calibrate the power meter.
13. On the OUT, press [INSTR PRESET] [STARTFREQI [1] [ 0] [MHz] [STOPFREQI [2]
[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.
Connect the power sensor to the OUT's
14.
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 dBin MODE on the power meter.
15. Press [RF] on the OUT 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]
2.4 GHz CAL FACTOR indication on the power sensor. Note the
power level will be P4 in the following equation.
Calculate the value of P using the following equation:
P
(1.044 X P3)
=
5-118 Adjustments
£25
Figure 5-63. Flatness Adjustment Location
output and then press [RF] on the
RF
on
[4] [GHz] the OUT. Set the power
[.]
(0.044 X P4)
—
Ri08
to access
minutes for the sensor to stabilize and then
15
meter's
CAL FACTOR %
power meter indication.
[.] [4]
Cal Constant 44.
[GHz]
[.] [4]
to turn
the RF
OUT
dial for the
This
HP 8340B/41B