HP 8340B Manual page 34

4-5.
MAXIMUM LEVELED OUTPUT POWER AND POWER ACCURACY
TEST (Cont'd)
HP 8340B/41B
UNDER TEST
OSCILLOSCOPE
Figure 4-5.
Maximum
Leveled Output Power and Power Accuracy Test Setup
Procedure
MAXIMUM LEVELED POWER
1.
Connect the equipment as shown
in
Figure
4-5. Connect the
10 dB pad and crystal detector to the
DUT RF output and connect the detector output
to the oscilloscope channel
A input. Allow the
equipment to warm up
for
one hour.
2.
Press
[INSTR PRESET].
Press
[PEAK]
on. Press
[STOP FREQUENCY]
and enter
[2] [.] [3]
[GHz].
Adjust the oscilloscope to view the swept output of the crystal
detector.
In Band
0
(10
MHz to 2.3 GHz), the crystal detector may pass
a
portion of the
RF
signal. This
RF
feedthrough may be visible on
the low frequency
portion of
the oscilloscope trace.
Also, as
the power in Band
0 is
increased toward
maximum leveled, the level of the harmonics
may increase and cause
a
perturbation
in
the swept response. This will cause the maximum
power
indication on the
oscilloscope to increase without
causing the UN LEVELED
indicator to
light. Therefore, flatness is
only specified at
^
+10
dBm in Band 0.
3.
Press the [POWER LEVEL]
key and, using
the front
panel rotary knob, increase the power
level
until the
UNLEVELED
Indicator
comes
on. Slowly
decrease the power level until the
UNLEVELED
indicator Just goes off. Note the ENTRY DISPLAY power
indication.
Performance Tests
HP 8340B/41B