HP 8340B Manual page 36

4-5.
MAXIMUM
LEVELED OUTPUT POWER AND POWER ACCURACY
TEST (Cont'd)
If
the
ALC accuracy
is
tested, frequency response must be considered; therefore, use the
0
dBm
power meter indication
as a reference.
Also
it
should be noted that the
power
level in the
ENTRY DISPLAY
is the requested
power
level.
In
normal ALC modes, the instrument
processor duplicates the
ENTRY DISPLAY power
level in
the
POWER
dBm display with
0.1
dB
resolution; however,
if AM
is selected, the processor reads
the ALC
level with the
A/D
converter, calculates the associated power
level, and displays the
calculated value in the
POWER dBm
display.
10. Press
[INSTR PRESET].
Press
[PEAK]
on.
Press[STOP FREQUENCY]
and
enter [2] [.] [3] [GHz].
Press [POWER LEVEL] and enter [0] [dBm].
11.
Press the [SWEEP TIME]
key and enter
[2] [sec].
12.
Adjust the oscilloscope controls to view
the Power
Meter RECORDER OUTPUT voltage versus
the DUT's SWEEP OUTPUT
voltage (A versus
B). The oscilloscope
vertical gain and position
must
be changed as
a
function
of the power meter range and RECORDER OUTPUT
voltage.
13. Press
Frequency Marker key
[M2]
and, using the rotary knob, change
the
marker frequency to
position the (intensified)
marker on
the lowest point on the oscilloscope trace.
It
may be necessary
to adjust the oscilloscope INTENSITY
to
view
the marker dot.
14.
Note the
marker frequency. Press
the
[MANUAL]
key and enter the frequency noted for M2.
Reset the power meter calibration factor switch to include this
frequency.
The power
meter
indication is the minium power
point. Record the power
meter
indication on the work sheet
pro¬
vided in Table
4-10.
NOTE
For Band
0
(10
MHz
to 2.3 GHz),
if
the minimum or maximum power
occurred below 50 MHz, use the HP 8481A
Power Sensor to
measure
the
power level.
15. Press the
[CONT]
key to return to the
sweep mode. Press
[M1] and, using the rotary knob, change
the
marker frequency
to position the marker on the highest point on the oscilloscope trace, Note
the marker frequency. Press the
[MANUAL]
key and
enter the frequency noted for
M1.
Reset the
power meter calibration factor switch to include this
frequency.
The power meter
indication
is the
maximum power
point.
Record the power meter indication on the
work
sheet.
16.
Press the
[CONT]
key to return to the swept mode. Press the
(START
FREQ]
key and
enter the
start frequency for the next frequency band. Press the [STOP
FREQ] key and
enter the stop
frequency
for the next
frequency band.
17.
Repeat steps
12
through
16
to
measure the
flatness
until all
frequency bands have been checked.
18.
The
maximum minus the minimum power meter
indications should be within the flatness
specifi¬
cations.
If
the
DUT
does not meet
its flatness specification, refer to Flatness Adjustments
in
Section
V
of the Service
Manual.
ACCURACY
19.
The
absolute power level at the maximum and minimum
points should be within the accuracy
specification. This test may be repeated at other ALC power levels (+10 dBm to —9.95 dBm)
to
verify flatness and accuracy specifications
over
the
ALC
range.
4-30
Performance Tests
HP 8340B/41B