HP 8340B Manual page 32

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 [INSTRPRESET]. Press [PEAK]on. Press[STOP FREQUENCY] and enter [2]
Press [POWERLEVEL] and enter [0] [dBm].
11. Press the [SWEEPTIME] 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.
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
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 Ml. 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 [STOPFREQ] 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 —9.9S dBm) to
verify flatness and accuracy specifications over the ALC range.
4-30 Performance Tests
NOTE
[Ml] and, using the rotary knob, change
[3] [GHz].
[.]
HP 8340B/41B