HP 8648 A/B/C/D - Changpuak.ch

Pulse Modulation
On/Off Ratio
Performance Ykst
(Option lE6 Only)
Connect the Test
Equipment
Configure the
Spectrum Analyzer
Configure the HP 8648
Measure the On/Off
Ratio
6.26 Performance Tests
Test Record
SPECTRUM
ANALYZERL10 MHz Fief
10 MHz RefLHP
8648
output UNDER TEST
I
a :=:B
8Ei:”
is33888
ifBE!Sa
* PfmEPS. B
I
I Input
5oc2 I
RF Output
Figure S-18. Pulse Modulation On/Off Ratio Equipment Setup.
1. Resolution BW 10 kHz
2. Video BW 1 MHz
3. Frequency span 0 Hz
4. Reference level 0 dBm
5. Scale 10 dB/div
6. Video trigger
1. Turn the RF output on; press [m).
2. Set the amplitude; press [mj’ (??J []Bo).
3. Activate pulse modulation display; press IAhn) IAM_).
4. Turn pulse modulation on; press ~MOD ON/OFF).
1. Set the frequencies of the spectrum analyzer and HP 8648 to those
listed in the test record. For each frequency measure the change in
amplitude as the RF is pulsed on and off. (Press [MOD ON/OFF]).
2. Record the text results and compare the results to the limits in the
test record.
HP 8648B . ............................................... Table 8-42
HP 8648C . ............................................... Table 8-67
HP 8648D . . ............................................... Table 8-92