HP 8447D Operation And Service Manual page 20

Page 16
Model 8447D/E/F
PERFORMANCE TESTS
57. Distortion and Reverse Isolation (Cont.)
HP 141T/8552A/8555A
HP 8620A/8621A
Cir-Q-Tel FLT/2 Series
.... HP 10503A
.... UG-201A/U
. . . HP 8491B-10
.... UG-349A/U
.... HP 11500A
Equipment:
Spectrum Analyzer . .
Sweep Oscillator . . .
400 MHz Low Pass Filter
Cable Assembly . . .
Adapter ......
10 dB Attenuator . .
Adapter.
Cable Assembly . . .
SPECTRUM ANALYZER
Figure
7.
Distortion and Reverse Isolation Test Setup
Procedure:
1. To check distortion, connect the equipment as shown in Figure 7. Set the sweep oscillator for a
fixed, 400 MHz CW signal.
2. Set the spectrum analyzer's input attenuator as shown below; adjust the controls to display
400 through 1200 MHz.
NOTE
The signal into the analyzer's input mixer must be low enough to eliminate
harmonic distortion in the analyzer.
3. Set the sweep oscillator's output level for the following signal levels out of the amplifier (read
on the analyzer).
Signal Level
Analyzer Input Atten.
8447E: +10 dBm 50 dB
8447F POWER AMP: +10 dBm 50 dB
4. Note the level of the second harmonic (at 800 MHz) and the third harmonic (at 1200 MHz).
The harmonic signal levels should be >30 dB below the fundamental:
Harmonic Distortion, 30 dB down: 30 dB__