HP 8447D Operation And Service Manual page 22

Page 18
Model 8447D/E/F
PERFORMANCE TESTS
58. Noise Figure (Cont.)
NOISE FIGURE METER
SWEEP OSCILLATOR
j OUT
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Figure 9. Noise Figure Test Setup: 1200 MHz
Procedure:
1. Connect the equipment as shown in Figure 8. Calibrate the noise figure meter. Check the amplifier's
noise figure at 100 MHz (or 105 MHz); it should be less than 8.5 dB:
100 MHz: _____8.5 dB
2. Connect the equipment as shown in Figure 9. Set the sweep oscillator for a fixed, CW signal at
1300 MHz; set the signal level out of the oscillator for +10 dBm read on the power meter.
3. Disconnect the power meter firora the oscillator and connect the oscillator to the mixer.
4. Set the noise figure meter to measure noise at 100 MHz; calibrate the meter.
NOTE
If the noise figure meter being used has a 105 MHz input frequency, set the
sweep oscillator (in step 2) to 1305 MHz.
5. Check the amplifier's noise figure; it should be less than 8.5 dB:
1200 MHz:
8.5 dB