30 DRAFT
Operation and Service Manual
Performance Tests Procedures
The harmonic signal levels should be >30 dB below the fundamental.
For the HP 8447F option H64 low frequency preamp, note the level of the second har-
monic at 20 MHz and the third harmonic at 30 MHz. The harmonic signal levels
should be >35 dB below the fundamental.
5 To check reverse isolation, disconnect the oscillator and the spectrum analyzer from the
amplifier, reduce the oscillator’s output level, then connect the oscillator to the spec-
trum analyzer.
6 Set the oscillator output level for a 0 dBm signal as read on the spectrum analyzer. Con-
nect the spectrum analyzer to the amplifier INPUT. Connect the oscillator to the ampli-
fier OUTPUT.
7 Read the level of feed-through directly on the spectrum analyzer. It should be below −
40 dBm:
Noise Figure Test Procedure
Specifications:
Noise Figure: <8.5 dB (for the HP 8447D and HP 8447F preamp)
Characteristics
Noise Figure: <7.0 dB (for the HP 8447F option H64 low frequency preamp)
Description:
Noise figure is checked at 100 MHz by inserting a known amount of excess noise
into the amplifier under test. The known noise is then compared to the amplifier’s
noise level with a noise figure meter. Noise is checked at 200 MHz using a
1300MHz signal source and a mixer to convert the noise to 100 MHz. Then it is
measured with the meter.
Equipment:
Noise figure meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 342A
VHF noise source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 343A
UHF noise source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 349A
Sweep oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8620A/8621A
Double balanced mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SL 2513/2523
Harmonic Distortion, 30 dB down: _____________
HP 8447F H64 Harmonic Distortion, 35 dB down: _____________
Reverse isolation, >40 dB down: ________________
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