22
DRAFT
Operation and Service Manual
Performance Tests Procedures
For HP 8447F H64 low frequency preamp, replace the generator/sweeper shown in
Figure 4 with HP 3335A synthesizer (or equivalent). Set the synthesizer for a 9 kHz,
CW signal. Repeat step 7. Measure, calculate and record the amplifier gain at 9 kHz.
9
Select the highest and lowest gains from steps 2, 4, 5, 7, and 8. Subtract the lowest gain
from the highest gain. The result is gain flatness and should be less than 3 dB.
Example:
23 dB (highest gain) minus 21.5 dB (lowest gain) = 1.5 dB (gain flatness)
For HP 8447F H64 low frequency preamp, select the highest and lowest gains from
steps 7, and 8. Subtract the lowest gain from the highest gain. The result is gain flat-
ness and should be less than 4 dB (
±
2 dB). Add the highest and lowest gains together
and divide by 2. The result is measured gain.
10
Add the highest and lowest gains together and divide by 2. The result is the measured
mean gain.
Example:
Frequency
Gain
250
±
100 kHz (tune for maximum):
_______________dB
100 kHz:
_______________dB
HP 8447F H64 Frequency
Gain
9 kHz:
_______________dB
Gain flatness:__________________dB
Measured gain:__________________dB
23 dB (highest gain)
21.5 dB (lowest gain)
+
2
------------------------------------------------------------------------------------------------------------
22.25 dB (mean gain)
=
