HP 8447D - Gain Flatness, Mean Gain, and Gain Compression Test

DRAFT 19
Operation and Service Manual
Performance Tests Procedures
Gain Flatness, Mean Gain, and Gain Compression Test
Specifications:
Description:
Amplifier gain is measured at the maximum and minimum points of its frequency
response. See Figure 1 and Figure 2. The difference between highest measured
gain and lowest measured gain should be less than 3 dB (gain flatness). Half of the
sum of the highest gain and lowest gain is the measured mean gain and should be
within 2.0 dB of the specified gain. Compression is checked by measuring gain at
the specified 1 dB compression point and comparing it to gain measured below
compression.
Equipment:
Generator/sweeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8601A
Sweep oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8620A/8621A
RMS voltmeter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3400A
Power meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 432A/478A
BNC cable assembly (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A
BNC tee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UP-247B/U
50 Ω termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 11593A
Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .UG-349A/U
Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .UG-201A/U
Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 1250-0080
20 dB attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP 8491B-20
10 dB attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP 8491B-10
HP 8447D
Preamp
HP 8447E
Power amp
HP 8447F
Preamp Power
Amp
HP 8447F H64
Preamp Low Freq
Preamp
Gain flatness across
full frequency
range
±1.5 dB ±1.5 dB ±1.5 dB ±1.5 dB ±1.5 dB ±2 dB
Mean Gain
(20°C-30°C)
25 dB min. 22 dB ±2.0
dB
25 dB min. 22 dB ±2.0
dB
25 dB min. 26 dB min.
Output power for 1
dB gain compres-
sion
−− >+12.5 dBm −− >+12.5 dBm −− >+15 dBm