HP 8447D Operation And Service Manual page 19

Model 8447D/E/F Page 15
PERFORMANCE TESTS
56. VSWR (Cont.)
9. Set TEST CHANNEL GAIN 10 dB above the reference in step 7. The center horizontal graticule
line now represents a return loss of 10 dB. The measured return loss should be as shown below:
INPUT VSWR, 110 to 220 MHz:
8447D, >9.6 dB: 9.6 dB___ 8447F PRE AMP, >9.6 dB: 9.6 dB_....--—
8447E, >8.8 dB: 8.8 dB„_ 8447F POWER AMP, >8.8 dB: 8.8 dB_..._
10. Repeat steps 8 and 9, measuring return loss at amplifier OUTPUT (terminate amplifier INPUT
with 50 ohms). The measured return loss should be greater than 8.8 dB:
OUTPUT VSWR, 110 to 220 MHz: 8.8 dB ______
11. Set the sweep oscillator to sweep each of the ranges shown below, repeating steps 7 through 10
for each range.
Sweep Range
Reference:
TEST CHAN.
GAIN
8447D INPUT,
8447F PRE
AMP INPUT
8447E INPUT,
8447F POWER
AMP INPUT
OUTPUT
220 to 440 MHz
dB
9.6 dB
8.8 dB
8.8 dB
440 to 880 MHz
dB
9.6 dB 8.8 dB
8.8 dB
880 to 1300 MHz
dB
9.6 dB 8.8 dB 8.8 dB
-----
57. Distortion and Reverse Isolation
Specifications:
8447D
PRE AMP
8447E
POWER AMP
8447F
PRE AMP POWER AMP
Harmonic
Distortion
—30 dB for
+10 dBm output
-30 dB for
+10 dBm output
Reverse
Isolation
>40 dB >40 dB
> 40 dB >40 dB
Description:
A fixed, CW signal at 400 MHz is filtered and applied to amplifier INPUT. Amplifier OUTPUT is
connected to a spectrum analyzer, and the analyzer is used to check the second and third harmonic
levels. Reverse isolation is checked by applying a known signal level to amplifier OUTPUT and mea¬
suring it at amplifier INPUT.