HP 8447D Operation And Service Manual page 25

NOTE:
Mean Gain
HP 8447D
HP 8447E
HP 8447F preamp
HP 8447F power amp
Gain rolls off rapidly above 1300 MHz and below 0.1 MHz. If the lowest gain was
measured at either of these points, use a frequency counter to monitor the signal and repeat
steps 1 through 10.
11 To check compression, connect the power meter mount, through the 10 dB attenuator,
to the amplifier OUTPUT as shown in Figure 3. Connect the sweep oscillator, through
the 20 dB attenuator, to the amplifier INPUT. Set the sweep oscillator for a leveled, 650
MHz, CW signal and set the signal level (read on the power meter) as follows:
(For the HP 8447F H64 low frequency preamp set the 3335A to 10 MHz)
HP 8447E:
HP 8447F power amp:
12 Without changing any of the sweep oscillator settings, move the 10 dB attenuator from
the amplifier OUTPUT to the amplifier INPUT. The power meter should now be con-
nected directly to the amplifier OUTPUT and the sweep oscillator should be connected
through the 20 dB attenuator and the 10 dB attenuator to the amplifier
INPUT.
13 The power meter should read as follows:
HP 8447E
HP 8447F power amp
HP 8447F H64 low fre-
quency preamp
14 Repeat steps 11 through 13 at various frequencies between 0.1 and 1300 MHz.
For the HP 8447F H64 low frequency preamp repeat steps 11 through 13 at various
frequencies between 0.1 to 50 MHz.
DRAFT
Operation and Service Manual
Performance Tests Procedures
Min
25 dB
20 dB
25 dB
20 dB
+ +
2.5 dBm (
+ +
2.5 dBm (
+
less than 3.5 dBm:
+
less than 3.5 dBm:
+
less than 6 dBm:
Actual Max
________
________ 24 dB
________
________ 24 dB
11.5 dBm ampl. output)
11.5 dBm ampl. output)
_____________dBm
_____________dBm
_____________dBm
23