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HP 8481 A/82 A/83 A
08481-90049
r
l
Table 4, SWR and Reflection Coefficient
Frequency
System SWR Uncertainty
Actual
Measurement
Maximum SWR
(Reflection Coefficient)
HP 8481A
r1
—.
.
10 to 30 MHz
±0.030
< 1.40 (0.166)
30 to 50 MHz
±0.020
< 1.18 (0.083)
50 MHz to 2 GHz
±0.020
< 1-10 (0.048)
2 to 12.4 GHz
±0.020
< 1.18 (0.083)
12.4 to 18 GHz
±0.025
< 1.28 (0.123)
HP 8482A
100 kHz to 300 kHz
±0.08
< 1.60 (0.231)
300 kHz to 1 MHz
±0.04
< 1.20 (0.091)
1 MHz to 2 GHz
±0.02
< 1.10 (0.048)
2 to 4.2 GHz
±0.02
< 1.30 (0.130)
HP 8483A
100 kHz to 600 kHz
±0.08
< 1.80 (0.286)
600 kHz to 2 GHz
±0.02
< 1.18 (0.083)
FET Balance
Adjustment
The FET balance adjustment should be performed if the wires
connecting Jl to the A2 printed circuit have been moved. If you have
replaced A2 or moved the wires during troubleshooting you will need to
perform this adjustment. You do not need to perform a FET balance
adjustment after an Al bulkhead assembly replacement if the wires
between J1 and A2 have not been disturbed.
Warning
dK
The following procedure exposes high voltage areas within the power
■*
meter. Use extreme care while working around these areas or personal
injury could occur.
Equipment
Oscilloscope. HP 54200A
Power Meter .. HP 435B
Mui|%ter. HP 347SA
The sampling gate balance is affected by the relative positions of the
wires in the Power Sensor, which connect to pins G and H of connector
Jl. One wire is black and white; and the other is brown and white.
Moving the black and white wire will adjust the switching transient
amplitude (spike). Moving the brown and white will change the offset.
Once positioned, care must be used not to displace these wires. To
correctly position these wires, after replacement of the printed circuit
7
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