Termination Impedance Test - HP 4935A Operating And Service Manual

Model 4935A

4-20. Termination Impedance Test

HP 3490A Multimeter
1
Resistors - 90011, 60012, 13511
1.
2 . Connect equipment as shown in Figure 4-8.
On 4935A select:
POWER
NOR
SET UP
Measure the resistance across the transmitter and receiver jacks. Both should be greater than 1M
4 .
ohm.
a . As the DC blocking capacitors charge, the measured resistance may slowly rise. Set the
Multimeter to the lowest resistance and increase the resistance as the meter overranges.
Set up 4935A as follows:
5 .
POWER
DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PERFORMANCE TESTS
M O D E L
3 1 0 T O B N C
BNC TO DUAL BANANA
Figure 4-8. Termination Impedance Test
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4 9 3 5 A
TEST RESISTOR
. . . .
. press in simultaneously
. . . . . . . . . . . . . . . . . BRG out
press in RCV 9000
press in TRMT 90011
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... LEVEL FREQUENCY
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Performance Tests
STBY
DIAL out
Both HOLD out
S
ON
RCV
adjust to 0.0 dBm
4-17