HP 4935A, Руководство по эксплуатации и обслуживанию

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Model
Performance Tests
PERFORMANCE TESTS
4-20. Termination Impedance Test
M O D E L 4 9 3 5 A
3 1 0 T O B N C
BNC TO DUAL BANANA
TEST RESISTOR
or
Figure 4-8. Termination Impedance Test
HP 3490A Multimeter
to BNC adapter
1
to dual banana adaptor
Resistors 13511
1.
2.
4935A from AC power.
Connect equipment as shown in Figure 4-8.
On select:
POWER . . . . . . . . . .
NOR
. . . . . . . . . . . . . . . . . . .
SET UP . . . . . . . . . . . . . . . . .
STBY
. press in simultaneously
. . . . . . . . . . . . . . . . . BRG out
DIAL out
Both HOLD
S
out
press in RCV
press in TRMT
4 .
Measure the resistance across the transmitter and receiver jacks. Both should be greater than
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.
5 .
Set up 4935A as follows:
POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
LEVEL . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
ON
. . . . . . . . . . . . . . . . . . . . . RCV
... LEVEL FREQUENCY
. . . . . . . . adjust to 0.0
4-17