Connector Pin - HP 85020 A Operating And Service Manual

Service
Model
85020A/B
Table 8-1. Wires in Power Cable W1
CONNECTOR PIN
CORRESPONDING WIRE
1
White (coax center conductor)
2
Shield (coax outer conductor)
3
No connection
4
Violet
5
Red
Input Port and Test Port Resistance Checks
1. Ground the leads of the DMM by touching them to the grounded
instrument chassis.
2. Measure the resistance from the center contact of input oort
connector J1 to the center contact of test port connector J2.
In the 85020A, the resistance should be 33 ohms +2 ohms. In
the 85020B, the resistance should be 46 ohms +2 ohms.
3. Measure the resistance from the center contact of input
connector Jl to signal ground (the black/white v;ire connected
to the microcircuit housing). In the 85020A, the resistance
should be 83 ohms +2 ohms. In the 85020B, the resistance
should be 118 ohms +2 ohms.
4. Measure the resistance from the center contact of test port
connector J2 to signal ground. In the 85020A, the resistance
should be 83 ohms
^2
ohms. In the 85020B, the resistance
should be 118 ohms +2 ohms.
5. If the above resistance measurements are not correct, the
bridge microcircuit assemble A1 is defective and must be
replaced.
CAUTION
Do not attemot to disassemble or repair
the bridge microcircuit assembly Al,
including connectors Jl and J2 and
reference termination ATI. Do not remove
or loosen any screws on this assembly. Anv
attempt to perform any disassembly or
repair not clearly outlined in this manual
will automatically void the warranty.
The bridge microcircuit assembly, including input and test