Output N-Type Connector Replacement (Coaxial Shunts); Verification Of Operation After Repair - Fluke A40B Instruction Manual

Output N-Type Connector Replacement (Coaxial Shunts)

Use the following procedure to replace the N-type output connector:
1. Remove the output end plate (Figure 11-  ).
2. Remove the 3 mm screws, nuts and washers from the N-type connector.
3. Using solder braid and the solder suction tool, remove the solder from the N-
type connector base plate, PCB C.
4. The inner pin of the N-type connector is connected by 18 mm (0.71 inches) of
20 SWG tinned copper wire to PCB B. See Figure 13. Working between and
taking care not to damage the PCB struts, melt the solder attaching the wire
from the back of PCB B and withdraw the N-type connector. It may be
necessary to repeat both solder removal steps until both the base and the
center pin are free.
5. Remove excess solder from the connector pad on PCB B and C.
6. Mount the new connector to the Current Shunt with the original screws and
washers. Take care that the 20 SWD wire is correctly located through PCB B.
7. Position the nuts with the magnetized wrench and tighten the screws until the
connector is securely positioned. Do not fully tighten the screws as the N-
type connector may settle when residual solder melts.
8. Solder the N-type connector base to the end PCB. Then, working between
the PCB struts, solder the connector wire to PCB B.
9. Fully tighten the 3 mm screws securing the connector.
10. Clean any flux residue from the soldered areas taking care not to get
cleaning fluids on the shunt resistors.
11. Replace the end plate and binding post.

Verification of Operation after Repair

Apply limited input current within specifications of product and verify the correct
output.
Check to see that the ground connection is still connected to the chassis by
resistance measurement.
Figure 13. Output Voltage Connector
Precision AC Current Shunt Set
Repair Procedures Including Disassembly and Reassembly
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