Multifunction Electrical Tester Calibrator
Maintenance
91
Clean the Ground Bond Resistance and Loop/Line Impedance Relays
The power relays used in the Ground Bond Resistance and Loop/Line Impedance functions
must be periodically cleaned to minimize their contact resistance. The Ground Bond
Resistance and Loop/Line Impedance specifications are based on how often the relays are
cleaned. See the
5322A Specifications
.
If the relay cleaning procedure has not been done within the past 90 days, the Product
prompts you to run the procedure at startup with the displayed message:
Start the cleaning
procedure
. The message shows after the Product is turned on and allows you to run the
cleaning procedure immediately or to continue without cleaning the relays. If you do not run
the cleaning procedure, the same message shows during the next startup operation until you
run the relay cleaning procedure.
Besides the reminder function, start relay cleaning manually from the Setup menu. The
cleaning procedure exercises the relays on the REL board a number of times with current that
flows through them. To perform the relay cleaning procedure, disconnect all external
connections to the Product front panel.
To clean the relays:
1. Push the
Setup
softkey.
2. Use the cursor keys or rotary knob to highlight
Maintenance
and either push the
Select
softkey or push in the rotary knob.
3. Use the cursor keys or rotary knob to highlight
Relay cleaning procedure
and either push
the
Select
softkey or push in the rotary knob.
4. Push the
Select
softkey to start the procedure. The message
Please wait
shows. When the
relay cleaning procedure concludes, the Product automatically returns to the main menu.
Access the Fuses
The Product fuses protect both the line-power input and various front-panel terminals. The
subsequent sections describe the replacement procedures and list the appropriate fuses
used in the Product.
Line-Power Fuse
The Product has a line-power fuse in series with the power supply.
indicates the
proper fuse for each line voltage selection.
To replace the line power fuse:
1. Unplug the power cord from the Product.
2. On the rear panel, locate the fuse holder labeled
Power Fuse
.
3. Use a flat-blade screwdriver in the slot on the end of the fuse holder to unscrew the fuse
holder.
4. Replace the fuse with one rated for the selected line voltage.
5. Reinsert the fuse holder and screw it into the socket.
Содержание 5322A
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