Process Calibrators
Basic Maintenance
23
718Ex Approved Batteries
Battery Manufacturer Type
Alkaline, 9 volt Duracell 6LR61/MN1604
Alkaline Ultra, 9 volt Duracell 6LR61/MX1604
Alkaline Energizer, 9 volt Eveready 6LR61/522
Alkaline Power Line Industrial Battery, 9 volt Panasonic 6LR61.9V
Replacing the Fuse
XW Warning
To avoid personal injury or damage to the calibrator, use only a
0.125A 250V fast fuse, Littelfuse
2AG.
To check if the fuse(s) are blown, refer to Table 33.
Table 33. Verifying a Blown Fuse
Calibrator Model Determining a Blown Fuse
712 V1.1 Put the calibrator in simulate mode (OUTPUT on the display), and check for proper
resistance at the calibrator’s OUTPUT terminals. An open or very high impedance
suggests fuse F1 is blown.
712 V1.2 Fuse F1 is probably blown if no current comes from the center jacks when in input
2W mode. Fuse F2 is probably blown when output mode will not work.
712 ≥V2.0 Fuseless overvoltage protection.
713 Series
716
717 Series <V1.9
718 Series <V1.9
Fuse F1 is probably blown if the mA measurement display reading does not
respond to current applied to the current (mA) inputs.
717 Series ≥V2.0
718 Series ≥V2.0
Fuseless overvoltage protection.
714 <V1.9 Fuse F1 is probably blown if, in the input mode, the calibrator always reads OL,
even with a thermocouple connected.
714 ≥V2.0 Fuseless overvoltage protection.
715 Fuse F1 is probably blown if:
• in the mA input mode, the calibrator always reads 0.000, even with a signal
applied.
• in the mA output mode, with a short across the mA OUTPUT jacks, OL is
flashing on the display.
Fuse F2 is probably blown if:
• in the V output mode, with the test leads removed from the calibrator, the
display flashes OL.
• in the V input mode, the calibrator always displays OL, even with a signal
applied that is within the measurement range.
715 ≥V2.0 Fuseless overvoltage protection.
718Ex No user serviceable fuse. An open fuse voids safety certification. The unit should
be returned to Fluke for repair.
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