724/725/726
Calibration Manual
14
The time required for a self-resetting fuse to reset depends on the magnitude of the
overload. If a self-resetting fuse does not reset, return the Calibrator to an authorized
service center for repair.
If a replaceable fuse has been damaged, it needs to be replaced. The fuses can be
removed and checked for resistance. A value of < 10 Ω is good.
The calibrator comes equiped with three 0.2 A 250 V socketed fuses.
• Problems while measuring with the right jacks indicate that F3 may have opened.
• Problems while measuring
or sourcing with the center jacks or the TC jacks
indicate that F2 may have opened.
• If you can’t measure or source current with the left jacks, F4 may have opened.
To access the fuses, refer to instructions under “Replacing the Batteries”. The fuse
compartment is located below the battery compartment. Use needle-nosed pliers to
remove them and test them with a multimeter. Replace the fuse with the proper
replacement fuse and follow the directions for reassembling the Calibrator. Refer to
Figure 1.
Remote Control Interface (725 and 726)
The Calibrator’s serial interface and remote control commands let you use a PC to
remotely select Calibrator functions and read the Calibrator’s display. This remote
interface is especially useful if you want to write your own calibration software.
The 726 remote control interface is always active.
To activate the 725 remote control interface, proceed as follows:
1. Turn off the UUT; then use the Fluke 700SC serial interface cable to connect the
UUT to a serial port on the PC.
2. Start the terminal communication software on the PC. Create a new connection with
the following properties:
• Bits per second: 9600
• Data bits: 8
• Parity: None
• Stop bits: 1
• Flow control: None
• Local echo on
3. Hold down the Calibrator’s M button while turning the Calibrator on.
4. Use the commands given in Tables 2 through 4 to remotely control the Calibrator.
Table 2. Upper Display Remote Commands (725)
Remote Command Description
i mA measurement
L mA Loop Power
E Voltage measurement
B Single broadcast of the most recent upper display value and units
( Single broadcast of most recent upper display value without header or units
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