724/725/726
Calibration Manual
40
To begin calibration, or to select a particular calibration step, type the cal step (letter or
number), then press Enter on the PC keyboard. It is not necessary to run all of the
calibration steps when in the calibration mode. However, for the 726, certain
dependencies exist in that certain functions must be calibrated before others can be
calibrated. These dependencies are related to calibration only.
You must first calibrate mV Input and mV Output before calibrating thermocouples for
the 724, 725, and 726. At the end of each step on the calibration menu, the new
calibration constants for that step are saved, but not actually used until power is recycled.
When calibrating a measurement function, you must enter an input signal. For the 724
and 725, when the signal is connected and stable, press the space bar to start the
adjustment. For the 726, press the Enter key. Usually, the UUT will display a calibration
constant, then prompt for a second input value. Apply the new input value, then press the
space bar or Enter key depending on the Calibrator. After the adjustment is complete,
press the proper key to return to the Calibration Menu.
When calibrating a source function, you must enter the value of a reading. Type in the
numerical value of the calibration desired. This will put the UUT into the desired
calibration mode. When entering the calibration data for any source mode calibration, be
sure to enter the value in the units listed, but don't enter the units (mV, mA, etc.). After
the adjustment is complete, press the proper key to return to Calibration Menu. The
calibration values will vary slightly, unit to unit. The constants used in this procedure
may not appear exactly the same as on your UUT, but they should be approximately the
same.
Initiating Communication (724 and 725)
Starting with the UUT off, push and hold Q while turning the UUT on. Continue to
hold Q until "Cal mode" is displayed. “Enter Password:" appears on the display of all
Calibrators that have firmware version V1.91 or higher. A password has been added to
prevent users from accidentally changing the calibration of the Calibrator. The password
for all 724 Calibrators is 427. The password for all 725 Calibrators is 527.
The calibration menus, as seen on the PC screen, are as follows:
725 Calibration Menu
Calibrate Menu
1 - Cal Volts Input
2 - Cal Volts Output
3 - Cal mA Input
4 - Cal mA Output
5 - Cal mV Input
6 - Cal mV Output
7 - Cal Thermocouples
8 - Cal Ohms Hi Source
9 - Cal Ohms Low Source
A - Cal RTD LOW Range
B - Cal RTD HI Range
C - Cal ISO Volts
D - Cal ISO mA
Enter Selection :
724 Calibration Menu
Calibrate Menu
1 - Cal Volts Input
2 - Cal Volts Output
3 - Cal mV Input
4 - Cal mV Output
5 - Cal Thermocouples
6 - Cal Ohms Hi Source
7 - Cal Ohms Low Source
8 - Cal RTD LOW Range
9 - Cal RTD HI Range
A - Cal ISO Volts
B - Cal ISO mA
Enter Selection :
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