be seen. To allow a zero operation beyond this point either the ZERO RNGE function value will
need to be raised or a new zero reference point introduced via the CAL ZERO function. If repeated
zero operations are required the ZERO RNGE function should be set to OFF or alternatively the
tARE operation could be considered.
6.5 Zero range zero calibration
CAL ZERO - Zero range zero calibration - a CAL ZERO zero operation can be used to ensure
that the display zero and the ZERO RNGE reference zero are at the same point after a calibration.
After a calibration the CAL ZERO operation can also be used to select a zero point other than
the display zero as the reference for the ZERO RNGE function. For example if the CAL ZERO
operation is carried out with a display reading of 500 and a ZERO RNGE reading of 10 the
zero range function will allow the display to zero only if the current display reading is between
490 and 510. To perform a calibration zero press the ^ and v buttons simultaneously at the
CAL ZERO function, a live reading will be seen, press the F button, the message CAL ZERO
End should now be seen indicating that the instrument has accepted the zero point. Although the
display reading will not change as a result of the calibration zero the input value on the display at
the time of the operation will be the new zero reference point for the ZERO RNGE function.
6.6 Uncalibration
UCAL - Uncalibrate - used to set the instrument back to the factory calibration values. This
function should only be used when calibration problems exist and it is necessary to clear the
calibration memory. To clear the calibration memory press the ^ and v buttons simultaneously
at the UCAL function. The message CAL CLr will be seen to indicate that the memory has
cleared.
44 of 56 PM4IVMAN-2.4-0
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