Tek-Trol TEK-LCD 7800A-0L1, Инструкция по эксплуатации, Страница: 28 / 36

3.8.5 Internal Calibration ( ICAL )
The internal calibration is the meter’s master calibration that makes scaling the meter without a
signal source possible. Use of a calibrated signal source is necessary to perform an internal
calibration of the meter. Check calibration of the meter at least every 12 months. Incorrect
calibration will affect the ability of the meter to properly read, scale, and display the input.
Notes:
The signal source must have a full-scale accuracy of 0.002% or better between 4 and 20 mA
in order to maintain the specified accuracy of the meter.
Allow the meter to warm up for at least 15 minutes before performing the calibration
procedure.
Press MENU navigate to ADVANCE and press enter to access the Advanced Features Menu .
Press the UP-arrow button to scroll to the Internal Calibration menu (ICAL) and press ENTER .
The meter displays 4.000. Apply a 4.000 mA signal and press ENTER . The display flashes for a
moment while the meter is accepting the signal.
After the signal is accepted, the meter displays 20.000. Apply a 20.000 mA signal and press
ENTER .
The display flashes for a moment while the meter is accepting the signal.
INDICAT
INDICAT
AL M
ALARM SET
There is no need to recalibrate the meter when first received from the factory. The meter is
factory calibrated prior to shipment. The calibration equipment is certified to NIST standards