DKM-250 User Manual V-2.0
32
Vin voltage is generated internally and used to check that the internal
power supply is operating.
In Vin calibration mode, the first display will show “vIn”. The second
screen will display the measured instantaneous Vin voltage. The third
display will display the calibration coefficient (high 4 digits only)
Adjust UP and DOWN menu buttons until the value displayed in the
second screen is correct. In normal operation Vin should be
17.80volts.
When the value is correct then press SET button. The unit will switch
to 4mA calibration of the 4-20mA output.
In 4mA calibration mode, the first display will show “4mA”. The
second display is blank. The third display will show the calibration
coefficient necessary to send 4mA from the analog output.
Measure the analog output with a precision ampermeter. Adjust UP
and DOWN menu buttons until the value displayed in the ampermeter
is 4.00mA.
When the value is correct then press SET button. The unit will switch
to 20mA calibration of the 4-20mA output.
In 20mA calibration mode, the first display will show “20mA”. The
second display is blank. The third display will show the calibration
coefficient necessary to send 20mA from the analog output.
Measure the analog output with a precision ampermeter. Adjust UP
and DOWN menu buttons until the value displayed in the ampermeter
is 20.00mA.
When the value is correct then press SET button.
In earth voltage calibration mode, the first display will show “EarH”.
The second display shows the instantaneous voltage measured at the
EARTH input. The third display shows the calibration coefficient.
If no earth leakage is present (input open) then half the supply voltage
should be measured. Adjust UP and DOWN menu buttons until the
value displayed in half the supply voltage.
When the value is correct then press SET button.
As this is the last calibration parameter, the display will switch to the
first calibration parameter, which is 110V voltage input calibration.
