UNIVERSAL TRANSMITTER UT-94
REF NO: m98A/om/101
Issue NO: 15
User’s Manual Page 15 of 25
10. Calibration Procedure
Calibration for the unit is to be carried out by an experienced engineer only. Reference used for the
calibration should be of high accuracy (0.1 % better) and good stability.
After Giving correct Password Press the Enter Key to enter into the menu levels (Scroll along using the
Enter Key itself. From it select
“CAL” using the SELECT Key).Here we have 3 options amb, INP, and OUT.
Scroll along using the Enter Key and select the required option using the SELECT Key.
10.1 Ambient Calibration:
Once you enter the ambient calibration option the ambient temperature sensed by the device is
shown. Now to calibrate it press the Select Key that blinks the digits one by one on each press, use
the Increment Key to change the value from 0-9.
Adjust the values as required and press the Enter Key to save the value. Exit from the menu levels
using the Inc/Esc Key. Now we have both Input and output calibration.
10.2 Input Calibration:
Here calibration is done only after entering span value (For RTD Zero & Span value sequentially).
For this we require a source with good stability and resolution.
Any of the inputs can be calibrated at any point within the entered range. The Inputs are divided
into six groups. Calibrating any of the inputs of a group will calibrate all the other inputs of the
same group.
The groups are:
Group0: ETC, JTC, KTC, TTC, NTC.
Group1: BTC, RTC, STC.
Group2: RTD.
Group3: 0-5V, 1-5V.
Group4: 0-2V, 0.4-2V, 0-20mA, 4-20mA.
Group5:mV (-10 to 500mV)input range : -10 to 25mV , -10 to 100mV, -10 to 500mV
Group6:Pot (0 to 2000 ohms) input range : 0 to 100 ohms, 0 to 600 ohms, 0 to 2000 ohms
Now select the INP from the menu feed the Zero input value for zero calibration
(For RTD only
) and enter
the Zero calibration option using the Select Key. Now change the values as required using the select and Inc
Key. Save the value using the Enter Key and Exit one level back using the Inc/Esc Key.
Scroll to the Span calibration using the Enter key, Press Select Key to enter into the span calibration.
Feed the span input for calibration and change the values as required and press Enter to perform
calibration, Here it show a Wait Message until it completes the calibration Procedure. It automatically saves
and applies the calibration parameters now. Exit the menu level using the Inc/Esc Key. (There is no need for
repetition of calibration except RTD inputs).
