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Model: LC5296 Dual Channel Temperature Controller

Doc. Ref. no.:- m61C/om/101

Issue no. 01D/ENGG-114

User’s Manual Page 24 of 30

8. CALIBRATION PROCEDURE

8.1 Procedure for CAL-zero and CAL-span

The instrument is factory calibrated for the specified range, but due to long term drift

of components, re-calibration may be necessary in some cases. For calibrating the

instrument a reliable source is required. This source should be at least ten times

accurate compared to the range of the instrument.

The unit can be calibrated without opening it and without trim pots.

For Entering into the Calibration Mode, Please refer Menu Layout.

After applying appropriate Input from the calibrator source, press ‘INCREMENT’ OR

‘DECREMENT KEY’ to bring the actual process value on display.

Example:-

At zero calibration reading expected on the display is 100 and it shows 107, adjust

the process value to 100 by using ‘DECREMENT KEY’. Now press ‘SET’ to store the

calibration parameter in non-volatile memory. Similarly one can calibrate Ambient,

SPAN and retransmission parameters.

8.2 Procedure for RET-zero and RET-span

For calibrating the retransmission output, both retransmission zero and

retransmission span has to be calibrated. At a time there can be either one or two

retransmission output available. If only one retransmission is used, then calibrate

RTZ1 (retransmission 1 zero) and RTS1 (retransmission 1 span) and if there are two

retransmission outputs available, then calibrate RTZ2 (retransmission 2 zero) and

RTS2 (retransmission 2 span) for second retransmission. No need to feed input

while calibrating retransmission o/p. it is like calibrating using digital trim pot. Only

look at the output, display value has no significance with output generated.

Example:-

At retransmission zero calibration, expected output is 4.00mA and it gives 4.153mA.

Then adjust the output value to 4.000 by using ‘DECREMENT KEY’. Now press

‘SET1’ to store the calibration parameter in non-volatile memory. Similarly one can

calibrate retransmission span.

Masibus LC5296 DC User Manual

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