26
CALIBRATION PROCEDURE
Calibration parameters are logically divided into groups
of two parameters each - minimum range value and
maximum range value. A calibration check is provided
after entering the values of each group. A calibration
check can be initiated without making an entry: press
the FUNC key to advance to the desired calibration check
(t. - rj. - P. - A.).
Before beginning calibration, open internal switch V2 (see
configuration procedure Figure 2).
Calibration Parameters
Following is a complete list of calibration symbols:
Code Parameter
tL TC Input Minimum Range Value
tH TC Input Maximum Range Value
t. TC Input Check
rJ Cold Junction Compensation
rJ. Cold Junction Compensation Check
PL RTD Input Minimum Range Value
PH RTD Input Maximum Range Value
P. RTD Input Check
AL Current Transformer Input Minimum Range Value
AH Current Transformer Input Maximum Range Value
A. Current Transformer Input Check
General Guidelines
a)The instrument should be mounted in its case in order
to keep the internal temperature constant.
b) Ambient temperature should be stable. Avoid drift
dure to air conditioning or other mechanical devices.
c)Relative humidity should not exceed 70%.
d) Minimum warm up time should be at least 20 minutes.
e)Operate as much as possibnle in a noise free
enviornment.
f) During calibration, connect one input at a time to the
rear terminal block.
g) Use calibrators with the following:
Accuracy
TC Input ±0.005% output
±0.001% range
±5 microvolt
RTD Input: ±0.02%
±0.0025 Ω/decade
CJ Compensation: Better than 0.1 °C
Resolution
TC Input: ±1 microvolt
RTD Input: 10 milliohm
CJ Compensation: Better than 0.1 °C
Current transformer input 0.1 mA AC r.m.s.
Procedure
Switch on the instrument; the display will show “CnF”.
Press the s key and the display will show “CAL”. Press
the “FUNC” key to start the calibration process.
Repeatedly press the FUNC key until the desired
calibration (parameter) code appears.
The lower display will show the parameter code while
the upper display shows “ON” or “OFF”.
Use the s key to select between ON and OFF. To go to
the next parameter without modifying the calibration,
press the FUNC key when the display shows “OFF”.
To start parameter calibration, press the FUNC key when
the display shows “ON”.
NOTE: Press the MAN key to display the previous
parameter without storing the new calibration.
To Next Page
Loading...