The procedure for entering the second scaling point CAL2 is as follows:
a. Ensure that an input signal is present at the input terminals, this will usually be at the high
end of the signal range e.g. 20mA for a 4-20mA input. The change in input signal from the CAL1
input must be at least 10% of the input range full scale.
b. At the CAL2 function press ^ and v simultaneously then release them. The display will show
the live input value. Do not be concerned at this stage if the live input display value is not what
is required. It is important that the live input value seen is a steady value, if not then the input
needs to be investigated before proceeding with the scaling.
c. Press then release the F button. The display will indicate SCL2 followed by a value. Use the
^ or v button to change this value to the required display value at this input. e.g. if 20mA was
input and the required display at 20mA was 500 then ensure 500 is entered at SCL2. Press the
F button to accept changes or the P button to abort the scaling. If the scaling has been accepted
the CAL End message should be seen.
Example - Flow chart showing scaling using two live inputs
Enter via modeCAL
Place at the input a low level
signal for which the required
scaling value is known e.g. 4mA
Go to the function
and press and
simultaneously a "live"
display will now be seen
CAL1
^ v
If the "live" display is stable
press the button. The
message will be seen
F
SCL1
If the "live" display is stable
press the button. The
message will be seen
F
SCL2
Use the or button to
enter the required scale
value for the input then press
to accept the new scaling value
^ v
F
Use the or button to
enter the required scale value
for the second input then press
and release to accept the
new scaling value
^ v
F
Press and release until
the message
is seen and the display
returns to normal measurement
FUNC End
F
The message will be seen.
Increase the input signal then
press and simultaneously.
Ideally the second input should be
as close to 100% of range as
possible e.g. 20mA. A "live"
display will now be seen
CAL2
^ v
Note: If the "live" display at any scaling
point is not stable then check the input
signal for stability.
42 of 56 PM4IVMAN-2.4-0
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