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
mode
CAL
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.
RM4IVMAN-2.1-0
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