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Calibration of output circuit (D/A)
The output circuit (D/A) should be
calibrated by the following procedure
when necessary.
Make calibration wiring transmitter
according to "Calibration" in Appen-
dix A2, and calibrate the output cir-
cuit with the HHC using the follow-
ing procedure.
When the <LRV> key is pressed at
the display of 1 , the display 2 for
4mA current output and its
calibration will appear on the screen.
When the <URV> key is pressed, the
display 7 for 20mA current output
and its calibration will appear on the
screen.
Under display 1 , input a desired
value within a range of 3.8 to 20.8mA
and then press <ENT> two times.
At this input value, a regulated cur-
rent output is available.
Under display 4 , input digital values
measured by digital voltmeter.
Under display 4 , the output circuit is
calibrated when pressing <ENT>.
B: OUTPUT ADJ
C: DATA
< INC >
< CHANGE >
B-1:OUTPUT SET
0mA
< LRV/URV/ENT/CL >
B-2: OUTPUT MODE
XX.XXXmA
CURRENT CONST.
< CALB > < CHNG > < CL >
B-3: OUTPUT CALIB
XX.XXXmA CONST.
0mA (EXT.mA)
< ENT > < CL >
B-3: OUTPUT CALIB
XX.XXXmA CONST.
YY.YYYmA (EXT.mA)
CHANGE OK? < ENT/CL >
< CHANGE > < CL >
B-2: OUTPUT MODE
XX.XXXmA
CURRENT CONST.
B-4: OUTPUT
XX.XXXmA CONST.
YY.YYYmA (EXT.mA)
CALIBRATING
B-4: OUTPUT
XX.XXXmA CONST.
YY.YYYmA (EXT.mA)
NOT CAL1B. < CL >
(Input of XX.XXXmA at )
Calibration
impossible
G
OUT
(OTHERS)
B-1:OUTPUT SET
4.000mA
CHANGE OK? < ENT/CL >
B-1: OUTPUT SET
20.000mA
CHANGE OK? < ENT/CL >
B-1:OUTPUT SET
XX.XXXmA
CHANGE OK? < ENT/CL >
1
1
9
72 8
3
4
5
6
10
10
appears when the
adjustable range is
exceeded.
INC
CHNG
LRV URV ENT
CL
ENT
CL
ENT
CL
ENT
CL
< OTHERS >
CALB CHNG
CL
CHNG
CL
ENT
CL
ENT
CL
CL
(4 , 20mA)
After setting and calibrating the con-
stant current output, be sure to reset
the HHC display to the initial display.
In this way, the transmitter output is
reset to the measurement output. It
should be noted that if HHC is
removed from the transmitter loop or
the HHC power is turned OFF when
the constant current output has been
set, the transmitter output is retained
at the constant current output.
Important
B: OUTPUT ADJ
<INC> <CHANGE>