26
Calibration of output circuit D/A
The output circuit (D/A) should be cali-
brated by the following procedure when
necessary.
Make calibration wiring transmitter ac-
cording to "Calibration" in appendix A2,
and calibrate the output circuit with the
HHC using the following procedure.
When the <LRV> key is pressed at the
display of 1 , the display 2 for 4mA cur-
rent 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 current
output is available.
Under display 4 , input digital values
measured by digital voltmeter.
Under display 4 , the output circuit is cali-
brated 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
7
2
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 constant
current output, be sure to reset the FXW
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.
B:
OUTPUT ADJ
<INC> <CHANGE>
