80
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Menu B : Calibration of output circuit D/A
The transmitter has a numerical electronic. The
cell signals are processed by a microprocessor
and sent to a digital/analog D/A converter to con-
vert the signal in 4-20 mA.
This menu allows to calibrate the D/A converter. It
is necessary to connect a milliamperemeter (ac-
- 1micro A) to chack the output signal.
This menu allows too to check, with a 4-20 mA
signal, the measuring loop.
The output circuit (D/A) should be calibrated by
the following procedure when necessary.
Make transmitter connection according to "Cali-
bration" in appendix A2, and calibrate the output
circuit using the following procedure.
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c
, the display
d
for 4mA current output and its
calibration will appear on the screen.
During this phase, a 4mA constant current is
generated.
- Press "CALB" for the calibration
- Press "CHNG" or "CL" to cancel
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i
for 20mA current output and its calibration will
appear on the screen.
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-
ated.
- Press "CALB" for the calibration
- Press "CHNG" or "CL" to cancel
Under display
c
, input a desired value within a
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to generat a constant current.
- Press "CHANGE" or "CL" to cancel.
Under display
f
, input digital values measured
by digital voltmeter.
Under display
f
, the output circuit is calibrated
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The transmitter will calculate automatically the
gap between the theoritical and the measured
values. It will rectify in the D/A converter.
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 HHC
display to cancel with the inital display of menu B.
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>
Important
