IM 01C22T01-01E
2-14
2. HART COMMUNICATOR OPERATION
(14) Trim Analog Output
Fine output adjustment is carried out with
D/A trim
or
Scaled D/A trim
.
• D/A Trim
D/A trim
is to be carried out if the calibration
digital ammeter does not read 4.000 mA and 20.000
mA exactly with the output signal of 0% and 100%.
• Scaled D/A Trim
Scaled D/A trim
is to be carried out if the output
is adjusted using a voltmeter or other types of
meters or using a meter whose the scale unit is 0 to
100%.
1
F0230.EPS
Select the D/A trim item.
EJA:
Trim analog output
1 D/A trim
2 Scaled D/A trim
HELP
SET
HOME
OK
EJA:
WARN-LOOP should be
removed from
automatic control
DEL
SET
ABORT
OK
2
Press OK (F4).
EJA:
Connect reference
meter
HELP
DEL
ABORT
OK
3
Connect the ammeter (
±
1
µ
A is
measurable), and press OK (F4).
EJA:
Setting fld dev
output to 4mA
HELP
ABORT
4
Press OK (F4), and the transmitter
outputs the output signal of 0%.
DEL
OK
(OK)
(OK)
(OK)
EJA:
Enter meter value
4.000
HELP
ESC
5
Enter the read value 4.115 of the
ammeter, and press ENTER (F4).
(The output of the transmitter
changes.)
DEL
ENTER
(ENTER)
‘4 . 1 1 5’
Example 1: For the adjustment using an ammeter (
±
1
µ
A is
measurable)
1. Device setup
2 Diag/Service
3. Calibration
2. Trim analog output
Ammeter reading: 4.115
6
F0231.EPS
Because the reading on the
ammeter is 4.000 mA, select YES
and press ENTER (F4).
If the reading is not 4.000 mA,
select item 2. NO. Repeat steps
and until the ammeter reads
4.000 mA.
EJA:
Fld dev output 4.000
mA equal to reference
meter?
1 Yes
2 No
HELP
SET
ABORT
ENTER
EJA:
Setting fld dev
output to 20mA
DEL
SET
ABORT
OK
7
4
4
5
5
Press OK (F4), and the transmitter
outputs the output signal of 100%.
EJA:
Enter meter value
20.000
HELP
DEL
ABORT
ENTER
8
Carry out the same procedures as
those described under and .
EJA:
Fld dev output 20.000
mA equal to reference
meter?
1 Yes
2 No
HELP
ABORT
9
Returning fld dev to original
output appears.
DEL
ENTER
(OK)
(ENTER)
(ENTER)
‘1 9.0 5 0‘
EJA:
NOTE-Loop may be
returned to automatic
control
HELP
ESC
10
Press OK (F4).
DEL
OK
(OK)
(ENTER)
Ammeter reading: 19.050
Ammeter reading: 20.000
Ammeter reading: 4.000
