Yokogawa EJX440A - Manual (Page 30)

<3. Operation>
3-20
IM 01C25T01-01E
3.5.8 Trim Analog Output
Fine current 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 exactly read 4.000 mA
and 20.000 mA with an 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 a meter whose
scale is 0 to 100%.
1
F0333-1.ai
Select the D/A trim item.
EJX:YOKOGAWA
Analog output trim
1 D/A trim
2 Scaled D/A trim
3 Clear D/A trim
HELP SAVE HOME OK
EJX:YOKOGAWA
WARN-Loop should be
removed from
automatic control
DEL SET ABORT OK
2
Press OK (F4).
EJX:YOKOGAWA
Connect reference
meter
HELP DEL ABORT OK
3
Connect the ammeter (±1µA is
measurable), and press OK (F4).
EJX:YOKOGAWA
Setting fld dev
output to 4mA
HELP ABORT
4
Press OK (F4), and the
transmitter outputs a 0% output
signal.
DEL OK
(OK)
(OK)
(OK)
EJX:YOKOGAWA
Enter meter value
4.000
4.115
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 an adjustment using an ammeter (±1µA is
measurable)
1. Device setup
2 Diag/Service
3. Calibration
2. Analog output trim
1. D/A trim
Ammeter reading: 4.115
6
F0333-2.ai
If 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.
EJX:YOKOGAWA
Fld dev output 4.000
mA equal to reference
meter?
1 Yes
2 No
HELP SET ABORT ENTER
EJX:YOKOGAWA
Setting fld dev
output to 20mA
DEL SET ABORT OK
7
4
4
5
5
Press OK (F4), and the
transmitter outputs a 100% output
signal.
EJX:YOKOGAWA
Enter meter value
20.000
19.050
HELP DEL ABORT ENTER
8
Carry out the same procedures as
those described under and .
EJX:YOKOGAWA
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‘
EJX:YOKOGAWA
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