Troubleshooting, Maintenance, and
Inspection
65
IM 767361-01E
Troubleshooting, Maintenance, and Inspection
Connection Method
Connect each instrument as shown below.
MT220
V
Hi
Lo
DC voltage
current
generator
Hi
Lo
Digital
multi-meter
MT220
Hi
Lo
Lo
Hi
Digital
multi-meter
COM
2794
For voltage calibration
For current calibration
COM
* Do not make any connections to the
current terminal of the MT220.
* Do not make any connections to the
voltage terminal of the MT220.
A
DC voltage
current
generator
Calibration Method
When you connect the pressure standard to each calibration point xi as shown
below, the value displayed on the instrument is given as yi since this is prior to
calibration. During the calibration, the correction factor is computed such that
x
i
=y
i.
Display
(x
0
, y
0
)
(x
1
, y
1
)
Input
0
(x
2
, y
2
)
(x
i
, y
i
) i=0, 1, 2
Calibration points
after calibration
befor calibration
Procedure (Using the Front Panel Keys)
1.
Press
MENU
.
2.
Hold down the
ZERO CAL
button for 2 seconds, until the
screen
appears. If this operation fails,
is displayed. If this happens,
repeat the above operation.
3.
In the
screen, press or to display
, then press
ENTER/LOCAL
to enter calibration mode. Select
to return to the normalmeasurement
screen.
4.
Press or to select the calibration item (current or voltage), then press
ENTER/LOCAL
. With this operation, the DMM measurement item changes
automatically.
5.
Press or to select the calibration point, then press
ENTER/LOCAL
.
Set the calibration point in the order ,
,
.
6.
When all three calibration points have been set, set the output on the standard
instrument. Read the values from the output of the standard equipment on the
digital multimeter, then press or to enter those values as calibration points.
Then press
ENTER/LOCAL
. That is, for a calibration point of 0, you must enter 0
on the instrument (if the standards instrument cannot output a 0, short the voltage
input terminal during voltage calibration and open the current input terminal during
current calibration.)
7.
The measured value prior to calibration is displayed for one second. If the values
set as calibration points differ greatly from the measured values there may have
been a user error or a problem with the connections, so enter the same calibration
points once again.
selected
+FS
DC generator set
to 5V
read
value of
DMM
measured
value
befor
calibration