29
P.
RTD input check
The display shows “P.” followed by a number showing
the measured value in counts. The calibration for “PH”
is correct if the indication is “P.30 000”
±
10 counts.:
3 digit heat/cool
3 digit deviation bar
3 digit dual display
Alternately
a) Check the “Maximum Range” calibration by setting
300.000
Ω
(see parameter PL) on the resistance box;
the readout should be “P.30 000”
±
10 counts.
b) Check the “Minimum Range” calibration by setting
0.000
Ω
on the resistance box; the readout should
be “P.00 000”
±
10 counts.
c) Check linearity.
NOTE: The relation between the input signal and
counts for RTD input is not linear. The correct
relation is shown in the following table:
r
o
t
s
i
s
e
R
x
o
B
y
a
l
p
s
i
D
s
t
n
u
o
C
0
s
t
n
u
o
c
0
1
±
0
5
2
1
s
t
n
u
o
c
0
1
±
0
9
1
0
1
0
5
2
s
t
n
u
o
c
0
1
±
9
8
1
0
2
5
7
3
s
t
n
u
o
c
0
1
±
0
0
0
0
3
d) Press the FUNC key.
This completes the calibration procedure. To enter the
configuration procedure press the
▲
key, the display will
show “CnF”. If configuration and calibration are complete,
switch the instrument off and close the switch V2.
MAINTENANCE
1. Disconnect the power from the power supply terminals
and relay output terminals.
2. Remove the instrument from its case.
3. Using a vacuum cleaner or a compressed air jet (max.
3 kg/cm
2
) remove dust and dirt which may be present
on the louvers and on the internal circuits, being
careful to not damage the electronic components.
4. Clean external plastic or rubber parts with a cloth
moistened with ethyl alcohol (pure or denatured)
[C
2
H
5
OH]; or isopropyl alcohol (pure or denatured)
[(CH
3
)
2
CHOH]; or water [H
2
O].
5. Verify that there are no loose terminals.
6. Before re-inserting the instrument in its case, be sure
it is dry.
7. Re-insert the instrument and turn it on.
Содержание Barber Colman 7SD
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