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3.12. LINEAR INPUT
Select the appropriate type of input ( inPt ), define the scale by
adjusting Lo.SC and hi.SC .
In the example below, inPt = 4...20 (mA), Lo.SC = 0 , hi.SC =
100.0 , rESo = I.dP
For a signal of 4 mA, the Lo.SC value will be 0, for 10 mA it will be
37.5 and, for 20 mA, it will be 100.0. If the input signal exceeds these
limits, an error message LLEr or HHEr appears in the display.
3.13. LOCKING/UNLOCKING THE PARAMETERS
Locking all the parameters :
Press and hold the
and
simultaneously.
Locking the parameters in the same level of security :
Refer to chapter 3.6.5. for this operation.
4.1.
RECALIBRATION
!
There is no need to read this section if you do not need to recalibrate the instrument used. Do not try to recalibrate
unless you have the equipment and necessary metrological knowledge. Any recalibration undertaken definitively
erases the preceding calibration.
Equipment necessary
- Power supply 0...100 mV, accuracy 0.01%
- Power supply 0...10 V, accuracy 0.01%
- Power supply 0...20 mA, accuracy 0.01%
- Ω source, scale 0...300 Ω, accuracy 0.01%
- Thermometer 0...50.0°C, accuracy 0.2%
- Coling ventilator with an ON-OFF button
- Thermocouple for simulation
Method of calibration
1.
Select the type of input -tC , unit = °C , rESo = I.dP
Cut the power supply and disconnect the sensor. Connect the power supplies and sources
as shown below.
Put the ventilator close to the cold solder junction, located at the back of the instrument.
2.
Press the
and
operation until you see CALi / A-d appear in the display.
3.
Press
, the display indicates a number preceded by the prefix t
4.
Use the
and
key so that the value coincides with the value read on the thermometer
(ambient temperature).
5.
Press
for more than 4 seconds, the display goes blank for a moment then indicates the
ambient temperature in °C.
6.
Press and release
display indicates 0.00 .
7.
Press and hold the switch SW1, press the
8.
Press and release
keys to set this value to 0 . Then press on
keys for more than 4 seconds. The keyboard is now locked. To unlock, press the
4. MAINTENANCE
keys simultaneously to enter the utilities programme. Repeat the
, the display indicates a number preceded by the prefix A , and the
key for more than 4 s. The display now indicates 20.00 . Release SW1.
. The display indicates a number with a prefix d . If the number is not equal to 0.0 , use the
for more than 4 s. Code d is reinitialised.
100.0
(HISC)
LLEr
0
(LOSC)
4
36
HLEr
20
Input signal (mA)
and
STATOP 4850
PTA
TC-
COM+
mA-
12
13
14
15
-
+
SW1
40 mV
200 Ω
20 mA
+
-
10 V
and
keys
V-
16
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