Section 6: CALIBRATION PROCEDURE
Do not attempt to recalibrate unless
you are absolutely sure that the con-
trol needs to be recalibrated and that the proper
equipment is available. Once this is preformed, all
other calibration information will be lost!
WARNING!
Equipment Needed:
1) Standard millivolt power source range 0-
100mV, accuracy ±0.01%
2) Standard voltage power source range 0-10V,
accuracy ±0.01%
3) Standard current power source range 0-20mA,
accuracy ±0.01%
4) Standard ohm source range 0-300 ohm,
accuracy ±0.01%
5) Standard thermometer range 0-50.0°C,
accuracy ±0.2°C
6) A cooling fan may be needed to keep
equipment cool
7) Thermocouple simulator
8) Pushbutton switch
Calibration Set-up:
1) Select Input type to J T/C, UNIT = C,
RESO = 1dp
2) Turn power OFF
3) Disconnect all wiring
4) Connect wiring as shown below:
5) A fan should be used to keep the cold junction
compensator cool. (Lower PCB rear)
+
–
12
13
14
15
16
V
V
–
+
ETR-9200
40mV
200 ohm
10V
20mA
SWI
PTA
TC-/MV- COM+
MA-
V-
Calibrate
A-D Converter
or
or
or
Adjusts the Cold junction compensation code.
(Range -19.9 to 42.7)
Adjusts the Drift compensation code.
(Range -6.6 to 6.6)
Long
Long
Long
Calibrate the A-D converter and enter
the Cold-Junction compensation code.
Calibrate the 0
4-20mA and enter it.
Enter the drift compensation code
Calibration Steps:
1) Enter the “Engineering Level” by pressing the
and keys simultaneously. Continue to press
these keys until is displayed. (See
flow chart below.)
2) Press the key to view .
3) Use the and keys to enter the room
temperature on the upper display in degrees °C.
Once the proper room temperature is entered,
press the key for 4 seconds. After the key
is released, the upper display will strobe, indicating
that the new value has been loaded into the
memory.
4) Press the key to view .
5) The upper display should read 0.00. Close
SW1. The upper display should now read 20.00. If
the value is not 20.00, make sure that the current
source is accurate. After a value of 20.00 is dis-
played in the upper display, then the key should
be pressed for 4 seconds. After the key is
released, the upper display will strobe. This
indicates that the new value is properly entered into
the controller memory.
6) Press the key to view .
7) The lower display should be 0.00. If it isn’t,
change the value using the and keys. After
0.00 has been obtained, press the key for 4
seconds. When the key is released, the upper dis-
play will strobe. This indicates that the new value
has been properly entered into the memory. If the
value was 0.00, there is no need to load the
information into the memory again.
8) Remove all connections. Now connect a
thermocouple simulator accross terminals 13 and
14 and check calibration (controller must be pow-
ered for 30 minutes). If a different input is used,
check that input also. If the temperature is incor-
rect, perform steps (2) and (3) above.
9) If the controller is still not accurate the drift must
be adjusted. Enter the Engineering Level and go to
. Press the key until is
displayed. Use the and keys to enter the
correction factor that will be shown in the lower dis-
play. This number will be added or subtracted from
the upper display. Once the values are correct,
press the key for 4 seconds. This will load the
new value into the memory. If the value is success-
fully entered into the memory, the upper display will
strobe.
ENGINEERING LEVEL
