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)
8
9
10
11
12
ETR-3200
+
–
V
10V
200 ohm
20mA
SWI
V
–
+
40mV
PTA
TC-
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
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 display in degrees °C. Once
the proper room temperature is entered, press the
key for 4 seconds. After the key is
released, the display will strobe, indicating that
the new value has been loaded into the memory.
4) Press the key to view .
5) The display should read 0.00. Close SW1. The
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 displayed in the
display, then the key should be pressed for 4
seconds. After the key is released, the display
will strobe. This indicates that the new value is
properly entered into the controller memory.
6) Press the key to view .
7) The 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 display 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 across terminals 10 and
11 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 display. This
number will be added or subtracted from the
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 successfully entered
into the memory, the display will strobe.
ENGINEERING LEVEL
