26
Step 5: Calibrate the RTD reference voltage.
Send a 100 ohms signal to terminals 3, 4, and 5 according to figure
5-3.
Press
for
at least 4 seconds. The display will blin
k
for a
moment. If the display didn
'
t blin
k
, then calibration failed.
Step 6: Calibrate the RTD serial resistance.
Change the ohm
'
s value of the calibrator to 300 ohms. Press
for at least 4 seconds. The display will blin
k
for a moment. If the
display didn
'
t blin
k
, then calibration failed.
*
Input modification
and
recalibration
procedures for a
linear volt-
age
or a
linear current
input:
1. Change resistor R62 on the control board with the recommended
values specified in Table 5.1.
Low temperature coefficient resistors with
±1% ±50ppm should be
used for R62. Adjust the DIP switch according to Table 1.1
1
2
3
4
5
6
7
8
9
10
100 ohm
s
Input Function
R62
T/C, RTD, 0 – 60mV
28K
0 – 1 V
0 – 5V, 1 – 5V
0 – 10 V
150K
300K
300K
2. Perform step 1 to calibrate the linear input zero.
3. Perform step 2 but send a span signal to the input terminals 4 and
5 instead of 60mV. The span signal is 1V for 0–1V input, 5V for 0–5 V
or 1–5 V input, 10V for 0–10V input and 20mA for 0–20mA or 4–20mA
input.
Table 5.3 RTD Calibration
Summary of Contents for TEC-410
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