SCXI-1303 Terminal Block Calibration Procedure
4
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2.
Connect a calibrated DMM to the temperature-sensor output of the
terminal block.
a.
Refer to Figure 2 to locate jumper W1 on your terminal block and
verify that MTEMP is jumpered.
b.
Strip 0.5 inches of insulation from one end of a 22 AWG solid
wire. Insert the stripped end of the wire into terminal A3 on the
96-pin female DIN connector on the rear of the terminal block.
Attach the other end of this wire to the positive input terminal of
the calibrated DMM.
c.
Connect the negative input terminal of the calibrated DMM to the
negative terminal of the +5 VDC power supply.
3.
Place the terminal block in a temperature-controlled environment
where the temperature is between 15 and 35
°
C.
4.
When the terminal block temperature equilibrates with its
surroundings, measure the temperature sensor output V
meas
using
a calibrated DMM.
5.
Measure the actual temperature T
act
in the temperature-controlled
environment using a calibrated thermometer.
6.
Convert V
meas
(in volts) to measured temperature T
meas
(in degrees
Celsius) by performing the following calculations:
a.
Calculate
b.
Calculate
c.
Calculate
where T
meas
is in
°
C
a = 1.295361 × 10
–3
b = 2.343159 × 10
–4
c = 1.018703 × 10
–7
x
2.5
V
me as
–
5000
---------------------------
=
y
V
m eas
x
-------------
ln
=
T
meas
1
a
y b
cy
2
+
(
)
+
----------------------------------
273.15
–
=
