©
National Instruments Corporation
5
TC-2095 Terminal Block Calibration Procedure
b.
Connect a test connector adapter to 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 reaches equilibrium 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 thermometer calibrated to within 0.1
°
C accuracy.
Position the thermometer as near as possible to the CJC sensor.
6.
Convert
V
meas
(in volts) to measured temperature
T
meas
by performing
the following calculations:
a.
Calculate
b.
Calculate
c.
Calculate
where
T
meas
is in degrees Celsius
a
= 1.295361
×
10
–3
b
= 2.343159
×
10
–4
c
= 1.018703
×
10
–7
x
2.5
V
meas
–
5,000
---------------------------
=
y
V
meas
x
-------------
ln
=
T
meas
1
a
y b
cy
2
+
(
)
+
----------------------------------
273.15
–
=
