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1529 Chub-E4 Thermometer Readout
PRT and Thermistor Calibration
rameter must be done last as the adjustments of C0 and C100 affect the measurement
at 400 W but C400 does not affect the measurements at 0 W or 100 W. Each channel
must be calibrated. Set the conversion type to RES to display resistance (see Sec-
tion 6.2.1.5, RES Conversion on page 34) and the RANGE parameter to 100 W. The
calibration should be performed with a four-wire connection and with the probe wiring
parameter set to four-wire (see Section 5.4, Probe Input Modules on page 18). The
accuracy required of the resistance standards is 1/4 of the instrument accuracy; that is
±0.000125 W at 0 W, ±0.0006 W ( 6 ppm) at 100 W, and ±0.0024 W (6 ppm) at 400 W.
The recommended procedure is as follows:
1. Connect a 0W resistor to the input and measure its resistance. If a shorting
Figure 49
2. Connect a 100 W resistor (6 ppm accuracy) to the input and measure its
3. Connect a 400 W resistor (6 ppm accuracy) to the input and measure its
4. Record the date in the DATE parameter and set the DUE parameter to the
5. Verify the accuracy at 0 W, 25 W or 50 W, 100 W, 200 W, and 400 W on each
118
wire is used the wire should run from the C2 terminal to the C1 terminal to
the P1 terminal to the P2 terminal (See Figure ). Note the average error in the
measurement. Adjust the C0 parameter by subtracting the measured error. For
example, if the input is exactly 0.0000 and the readout shows –0.0011, adjust
the C0 parameter by adding 0.0011.
C1
C2
P1
P2
Using a Shorting Wire
resistance. Note the average error in the measurement. Adjust the C100
parameter by subtracting the measured error. For example, if the input is exactly
100.0000 W and the readout shows 100.0295 W, adjust the C100 parameter by
subtracting 0.0295.
resistance. Note the average error in the measurement. Adjust the C400
parameter by subtracting the measured error. For example, if the input is exactly
400.0000 W and the readout shows 399.9913 W, adjust the C400 parameter by
adding 0.0087.
desired calibration interval.
channel.
C2
C1
P2
P1
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