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11
2564 Thermistor Scanner Module
This section explains the features and operation of the optional 2564 Thermis-
tor Scanner Module.
11.1
Description
The 2564 Thermistor Scanner Module is an add-on module that allows the
1560 to measure temperature with up to eight thermistors. It accepts nearly ev-
ery type of thermistor sensor with either two, three, or four wires. It uses very
small excitation currents to minimize sensor self-heating. The excitation current
alternates polarity to minimize the effects of thermoelectric offsets. Up to eight
sensors can be connected to the 2564 simultaneously and measured alternately.
11.2
Specifications
Resistance range
Resistance accuracy, one-year
0 to 2 kΩ
2 to 100 kΩ
100 kΩ to 1 MΩ
Resistance accuracy, short-term
0 to 2 kΩ
2 to 100 kΩ
100 kΩ to 1 MΩ
Temparature accuracy, one-year (with 10kΩ, α=0.04 sensor;
not including sensor uncertainty)
0°C
25°C
50°C
75°C
100°C
Temperature coefficient
Excitation current
Maximum lead resistance
Sample time
Number of channels
Recommended operating temperature range
Absolute operating temperature range
Weight
1
The accuracy specifications apply within the recommended operating temperature range. Accuracy limits
are increased by a factor of the temperature coefficient outside this range.
2
Short-term accuracy includes nonlinearity and noise uncertainties. It does not include drift or calibration
uncertainties.
1
1, 2
1
1
11 2564 Thermistor Scanner Module
0 to 1 MΩ
0.2Ω
100 ppm of reading
300 ppm of reading
0.15Ω
75 ppm of reading
250 ppm of reading
±0.0025°C
±0.0025°C
±0.0025°C
±0.003°C
±0.006°C
2.5 ppm/°C
2, 10 μA; automatically selected: 1 Hz
100Ω
2 seconds
8
18 to 28°C (64 to 82°F)
5 to 35°C (40 to 95°F)
2.5 lbs. (1.1 kg.)
Description
139
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