Cryo-con 24C - Table 8: Resolution for NTC Resistors; Table 9: 10 Mv Constant-Voltage Accuracy Specifications

Cryo-con Model 24C Specifications, Features and Functions
Resolution: Shown below are typical RMS resistance noise values measured
at 50% of full-scale on a room-temperature resistor with a 3-Second analog
time-constant.
Range 10mV 3.0mV 1.0mV
40W
1.0mA
255µW
1.0mA
255µW
100μA
2.6mW
400W
100μA
2.6mW
100μA
2.6mW
10μA
26mW
4KW
10μA
26mW
10μA
26mW
1.0μA
260mW
40KW
1.0μA
250mW
1.0μA
250mW
1.0μA
2.5W
Table 8: Resolution for NTC Resistors
Accuracy: Accuracy for the 10mV bias setting is specified in ranges
according to the following table. The formulas apply from the maximum to the
minimum resistance shown below.
Resistance
Range
Excitation
Current
Range
Min/Max
Resistance
Accuracy at 25C
1Ω
1.0mA 1 - 4Ω ±0.02Ω ± 0.05% * Rdg
4Ω
1.0mA 4 - 40Ω ±0.02Ω ± 0.05% * Rdg
40Ω
100µA 40 - 400Ω ±0.2Ω ± 0.05% * Rdg
400Ω
10µA 400 - 4KΩ ±2.0Ω ± 0.05% * Rdg
4KΩ
10µA 4K - 40KΩ ±20Ω ± 0.05% * Rdg
100KΩ
10µA 40K - 100KΩ ±50Ω ± 0.1% * Rdg
Table 9: 10mV Constant-Voltage Accuracy Specifications
While it is possible to measure resistance above100KΩ, accuracy is not
guaranteed.
The 1.0mV and lower bias settings are provided for use in very low
temperature applications (<~1K) where errors are often dominated by sensor
self heating rather than the accuracy of resistance measurement. In the
1.0mV range, the Model 24C will have an accuracy of ± 0.5% over the
resistance range of 40 to 10.0KΩ.
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