Chapter 1. Setting Up the RF ValProbe
RF ValProbe® User’s Manual 11
1.2.3a Temperature Sensors
In order to verify that the temperature sensors in the Loggers are within the 0.1°C
calibration accuracy, the total system measurement uncertainty for the calibration
equipment must be better than 33mK (0.033°C) in order to achieve a 3:1 measurement
uncertainty ratio. The following equipment is required to perform calibration verification:
• IRTD model 400 (25mK). The IRTD 400 (M2801) temperature measurement standard
is a self-contained measurement system providing temperature data directly to the
Kaye RF ValProbe software during temperature sensor calibration and calibration
verification. The measurement accuracy is NIST-traceable to 0.025ºC, with a range of
–196ºC to 420ºC.The IRTD provides a traceable standard that is used to calibrate
Kaye RF ValProbe Loggers and to verify Logger calibration. During the calibration
and calibration verification process, the Kaye RF ValProbe software automatically
reads and monitors the value of the IRTD probe.
Note: During calibration, the IRTD remains connected (via an RS-232C port) to the PC
running RF ValProbe software, and to the temperature chamber or bath. It does
not link directly to the RF ValProbe.
• Temperature bath or chamber with the following stability and uniformity
specifications:
Kaye recommends using the CTR-40 or CTR-80 liquid calibration baths.
1.2.3b Humidity Sensors
In order to verify the RH sensors meet the calibration accuracy specification, the RH
Humidity Calibrator must have an error equal to or better than ±1%. To perform
calibration verification, Kaye recommends a Humidity Calibrator with ±1% accuracy or
better, such as the Kaye Humilab.
Table 1: Temperature Bath (Chamber) Specifications
Bath Stability Bath Uniformity
7mK 7mK
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