Recently, there’s been some confusion when it comes to calibration and EL-USB series temperature data loggers. The fact that we offer a NIST traceable calibration certificate (sold separately) has led some to believe that a certificate must be purchased in order for the logger to be calibrated. On the contrary, EL-USB series data loggers are calibrated prior to shipment and values are warranted to be within the specifications outlined in their respective datasheets. A certificate is not provided with the unit, however.
Do I Need a NIST Traceable Calibration Certificate?
If you haven’t been told that your measurements need to be NIST traceable, you probably don’t need a certificate. The certificate simply establishes traceability to NIST standards. If you’re unsure, consult with the company/organization that you’re making measurements for.
How Many Data Points?
Assuming that NIST traceability is required, multiple data points can be chosen . Calibration will be performed at each of the chosen data point. The number of temperature points chosen depends on the application. For example, if you’re acquiring temperature values over a narrow range; say 75 to 80°F, you might choose a single calibration point of 77°F (a standard calibration point). On the other hand, if you’re acquiring data over a wide range; say 32°F to 100°F, you might choose to calibrate the unit at several points in between.
Sample EL-USB Calibration Certificate