Calibrating your transformer turns ratio test set (TTR) is extremely important. Like many other measuring devices, TTRs are prone to drifting. For this reason, TTR calibration should be performed in set intervals to ensure the overall accuracy and reliability of your instrument.
Because a TTR works with high voltages and electricity, it is vital that the instrument is working properly and precisely for guaranteed safety. To assist you in setting a TTR calibration interval, we have created a set of guidelines to help you determine when your TTR should be calibrated and why.
BASED ON THE MANUFACTURER’S RECOMMENDATION
Most TTR manufacturers will recommend a timeframe of when you should calibrate your TTR. While this recommendation is useful and should be used when setting an interval for your TTR calibration, it should be noted that this should not be the only factor used to determine if and when to calibrate your TTR. Many other factors play into TTR accuracy and reliability, therefore, the manufacturer’s recommendation is a great place to start, but it should not be your intervals determining factor.
BASED ON THE AMOUNT OF USAGE
This factor is the key to setting a TTR calibration interval. This is because the amount you use your TTR will determine how quickly it drifts. For example, if you use your TTR every day with high voltages, chances are your TTR will drift quickly, therefore, TTR calibration would need to be performed monthly. If you only use your TTR every once in a blue moon, then you most likely will only have to calibrate bi-annually.
Other factors that play into calibration frequency include:
If the instrument was knocked over, bumped or had fallen, this would cause a drift.
If a piece of equipment is not stored properly, the accuracy could drift. For example, if an instrument should be kept in an environment without humidity, but is left in an non-air conditioned room on a hot day, it could affect the accuracy. It’s important to remember that temperature and humidity play a big role in accuracy of measurements.
AGE OF THE INSTRUMENT
If an instrument is new, it should be calibrated before use. If an instrument is very old, it should be calibrated regularly to ensure it is measuring properly and precisely
What else should you be aware of when it comes to calibration of TTR?
Read our full guide.