Leading test and measurement instruments specialist TechRentals
helps customers with test equipment as well as advice for specific applications.
TechRentals recently supplied measurement equipment to a customer who had engaged an air-conditioning engineer to investigate the efficiency of an air-conditioning system and help determine whether upgrading was required.
Five temperature channels, one of pressure via a 4-20mA transducer, and six AC current channels were required to be measured and recorded. TechRentals supplied a Hioki 8841 waveform recorder, which accepts thermocouples, 4-20mA signals, and also DC voltages to record the data while the Hioki 3284 true RMS clamp on current transducer was a convenient solution for the AC current channels.
A data logger would have been an alternative solution with the advantage of remote communications and long term trend analysis. The DataTaker DT80 logger sampling at 1Hz would have met the need, again requiring clamp on current transducers.
The memory recorder showed a significant power factor error with the AC waveforms having a very high harmonic content. True RMS measurements of the rental instruments were significantly different and accurate than the average sensing general purpose AC meter used by the client.
TechRentals offers a range of test and measurement equipment for electrical and air conditioning applications for rental periods as short as one day to a year or more. Rental purchase plans are also available.