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AC or DC Electrical Energy related topics => Bench-top Single Phase Power Meter => Topic started by: Kiriakos GR on December 20, 2025, 02:27:19 PM
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I was after testing the software of my AC single phase power meter, at generating a printed report.
There is a ready made form, that the test engineer he should add also environmental details.
And I have to admit that I was forced to ask AI assistance about that educational subject. :)
This report has a field this named as Testing environment:
Included parameters Tx Ti and RH.
Tx and Ti these are temperature values, and now I gained the awareness that they named as notations and they come from industrial process control.
Tx = or more commonly TT (Temperature Transmitter), is a device that measures the temperature via a sensor (TE, Temperature Element) and converts the signal into a standard output (e.g., 4-20mA) that can be sent to a remote control system or control room.
Ti (Temperature Indicator): A TI is a passive instrument that provides a local, visual display of the current temperature at a specific location, such as on a pipe, wall, or canal. It simply shows the temperature to an operator who is physically present.
Example:
The notation Tx: 25℃, Ti: 25℃ indicates that:
The local display (Ti) shows a temperature of 25°C.
The signal being sent to a control system (Tx/TT) is also indicating a temperature of 25°C.
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In meteorology and physics, RH% stands for Relative Humidity, expressed as a percentage.
It measures the current amount of water vapor in the air compared to the maximum amount the air could hold at that specific temperature.
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The new question this is of why, all these detailed information's, they should be submitted within a Power Efficiency Testing report?
In theory, and regarding electrical test and measurement instruments, measurements validity this is warranted when testing this is performed at 22 Celsius.
Electrical measurements, calibration inspection, calibration adjustment, everything it should performed at controlled environment at 22 Celsius.
I can only imagine or speculate, if testing this is not possible at a controlled environment, then these additional notations they might explain at the reader, that there is a portion of measurement error, this relative to atmospheric conditions.
Indeed even these AC single phase power meter, they do come with measurement error specification.
On a second thought, all these additional notations, they might not helping in the regard of measurement accuracy, but regarding measurement repeatability.
Measurement repeatability this is warranted only if a specific (calibrated) instrument, this will test the load, at identical environmental conditions.
Now we can see the entire picture ..
Product model: PM9913 (AC power meter)
Product number: Serial number (AC power meter)
Tx 22C
Ti 22C
RH 40%
The sum of these information's, they have to do with the Testing environment and measuring equipment in use. ;)
Attached sample !