Products > Test Equipment
Searching for some precision mains power meter (0.1mA)
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jonpaul:
We have amny Charke Hess 255 HF watmeters, and the Yokogawa WT110.

None can do what the OP asks.

The reason is   leakage currents and stray capacitances, its not practical to get a  sub milliampere  50/60 Hz  mains current measurement.

Read the CH 255 and Yokogawa specifications.

In decades of power work I never had to measure less than a few watts load.

At 120V 1 W will be 1/120 A = 0.8 ma = 800 uA.

What is the OP trying to accomplish?

Jon
kripton2035:

--- Quote ---What is the OP trying to accomplish?
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measuring the consumption of small IOT devices that are mains powered.
some are switching power loads like motors or heating elements, so there can be some Amps flowing through.
when idle (no power element is on) they consume less than 5mA.
jonpaul:
bonjour cher Monsieur
The current is easy to measure with a sensitive AC ammeter, low range DVM. as the main voltage is fair stable, just multiply by 240, 120 for watts.

We use Fluke or similar DVM, lowest AC current or Keysight 34465a.

Alternative make a current senses series shunt, 1,10, 100 ohms.

Just measure the voltage drop.

Keep load off so the meter sees only the standby current.

Easier to just get the spec of the device

Bon chance

Amicalement

Jon
kripton2035:
thanks, I know I can measure this with one or 2 DVM. I am searching for a small factor module (like the pzem-022 above) to do this
and installing it permanently on my bench.
just for fun I asked chatgpt about this ...

--- Quote ---looking for a power meter module like the pzem-022, but with more current resolution
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--- Quote ---
There are many power meters available on the market that offer higher current resolution than the PZEM-022. Here are a few options:

The PZEM-042 is a power meter that offers a current resolution of up to 100mA.
The PZEM-061 is a power meter that offers a current resolution of up to 50mA.
The YHDC SCT-013-000 is a power meter that offers a current resolution of up to 1mA.
The Eastron SDM630-Modbus is a power meter that offers a current resolution of up to 1mA.

It's important to note that the current resolution of a power meter is just one factor to consider when choosing a power meter. Other important factors to consider include the accuracy of the meter, the range of currents and voltages that it can measure, and the communication interface it uses (if any).
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impressive ... even if not completely true...
BeBuLamar:
I have a couple of meters that can measure in the 5A range with resolution of 0.1 mA but the accuracy is no where near that good. I wonder what kind of application that you would need such precision. After reading all the posts I see the OP wants to measure power consumption when the IOT device is idle. If the OP power the device by 220V mains why should a few mA matter?
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