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Author Topic: Expectations about cheap Power meters TS-836A & D52-2048 (home use)  (Read 475 times)

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Online Kiriakos GR

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TS-836A & D52-2048 Power meters are both Made in China products, both aiming home users, both close to 10$ mark.

TS-836A this is plug-in type.
D52-2048 this is for mounting over rail.

Both able for power factor measurement, and other electrical parameters.

But here is the catch (trickery) = false advertising.

Only 1% of sellers they do mention that those meters they are exclusively for clean sine-wave and not for measurements of inverter output.
Non of them can measure True RMS and square-wave power. 
Additionally both are tremendously slow, and this translates that they are usable for static loads ( heaters and incandescent light bulb or Air Cooling Fans).

Especially for TS-836A the news here gets worst in the regard of measuring consumption over time.
Due electronics limitations and slow sampling speed, recorded energy this is in huge error.
What will never computed correctly this is energy consumed by Computers power supply, mobile phone chargers, laptop chargers, inverter air conditioner, LED home lights, up to high speed power drills.

 
For me as professional electrician, both of them are toys, but there is a positive side in all this marketing scam.
Currently measurement of Power Factor this is not possible by a large number of handheld multimeter,  power measurements these are somewhat work for dedicated equipment.

I did order one TS-836A for 11 Euro, but I did that by knowing all limitations, and because all that I care for this is  VA , Watt, Power factor of static loads.
Speaking of measurements trust in static loads, I can accept 2% error, and therefore just for comparison purposes this TS-836A it does not considered as total waste of money.

     
True power meters they have sampling of 100ms and not of 500ms ( two times per second),  as they have these cheap power meters.
100ms sampling translates to ten measurements in the unit of time ( 1 second), therefore any energy variations they are better recorded (more accurate measurement).
But because cheap ones are not able for True-RMS this translate to huge error despite sampling speed.
http://en-us.fluke.com/training/training-library/measurements/electricity/what-is-true-rms.html
 
Speaking of pricing of true power meters (panel type) they hover at above 450 Euro mark, and them are far more reliable speaking of energy recording ability over time.

   
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Online Kiriakos GR

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Re: Power meter TS-836A unboxing & quick testing (not a review)
« Reply #1 on: February 24, 2017, 12:45:12 PM »
This is gadget all ready in the hands of millions of people, and not that complicate so this to justify any in-depth review.

But they are a few undocumented details.

Time clock measuring consumption over time this is working only if loads stay at 2W or above, and not at lower loads.
This detail possibly translates that many cellphone chargers consumption this will not be recorded.

Speaking of measuring speed,  from 300W loads switching to 150W, ammeter mode requiring 18 seconds to actually display real value, this stays still for 10 seconds and in another 10 seconds trying to stabilize to real value.
Voltage measurement acting the same as ammeter does.
Power factor accuracy unknown.
Operational voltage range with displayed measurements :  90 ~ 270 ACV ( Tested by Variac transformer )
Watt calculation error: about 4% with halogen lights ( for LED and switching power supplies or motors you should expect much higher) 

 
I got few pictures just for demonstration of operation,  this is not any review, if it was I would take pictures in proper sequence about aiming an measurements ( accuracy )  comparison.
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Online Kiriakos GR

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Re: TS-836 User manual / instructions manual PDF files Download
« Reply #2 on: February 24, 2017, 11:09:16 PM »
In order to help any lost souls  :) 

I am hosting two pages of TS-836 User manual / instructions manual.
Two attachments below.

(Download Links are available ONLY to forum members)
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