Just ordered Aneng MH13 Insulation Resistance Meter. Any comments on the spec

[onlooker]

This is an impulsive buy due to its seemingly low price ($52 after coupons).

I have not used one before and know very little about such meters, but I had always wondered how much the insulation of my various cables aging over the years. Comments are welcome about the specs or price. I will show the stock picture from ali for now. I can show more pictures when I got it.

I also saw ANENG SZ20 (25000 Counts with AC+DCV). It seems to be a new model and could be a competitor to UNI-T 61E+ with only a little over half the price (~$46). I did not buy it for I got too many multimeters already.

[Fungus]

I also saw ANENG SZ20 (25000 Counts with AC+DCV). It seems to be a new model and could be a competitor to UNI-T 61E+ with only a little over half the price (~$46). I did not buy it for I got too many multimeters already.

I was mentioned in the "New Aneng meters" thread a few days ago...

https://www.eevblog.com/forum/testgear/aneng-goes-crazy-with-new-meters/msg4629247/#msg4629247

It doesn't look very accurate for a 25000 count meter - only 0.2% DC accuracy(!) 

[themadhippy]

if it cant measure less than 1 meg ohm on the 500v range im out.

[Tjuurko]

It can also be called "HYTAIS TS68" and "MESTEK IT200G".
There are models for 1KV: "MESTEK IT20G", "ANENG  MH12" and "HYTAIS TS58".

[onlooker]

Thanks for all comments. I just received the meter.

One of the attached pictures shows that the resolution at 500V is 10k. This is not reflected in the manual where under 500V,  the measuring range is listed as 1MΩ to 20GΩ. I guess this 1MΩ is not meant for the resolution.

10K or not, I am not sure about the accuracy, though the number displayed is stable, repeatable and consistent with the trend:
 
  6.1  MΩ at 1000V
  6.65MΩ at  500V
  6.9  MΩ at  250V
  7.36MΩ at  DMM


The other picture shows 19.12GΩ insulation resistance for a thin USB cable at 2500V. I also tested a few other wall power cables, all showed "OL", so I end up testing this USB cable.

Ok, just find out. It does not measure resistors below 1M. The meter showed all zeros and beeped constantly. At 2.2M, the meter showed 2.18M, then also beeped constantly.
 

[indman]

I just received the meter.

Have you opened your device? I got the MH12 model.I don't really need the 2000-2500V range, so I was more interested in the lower limit of 50V. An interesting feature of these models that should be remembered and taken into account is the negative polarity of the output voltage at the "Line" terminal in relation to the "Earth" terminal.Therefore, this feature should be taken into account if you are going to measure the resistance of the arrow device!

[indman]

I also saw ANENG SZ20 (25000 Counts with AC+DCV). It seems to be a new model and could be a competitor to UNI-T 61E+ with only a little over half the price (~$46).

Another 1 model, which is a copy of Aneng SZ20 - ZOYI ZT-225. On Chinese resources
http://www.dt830.com/thread-7298-1-1.html
http://www.dt830.com/thread-7310-1-1.html
you can see the insides of this device.
The main chip is DTM0660L. It is very interesting how they managed to overclock this chip to 25000 counts?

[Bzlsk]

if it cant measure less than 1 meg ohm on the 500v range im out.

This. I need an insulation meter @1000V capable to discriminate under 1MOhm for report.

[Tjuurko]

https://mastech-group.com/na/en/MS5203

Output Voltage: 1000V (0~20%)
Range: 0~200MΩ, Resolution: 0.1MΩ, Test Current: 1mA
Range: 200~1000MΩ, Resolution: 1MΩ

[indman]

I got the MH12 model.I don't really need the 2000-2500V range, so I was more interested in the lower limit of 50V.

Measurement of resistance 1M on ANENG MH12. Quite real readings in the entire declared range.

[Hydron]

I love that it can "Atuomaticaiiy compute DAR PI" 

[sijmen]

Hi,

I'm looking to buy an insulation tester to test single and 3 phase motors and transformers, and in some instances enclosures.  My initial thought was to buy the Aneng MH13 which is capable of up 2500V test.  But the earlier comment from themadhippy about it needing to measure less than 1 MOhm on the 500V range is outside the specs of this meter. 

1.  I'm curious why a low resistance reading is so important when measuring insulation, where I'd normally expect the reading to be much higher?
2.  Considering my use case, would you recommend the MH13 or the cheaper MH12 which only goes to 1000V testing, and if so why?

Regards,
Sijmen.

[themadhippy]

I'm curious why a low resistance reading is so important when measuring insulation, where I'd normally expect the reading to be much higher?

It makes finding faults easier,is that a dead short im reading or just leakage due to something else that will disappear once things get warm,a good example is electric cookers, that on initial inspection can give a lower than expected reading.In the uk we used to allow a reading of >500 K (0.5 meg) ohms for such fixed equipment but that seems to have disappeared and  has been replaced  with 250v test

Considering my use case, would you recommend the MH13 or the cheaper MH12 which only goes to 1000V testing, and if so why

Even if you think your only going dealing with 3 phase systems there's also the control circuitry to consider ,some of that might get upset having 1000v  shoved up it

[neikalo]

Are there any cheap and cheerful insulation testers with a high current (>200mA) low resistance range. This would be for measuring earth bonding connections. Such a feature seems to be lacking on Aliexpress.

[BILLPOD]

I got the MH12 a while ago and I tried measuring MOhm resistors that I have in stock and it was quite accurate.  But I also discovered it doesn't work with rechargeable NimH batteries so I got some primary Lithium batteries and it works great despite the higher voltage, (14.4 VDC from
8 AA cells).

[neikalo]

I am using mine with Eneloop NiMH cells, which seem to work fine. I like the standard white Eneloops.

[mmatic]

Which is better to buy MH12 or MH13?

[neikalo]

MH12 goes down to 50V, which I need. MH13 goes from 250V TO 2500V

[mmatic]

What about resistance range. Is MH12 10G enough??
I'm working in telecommunications where 48V. And I will use instrument for repairs at home so to check house wiring, check transformers, motors,... So mainly 230V. Maybe also 3 phase systems in the future.

MH13
250V: 1MOhm - 10GOhm
500/1000V: 2MOhm - 20GOhm
2000/2500V: 5MOhm - 40GOhm

MH12:
50/100V: 0,1MOhm - 200MOhm
250: 0.4MOhm - 10GOhm
500: 1MOhm - 10GOhm
1000: 2MOhm - 10GOhm

[dshorthill]

MH13 is in stock at Amazon with two day shipping (US).  MH12 ships from China.  Not much price difference between the two models.  I purchased the MH13.  It works flawlessly.  Not a test instrument I really needed, but nice to have..I used it to verify antenna and rotator cables that had been out in the weather.. Confidence to reuse them now.. Happy with the MH13 !

Also tried the UNI-T UT502A Tester.  I bought it first and returned it … Erratic readings.. Flaky..  The MH13 is the keeper.

[GnomeZA]

Has anyone actually verified the MH12 meter?

When in 1000v setting using a differential probe set to 500x I'm seeing no more than 524v peak to peak.
When I measure the AC voltage using a UT61E I'm seeing ~250v peak to peak.

The meter still reads overload resistance while doing this measurement, so I'm not convinced it is because the impedance is too low.

Am I measuring this wrong or is this just blatant lies?

[emg]

Hi
using a UT61E+ I was  able to measure all range of the output voltage correctly, except 1000v.
notice the output is DC not AC ,And a little  higher than what you expect. e.g when you select 500v ,output will be 510v DC.
UT61E+ is able to measure up to 1000v,therefore  start beeping and showing OL on the display, when I try to measure then output voltage while 1000v was selected.
The measured resistance was accurate enough.
check the batteries inside your device and make sure they have enough power.

[csuhi17]

It works fine for me MH13, it measures the 10M resistance correctly, and my other meters agree with this. I have no more resistance at hand now.

I also measured the input of the DMM I have, it read ~10MOhms in both 250V and 500V settings. In Voltage Meter mode, the DMM wrote almost the same voltage as the Aneng.

I took some pictures.
The blue ones have a passive probe with 10x division.
250V and 500V.
The yellow, on the other hand, is with the Micsig DP20003 differential probe in 500x division.
I didn't see a difference between active and passive, at 250 and 500V, so I only share the passive.

If I see correctly, it measures with negative voltage.

[GnomeZA]

It works fine for me, it measures the 10M resistance correctly, and my other meters agree with this. I have no more resistance at hand now.

I also measured the input of the DMM I have, it read ~10MOhms in both 250V and 500V settings. In Voltage Meter mode, the DMM wrote almost the same voltage as the Aneng.

I took some pictures.
The blue ones have a passive probe with 10x division.
250V and 500V.
The yellow, on the other hand, is with the Micsig DP20003 differential probe in 500x division.
I didn't see a difference between active and passive, at 250 and 500V, so I only share the passive.

If I see correctly, it measures with negative voltage.

Thank you for doing a real test and providing the data
I'll go see if either I screwed up or something else is up.
Appreciate it!

[csuhi17]

I see now that you tested the MH12?
I have the MH13, the output looks like this.

Would the operation of MH12 and MH13 be that different?!