Uni-T UT501A Insulation Tester Review & Teardown - Voltlog

[@chefbink61]

I have one of these testers and it's really very handy to have in the shop. I build a lot of audio amps and also do re-caps of vintage audio and such and I always use it to test the mains side before and after just to make sure it's safe to plug in. I think they are really a must have for anyone that builds or repairs anything that plugs into the main.

[@benbaselet2026]

Good for testing those leaky old caps too!

[@chefbink61]

@@benbaselet2026 yup they are. I have an old Elco Cap Leck tester but this will do a good job as well.

[@andrelange9877]

I love reading this kind of comment about safety checks. In my country if there is a leakage or short between mains and equipment chassis and someone gets electrocuted, general public and media will think it's the user fault for not wearing slippers while operaring the electrical appliance. Also most places have no earth wire. If someone get shock they'll try reversing the plug then consider it fixed and safe. Please come here and teach our engineers and technicians.

[@jp040759]

Have you ever used this tester to test MOVs to find their actual voltage trip threshold. I was considering getting one for these for that purpose. I think it would be possible to use it for testing reverse voltage breakdown of rectifiers also. The 1 milliamp current limit should eliminate catastrophic failure of the devices under test. Your thoughts would be appreciated. THANX

[@nightmoon90]

Hello why this resistanse tester on 250V show 5Gohm resistanse and why yo need to have switch on 1000V to have info of short circuit? Why don't show this short curcuit also on 250V 🤔 Short circuit that's short circut 🤔

[@radiotvrepair1059]

I have an insulation tester when measuring the voltage exceeds the setpoint for example if I set the voltage to 250v this voltage rises to 1000v. you can help me and thank you in advance

[@valamilamasag]

"Without additional import charges in the EU". This depends on the country. Sadly this is not the case in Hungary, we don't have to pay the VAT twice if the seller pays it but we do have an additional "handling fee" of around 1,5€ (realistically 3€) to ~15€ depending on the value of the package and how you pay it (before you receive the package or at the post office when receiving the package).

[@voltlog]

I would understand an extra fee if they had to do something extra, like process & collect VAT/import charges, but if VAT is already collected why charge an extra fee?

[@matmay]

@@voltlog to check if the vat has already been payed ;-)

[@payambagheri8854]

thanks .... I like UNI-T , one of the better brands in China . I use their products in my lab and they are pretty good

[@mortenlund1418]

They do a good job of making robust products. For an electrician Uni-t is a pro product. The price do not reflect the quality. I have been beating a Uni-t multitester daily for 5 years, it still works flawlessly.

[@payambagheri8854]

@@mortenlund1418 fully agree with you. Appreciate your feedback. I bought a higher voltage version UT513-A recently which goes upto 5Kv and it is really nice.

[@mortenlund1418]

@@payambagheri8854 Hello. I wonder if you would care to mention which other Chinese brands that are to consider as an electrician? Just because right now I only consider UNI-T when shopping electrical meters.

[@payambagheri8854]

@@mortenlund1418 I am using "Applent" and "Anbai " instruments for precision measurments in my lab and they are very reliable too. you may consider those brands.

[@waynegram8907]

VOLTLOG, can you give a bunch of examples of testing and measuring Insulation resistance? I don't know what I would use to test the insulation resistance out of what piece of gear or circuit board can you give a bunch of examples?

[@electronic7979]

Nice review video

[@ghostridergr8259]

i need only for electric motors... 1 - 100 hp .. and use it not so offen.... is it good ??

[@tabasumcarpentry5336]

hi sir can an insulation tester detect wires if the wire's insulation is cracked but not touched each other. like some old cables' insulation cracked and the cooper conductor exposed but not touching each other?

[@muhammadawais7288]

thats what he should with that torn insulation. At 250v it was ok and on 1000v it was arcing

[@MaN2Mega]

Is this meter appropriate for automotive work? In the 12V system

[@UKsystems]

As it clearly shows it uses high voltage for insulation resistance. This is because on domestic electric installations in most developed countries you have to check them with high voltage with a meter before you technically may be able to be used in a car but you have to disconnect all the 12 V load so don’t cook, and it may damage the insulation as it’s only rated for low voltage know the cables rated for hundred volts you could

[@ErwinGallano-i7e]

How much that uni-t insulation tester

[@benjaminroos7746]

Can this unit be calibrated ?

[@UKsystems]

Probably not as it costs less than a calibration would usually cost but it’s important to know that if you test it on a known thing such as resistors that you have checked on other meters is not going to drift very far but remember if it’s in mega homes it could be quite a lot off and still be okay

[@ashvanbro9329]

Best installation tester use on main consumer units and all circuits

[@UKsystems]

Actually, for consumer units for UK only calls them if you know the regulations you have to do a lot more tests than just insulation resistance

[@Dog-whisperer7494]

The uni-T range of testers are a good first tester for apprentices although the UNI-T 526 ? Multifunction tester is a better choice and a fantastic tester Great review mate 👍⚡️

[@seahawk_dk]

Nope, the 0.5 M ohm is the minimum required isolation to pass the isolation test at 500V, 1M ohm at 1000V

[@Dog-whisperer7494]

Wrong, minimum insulation resistance is > 1meg ohm . I. 5 is the minimum the reset can read and the maximum is >300 Meg ohm on the 500v 250v 100v range .

[@seahawk_dk]

@@Dog-whisperer7494 It seems that there is different standards, with greetings from an electrician, 0,4 M ohm, is acceptable minimum if you measures om rubber cables

[@czarusblitzKce]

Regulations and standards define the voltage we measure and the results that must be obtained to meet the minimum requirements. In general, the test voltage should be close to the rated voltage of the tested object. As for the results, they can be divided into electrical devices and electrical installations (wires and cables). Different results according to standards apply to devices, and different ones to installations.

[@kutacaneteknik]

Ok

[@MickDownUnder]

Uni-T junk

[@vladvostok9893]

Loslos nimo dong...

[@UKsystems]

Units are good enough if you don’t want to I really expensive stuff expensive stuff for daily use all the time it’s worth it but this is good for when you don’t need to use it that much or you may be needing extra test sometimes

[@ErwinGallano-i7e]

How much that insulation tester