Proving units maximum voltage

[Ziggie]

I decided,having lived with using a live circuit, to buy a proving unit. I opted for a Kewtech Prove 4 which covers 5 voltages between 690volts and 50 volts. The device starts at 690 volts which is ok for my Megger 2 pole tester. My fluke clamp meter has a limit of 600 volts. The second problem is that the unit spends only seconds in the low voltage ranges and it’s too fast to check the readings easily in these ranges.

Has anyone used this device with testers that have lower limits than the 690 volts ?

 

[Ziggie]

I emailed Kewtech and they stated that it does cascade up the voltages before cascading down. While this wasn’t what happened initially, it is doing that now and I don’t know what changed!

 

[DPG]

I emailed Kewtech and they stated that it does cascade up the voltages before cascading down. While this wasn’t what happened initially, it is doing that now and I don’t know what changed!

Strange - my kewtech starts at 690V, then after about 4 seconds it steps down to cover each band. Once all the voltage bands have been covered it tests the continuity function

 

[stevethesparks]

Don't give too much info her, the cynical side of me says there will be new updates on MFT's to incorporate the higher voltages of test units

 

[Ziggie]

Strange - my kewtech starts at 690V, then after about 4 seconds it steps down to cover each band. Once all the voltage bands have been covered it tests the continuity function

That's what my did but when I e to video it itvran upwards from 50 to 690 and rhen back down.

I found the following on Testerman’s web site
The Kewtech Kewprove 4 Proving Unit is a portable battery-operated unit capable of verifying the correct functionality of a voltage tester. Kewprove 4 Generates five stepped nominal output voltages from 50 to 690 volts.

When the Kewtech Kewprove 4 Proving Unit is turned on it first generates 690 volts, then slowly goes down through each voltage step until the device turns off

I see that the site notes that the device is discontinued. I hope it's not because of safety issues.

 

[stevethesparks]

Despite my sarcastic post, I've only ever considered using a voltage tester with a proving unit rather than an MFT