Author Topic: Can this high voltage panel meter meet its specs?  (Read 1041 times)

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Offline TracelessTopic starter

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Can this high voltage panel meter meet its specs?
« on: December 28, 2024, 09:02:52 pm »
Hi everyone,

I've recently stumbled upon high voltage panel meters like this one for instance (picture linked below). There are three versions rated 1, 2 and 3kV. (The silk screen even states 5kV). The meter uses a 3-wire JST connector, 2 wires are used for the 5V supply the third is supposed to be the sense wire. The insulation on most JST cables I've seen is only rated for 300V, I also have my doubts that the connector is safe at 3kV. Is this dodgy or am I missing something?

Cheers Traceless.

 

Offline Zoli

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Re: Can this high voltage panel meter meet its specs?
« Reply #1 on: December 28, 2024, 10:03:11 pm »
The connector looks like is from the XH(originally JST) series, which is rated for 250V - so the answer is NO.
 
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Offline tunk

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Re: Can this high voltage panel meter meet its specs?
« Reply #2 on: December 28, 2024, 11:18:12 pm »
No expert, but you may also look at:
- voltage rating of the resistor(s)
- electrical isolation between high voltage and the
  5-12V supply (maybe not a problem using a 9V
  battery)
 

Offline bdunham7

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Re: Can this high voltage panel meter meet its specs?
« Reply #3 on: December 28, 2024, 11:24:30 pm »
What specs?  Do they give any?
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 

Offline tooki

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Re: Can this high voltage panel meter meet its specs?
« Reply #4 on: December 28, 2024, 11:41:38 pm »
That looks quite questionable to me. I suppose that if they removed one of the pins, then in theory they are juuuuust barely meeting the 1mm/kV rule of thumb, but that makes no allowances for any contamination, humidity, or anything.
 
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Offline TracelessTopic starter

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Re: Can this high voltage panel meter meet its specs?
« Reply #5 on: December 28, 2024, 11:52:51 pm »
What specs?  Do they give any?

Well they kinda give some specs below the picture you have "Customer reviews" and right next to it "Specifications", not that it helps much but here is what the specification box says.

Quote
Description
Report Item
DC 0-1000V 2000V 3000V 4bit high precision voltmeter digital display high voltage voltage meter 0.36 Inch 4 bit LED
Technical parameters
Measuring range: 000.0-999.9V / 0000-2000V /0000-3000V
Internal resistance: 10M Ω/ 20M Ω/30M Ω
Operating temperatur e : -10℃~60℃
Working voltage: DC5-12V *1
Working current: <20mA
Measurement accuracy: 0.5%(+/-2)*2
Measure the impedance: 20MΩ
Refresh rate: 3 times/second
The net weight: 23g
Display mode:4 bit 0.36 inch LED
Display color: Red, blue and green can be purchased
Overall dimensions:48MM*29MM*21MM(L*W*H)
Opening size: 45.5mm*26.5mm
Lead wire length: 13CM
Wiring method: black public negative pole, red instrument power supply, white measurement port
*1:The instrument can work in dc4-28v, but it will be hot when it is above 12V and reduce the accuracy and life. Please use 5-12V power supply.
*2:In the worst case, the error is no more than 6mV. In general, the error is about 2mV.

That looks quite questionable to me. I suppose that if they removed one of the pins, then in theory they are juuuuust barely meeting the 1mm/kV rule of thumb, but that makes no allowances for any contamination, humidity, or anything.

Yeah that was my thought as well. Originally I was actually more worried about the JST-cable than the connector TBH. Somehow the voltage source needs to be connected to the port. I guess you could put additional heatshrink around at least that should only break down at 600V+. However if Zoli is correct the connector seems to be the weak link indeed with a 250V rating.
 


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