Cal Test CT2700 40kV HV DMM Probe - Thoughts? - Page 1
Forum section: electronics / testgear

author: reject902
author_rank: Newbie
timestamp: March 24, 2016, 10:51:22 pm
content: Hey everyone,Was wondering if anyone here has ever used the Cal Test CT2700 40kV HV DMM Probe (link:http://www.tequipment.net/CalTestCT2700.html?search=true) and/or what your thoughts of it were quality wise.I'm picking up a HV probe for some CRT work, and the price on this probe is less than half that of it's well established Fluke counterpart. No reviews on TEquipment, but Amazon has 4 reviews, each 5 stars. It also includes the flat CRT tip for probing the anode, which makes it an even more convenient buy for me.Since there's some serious voltages at play, I'm interested to hear any thoughts on quality before poking around with one of these.Thanks

author: tautech
author_rank: Super Contributor
timestamp: March 25, 2016, 03:20:52 am
content: Quote from: reject902 on March 24, 2016, 10:51:22 pmCRO's or TV?

author: reject902
author_rank: Newbie
timestamp: March 25, 2016, 03:26:59 am
content: Quote from: tautech on March 25, 2016, 03:20:52 amCRT monitors actually.

author: AlienRelics
author_rank: Unknown
timestamp: March 06, 2018, 07:59:57 pm
content: In two years, nobody?I was considering this probe, too. Doing a variety of high voltage experiments. I have some older probes that have much lower input resistance.Either this at 1G ohm, or I build one using a couple of 5G ohm resistors to get even higher resistance.

author: PartialDischarge
author_rank: Super Contributor
timestamp: March 06, 2018, 08:41:04 pm
content: Quote from: AlienRelics on March 06, 2018, 07:59:57 pmWell, be advised that the higher you go on the resistance the lower the bandwidth gets. And in this case it means that higher frequencies will show up as higher measured values not lower. It also depends if you can get along with a DMM probe or you need an oscilloscope probe

author: nidlaX
author_rank: Frequent Contributor
timestamp: March 06, 2018, 08:58:45 pm
content: This looks basically identical to the Pintek / Tenma, so I'm sure it's fine for the price and purpose it's designed for. Search HVP-40 for more info.

author: tautech
author_rank: Super Contributor
timestamp: March 06, 2018, 10:00:05 pm
content: Quote from: nidlaX on March 06, 2018, 08:58:45 pmYeah, it's a generic model # rebranded by a few.Quote from: AlienRelics on March 06, 2018, 07:59:57 pmHave a look at Pintek's site there's a few models to select from.http://www.pintek.com.tw/Last order from them I got a HVP-08 (8KV) for my own use and it HF compensates just fine on a 3V p-p 1 KHz probe comp signal.Member Defpom had a look at it in this vid:

author: AlienRelics
author_rank: Unknown
timestamp: April 19, 2018, 09:11:52 pm
content: I have a 1000 to 1 scope probe, although I don't recall the maximum voltage on it.For my purposes, I will be using this as an adapter for a DMM for DC and for 60Hz AC, so bandwidth shouldn't be an issue.

author: tautech
author_rank: Super Contributor
timestamp: April 19, 2018, 09:25:27 pm
content: Quote from: AlienRelics on April 19, 2018, 09:11:52 pmAll scope probes come with a pamphlet, have you lost it ?It will have the max voltage listed and more importantly a frequency derating curve.The trap with a scope probe is the reference (gnd) lead doesn't provide the same operator safety as the probe itself so use it with care and only connect the reference lead when the DUT is powered down/OFF.

author: AlienRelics
author_rank: Unknown
timestamp: April 20, 2018, 06:44:05 pm
content: Never had the manual for the scope probe. Bought it at a thrift store. I looked up the specs at one time, however I'm just on my lunch at work so I can't post the make and model right now.Good tips about safety and high voltage.