Differential probe quick tear down  - Page 1
Forum section: electronics / testgear

author: thefamilyman
author_rank: Regular Contributor
timestamp: November 13, 2015, 04:43:35 am
content: Good afternoon gents.Just received my Pintek DP-25 25MHz differential probe from Aliexpress (US$262 incl. shipping).only going to take a quick look inside it.the only minus is that it requires an external power supply as there is no internal batter compartment. i just made up a 9V battery clip and plugs into the DC input socket, only draws 78mA.

author: tautech
author_rank: Super Contributor
timestamp: November 13, 2015, 05:17:07 am
content: Pics of the underside?

author: thefamilyman
author_rank: Regular Contributor
timestamp: November 13, 2015, 05:24:47 am
content: Quote from: tautech on November 13, 2015, 05:17:07 am

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 13, 2015, 05:28:33 am
content: Quote from: tautech on November 13, 2015, 05:17:07 ameevgoogle for you...https://www.eevblog.com/forum/testgear/teardown-pintek-dp-25-differentail-probe/msg169543/#msg169543

author: thefamilyman
author_rank: Regular Contributor
timestamp: November 13, 2015, 05:35:18 am
content: ahh haha i'm an idiot

author: MarkL
author_rank: Unknown
timestamp: November 16, 2015, 08:10:39 pm
content: Quote from: thefamilyman on November 13, 2015, 04:43:35 amThat's a lot of current for a 9V. According to the Energizer datasheet, it will only last about 6 hours before it gets down to Pintek's minimum supply rating of 6V. And once it falls below 6V, there's no telling what will happen to the integrity of the output signal.Not saying it doesn't work, but be wary.Interesting... There seems to be another flavor of the DP-25 that has a "Low Batt" light. Perhaps it was redesigned at some point for battery use. For example:http://www.triotest.com.au/shop/oscilloscope-differential-probes/2303-pintek-dp-40lv-10mv-650v-differential-probe-40mhz.htmlEven Pintek's site is inconsistent within the various documents:http://www.pintek.com.tw/product_detail/landersound/index.php?Product_Site_Classify_SN=17072&Product_SN=19265&Company_SN=6002Given the ambiguity, I wouldn't be sure the 6V minimum (stated on the datahseet) is right for the flavor you have. It could be higher.FYI, if you care.

author: Howardlong
author_rank: Super Contributor
timestamp: November 16, 2015, 08:15:55 pm
content: Quote from: MarkL on November 16, 2015, 08:10:39 pmBateriser compatible then, you'll get a clear 48 hours out of it with one of those. Or 10.8 hours. Or maybe two hours.

author: MarkL
author_rank: Unknown
timestamp: November 16, 2015, 08:51:55 pm
content: Quote from: Howardlong on November 16, 2015, 08:15:55 pmGee, don't you think they could get even more than 48 hours? Certainly their magic marketing calculator needs to take into account the higher starting voltage relative to the fixed drop-out voltage. Oh look! It's found an extra 20%!

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 17, 2015, 05:43:02 am
content: Interesting that it's speced for a 1M load. Does it use a special "scope probe" piece of coax to connect it to the scope?

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 17, 2015, 06:30:39 am
content: Thanks for the teardown, thefamilyman.Quote from: MarkL on November 16, 2015, 08:51:55 pmIt sucks the voltage from batteries across the room!

author: tautech
author_rank: Super Contributor
timestamp: November 17, 2015, 06:45:49 am
content: Quote from: NiHaoMike on November 17, 2015, 05:43:02 amThe DP-25 I have in stock has a double ended BNC cable supplied for scope connection.

author: tautech
author_rank: Super Contributor
timestamp: November 17, 2015, 06:46:55 am
content: Quote from: crispy_tofu on November 17, 2015, 06:30:39 amIt's not designed for battery supply, it comes with it's own 9V wallwart.

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 17, 2015, 11:57:10 am
content: why struggle for battery power supply when you use the device on the bench connected to the mains powered DSO? because you have no more free socket outlet on the wall? its reasonable though if you have portable dso and work on site... 6 hours battery life is acceptable imho, just buy many spare batteries.