Yokogawa 700926 30MHz Isolator mini teardown - Page 1
Forum section: electronics / testgear

author: gamalot
author_rank: Super Contributor
timestamp: April 13, 2017, 07:14:00 am
content: There are two PCB boards inside - analog and digital - I didn't removed the digital board because I think there is nothing interesting.

author: gamalot
author_rank: Super Contributor
timestamp: April 13, 2017, 07:20:16 am
content: Shield removed.

author: gamalot
author_rank: Super Contributor
timestamp: April 13, 2017, 07:21:48 am
content: Non-Isolated section.

author: gamalot
author_rank: Super Contributor
timestamp: April 13, 2017, 07:25:04 am
content: Finally, the front panel.

author: BravoV
author_rank: Super Contributor
timestamp: April 13, 2017, 07:44:07 am
content: Thanks for the teardown, you made me wet my keyboard with saliva.Btw, where can I find this product user and/or service manual ? Curious on it's specification. My google fu failed me.Similarly I just scored similar tool recently, its a Tektronix probe isolator, its ancient one with 20 MHz BW, and compared to yours, its like night and day, mine is sooo huuuge, yours has much better size & nicer interface.

author: gamalot
author_rank: Super Contributor
timestamp: April 13, 2017, 07:51:37 am
content: Quote from: BravoV on April 13, 2017, 07:44:07 amI spent some time looking for the documents of this instrument, but I what I have found was only one page of specification.

author: HighVoltage
author_rank: Super Contributor
timestamp: April 13, 2017, 07:54:42 am
content: What a nice instrument. You got very lucky in finding it.Congratulations and thanks for the tear-down.

author: tautech
author_rank: Super Contributor
timestamp: April 13, 2017, 09:18:13 am
content: Pretty cool unit, thanks for sharing.Input, isolation and inter-channel specs are similar to the Siglent ISFE but your BW is 30x better.Looking at the datasheet I presume you use the scope set to 501V/div and then use the attenuator in the Yokogawa, right ?Look forward to seeing some shots of it being used for a project.

author: nctnico
author_rank: Super Contributor
timestamp: April 13, 2017, 09:39:56 am
content: I'm surprised it doesn't have any safety ratings. Without those I'd rather not use it for mains voltages.

author: joeqsmith
author_rank: Super Contributor
timestamp: April 13, 2017, 11:42:45 am
content: Quote from: nctnico on April 13, 2017, 09:39:56 amIt does show 100V max.Slight additionAfter I read the datasheet... Imagine, you have your switchable 1X 10X probe hooked to it and you make a little mistake. Personally, I would have no problems using it with something like the Keysight U1561B probes.

author: gamalot
author_rank: Super Contributor
timestamp: April 13, 2017, 12:42:20 pm
content: Quote from: tautech on April 13, 2017, 09:18:13 amMy scope doesn't have 50 ohm input, so I use a terminal resistor. The vertical scale should be 100 mV/div because of the output voltage on 700926 is 1V peak to peak.

author: gamalot
author_rank: Super Contributor
timestamp: April 13, 2017, 12:53:39 pm
content: Quote from: joeqsmith on April 13, 2017, 11:42:45 amIt is supposed to work with 700929 10:1 isolated probe which is really hard to fine one.I do agree with you on using Keysight U1561B but I think it must be very expensive.

author: BravoV
author_rank: Super Contributor
timestamp: April 13, 2017, 01:26:57 pm
content: Yeah, that BNC input even though is isolated type, can be dangerous for those who unaware as its popular BNC shape.My Tek probe isolator came with a proprietary connectors with the probes (large one) thats rated at 3000V/channel at 600KHz that is UL certified, making it max 6000V at channel differential.

author: bitseeker
author_rank: Super Contributor
timestamp: April 14, 2017, 05:51:28 pm
content: Quote from: gamalot on April 13, 2017, 12:53:39 pmAh yes, 10:1 probe. That's why the spec sheet says "max. voltage input (between probe tip and reference terminal) +-850 V". A slip of a switchable probe would certainly ruin your day.