Converting a Bench Scope into a portable scope.  - Page 1
Forum section: electronics / general

author: chinoy
author_rank: Regular Contributor
timestamp: April 07, 2022, 11:05:18 am
content: So I got my new Hantek DSO5102PFor the past 10 years I have managed with a portable Fluke 105B Scope.That thing was super portable. And I mad a lithum Ion bat pack for it. That allowed me to run it for days without a power source.I have seen the videos on how to hack the Hanteck and there seems to be tons of space in there for a bat.Anybody else thought off doing this mod ?.I guess a good starting point would be a schematic or diagram for the Hanteck Power supply.i.e. what voltages the unit needs to work. Then I can think about building a bat pack and if required circuit around it.I often work on cars and at remote locations and tracks with no power so this new scope being portable would be a huge plus for me. THe other option is to use a d/c convertor i.e. you plug it into the cars lighter and it puts out 220 volts a/c.Any help with this would be much appreciated. I could allways just open up the scope and create a schematic. But it would consume a lot of time.I am searching on various forums also.

author: chinoy
author_rank: Regular Contributor
timestamp: April 07, 2022, 01:19:10 pm
content: I found this info So far.PSU5= 4.9 -> 5.2V (4.98V, 0.5A DSO/MSO,+0.5A forUSB)PSU+9= 6.5 -> 9.0V (6.49V, 300mA, upto 450mA during boot !!!)PSU3.3= 3.2 -> 3.3V (3.15V, upto 1.4A (DSO) and 1.8A (MSO))PSU-9= -6.5V -> -9.0V (-9.37V, upto 200mA)PSU15= 14.0 -> 15.5V (15.95V, uptp 100mA)

author: tom66
author_rank: Super Contributor
timestamp: April 07, 2022, 01:22:40 pm
content: I found that my Rigol DS1074Z would run off approximately 50V DC on the AC connector without any issues. I built a little boost converter box that would run from the cigarette lighter in my car, that way I could power the scope with the ignition on.This worked absolutely fine & the scope pulled about 11W from this (so you could probably run for 4-5 hours with a suitable battery pack.)I can't promise it won't overstress the PSU as the PFC stage will be pulling more current but it didn't appear to show any issues running for a few hours like that.

author: tggzzz
author_rank: Super Contributor
timestamp: April 07, 2022, 01:37:04 pm
content: Think about what you are connecting it to.In a normal scope, the probe's shield is connected to the protective mains earth via the scope's chassis. If the probe's shield touches a dangerous voltage, a fuse should blow.If you remove the PME, the chassis will be at whatever voltage the probe shield is connected to, and fuses won't blow. Obviously that could harm the operator, and it can also damage the scope's power supply.

author: tom66
author_rank: Super Contributor
timestamp: April 08, 2022, 07:32:16 am
content: Quote from: tggzzz on April 07, 2022, 01:37:04 pmThis is only an issue if you actually intend to probe dangerous voltages. What if OP wants to measure their Arduino circuits when away from a mains power supply? Or as they say, they work on cars a lot, so as long as they don't probe the ignition coil of an old truck, they should be OK with the lack of isolation a normal mains scope presents.

author: tggzzz
author_rank: Super Contributor
timestamp: April 08, 2022, 08:36:58 am
content: Quote from: tom66 on April 08, 2022, 07:32:16 amThat's why I started the post with "Think about what you are connecting it to".

author: nctnico
author_rank: Super Contributor
timestamp: April 08, 2022, 10:26:14 am
content: Quote from: chinoy on April 07, 2022, 11:05:18 amThat would be a good option in your situation. 50W may be all you need (check the specs of your scope) and likely it is cheaper compared to buying parts to make something yourself.

author: chinoy
author_rank: Regular Contributor
timestamp: April 10, 2022, 11:38:42 am
content: Using the cars bat direct d/c with a buck boost sounds like the best idea so far. Though I lack the courage to hook up 50v DC direct to the a/c in.It does simply providing individual voltages to each power rail for sure.Na not going to use a scope to chk anything to do with the ignition.Most time we are just wanting to chk the signals from the cam position sensor and the crank position sensor. And injector pulse widths. Any other job you can do with a regular multimeter.Also maybe if you cant to calculate ignition delay.BTW any of you guys used the automotive probe. Made by hantek.Im thinking of first understanding how it works and then maybe building my own. Its a 100$+ part.From what I see. I could just use the pickup from an old timing gun i.e. ferrite core with copper wire winds to achieve the same results. They make some big claims for the probe i.e. it can tell you the condition of your plugs lol.