Re:Re:Show us your homemade Test Equipment

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27 Mar 2021 19:05 #47840 by Wightscope
Replied by Wightscope on topic Show us your homemade Test Equipment
My guess was that they are dumb units passing on whatever they received for authorisation by the KVM.
A cheap 433 receiver from ebay is next stop , but I do like to re-purpose OEM kit !

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01 Apr 2021 09:54 - 01 Apr 2021 09:55 #47899 by Wightscope
Replied by Wightscope on topic Show us your homemade Test Equipment
So for the princely sum of about $6 I got a 433Mhz receiver off ebay. Hooked it up to 5v and the scope;



Peugeot Key (single block of transmission)


Jag Key (3 blocks transmitted)
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19 Apr 2021 21:11 #48311 by John Curtis
Replied by John Curtis on topic Show us your homemade Test Equipment
I’ve got a whole list of things to develop and make. So far this is it.

Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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20 Apr 2021 21:03 #48326 by Noah
Replied by Noah on topic Show us your homemade Test Equipment

I’ve got a whole list of things to develop and make. So far this is it.

Those look great!

-Seems to me that I could live my life, a lot better than I think I am.
I guess that's why call me The Working Man.-

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22 Apr 2021 14:38 - 23 Apr 2021 21:55 #48340 by John Curtis
Replied by John Curtis on topic Show us your homemade Test Equipment

I’ve got a whole list of things to develop and make. So far this is it.

Those look great!


Thanks. Just tuned everything in and fixed the flaws going forward that were in the initial sets. The initial sets are functional but a tiny bit out of square during production. Figured I’d make a holder for them that can double as a way to hold my test leads.
Unfortunately I’ve got about 4 sensors that aren’t perfect visually but have the same functionality.

Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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22 Apr 2021 23:00 #48360 by AJeep18
Replied by AJeep18 on topic Show us your homemade Test Equipment
[quote=

Unfortunately I’ve got about 4 sensors that aren’t perfect visually but have the same functionality.[/quote]

PM sent

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23 Apr 2021 14:32 #48367 by John Curtis
Replied by John Curtis on topic Show us your homemade Test Equipment

[quote=

Unfortunately I’ve got about 4 sensors that aren’t perfect visually but have the same functionality.


PM sent[/quote]

Responded.

Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.

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25 Apr 2021 12:58 #48411 by Tyler
Replied by Tyler on topic Show us your homemade Test Equipment




But seriously, what's your PayPal?
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25 Apr 2021 17:00 #48418 by John Curtis
Replied by John Curtis on topic Show us your homemade Test Equipment




But seriously, what's your PayPal?


I’ll PM you.

Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.

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29 Apr 2021 13:19 #48489 by Tyler
Replied by Tyler on topic Show us your homemade Test Equipment

I’ll PM you.


No I'll PM YOU!

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30 Apr 2021 12:08 #48511 by AJeep18
Replied by AJeep18 on topic Show us your homemade Test Equipment
Going off some of the ideas here, I decided to “mod” my test light. Added an insulated female spade terminal to the end and then male ones the the end of the attachments I wanted, I think it worked out pretty well! And no need to have 3 different test lights with different ends!
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30 Apr 2021 12:50 #48514 by Wightscope
Replied by Wightscope on topic Show us your homemade Test Equipment
Nice !
I have been using stackable banana plugs - effectively both male and female so one on the test light one on the earth clamp and all my probes also fit so I can alligator or probe for a jumper.
Also got a 10ft double ended retractable reel that has two wires, one I put stackable bananas on each end, others are alligators.
Just made a cable today for using a phone power bank as a 5v power supply for pressure transducers, added 33ohms of resistance else the powerbank shuts off after 30s. Sadly 150ma was too much for the LED I built in to it!
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30 Apr 2021 14:45 #48518 by Matt T
Replied by Matt T on topic Show us your homemade Test Equipment

Just made a cable today for using a phone power bank as a 5v power supply for pressure transducers, added 33ohms of resistance else the powerbank shuts off after 30s. Sadly 150ma was too much for the LED I built in to it!


Good thinking about the resistor. I've had problems with both a power bank and a 18V>12V/5V power tool battery adapter shutting down at low load with my USB>Banana cable. The tool battery adapter was also shutting off the 12V with my 10-30V "transducers". Hacked it to to run 18V straight from the battery to the 12V port.

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30 Apr 2021 15:13 - 30 Apr 2021 15:14 #48519 by Wightscope
Replied by Wightscope on topic Show us your homemade Test Equipment
For 12v stuff I bought one of those 20AHr Lithium jump starters with a 10A, 12v output on a 5mm plug.
Mainly use it via a 12/24v buck to run a Quiko soldering iron set up - that works really well -and I have a Jump starter handy as a bonus.



Most of my transducers are 5v but I just got a 10Bar absolute (ie complete vacuum to +9bar) sensor that is 12v, - going to need a load cable for that too.
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30 Apr 2021 17:21 #48525 by AJeep18
Replied by AJeep18 on topic Show us your homemade Test Equipment
Beat you to it Tyler :)

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01 May 2021 11:18 #48536 by Tyler
Replied by Tyler on topic Show us your homemade Test Equipment

Beat you to it Tyler :)


Lookin' good. B)

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04 May 2021 22:31 #48627 by Ben
Replied by Ben on topic Re:Show us your homemade Test Equipment
A few things I used on my scope recently and thought I would share the first using a chassis ear to visualize a bad wheel bearing (easily done with the included headphone) I'm going to try these on different places around the engine to find noises next time I get 1 ticking to see if it helps. the second is just a current shunt I was diagnosing a intermittent parasitic drain from rubbed through wire in the harness and needed to be able to see when and where I was pulling that it acted up, so like everybody else I grabbed my low current probe only to find it had been left on for the 10th time in a row and the battery was dead and I was out of 9v batteries (I assume just like everybody else) but I had a 30a current shunt laying around from a project years ago and it worked ! Not great certainly to low current probe like but good enough to find a intermittent draw while i wiggled the harness . Sorry I get any pics of it in use...

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