Joranalogue TEST 3 - Eurorack V/mA Meter

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Joranalogue TEST 3 - Eurorack V/mA Meter

Post by joranalogue » Tue Jun 20, 2017 12:27 pm

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Test 3 is a purpose-designed tool for measuring voltages and currents in your Eurorack system. This means that just a single circuit board or module can now replace a convoluted test setup with multiple multimeters, custom cables etc.

Two push buttons allow you to cycle the value shown on the LED display between three measurements (voltage, current and stored peak current) of the three power rails. The peak currents continually update in the background on all rails, making it ideal for quickly getting maximum current figures.

Apart from measuring the current draw of a single module, Test 3 also supports testing power supplies and cables, measuring an entire system (up to 1 A of current on each rail), troubleshooting DIY modules, powering a skiff from a larger system...

Note: Test 3 is available as a (very easy) do-it-yourself project, requiring some soldering and basic tools. It can be built either as a standalone circuit board with the DIY Kit, or as a Eurorack module with both the DIY Kit and Front Panel Kit. This is a great beginner project if you're just getting into synth DIY!

Available now!

More info: https://joranalogue.com/test-3
ModularGrid: https://www.modulargrid.net/e/joranalog ... ign-test-3

Pricing
• Without front panel: €70 / $70 (MSRP)
• With front panel: €95 / $95 (MSRP)
8 HP, 28 mm deep when built as module







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Last edited by joranalogue on Thu Apr 29, 2021 6:47 am, edited 18 times in total.
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c0nsumer
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Post by c0nsumer » Tue Jun 20, 2017 12:39 pm

This looks really neat. Does it offer protection for the main PSU in the event that the attached module somehow fails?

That is, would this be appropriate for testing unknown-state newly-built DIY modules or used-purchases or whatnot?

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Post by joranalogue » Tue Jun 20, 2017 12:57 pm

c0nsumer wrote:This looks really neat. Does it offer protection for the main PSU in the event that the attached module somehow fails?

That is, would this be appropriate for testing unknown-state newly-built DIY modules or used-purchases or whatnot?
There's no real overcurrent protection, because something like a polyfuse would cause too much voltage drop, especially at 1 A. A more advanced way would be to switch off the rails electronically, but that method has a bunch of issues as well (more components on an already crowded layout, and voltage drop again to a lesser extent).

At any rate, your PSU should have reliable overcurrent protection. T3 does handle pretty large overloads, and has reverse-polarity protection on all rails + noise filtering. So it's protected to an extent. Hope that answers your question!
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Post by acgenerator » Thu Jul 06, 2017 8:23 pm

I'll be getting one of these for sure.

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Post by joranalogue » Fri Aug 04, 2017 4:53 am

Hi all,

Test 3 was going to be available this month, but I hit some delays. The design is ready to go, I just have to wait for some suppliers.

I hate delays as much as the next person, but that's Eurorack I guess. :deadbanana:

They should pop up at dealers in September! MSRP will be €70 / £65 / $80 without front panel, €95 / £85 / $110 with.
Last edited by joranalogue on Fri Oct 06, 2017 2:31 pm, edited 1 time in total.
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Post by joranalogue » Fri Sep 15, 2017 8:21 am

Available now!

The wait is over! EU folks can get Test 3 directly from the webstore now, and they're coming to dealers worldwide soon (to be announced).

:banana:
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Post by joranalogue » Mon Oct 02, 2017 5:32 am

Now also in stock at Thonk (UK) and Modular Addict (US). :yay:
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Post by joranalogue » Wed Nov 15, 2017 6:36 am

Watch Quincas Moreira aka the Synth DIY Guy build Test 3! Includes a very nice step-by-step overview of the build and measurement demo.

[video][/video]

Now also available at Perfect Circuit Audio (US).
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Post by joranalogue » Thu Jan 25, 2018 8:54 am

Delighted to announce that Test 3 is now also available at SynthCube! http://synthcube.com/cart/joranalogue-test3-euro-kit
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Post by monads » Thu Jan 25, 2018 9:35 am

Such a handy little module! And easy to build (Thonk) too! Thanks!

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Post by joranalogue » Fri Jan 26, 2018 7:01 am

monads wrote:Such a handy little module! And easy to build (Thonk) too! Thanks!
Hey, that's great to hear! :tu:

By the way, if anyone's wondering if this is a good DIY kit to start out with... It absolutely is! Here's a review by Little Modular - this was his first ever kit:

[video][/video]
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Post by joranalogue » Tue Feb 13, 2018 11:07 am

The new production batch has arrived! Now back in stock at the Joranalogue webstore and soon also at Exploding Shed.

With this new batch now available, the circuit schematics and firmware have been open-sourced. This means you can develop and publish alternative firmware for T3, or use it as a basis for your own designs. Find the source files on GitHub.
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Post by spacenoodle » Fri Mar 30, 2018 7:55 pm

When using this to monitor power going to DIY modules on a breadboard, would the circuitry in Transient Modules Breadboard Power be redundant (as this module has the protection and filtering built in)? Maybe just run the power straight from the output of Test 3 to the rails/terminal strips on the breadboard?

https://www.thonk.co.uk/shop/transient-breadboard-kit/

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Post by joranalogue » Sat Mar 31, 2018 6:50 am

spacenoodle wrote:When using this to monitor power going to DIY modules on a breadboard, would the circuitry in Transient Modules Breadboard Power be redundant (as this module has the protection and filtering built in)? Maybe just run the power straight from the output of Test 3 to the rails/terminal strips on the breadboard?

https://www.thonk.co.uk/shop/transient-breadboard-kit/
Yes, Test 3 has built-in reverse polarity protection and filtering built-in, so you can power a breadboard directly.

Please note that neither Test 3 or the Breadboard Supply have overcurrent protection, so your PSU should be properly protected in that regard.
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Post by Xtheunknown » Fri Mar 08, 2019 7:04 pm

Can the Test 3 be used to verify whether a module connecting cable is plugged in correctly (e.g. is the polarity correct, is it aligned properly on all of the bus board pins, etc.) before connecting a module? I’m getting a Doepfer Monster case that doesn’t have notched connectors, and I’m looking for some form of power protection.

Any ideas would be greatly appreciated, maybe a female to male 16 pin adapter, etc.

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Post by joranalogue » Sat Mar 09, 2019 6:22 am

Xtheunknown wrote:Can the Test 3 be used to verify whether a module connecting cable is plugged in correctly (e.g. is the polarity correct, is it aligned properly on all of the bus board pins, etc.) before connecting a module? I’m getting a Doepfer Monster case that doesn’t have notched connectors, and I’m looking for some form of power protection.

Any ideas would be greatly appreciated, maybe a female to male 16 pin adapter, etc.
If I understand your application correctly, yes you could, simply by powering Test 3 via the cable you want to test (so you don't need to use the meter output header). As soon as the +12 V rail is available and wired properly, T3 will power up. You can then check the voltages of each of the power rails. Should something be wrong however, Test 3's power input is protected against reverse voltage and it will not be damaged.

I'd recommend combining T3 with a dedicated Eurorack cable checker (there's a few available from other manufacturers). These two tools together will then let you check all components within the power distribution system: the PSU, bus board and cables.
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Post by Xtheunknown » Sat Mar 09, 2019 1:24 pm

Joran- thanks so much for the quick reply! I haven’t done any soldering for quite some time, but this build looks pretty basic, so I’m going to give it a try. And thanks for the tip on the cable tester as well.

Keep the modules coming! You’re filling a real gap in Eurorack and your designs are awesome.

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Post by joranalogue » Sat Mar 09, 2019 3:37 pm

Xtheunknown wrote:Joran- thanks so much for the quick reply! I haven’t done any soldering for quite some time, but this build looks pretty basic, so I’m going to give it a try. And thanks for the tip on the cable tester as well.

Keep the modules coming! You’re filling a real gap in Eurorack and your designs are awesome.
Happy to help & thanks for the kind words! This should be a perfect project for getting back into soldering.
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Post by batch » Sun May 19, 2019 9:26 am

I really like the idea of this module, but the 1A limit on each rail is very limiting. Is there anyway to take this much higher (like 20A?).

My PSUs deliver 17A on each rail ...
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Post by khakifridge » Sun May 19, 2019 10:13 am

batch wrote:I really like the idea of this module, but the 1A limit on each rail is very limiting. Is there anyway to take this much higher (like 20A?).

My PSUs deliver 17A on each rail ...
You want to test a module that draws 20A?? :eek:

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Post by batch » Sun May 19, 2019 10:45 am

No, I want to know what the amp draw on my rails actually is.
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Post by joranalogue » Sun May 19, 2019 11:42 am

batch wrote:No, I want to know what the amp draw on my rails actually is.
This would require a significant redesign unfortunately. To start, you can't really push much more than 1 A through a ribbon cable.
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Post by cackland » Sun May 19, 2019 12:36 pm

batch wrote:No, I want to know what the amp draw on my rails actually is.
Shouldn't that be easy.. if you know what you psu amp draw is, minus the module amp draw and you have your answer.

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Post by khakifridge » Mon May 20, 2019 3:42 am

batch wrote:No, I want to know what the amp draw on my rails actually is.
OK. This isn't really the tool for what you want - this is for testing a single module. (I have one boxed up with one of Rick's little PSUs. It does the job well.)

There are other things out there for measuring current usage on a rail. Or you could do it by hand by measuring the voltage drop across a resistor placed between your PSU and your rail, and invoking Ohm's law.

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Post by sko87pro » Wed May 22, 2019 1:43 am

This cool thing is clearly about testing power... but I just wish it also had a 3.5mm jack so it could measure positive and negative volts of CV...

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