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Ludwig,

I selected the 12 volt option when building both the Rev 1 low band QMX
and the one we are currently debugging ( high band QMX Rev3 ).

I have not responded with oscope results because of a family emergency here.
I hope to get back to the work bench and the QMX soon.

73,
Charles

Ludwig,

I have not succeeded in getting signal traces with the oscilloscope.? Any guidance on
methods for making the probe connections to QMX to allow hands free for using PuTTY
( T press ) and adjustment of scope ( pressing Auto function ) would help me do the?
measurements.

Charles
K5KXJ

On Fri, Jun 14, 2024 at 10:19 PM, C R Murrell wrote:

Any guidance

Charles, it depends on the type of your oscilloscope.

73 Ludwig

I use AWG30 solid wire wrap wire to bring out test points.? I bring the wire out in a looping arc and anchor it to a convenient spot on the board with a drop of cyanoacrylate wire tacking adhesive.
Then you can gently clip onto the free end for test and measurement.? This kind has 8 colors to help keep track: I also tack some heavier bare wire to a ground area, to take ground leads.
73, Don N2VGU

On Sat, Jun 15, 2024 at 01:52 AM, Donald S Brant Jr wrote:

I bring the wire out in a looping arc and anchor it to a convenient spot on the board with a drop of cyanoacrylate wire tacking adhesive.

Yes. it's a way to produce testpoints to connect probe tips without holding in your hand, maybe in some cases the best way.
I'm not a fan of putting adhesive on my boards. In some cases I try to keep test connections as short as possible. So I like to use features of today's oscilloscopes to substitute a third hand. The exact procedure depends a bit on the model of oscilloscope.

73, Ludwig

Thanks for the info, Don.

Charles
K5KXJ

Ludwig,

I have a Rigol DS1202 ZE scope ( 2 ch ).? I will look for more?
capable probes to free up hands.

Thanks for your continuing help on my QMX problem.

Charles
K5KXJ

On Sat, Jun 15, 2024 at 05:30 AM, @Ludwig_DH8WN wrote:

I'm not a fan of putting adhesive on my boards.

A drop of hot glue (actually a kind of wax) will also work, and can be flicked off cleanly with a fingernail or by tugging the wire sharply.
On my next project which requires microelectronic work I am going to get one of these probe sets: ? ?
.
73, Don N2VGU

Thanks, Don.? That looks like a super tool for me to check out.

73,
Charles
K5KXJ