JYE Tech Forum

I assume you use a 10:1 probe?
Please read the topic about "Measurement errors with x10 probe on large negative signals",
why it happens and how it can be solved.

I assume you use a 10:1 probe?
It looks like the same problem as described in the following topic:
"Measurement errors with x10 probe on large negative signals".

Hallo Mat,

Ik zal de voorgestelde testen doen, al heb ik zelf al diverse testen gedaan en kon ik geen afwijkingen constateren.
Maar ik ben op dit moment alleen ~7500 Km van huis....

Wordt volgende maand vervolgt,
Groeten,
Arnold

I had exactly the same (running FW110 and HW ver E ) but assembled it and works fine

May I give you a tip? I use this '9V' 300mAh NiMH battery (8,4V) from Conrad without any problem: https://www.conrad.nl/nl/oplaadbare-9v-batterij-blok-ansmann-maxe-6lr61-nimh-84-v-300-mah-1-stuks-1305467.html It remains most of the discharge time above 8V, and it runs at least 2 hours before chargin...

Hello Sidey, And the resistance from ground (batt-) to pin 2&5? Must be 0 ohm. It looks like the ground pin of the Rotary PCB does not make very well contact, becouse you say it works when you press on it. The track of both PCB's has a large copper area, so you have to solder it long enough to m...

It looks like you have the same problem as I described in post "DC offset at AC coupling with >3,5V signal".
I wrote a solution in the post about "Measurement errors with x10 probe on large negative signals",
because it is coused by the same input circuit problem.

Just "Hold down [SEC/DIV] button for about 3 seconds. This will put the triggerpoint at the center"

Problem fixed! See description on the last post concerning "measuring large negative signals with an 1:10 probe". in short: I used an OMRON G3VM61B1 solid state relais instead of an LDR. It has a FET and is only 2 ohm when ON, the LED needs only 3mA and the switch is bidirectional! I put t...

Hello, I just tried an other (easier) way to fix the problem, and used an OMRON G3VM61B1 solid state relais instead of an LDR. It has a FET and is only 2 ohm when ON, the LED needs only 3mA and the switch is bidirectional! I put the output side (FET) in series with the input of the opamp pin 12, jus...