[Heath] IO-4235 scope operation question.

[Wilson]

Do you know the scope is functional?
If the spot disappears, you may have the input coupling set to DC, when it should be AC, since you don’t know if there’s a DC offset present.
If you are on AC coupling and the spot disappears, then you may have more signal than your sensitivity allows.  That is, the signal may be offscale top and bottom.

When the input and scaling are right, you should see a vertical line showing the amplitude of the signal.
Once you have that, you set triggering to auto, AC, and adjust the trigger level pot to get a sweep.
You can use the scope to see  DC offset, but the sensitivity must be reduced enough to keep the trace onscreen.
If the offset is large, then the AC  component may look very small, meaning you are making two measurements.

Beware of connecting the scope to high DC voltages, especially if you are not using an attenuating probe.  You can blow an input amp!

Let us know what happens,
WL

From: Alexander N. Gerli 
Sent: Sunday, September 21, 2014 12:59 PM
To: heath at puck.nether.net ; heathkit at mailman.qth.net 
Subject: [Heath] IO-4235 scope operation question.

Hi, folks,


I'm having trouble getting a trace on my scope. That is to say, I'm just trying to read some p-p voltages while working on an old transceiver. I can get a spot and center it, but I can't get the horizontal sweep to start. Naturally, all I have is the Assembly Manual for it. Can someone give me some generic help on what settings I've got to use to read this? I've set it up for 10V p-p, but then I attach the probe to the circuit point, the spot goes off-screen like it's clamping. Tried different voltage settings, no luck. The darn sweep won't start. and I've probably got an incorrrect setting somewhere.


​Thanks for the help! 73, Sandy AC1Y​




Alexander N. Gerli, Sr.

548 Allred Mill Road

Mount Airy, NC 27030-2202


Scotsmen walk about 900 miles each year.

A Scotsman drinks around 45 gallons of Whisky a year.

Scotsmen get about 20 Miles Per Gallon.



--------------------------------------------------------------------------------
_______________________________________________
Heath mailing list
Heath at puck.nether.net
https://puck.nether.net/mailman/listinfo/heath
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/heath/attachments/20140922/79a7d920/attachment.html>