[Test-Equipment] Scope questions: OT for Tek?

[bonddaleena at aol.com]

Hi. I collect scopes (don't ask me why, some kind of sickness) ha ha

I have a nice assortment, which includes a big 'ole LeCroy (350 MHz) to a small Leader (15 MHz). I have done a refurb on them all and I am quite happy with them all. This does not include 3 Tek 7623s which are driving me nuts, but that's for another time.

Here is my current 'problem'.....

I have both a Leader LBO-526 and a Kenwood CS-2150 with different problems.

I have NO doubt that both of these scopes are the same internally and externally, except for the logos. Unfortunately, I have not been able to find any type of manual for either.

I'll start with the 'simple' problem.... The Leader.

It works beautifully with a crisp display, but when I feed a signal to Channel one, the display is non-functional at .2 mv/div and higher, In other words, using the calibrator (or an external signal generator), I have a nice display until I start LOWERING the voltage/div. This is kinda opposite what seems likely. .1 V/div (and lower) looks OK and .2 V/div looks like ground. Channel Two is fine.

Next the .......... Kenwood

Using the calibrator signal as above, and the exact same settings, the scope looks like it is TRYING to work. I can see 'flashes' of light on the screen, but no traces. Pushing the "trace locator' produces a compressed, visible trace in the center of the screen, for each channel. I can use the 'position' knob to move these traces up and down. However, when I release this 'finder' button, the traces disappear and all I see are these low level flashes of light and I cannot locate the beams. It appears (!!) they are off screen.


Any Ideas?? The Leader problem is one that I can live with, since Channel 2 functions as expected at voltages of .2 V/div and up.

Thank you in advance!
If you wish, you can contact me off list:

n4ue at arrl.net

ron
N4UE