On 5/2/21 6:18 AM, Mike Coon wrote:
In article , says...
After selling off a prior oscilloscope nearly two decades ago, I decided
to pick up another used one. I have forgotten most of the functions.
This is a used two channel 30 Mhz Elenco S-1325. I can return if it
fails my testing.
All I did so far use a coax t adapter between an RF signal generator and
a 50 ohm dummy load to channel the remaining side into one of the scope
channels. I then set it for 28 Mhz and 100,000 uV output. After some
fiddling, mainly because I forgot most functions, I finally got a nice
sine wave of the approximate frequency. What other functions might I
perform to make sure it is functioning ok?
Thanks.
Does it offer combinations of two channels, e.g. A+B; A-B. Latter
differential could be checked with identical inputs and seeing how
accurately you get zero!
Thanks to you both. Well, all is not paradise and beginning to think
that I may return it. I could be overlooking something so looking for
some suggestions.
It seems that both frequency and voltage readings are off. I have an
old URM-25 RF signal generator that I have been feeding into it by
sampling off of the side of a t connector with one side having 50 ohm
dummy load and the other into ch 1 of the scope. Anything I've tried in
frequency and it seems like I'm reading at least double that frequency
on the scope if I count divisions from P-P. A 28 Mhz signal appears as
50 Mhz or plus on the scope. I just wonder if I'm overlooking something
here. Also, with the maximum output from the generator, 100,000 uV, I
am getting around 300,000 uV or more if I could divisions.
I don't yet have my 1/10x probes. They are due to arrive this week. I
will then immediately check the 2V P-P calibration signal on the scope
and see what happens.