On Sat, Apr 5, 2025 at 8:21?AM Jay Czaja via groups.io <jmczaja=
gmail.com@groups.io> wrote:
This scope has me scratching my head. I had it running all night without
any problem, I doubt part number 160-2393-00 is actually the culprit
despite the occasional startup error. I suppose I should scrutinize the PSU
more.
Yeah, until you've eliminated PSU problems, there's no point in
troubleshooting anything else.
I have a question. What is the best way to measure ripple on the LV supply.
When I checked it the first time, I had the 2247A on an isolation
transformer with my 2245A connected directly to mains AC. I used a x1 probe
on my 2245A to check for ripple and clipped the ground lead of the probe to
the chassis of the 2247A.
I don't know that an isolation transformer helps, but maybe you want the
two scopes plugged into the same outlet. It can't hurt to connect the
ground clip close to the power rail. Tek always specifies PSU ripple at
20MHz bandwidth, so you want the 20MHz bandwidth limiter on. I don't think
most 1X probes have 20MHz bandwidth, so you might want to just use flying
leads or a coax with clip leads to hook up.
Note that you can measure your noise pickup by turning the instrument under
test off with your leads hooked up.
