Re: General opinion on 180 series scopes?
|
Always too many projects!?
On Mon, May 31, 2021 at 9:29 PM Dave Seiter < d.seiter@...> wrote:
I haven't looked at the 175A in about 15 years (besides as its' function as large paper weight).? Is there a better scan of the manual then the one on BAMA?? As I recall, it was very hard to read at the time.? The main reason I shelved both it and the 18x was the two pallets of mostly Tek gear I got shortly thereafter.? ?The 7104s and 7844s in particular where much more fun to deal with, especially since they are considerably lighter!? I only got two plugins with the 175A, and I'd remember if it had four channels.? I'll eventually get back to them, but I need to make room first and dispose of many other things.
-Dave
On Monday, May 31, 2021, 08:58:30 PM PDT, Jeremy Nichols < jn6wfo@...> wrote:
Dave, let me know if I can help with the 175A power supply; the low-voltage supplies are all solid state (except for one VR tube) and fairly simple. I have a working 175A and a parts unit. I¡¯m looking for a 1754A 4-channel vertical plugin for this ¡®scope.?
Jeremy?
On Mon, May 31, 2021 at 7:05 PM Dave Seiter < d.seiter@...> wrote:
I picked up one of the 180 series and a small pile of plugins many years ago, and while I was very excited at the time, I soon lost interest because everything was flaky, and was poorly engineered (in my opinion). I guess I was expecting 7603 quality, but I've never seen a working Tek scope with that many issues.? The only other HP scope I have is a 175A, which needs power supply work, I've kept it because it's anchoring (literally) the bottom of a relay rack stacked with much lighter gear.? Maybe someday....
-Dave
On Monday, May 31, 2021, 08:04:26 AM PDT, Jeremy Nichols < jn6wfo@...> wrote:
HP-180-series ¡®scopes have passed through my hands but I¡¯ve never collected one. They were HP¡¯s first all-solid-state high-end oscilloscope. Components are densely packed into the chassis and tend to run warm; cooling is important for lifetime. Make sure the fan is running well, filter is clean, all dust blown out.?
Jeremy? Currently eBay is showing 1804a 4 channel plugins for around $20-50. The 1804 does 4 channels but no math. The 2 channel units have addition and the specs say when one Chanel is inverted it acts like a differential input instrument! The 1821 dual time base is spectacular. It can be set up to have a variable width time delayed window within the display which is higher intensity on the screen and thus can magnify a signal within the signal. Also, a trigger can be set within that segment and a separate external trigger can be use for the main and the delayed segment. This gets you behavior like on a digital storage scope. Imaging the ability to trigger on certain glitches during the delay time. I used to use it to pluck out separate scan lines in an NTSC composite signal. Set up a separate circuit to count pulses in the signal and feed the counter output into the secondary trigger and you could pick the scan line. This is very flexible triggering.? Fun to use scope. I just picked up a 4 channel plug in and now have a 4 channel analog scope.? Screen display is rock solid when you get the trigger set up. The scope is intuitive to use. Schematics available. I think it is a great beginner scope if working. It is easy to repair with all discreet components. It has a cool feature of a signal delay line so you can see a bit of the signal before the trigger fires.
-- Jeremy Nichols
6.
|
Jeremy Nichols