found an oscilloscope - damaged (?) - Page 1
Forum section: electronics / beginners

author: electromateria
author_rank: Regular Contributor
timestamp: September 03, 2022, 06:01:09 pm
content: was outside overnight in high humidity / mist and I assume it was already probably damaged, what should i do with it?it turns on but doesn't have the line running across it. I don't know much about oscilloscopes but it seems once they're turned on the reading line runes across the center. in this case there's no line just a blank screen. the line does show up for a split second when i turn it off and on.bk precision, model: 1472cshould i try to fix it? sell it? take all the parts out and repurpose them?

author: strawberry
author_rank: Super Contributor
timestamp: September 03, 2022, 06:05:40 pm
content: try firmware update or reset to factory settingssometimes some bits escape over time

author: inse
author_rank: Super Contributor
timestamp: September 03, 2022, 08:44:40 pm
content: This model is an analog dual channel 15MHz scope, no firmware included.

author: bdunham7
author_rank: Super Contributor
timestamp: September 03, 2022, 08:50:14 pm
content: Post a good photo of the front of it, plugged in and turned on. We'll tell you how to set the controls and you can see if it works or not.

author: Brumby
author_rank: Unknown
timestamp: September 04, 2022, 03:07:29 am
content: I have had a scope where no trace was visible. Turned out that every single adjustment that could affect the trace was about as far out of place as it was possible.My process for finding the trace was as follows:- Set yourself up in a darkened room.- No connections to any inputs.- Turn on the scope. Give it a minute to warm up.- Set the timebase to X-Y mode - which is CHB in this case- Turn the brightness to full (don't worry about focus). If you seesomecolour on the screen - even if it is just a faint glow across the whole screen - then there is hope!Even if you can't, keep going....- Adjust Y position from one extreme to the other. If you have a point where the glow is a bit brighter than anywhere else, leave it there.- Adjust X position the same as above.Edit:- If necessary, repeat these last 2 steps - possibly multiple timesWith any luck, you could have a bright spot giving you a headache! Time to turn the brightness down and adjust the focus.

author: electromateria
author_rank: Regular Contributor
timestamp: September 04, 2022, 04:51:32 pm
content: Quote from: bdunham7 on September 03, 2022, 08:50:14 pmI attached oneQuote from: Brumby on September 04, 2022, 03:07:29 amThanks for the detailed instructions, I followed them buy unfortunately no luck.Can't get the line to appear at all anymore. The power light is on, and the backlight works but other than that I think it might be fried.I tried what you mentioned, then tried all kinds of random settings for 10 minutes but no luck.

author: bdunham7
author_rank: Super Contributor
timestamp: September 04, 2022, 04:59:32 pm
content: Set the input couplings to GND and then find the knob that says 'Trigger Level--pull for auto' and pull it outwards. Make sure the intensity is fully clockwise and see what you have.

author: rstofer
author_rank: Super Contributor
timestamp: September 04, 2022, 06:22:31 pm
content: It seems to me that the trigger source is "EXT" - external and you don't have a trigger source connected. Put the selector on CH A or CH BPut the Mode switch on CH A.

author: strawberry
author_rank: Super Contributor
timestamp: September 04, 2022, 09:20:35 pm
content: remove front panel and clean it

author: electromateria
author_rank: Regular Contributor
timestamp: September 05, 2022, 12:48:49 am
content: Quote from: bdunham7 on September 04, 2022, 04:59:32 pmThis worked!WEVE GOT A LINE FELLASstarted playing around with it a bit. was turning a random knob and watching the line break into laser pulses made me feel like a scientist in a soviet bunkerI suppose the next step is getting some probes.Any tests I can do right away to check if it's working or broken?

author: bdunham7
author_rank: Super Contributor
timestamp: September 05, 2022, 12:56:10 am
content: Get yourself a wire and run it from the center of the CAL output in the upper right hand corner into the center pin of the A or B inputs (just use a single strand from a phone or ethernet line or something similar) and then twiddle the knobs some more.