- oscilloscope image partial collapse - 5 Updates
- Lightning Strike - 1 Update
| Michael Terrell <terrell.michael.a@gmail.com>: Nov 03 10:40AM -0700 > have an old Heathkit IO-10 auto ignition oscilloscope. from the center to the right side, the image is collapsed to the center.. a trace will only go from the left to the center, then its gone. you can see the right side image is collapsed in a vertical line, as its more intense . the trace from left to center is fine. it has vacuum tubes. all the tubes have heater glow. there are 2 pair of the same tubes, i swapped the positions to see if the problem moved. It didn't. I have a schematic pdf, not sure how to attach it. id like to get it going, but if its the crt, its pointless. where to from here? thanks Why do you call this an Auto Ignition Oscilloscope? It is just a typical hobby grade scope from 1960. A manual is on the BAMA site. This is not a binaries newsgroup, so it doesn't accept attachments. Check the plate voltage on both halves of the Horizontal driver tube. It looks like pin 10 of the CRT is the right side deflection plate. |
| Michael Terrell <terrell.michael.a@gmail.com>: Nov 03 11:19AM -0700 > have an old heathkit io-10 auto ignition oscilloscope. from the center to the right side, the image is collapsed to the center.. a trace will only go from the left to the center, then its gone. you can see the right side image is collapsed in a vertical line, as its more intense . the trace from left to center is fine. it has vacuum tubes. all the tubes have heater glow. there are 2 pair of the same tubes, i swapped the positions to see if the problem moved. it didnt. i have a schematic pdf, not sure how to attach it. id like to get it going, but if its the crt, its pointless. where to from here? thanks The Heathkit IO-20 was an Ignition Analyzer. It used a 12AX7 for the Horizontal drive. The plate resistors are 470K They are fed from a 350 VDC source and the CRT is a common 5UP1. It came with the clip on probe for the spark plug wire. |
| Phil Allison <pallison49@gmail.com>: Nov 03 02:12PM -0700 terrell....@gmail.com wrote: ====================== > > have an old Heathkit IO-10 auto ignition oscilloscope. ** You sure about that model number ? > Why do you call this an Auto Ignition Oscilloscope? ** He does't know what it is. > It is just a typical hobby grade scope from 1960. ** Think it is a lot better than " hobby grade". Being fully calibrated, DC coupled with mag shielded CRT and regulated HT rails put in the " service / lab" category. Sure, 200kHz vertical BW is not great but still very usable for most service jobs and for students doing science / engineering classes. https://www.radiomuseum.org/r/heath_oscilloscope_io_10.html ...... Phil |
| Michael Terrell <terrell.michael.a@gmail.com>: Nov 04 05:05AM -0700 > Being fully calibrated, DC coupled with mag shielded CRT and regulated HT rails put in the " service / lab" category. > Sure, 200kHz vertical BW is not great but still very usable for most service jobs and for students doing science / engineering classes. > https://www.radiomuseum.org/r/heath_oscilloscope_io_10.html I considered anything under 5 MHz to be hobby grade, since I worked in video. My current scope is a Tektronix 2465A I have two of the 2465 as well. I also have two of the Tektronix P6201 900MHz FET Probe 010-6201-00 to xamine crystal oscillators and tuned circuits, with minimal loading. |
| Mike Hooker <mhooker32@gmail.com>: Nov 04 06:46AM -0700 > Try checking all the resistors in the horizontal circuits - after the scope has been off for 15 mins. > One might have gone high or open. > ..... Phil the 470k resistors are good, and i have the 350v at the rail. still stumped. |
| bud-- <null@void.com>: Nov 03 10:00PM -0600 On 10/29/2021 10:59 PM, Mike S wrote: > shared neutral conductor than in any of the phase conductors. In the > absolute worst case, the current in the shared neutral conductor can be > triple that in each phase conductor." Triplens add on 3-phase. |
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