| ??? 02/10/05 09:19 Read: times |
#87068 - Job Done? Responding to: ???'s previous message |
Ria Dcosta said:
my project requires to display waveforms on 6 channels ... how this would be possible. Jez Smith said:
You can buy scope multiplexors which allow you to have upto 8 channels on a standard scope.They work by adding a D.C ofset to each channel. So there you go - question answered: yes, it is possible! One more thing. There are then 2 approaches to display the multiple waveforms: 1. Alternate: each sweep of the scope displays one waveform; ie, 1st sweep - waveform 1; 2nd sweep - waveform 2; 3rd sweep - waveform 3; 4th sweep - waveform 4; 5th sweep - waveform 5; 6th sweep - waveform 6; 7th sweep - waveform 1 again; etc. 2. Chop: during each sweep, the multiplexer switches rapidly between the traces. Both, of course, rely upon human "persistence of vision" to make it look like the 6 traces are displayed continuously & simultaneously. Persistence of the scope phosphor can also help. This is how dual-trace (as opposed to dual-beam) scopes actually work; in fact, as you're using old-technology like the 8255, you may well have some old scopes with a button marked ALT/CHOP to switch between the two methods! If you have, try it! |
| Topic | Author | Date |
| 6 waveforms to be displayed together | 01/01/70 00:00 | |
| multiplexor | 01/01/70 00:00 | |
| Job Done? | 01/01/70 00:00 | |
| ALT/CHOP | 01/01/70 00:00 | |
| ALT/CHOP | 01/01/70 00:00 | |
Actually, both! | 01/01/70 00:00 | |
| 8255? | 01/01/70 00:00 |