Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page
Unknowns signals on 6052E
Andrea
Member
06-11-2003 10:36 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Hi, have you wired an INPUT channel of a 6052E to an oscilloscope?
There are some bad signals: one is a 100 KHz frequency and 100 mV
amplitude, it's present when you set the "FS" on-board cursor. If you
set this cursor on "GS" another terrible signal appear, with larger
amplitude then the first one. Is there someone who knows the origin of
these signals?
Thank for avery explications...
Andrea
There are some bad signals: one is a 100 KHz frequency and 100 mV
amplitude, it's present when you set the "FS" on-board cursor. If you
set this cursor on "GS" another terrible signal appear, with larger
amplitude then the first one. Is there someone who knows the origin of
these signals?
Thank for avery explications...
Andrea
markwysong
Active Participant
06-11-2003 02:06 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Can you explain what the FS onboard cursor is? I don't know what you mean by that, or how you "set" it. I use these boards, so I'm interested as to what signals you are referring to, and I want to see if I can duplicate them.
Mark
Mark
06-13-2003 04:06 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
markwysong wrote in message news:<506500000005000000B6FC0000-1042324653000@exchange.ni.com>...
> Can you explain what the FS onboard cursor is?
I'm sorry: my acquisition system consists of a 6052E card and an
BNC2120. The switch locates on the BNC2120, just near the BCN
connector. There's one every connector...
You can try to switch between the two options and you will see these
stranges (for me) signal. The oscilloscope input impedance must be at
least 1 MOhm.
Ciao
Andrea
> Can you explain what the FS onboard cursor is?
I'm sorry: my acquisition system consists of a 6052E card and an
BNC2120. The switch locates on the BNC2120, just near the BCN
connector. There's one every connector...
You can try to switch between the two options and you will see these
stranges (for me) signal. The oscilloscope input impedance must be at
least 1 MOhm.
Ciao
Andrea
markwysong
Active Participant
06-13-2003 02:40 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
I'm actually not that surprised that you'd see signals of this sort. First, there's no real "source". Your scope's impedance is at least 1 MOhm, while the input impedance of your 6052E channel is 100 MOhm. Therefore, since there's very little resistance on the line, it's very susceptible to electrical noise.
Something you might try is looking at the diagrams on the BNC-2120 user's manual. For the FS mode (Floating Source), they suggest a 4.99K resistor from the negative side to the AI gnd. That way, you dissipate all that noise through the AI gnd. If the noise isn't attenuated a lot, it means that it can supply a sufficient amount of current, and will corrupt your real signal.
Mark
Something you might try is looking at the diagrams on the BNC-2120 user's manual. For the FS mode (Floating Source), they suggest a 4.99K resistor from the negative side to the AI gnd. That way, you dissipate all that noise through the AI gnd. If the noise isn't attenuated a lot, it means that it can supply a sufficient amount of current, and will corrupt your real signal.
Mark
