Oscilloscope/probe question - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 22nd March 2010, 05:02 AM   #1
diyAudio Member
Join Date: Mar 2010
Default Oscilloscope/probe question


Sorry if my questions a bit nave.

I just bought a Beckman Industries Circuitmate 9020 oscilloscope for testing the DCO's on a broken snythesizer.

I think I'm looking for a 10x passive probe with high bandwidth and a BNC connection, but is there anything else I need to take into consideration?
  Reply With Quote
Old 22nd March 2010, 10:44 AM   #2
SY is offline SY  United States
diyAudio Moderator
SY's Avatar
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 2
Yes, you want to consider the probe's rated bandwidth and the expected load (especially the scope's input capacitance). Not all 10x probes are compatible with all oscilloscopes.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 22nd March 2010, 01:04 PM   #3
Join Date: Jan 2008
Blog Entries: 2
You don't say what frequencies are involved, are we talking RF or audio synth?

A 10x probe makes the picture height 10 times smaller. Is that what you really want? I don't think the DCO outputs are likely to exceed the scope's own voltage rating.

Looking at the scope it's only 20MHz. In many instances a piece of 50 ohm coax terminated with a BNC plug at one end and 2 crocodile clips at the other is perfectly adequate. Strip about 6 inches (15cm) of the outer co-ax sheath. Make a hole in the outer braid, bend the cable double at that point, and pull the inner out through the outer to leave a pigtail to which one of the croc clips can be attached. Connect the other croc clip to the inner and fit the BNC to the other end according to the instructions. Professional labs unually have a couple of dozen of these lying around.

  Reply With Quote
Old 23rd March 2010, 10:21 PM   #4
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
A good 10X probe will give you the bandwidth your scope is capable of. A piece of coax, while very useful for many things, will limit the scopes bandwidth due to capacitance and incorrect termination. For audio work, just about anything will work, and clips on the end of a piece of coax are handy. For digital, RF or anyplace you need high bandwidth and properly square square waves, you need a 10X (not 1X) commercial probe. (or you need a 50 ohm termination, but only if you're working on a 50 ohm system, lest you load the c*** out of higher impedance systems)

I may be barking up the wrong tree, but at least I'm barking!
  Reply With Quote
Old 23rd March 2010, 10:32 PM   #5
diyAudio Member
Steerpike's Avatar
Join Date: Jan 2006
Location: Johannesburg, South Africa
I have some nice Hamegs that are switchable 1x or 10x, which is quite useful.
Steerpike's Toybox
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Oscilloscope/probe question ouverview Equipment & Tools 1 22nd March 2010 08:04 AM
10x probe question NEO Dan Parts 5 22nd October 2008 04:40 AM
DIY Soundcard Oscilloscope probe? laserbeak Parts 5 6th July 2008 10:02 AM
Oscilloscope question bluesboyjr Everything Else 4 7th December 2004 04:10 AM
DIY oscilloscope probe Bricolo Parts 2 25th September 2003 11:56 AM

New To Site? Need Help?

All times are GMT. The time now is 05:11 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2