Products > Test Equipment
scope differential probes
robint:
--- Quote from: jonpaul on October 13, 2023, 01:20:23 pm ---Read and learn: 1960s..1990s Circuit Concets books written by Tektronix i staff.
Calssisc and authoritative even today.
https://www.w140.com/tekwiki/index.php/Concepts_Series
Oscilloscope Probe Circuits:
https://w140.com/tekwiki/images/6/62/062-1146-00.pdf
Probe measurements
https://w140.com/tekwiki/images/1/19/062-1120-00.pdf
Enjoy,
Jon
--- End quote ---
WOW JP this should be made into a sticky - thats real gem stuff, basics dont change and that was in the days when there was pride in pursuit of excellence in making an honest product and providing genuine customer service. I served my time with an Industrial Instrument Automation Company whose proud boast was that they made equipment and guaranteed spares and service to last the life of the plant (20 years)
Imagine that document was produced in a typing pool (those legs) on mechanical Olivetti? typewriters using carbon paper.
tautech:
--- Quote from: robint on October 13, 2023, 11:01:31 am ---@tautech
(with the croc gnd leads connected removed)
I think the tiptster's purpose was that the croc leads didnt flop around - as they do and short to something bad
--- End quote ---
Sure, but they are made detachable so use it !
WRT to the cost differential probes......go price some current probes if this scares you.
It has always been this way however cheaper differential and current probes for the hobbyist are available now but weren't when I was setting up....we floated scopes < not ever doing that again and shelled out $200 for 2nd hand P6021 current probes.
Buying the scope is never the last cost.
alm:
--- Quote from: tautech on October 13, 2023, 07:16:03 pm ---Sure, but they are made detachable so use it !
--- End quote ---
Except that attaching them together will give you better performance. Tektronix made a special type of ground lead back when they were making passive probes specifically for use with the differential amplifiers used in the 7000 series scopes. They surely didn't design that because their customers couldn't figure out how to detach their ground lead.
tautech:
--- Quote from: alm on October 13, 2023, 08:17:36 pm ---
--- Quote from: tautech on October 13, 2023, 07:16:03 pm ---Sure, but they are made detachable so use it !
--- End quote ---
Except that attaching them together will give you better performance.
--- End quote ---
When/if you need it. ;)
A tech I delivered a DSO to never used probe reference leads and instead had a dedicated reference lead back to the scope which although not giving wonderful performance suited his needs and also allowed reference connection anywhere on the DUT and not be constrained by the length of the probe reference lead.
Of course with a proper differential probe their long leads also offer this advantage.
--- Quote ---They surely didn't design that because their customers couldn't figure out how to detach their ground lead.
--- End quote ---
You'd be surprised by the # that initially don't know reference leads can be detached.
alm:
--- Quote from: tautech on October 13, 2023, 08:31:09 pm ---You'd be surprised by the # that initially don't know reference leads can be detached.
--- End quote ---
Back then probes shipped without ground leads attached. So I think the number of people knowing that they could be detached was higher then ;)
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