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Overunity Machines Forum



Test Equipment: Oscillocopes

Started by MarkE, February 14, 2015, 04:35:20 PM

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MarkE

#40
February 17, 2015, 08:26:46 PM
Quote from: Brian516 on February 17, 2015, 08:38:27 AM
It appears that the "Modify" button has disappeared, so I can't just edit my last post.
Sorry for my own stupidity in not checking the materials that I already have to see if I had the info that I needed before going and asking a bunch of unnecessary questions and taking up people's valuable time to read/reply to them.
When I'm to a point where I know what I am doing, I will pay it forward and teach the next guy since you all are taking your time to teach me.  That's only fair.  Then when I am incorrect about something or leave out important info, you will only then have to take the time to add a little info.

Brian

[edit] - ahh I see now, apparently after a certain amount of time has passed, you are unable to edit your posts anymore... [end-edit]

-  I am looing at probes to order, and from what I gather, the lower the model number, the higher the quality??

Here are my options for the standard 1x/10x probes:
---T5100 - http://www.ebay.com/itm/HQRP-100MHz-Oscilloscope-Probes-fits-Tektronix-HP-T5100-X1-X10-New-/221690519344?pt=LH_DefaultDomain_0&hash=item339dc8df30

---P6100   - http://www.ebay.com/itm/Two-x1-x10-100MHZ-Oscilloscope-clip-probes-HP-Tektronix-/290374567712?pt=LH_DefaultDomain_0&hash=item439bac4720

---TP6100 - http://www.ebay.com/itm/Two-Oscilloscope-Scope-analyzer-Clip-Probe-x1-x10-100MHz-Kit-For-Tektronix-HP/291177486377?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D29170%26meid%3D8ad8e434a92c4ee9afad4dbc3106985a%26pid%3D100005%26rk%3D6%26rkt%3D6%26sd%3D220375454020&rt=nc

All of them are 6Mhz/100Mhz except for the P6100's, which are 4Mhz/100Mhz.
All of them are X1 = 150VDC peak; X10 = 300VDC peak, except for the TP6100 which are 300VDC/600VDC.
My scope's Max Input Voltage is (dc coupled) 250V(DC + peak AC) or 500V p-p ac at 1khz or less;  (ac coupled) 500V (dc + peak ac) or 500V p-p ac at 1khz or less.
So, if I am correct here, If I want to be able to take advantage of the full ability of my scope with the 1X probe, I would want to choose the TP6100 probes?

Also, as for a HV probe -
http://www.ebay.com/itm/100MHz-High-Voltage-Oscilloscope-Clip-Probe-4000V-Alligator-Clip-Passive-P5100-/111586099163?pt=LH_DefaultDomain_0&hash=item19fb0cbfdb
http://www.ebay.com/itm/Tektronix-013-0290-02-Oscilloscope-Probe-Screw-On-Hook-Clip-Set-P5100-P5120-/321462078021?pt=LH_DefaultDomain_0&hash=item4ad8a20a45

Should I wait til I can afford that one and the spring loaded hook tip, or just get one along the lines of a $30 2kV probe with all the accessories?
I also noticed that none of those probes come with the spring point ground fitting. Is that just something more for HV applications?

Brian


heres a laugh..... a 1,000X  40kV probe....http://www.ebay.com/itm/1000X-P5104High-Voltage-40KV-40000V-20MHz-Oscilloscope-Passive-Probe-Clip-/291119549732?pt=LH_DefaultDomain_0&hash=item43c813cd24     :o
So the dirty secret about those sub $10.00 probes that Aidetek and others sell is that they use copper wire core coax.  This means that the first 20ns to 50ns of any fast rising waveform is going to show a bunch of ringing that is reflections travelling up and down the probe cable.  If you can live with that, then $7. a probe is cheap.  The probes that Aidetek sell do work.  The compensation box's adjust OK, and the measured bandwidth is a tad under the 100MHz they claim:  about 80MHz.  A colleague of mine and I bought a bunch of those probes, and hacked them up to make specialty probes.   

If you want clean measurements of stuff faster than 1MHz or with rise and fall times faster than 50ns on a budget, then the 4900 series probes from ProbeMaster in San Diego CA run about $50. each depending on the options.  If you buy from ProbeMaster get a couple of their high frequency ground adapters for $2.50 each.  Or you can cruise eBay and buy used Tek or Agilent probes.  Tek P2220's are decent 1x/10x switchable probes that really do meet their stated -3dB bandwidth of 200MHz, and have proper nichrome cable cores. 

Brian516

#41
February 17, 2015, 10:25:51 PM
Oh well, maybe I'll luck out with the ones I ordered.   Next ones I get I'll go with the gold ProbeMasters. 
Time to pull apart my scope and hit the switch contacts with deoxit D5....

MarkE

#42
February 17, 2015, 11:41:27 PM
Quote from: Brian516 on February 17, 2015, 10:25:51 PM
Oh well, maybe I'll luck out with the ones I ordered.   Next ones I get I'll go with the gold ProbeMasters. 
Time to pull apart my scope and hit the switch contacts with deoxit D5....
The probes from Aidetek are fine as long as you use them within their limitations.
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