Electronics > Beginners
Lower bandwidth probes for a higher bandwidth oscilloscope - bad?
james_s:
I forgot to mention, most Tek scopes need probes that have a "readout pin" on the BNC, otherwise the V/div will be off by a factor of 10 when using 10x probes. Some modestly priced probes do have this but many of the cheapest ones like the P6100's don't.
tautech:
--- Quote from: james_s on December 31, 2019, 03:26:46 am ---I forgot to mention, most Tek scopes need probes that have a "readout pin" on the BNC, otherwise the V/div will be off by a factor of 10 when using 10x probes. Some modestly priced probes do have this but many of the cheapest ones like the P6100's don't.
--- End quote ---
Typically prices for readout probes are just obscene when it's just a resistor between the pin and ground that sets the input attenuation.
So I just get these 300 MHz Pintek 100:1 probes from their factory and retail them for around the same price as here:
https://www.ebay.com/itm/1pc-Oscilloscope-Probe-Kit-CP-3308R-100-1-300Mhz-1500V-100M-Readout-Pin-PINTEK/132996940150?hash=item1ef73c4176:g:H3EAAOSwFGxc-xgG
Otherwise these 300 MHz 10:1 Siglent auto sense probes are not too badly priced and quite a nice compact probe:
https://siglentna.com/product/sp2030a-auto-sense-300-mhz-oscilloscope-probes/
JustMeHere:
--- Quote from: fazeka on December 30, 2019, 09:25:23 pm ---
--- Quote from: tautech on December 30, 2019, 09:21:13 pm ---Siglent PP510 100 MHz probes
--- End quote ---
Guys, didn't realize there were some decent cheap scope probes nowadays... even what tautech suggested with the P6100... Yes my friend owes me but maybe I can play that card later for something else... ;D
What other "value" probes do you guys like?
--- End quote ---
Rigol puts 150 MHz probes in the 1054z box now.
fazeka:
--- Quote from: james_s on December 31, 2019, 03:26:46 am ---I forgot to mention, most Tek scopes need probes that have a "readout pin" on the BNC, otherwise the V/div will be off by a factor of 10 when using 10x probes. Some modestly priced probes do have this but many of the cheapest ones like the P6100's don't.
--- End quote ---
Doesn't seem the Pomona 6493 has these... :(
tooki:
--- Quote from: fazeka on December 30, 2019, 08:22:54 pm ---Hi all,
I have an older Tektronix 2445A 'scope that needs a new pair of probes. The only work I do is in the audio realm. Highest frequency I would test would be the bias frequency of an analog tape recorder (432 kHz).
My friend has a set of Pomona 6493 probes he would consider selling me. I did some research and found that these are 60MHz. The Tek 2445A is a 150MHz scope.
I've researched online, seems everyone suggests going with probes that are higher bandwidth.
What's issues would I encounter (for audio work, if it matters) with using 60MHz probes with a 150MHz scope?
Thanks!
--- End quote ---
For sure, those probes will do fine for your application.
What's odd to me is that the Pomona datasheet for that probe (attached below) lists the probe bandwidth as being 150MHz (-3dB), but a "scope bandwidth" of 60MHz. Can someone more knowledgeable explain what they mean here??
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