Probes for Fluke196b. - Page 1
Forum section: electronics / beginners

author: Lachin012
author_rank: Regular Contributor
timestamp: December 08, 2022, 10:31:42 pm
content: Hello! Please tell me if I buy these probes, will they fit my Fluke-196b oscilloscope? I was confused by the fact that it says that the probes are at 300 MHz, and my oscilloscope is at 100 MHz.https://www.ebay.com/itm/185411884333

author: TimFox
author_rank: Super Contributor
timestamp: December 08, 2022, 10:39:11 pm
content: For x10 or x100 probes into a 100 MHz oscilloscope, the important parameter is the input capacitance of the 1 megohm oscilloscope input.The specifications for the probe dictate the range of that capacitance for which the probe can be adjusted.This one is specified for 10 to 20 pF at the oscilloscope.Buried in the Fluke manual is the input capacitance, 15 pF.Should work.

author: Lachin012
author_rank: Regular Contributor
timestamp: December 08, 2022, 10:43:10 pm
content: Quote from: TimFox on December 08, 2022, 10:39:11 pmIt turns out these probes are not suitable for my oscilloscope?

author: TimFox
author_rank: Super Contributor
timestamp: December 08, 2022, 10:46:39 pm
content: See my edited response above.

author: Lachin012
author_rank: Regular Contributor
timestamp: December 08, 2022, 10:52:53 pm
content: Quote from: TimFox on December 08, 2022, 10:46:39 pmThanks, Could I then just buy two blue seats of the red one, as I understand it, the red one is 100:1 and the blue one is 10:1?

author: TimFox
author_rank: Super Contributor
timestamp: December 08, 2022, 10:55:46 pm
content: Reading the published data, everything should work.I worry about high-voltage probes from vendors I'm not familiar with.Note that the "5 kV" rating on the high-voltage probe is peak-to-peak, which implies only 2500 V DC.How much voltage will you probe with this?Also, do you know how to adjust the probe compensation (shown in their datasheet)?

author: Lachin012
author_rank: Regular Contributor
timestamp: December 08, 2022, 11:00:07 pm
content: Quote from: TimFox on December 08, 2022, 10:55:46 pmI know how to set up probe compensation, I read it in the manual, I will work no more than 600v, maximum 1000v.Usually I work 220v and 380v, and sometimes in rare cases it happens from 600v to 1000v.

author: bdunham7
author_rank: Super Contributor
timestamp: December 08, 2022, 11:13:23 pm
content: They should work fine. If you are doing any type of high voltage work you probably want the 100X (2301C) version. There are two issues with the 10X 2301B, the much lower voltage rating and the input capacitance. Even if you don't exceed its 600V rating, your scope may not be able to make use of it at those voltages. 5 divisions at 10V/div x 10 is 500V from the bottom of the screen to the top. The input capacitance of the 2301C is <6pF, which is good for higher voltage and frequency combinations. The 2301C is 10-12pF, which is less good.The documentation isn't great, but I think they intend the 2301C to be rated at 5kV DC + ACpknot ACp-p. So +/- 5000 volts max. That's a lot! I've used mine at 2000Vrms@ 20kHz, although I can't recommend that as an everyday thing. Just remember that the voltage rating goes down with frequency.

author: Lachin012
author_rank: Regular Contributor
timestamp: December 08, 2022, 11:21:58 pm
content: Quote from: bdunham7 on December 08, 2022, 11:13:23 pmThanks for the answer, if I work no more than 380v can I buy 2301B ? if I work higher than 380v, then it's better to take 2301C, do I understand correctly?I have one 100:1 probe and wanted to buy two more 10:1 probes for everyday use up to 220v.

author: TimFox
author_rank: Super Contributor
timestamp: December 08, 2022, 11:37:47 pm
content: A quick look at the "B" showed inconsistent voltage ratings, but the same oscilloscope capacitance range.Be careful using the 10x probe at higher voltages.As mentioned above, the capacitance at the other end (sharp tip) is also higher; that may not be important to your application, but if it is the 100x probe is better.Again, I am in no position to guarantee a probe I haven't used, and I worry a little about the somewhat careless specifications for the maximum voltage.

author: Lachin012
author_rank: Regular Contributor
timestamp: December 08, 2022, 11:59:08 pm
content: Quote from: TimFox on December 08, 2022, 11:37:47 pmIf, for example, you buy 100:1 probes, will they also fit and will show the same frequency as 10:1, or will the frequency change? I understand that in the oscilloscope you need to select 100: 1 and then work.As I understand it, everything above 380v is better to buy a 100:1 probe, everything below 380v can be 10:1?

author: TimFox
author_rank: Super Contributor
timestamp: December 09, 2022, 12:02:55 am
content: As specified, the frequency response should be the same.That assumes you adjust the compensation for each probe.Three differences:How much voltage is safe?Will 1/100 of the input voltage at the oscilloscope input be enough for your application?Is the higher input capacitance of the 10x probe too much for your application?On paper, both probes are compatible with the Fluke.

author: Lachin012
author_rank: Regular Contributor
timestamp: December 09, 2022, 12:09:15 am
content: Quote from: TimFox on December 09, 2022, 12:02:55 amThank you! I will buy the 10x version, since I have one 100x probe, this will be enough for me.

author: bdunham7
author_rank: Super Contributor
timestamp: December 09, 2022, 12:12:46 am
content: Quote from: Lachin012 on December 08, 2022, 11:21:58 pmIs that 380Vrms? Is it mains voltage? If so you are still going to have the issue of the signal not fitting on the screen at 10V/div. What does the scope go up to? If it is mains, I'd highly recommend the 100X. You can use 100X probe down below the 1V level without any issues. And on mains, the 5kV rating leaves a lot more room for surges and spikes. However well mine have worked for me, I'd be a bit nervous using them on mains voltages.

author: Lachin012
author_rank: Regular Contributor
timestamp: December 09, 2022, 12:30:08 am
content: Quote from: bdunham7 on December 09, 2022, 12:12:46 amI mainly repair household appliances electronics, these are control boards from household appliances, mostly there is constant voltage, also inverter boards for air conditioners, also alternating voltage 220v, but I would like to take probes with a margin of up to 380v.