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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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31st Jul 2017, 3:24 pm | #1 |
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Philips 'scope probe, PM 9358/01
Re: thread title: recently acquired; it's brand new & unused; came as a complete boxed kit. It's a 100:1 type; mechanical design more-or-less standard - except for two things:
(a) the probe 'input' end. The diameter of the earth ring at that end is too large to fit a probe-to-BNC female socket / adapter. (Nor any other type of R.F. connector that I know of). Was one ever made? Is such an item available? (b) there are two probe attachments: the type for hooking the probe to a wire. One is conventional and fits the probe; the other looks conventional, but its internal diameter is too small to fit the probe. So, why is it in the kit? And does anyone have any idea of its -3dB (and -1dB) bandwidth? (With its earth lead attached, -1dB seems to be in the region of 50 → 75 MHz. But that's with its earth wire connected to source whose Zout is 50 Ω . . . . ) In addition to those Qs., if someone can direct me to where I can find the manual for this probe, most (if not all) of those Qs. should be answered. Thank you. Al. |
31st Jul 2017, 3:44 pm | #2 |
Hexode
Join Date: Aug 2014
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Re: Philips 'scope probe, PM 9358/01
Download a copy of the PM3226 service manual, it is covered on page 94
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31st Jul 2017, 3:48 pm | #3 |
Dekatron
Join Date: Jun 2016
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Re: Philips 'scope probe, PM 9358/01
(b) Probably chucked in the box from another probe.
Philips tend to use rise time on probes. So in that case it says 1.2nS. Relationship is " bandwidth = 0.35 / risetime " so that's about 290MHz. You won't get anywhere near the quoted bandwidth without using the probe tip ring as ground rather than the provided ground strap. Might have to bodge an in circuit termination like the following picture: https://i.stack.**********/cbLXI.png As for manual, I can't help I'm afraid. Edit: ignore first (a) response. Wrong end of wire! I haven't seen one unfortunately. Last edited by MrBungle; 31st Jul 2017 at 3:54 pm. |
31st Jul 2017, 6:09 pm | #4 | |
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Re: Philips 'scope probe, PM 9358/01
Quote:
Second para: Yes, I'm well aware of that: thanks anyway. Al. |
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31st Jul 2017, 6:43 pm | #5 | |
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Re: Philips 'scope probe, PM 9358/01
Quote:
But it did discover that its B/W is such that it is intended for use with 'scopes that have a 150 MHz B/W. That's quite adequate for my expected needs; my Tek. 2465 is 'flat' to 100 MHz (Tek. claim a 300 MHz B/W - which, of course, is -3 dB on its LF response). Al. |
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2nd Aug 2017, 6:58 pm | #6 |
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Re: Philips 'scope probe, PM 9358/01
Question (b) now solved - with the help of a bit of lateral thinking! The probe slide-on sleeve is actually in two parts. The end from which the retractable hook emerges is unscrewable from the rest of that sleeve. So the 'mystery' item is, in point of fact, a replacement part for that bit. And to me, that is a replacement part, readily to hand, which will probably be really welcome one day. Clever thinking by Philips.
Al. |
2nd Aug 2017, 7:12 pm | #7 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
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Re: Philips 'scope probe, PM 9358/01
Mystery solved and a good piece of engineering in the end. Nice to know!
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3rd Aug 2017, 10:45 pm | #8 |
Hexode
Join Date: Apr 2007
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Re: Philips 'scope probe, PM 9358/01
Here some specs from advertizing 1974
Peter |
16th Sep 2017, 10:28 pm | #9 |
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Re: Philips 'scope probe, PM 9358/01
This thread has clearly run its course: time for its closure.
Al. / Sept. 16th. |
16th Sep 2017, 10:48 pm | #10 |
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Re: Philips 'scope probe, PM 9358/01
The non-standard bigger ground ring is for clearance because 100:1 probes are usually needed for testing high voltage things. other 100:1 probes may have accessories which fit.
David
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