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Re: Testing Scope Probes
The 10073C should have come with a BNC adaptor sleeve. So should your "good" probe. To eliminate all loading and source imedance issues connect a BNC T to the signal generator output and directly
By Robert G8RPI · #143291 ·
Re: Testing Scope Probes
It's made for HP scopes and logic analyzers like the 16500C 16700B... Could be...
By John Griessen · #143290 ·
Re: Testing Scope Probes
Yes, it's a Tek 2465A; the highest bandwidth scope I have.
By Jinxie · #143289 ·
Re: Testing Scope Probes
Thanks for the offer, JMR, I'll see how I get on with some other tests before imposing on you. I have asked a colleague to measure the probe impedance at DC and it's a whisker over 2.2M ohms, so
By Jinxie · #143288 ·
Re: Testing Scope Probes
It's worth adding a 10dB pad at the sig gen output to make sure the source Z is close to 50R and then the effective source impedance driving the probe will be about 25 ohms with the output termination
By jmr · #143287 ·
Re: Testing Scope Probes
Also, when testing with your sig gen you need to terminate the sig gen with a good 50R load. I'd recommend using a short test PCB with some 50R microstrip on it with a good 50R termination at the far
By jmr · #143286 ·
Re: Testing Scope Probes
I have no access to the probe until tomorrow morning. I have not as yet tested to check if it's 2.2M ohms, which sounds like a very simple quick and dirty test and would eliminate it as real or fake
By Jinxie · #143285 ·
Re: Testing Scope Probes
The other thing to do is to make sure you are compensating it correctly. Also, you should see quite a difference in the response of the compensation if it is a genuine 10073C compared to a regular 10M
By jmr · #143284 ·
Re: Testing Scope Probes
Oh yes, didn't take that into account, of course. Raymond
By Raymond Domp Frank · #143283 ·
Re: Testing Scope Probes
I recommend measuring it to see if it is a fake probe? A fake version might have a 10M input. If it is 10M then it's safe to assume it's a fake without doing any more tests. Hopefully, Jinxie already
By jmr · #143282 ·
Re: Testing Scope Probes
Except that at 500MHz, a source sees only the 26Ohm, not 2.2MOhm (nor 10MOhm). What would the benefit to the OP be of testing that the 10073C's input resistance is according to its DC
By Raymond Domp Frank · #143280 ·
Re: Testing Scope Probes
At 500MHz, it's not completely insignificant that the 10073C is a 2.2M probe. By designing for a 2.2Meg input divider (and not a 10Meg divider)? it makes it much easier to achieve good compensation
By jmr · #143279 ·
Re: Testing Scope Probes
Yes, according to the datasheet it's 2.2MOhm (DC). Made completely insignificant against its 500MHz impedance of less than 30Ohm. Its frequency compensation range is specified as 6 - 15pF, as is usual
By Raymond Domp Frank · #143278 ·
Re: Testing Scope Probes
If it helps, I've been using the 10073 series probes for many years. The 10073C scope probe isn't a 10Meg probe, it's more like 2.2Meg. Try measuring it (with a DMM set to ohms) with it connected to a
By jmr · #143277 ·
Re: Testing Scope Probes
1. As Chuck says, you don't really know the behavior of your "500MHz" 10073C on your 350MHz analog 'scope (much) above that 350MHz. Surely, the falloff of the combination isn't Gaussian, as it's
By Raymond Domp Frank · #143276 ·
Re: Testing Scope Probes
What is bandwidth? The classic definition is when the measured voltage is at the half power point, which is 0.707 x V (to be measured). So, your 350MHz scope should show at least 0.707V for a 1V
By Chuck Harris · #143275 ·
Testing Scope Probes
Hi all, There's some seller on Ebay offering Agilent 10073C oscilloscope probes at a knock-down price and naturally I bought one like a complete idiot would. Anyway, this is supposed to be a 500Mhz
By Jinxie · #143274 ·
Re: HP/Symmetricom 58531A GPS Timing Receiver Analysis & Control software
Might be wirth trying Microchip who now own the IP https://www.microchip.com/en-us/support/access-fts-technical-resources Robert G8RPI.
By Robert G8RPI · #143273 ·
Re: Hp 8720ES firmware.
Hi all, 8753D has an older Motorola CPU than the E/ES/ET revisions and updated CPU board with flash memory instead of UV-EPROM for the firmware. Peter I suggest that you desolder the EEPROMS on both
By Marcus Gustafsson · #143272 ·
Re: Agilent 54622D with broken digital inputs - Fixable?
Asking politely was part of the process. :) The gold was recovered from the solution and the Nobel Committee had the medals recast from that. --Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 420
By Tom Lee · #143271 ·
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