Re: Need a CT-3 trigger pick-off for the lab.


Doesn’t look like it unfortunately. It appears that the VP-2 is a impedance matching coupler for the S-3 sampling unit which is 75 Ohms. The CT-3 is a 50 ohm pass through with a 10X of attenuation at the pickoff point. In reading the calibration document a little more closely it looks like all this is doing is using a CT-3 to make a small signal out of an sg-503 for use in the trigger adjustment of the 465. You need to make the trigger adjustments around 20 mv of signal at 10 Mhz. If this is truly the case and all that the CT-3 is used for then I have something in the lab already that will cover this signal. My HP 8657A can easily generate these clean and low level signals so I might be able to get this I think the process is adjust the trigger to fire at 25mV, no trigger at 20mV


-----Original Message-----
From: <> On Behalf Of snapdiode via
Sent: Sunday, May 16, 2021 9:31 PM
Subject: Re: [TekScopes] Need a CT-3 trigger pick-off for the lab.

Would a VP-2 work as well? The difference between a CT and VP seems not too clear to me even after reading the manuals.

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