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D9 to BNC adaptor

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D9 to BNC adaptor

Postby jtk » Thu Apr 13, 2017 4:51 pm

Hello,

Just bought the new 4444 scope.
If I want to make differential measurement using ordinary 4 mm banana test leads, which adaptor should I use?
TA271 or TA299?
And a BNC to banana adaptor after that of course.
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Re: D9 to BNC adaptor

Postby jtk » Fri Apr 14, 2017 6:08 am

I suppose I need to use the D9 to double BNC and connect my signal between the two center leads, leaving the shields unconnected.
Please correct me if I am wrong.
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Re: D9 to BNC adaptor

Postby Martyn » Fri Apr 14, 2017 8:15 am

What signals are you trying to measure ?
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Re: D9 to BNC adaptor

Postby jtk » Fri Apr 14, 2017 9:00 am

This is just a general question. I do not want to connect my test object to ground via the scope. That was the reason that I bought the 4444.
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Re: D9 to BNC adaptor

Postby jtk » Fri Apr 14, 2017 9:11 am

Another question related to this.

I have several AC clamp on probes.
I tested to measure starting current of a motor, using the 200 A range which gives 1 mV/A.
I was using the D9 to single BNC adaptor and adaptor from BNC to banana plug. Connected the probe to the banana side of the BNC to banana adaptor.
I noticed a lot of noise in the signal.
My question is if the results would be better if I use D9 to double BNC adaptor and connect the probe to the two positive banana connections and leave the negatives unconnected.
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Re: D9 to BNC adaptor

Postby Martyn » Fri Apr 21, 2017 7:34 am

Could you post a psdata file with an example of the noise. These are 12/14 bit, fast sampling scopes, so can often see more than you are used to.

We have now added connection diagrams to the probe pages to show where the connections go TA271 and TA299 so you can see the difference with using the dual and single BNC connections.
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Re: D9 to BNC adaptor

Postby bennog » Fri Apr 21, 2017 4:32 pm

Martyn wrote:We have now added connection diagrams to the probe pages to show where the connections go TA271 and TA299 so you can see the difference with using the dual and single BNC connections.


It would be nice to have the pin numbers and signals of the DB9 connector documented also.
I could not find it in the 4444 documentation.

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Re: D9 to BNC adaptor

Postby Martyn » Mon Apr 24, 2017 10:08 am

This information is currently not available, for third party probes you need to use the 9 way to BNC adaptors.
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