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Thread: Open close relay in 34901A


Permlink Replies: 5 - Pages: 1 - Last Post: Feb 13, 2012 8:43 PM Last Post By: afdzalnazri Threads: [ Previous | Next ]
afdzalnazri

Posts: 8
Registered: 02/09/12
Open close relay in 34901A
Posted: Feb 9, 2012 3:27 AM
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Hi,

I am very new with 34901A and 34970A data acquisition.

I connected wires at 34901A, H and L terminal in channel 103 and then connect the both wire end with multimeter to check the continuity. After that i set the channel 103 to close and nothing happen. So I set for open, still nothing happen.

Will this open close will act like switch? How can I make it like a switch?

how can I use the open close function at 34901A?

how is the wiring?
Will the wiring be at the H L terminal inside the mux?

Thank you.
tomc

Posts: 216
Registered: 01/12/11
Re: Open close relay in 34901A
Posted: Feb 9, 2012 3:28 PM   in response to: afdzalnazri in response to: afdzalnazri
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The 34901A channels provide a path to the internal voltmeter as well as to the COMmon terminals on the 34901A. It you just want to use the 34901A as a switch to rout signals from the channel terminals to the com terminals, connect your external voltmeter to the com H & L terminals, short the wires connected to the channel terminals together and measure the resistance. Alternatively just configure the channel for a 2-wire resistance measurement as shown in the manual and use the 34970A to check the continuity. Look at the 34901A diagram in the manual to see how the signals are routed. You can find the manual at www.agilent.com/find/34401A.
afdzalnazri

Posts: 8
Registered: 02/09/12
Re: Open close relay in 34901A
Posted: Feb 9, 2012 6:29 PM   in response to: afdzalnazri in response to: afdzalnazri
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Thank you. My problem solved. I refer to this http://www.metrictest.com/catalog/pdfs/product_pdfs/agilent_34901.pdf, page 18 for the wiring to do the open close switching to the relay.

Thank you again
afdzalnazri

Posts: 8
Registered: 02/09/12
Re: Open close relay in 34901A
Posted: Feb 9, 2012 6:44 PM   in response to: afdzalnazri in response to: afdzalnazri
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Now, how can I make a measurement while turn on the switching?

To make the relay close or open, I need to OFF all the channel. how can I close channel 103 and make ohm measurement at channel 101?
tomc

Posts: 216
Registered: 01/12/11
Re: Open close relay in 34901A
Posted: Feb 10, 2012 10:30 AM   in response to: afdzalnazri in response to: afdzalnazri
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This is a very unusual application and it can't be done with the 34970A and one 34901A. The DMM can only be configured for a measurement with a channel list and then the entire module committed to a scan. Even if it could be done, you would be measuring the parallel combination of what is connected to channel 101 and 103. Is that what you want to do? You could do that by using the bank 1 common terminals instead of channel 103, but then that would be in parallel with all channels on bank 1. Alternatively, you could use two 34901A modules and connect the common terminals of both modules. Then you can close channels on module 2 independently of what measurements are configured for module 1.
afdzalnazri

Posts: 8
Registered: 02/09/12
Re: Open close relay in 34901A
Posted: Feb 13, 2012 8:43 PM   in response to: afdzalnazri in response to: afdzalnazri
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Thank you tomc.

I'm now using two separate modules, 1 for scanning and the other one for measuring.

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