Switching between channels on signal generator

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MTC

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May 21, 2018, 3:10:19 PM5/21/18
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I am learning python and trying to write a code for a Berkeley Nucleonics 845 signal generator and I need to switch between channels 1 and 2 to proportionally change the frequency. For now I have this code which turns the first output channel on without any error. 

However, when I change the output to 2 it still turns on the output 1 instead of 2. I'm not sure why. I am also hoping for some insight into turning the output channel off or turning both of them on. 

The commands to turn it on I have been using are :


sgn.write("FREQUENCY:MODE CW")
time.sleep(0.1)
sgn.write("OUTPUT 1")
time.sleep(0.1)


Thanks for any help

Alex Forencich

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May 21, 2018, 4:12:02 PM5/21/18
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If I'm not mistaken, that instrument only has 1 output channel, so, what, exactly, are you trying to do?

Alex Forencich
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MTC

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May 21, 2018, 4:36:41 PM5/21/18
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It is a dual output. The reason I am writing this code is to simulate a dual sweep with the frequencies changing in proportion to one another.

Alex Forencich

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May 21, 2018, 4:40:17 PM5/21/18
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Oh, are you using an 855 and not an 845, then?

Looks like you need to add the channel number to the command, so instead of output 1 to turn on the output, you would use output1 1 or output2 1.  

Alex Forencich

MTC

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May 21, 2018, 4:48:40 PM5/21/18
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it is an 845 but they're super similar. Thanks for the advice! I will try that. :)

sporks...@gmail.com

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May 21, 2018, 4:50:51 PM5/21/18
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Would

 

sgn.write("OUTPUT1 0")
sgn.write("OUTPUT2 0")

 

turn off the outputs for him?   I haven’t written Python code in a long time and don’t use python-ivi (but am very interested in the this mailing list and the progresses made), so please forgive me if this is the incorrect command to turn off the outputs for him.   Just thought I’d try to help (and hopefully, not mislead him).

 

Kenneth Swarthout

Alex Forencich

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May 21, 2018, 4:55:53 PM5/21/18
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Yeah, that looks right, at least according to the manual.  For changing the frequency, it seems the correct command would be something like

sgn.write("SOURCE1:FREQUENCY:CW 1e9")

and for the other channel:

sgn.write("SOURCE2:FREQUENCY:CW 1e9")


Alex Forencich

MTC

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May 21, 2018, 4:58:46 PM5/21/18
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what manual are you using? can you link it? 

Alex Forencich

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May 21, 2018, 5:02:14 PM5/21/18
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