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Delta mode + field logging

6220, 6221 Current Sources
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F_CHEM_
Posts: 7
Joined: March 31st, 2015, 6:26 am
Country: United Kingdom

Delta mode + field logging

Post by F_CHEM_ » April 14th, 2015, 2:03 am

Hello,

I am using Delta measurement mode with the 6221 and 2182A/E and wanted to use CH2 to log the magnetic field at each data point (just another voltage between -1V and 1V).

Is it possible to do this remotely with this set up? I.E. CH1 doing delta measurements and CH2 logging the field?


Thanks

Norbert W
Keithley Applications
Keithley Applications
Posts: 227
Joined: October 21st, 2010, 7:18 am
Country: Germany

Re: Delta mode + field logging

Post by Norbert W » April 14th, 2015, 2:27 am

Hello,

with remote control this should be doable but I strongly believe you would have to reprogram the unit each time you
want to change from a delta reading on channel 1 to a reading on channel 2.
This said I would prefer a separate voltmeter if time matters for you; in this case tapping the 6221 output trigger
for triggering the voltmeter to get synchronous readings is favorable (the 'delta triggering sequence' in the manual
- the timing on Fig. 5-8 of the reference manual).

F_CHEM_
Posts: 7
Joined: March 31st, 2015, 6:26 am
Country: United Kingdom

Re: Delta mode + field logging

Post by F_CHEM_ » April 14th, 2015, 3:20 am

Thanks for your response.

I did think this would have to be the way forward, I need as fast measurements as possible so this triggering will be necessary. I wanted to avoid this as it will be an over complication but it looks like I will have to do it!



I am also having a further problem.

When I read from the device it appears to be adding random readings, i.e. a space, or the last delta reading or DLC. I cannot seem to work out where they are coming from.

Is there a way to completely remove the messages waiting to be read from the 6221?

F_CHEM_
Posts: 7
Joined: March 31st, 2015, 6:26 am
Country: United Kingdom

Re: Delta mode + field logging

Post by F_CHEM_ » April 14th, 2015, 3:38 am

I am already triggering the 2182 with the trigger link cable supplied..

I need to split this so it also goes to a keithley 2100, which takes a BNC trigger. Is there some kind of splitter which can do this for me?



[EDIT]

What Pin is the output trigger? Pin 2?

Norbert W
Keithley Applications
Keithley Applications
Posts: 227
Joined: October 21st, 2010, 7:18 am
Country: Germany

Re: Delta mode + field logging

Post by Norbert W » April 15th, 2015, 2:11 am

Hello,

the below - shows the available trigger accessories with their according model numbers for ordering:
trigger_accessories.JPG
trigger_accessories.JPG (110.09 KiB) Viewed 22909 times

Norbert W
Keithley Applications
Keithley Applications
Posts: 227
Joined: October 21st, 2010, 7:18 am
Country: Germany

Re: Delta mode + field logging

Post by Norbert W » April 15th, 2015, 2:13 am

Hallo,

on the 2182A nanovoltmeter
Tlink line 1 is VMC (voltmeter complete = output trigger from the 2182A)
Tlink line 2 is EXT (external trigger input line for the 2182A)

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