problem with Agilent B2900 Series drives

[billko]

I guess you're missing a : after RANG.

[dkfire · Accepted solution]

if it is missing, i think it should be before rather than after. 

According to the programming manual it should be: 

:SOUR1:VOLT:RANG:AUTO ON;AUTO:LLIM 2.000000;:SOUR1:VOLT:RANG 2.000000;:SOUR1:VOLT 0.000000;VOLT:TRIG 0.000000;:SOUR1:FUNC DC;FUNC:MODE VOLT;TRIG:CONT ON;

[JÞB · Accepted solution]

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@billko wrote:

I guess you're missing a : after RANG.

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Bad guess.

SCPI commands start a root or ":" then traverse command trees with colons and semi colons.

Eg :System:sub1:sub2:param1 val;param2 val is the same as :System:sub1:sub2:param1 val

:System:sub1:sub2:param2 val 

Because the semicolon backs up 1 tree level

So the silly

:SOUR1:VOLT:RANG:AUTO ON;AUTO:LLIM 2.000000;RANG 2.00000

Is really 3 commands

:SOUR1:VOLT:RANG:AUTO ON

:SOUR1:VOLT:RANG:AUTO:LLIM 2.000000

:SOUR1:VOLT:RANG:AUTO:RANG 2.000000

Looking at the second and third we can see somebody done something wrong.  I'd guess the individual commands were shortened with semicolons and then reordered after a code review.  Oops. 

The command parser can probably forgive the second command since AUTO and llim are at the same level.  But, range:auto:range is going to require penance. 

Unfold the semicolons and use the output of mode ( either :SOUR1:Volts or SOUR1:Current) as the staring string for the other parameters.  And you should select either RANG:AUTO ON or RANG:AUTO OFF; %g .

Then provide the feedback to the IDN site 

[User002]

Hi, thank you so much for suggestion.

Now the issue has been solved by adopting your suggestion.

Very crucial point is, we need to predefine the channel and Current/Voltage when using RANG, which was omitted in the original IV provided.

:SOUR1:VOLT:RANG:AUTO ON;AUTO:LLIM 2.000000;:SOUR1:VOLT 0.000000;VOLT:TRIG 0.000000;:SOUR1:FUNC DC;FUNC:MODE VOLT;TRIG:CONT ON;

Thanks again for all your help !!