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Agilent 34401A Hidden 10mA AC current range

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babysitter:
Call me interested in switching off the current source!

alex.forencich:
Interesting.  I installed the IntuiLink package in a VM and found the example files.  Looks like it uses 4 different POKEs:

DIAG:POKE -2,4281,0 with no particular comment, presuming 'close front end relay'

DIAG:POKE -2,4281,4 with comment 'open front end relay'

DIAG:POKE -2,3512,0 with comment 'force front end conf to change'

DIAG:POKE 1,0,0 with comment 'force front end conf to be sent'

Basically, the code works like this:

put instrument in 2 wire ohms mode and send first poke
put instrument in 4 wire ohms mode
wait
take current source on measurement
send other 3 pokes to open relay
wait
take current source off measurement
subtract

babysitter:
Unrelated rant: Just called Agilent Service, I sent them a workplace 34401A for calibration on Feb 9th,
ordered a calibration in their InfoLine service upfront, had a written order in the package and thought everything is well...
Wrong. They send me a email with a quote asking for confirmation, which I answered on 26th.

Still not enough, today i got:     Received 02/12/2014. Awaiting quote approval

Called, they skipped my mail but promised everything goes fine from today.

 :wtf:

coromonadalix:
Just found an vb example of this   from an intuilink installation file 

IMPORTANT NOTE:  This program describes an UNSUPPORTED CAPABILITY of the
Agilent 34401 Multimeter.  Agilent does not warrant or support the
performance or use of this feature in any manner.

Some customers want to measure lower ACI than the 1 A range allows.  The
lowest specified measurement on the 1 A range is 1% of range, or 10 mA
(see footnote 4 in data sheet).
 
The code below enables a hidden 10 mA ACI range. 
 
------------------------------------------------------------------------
 
10    !
20    !
30    ! The following program makes several ACI readings using
40    ! the undocumented 10 mA range.
50    !
60    ! The current range is enabled using the BUS and a DIAG:POKE 25,0,1
70    ! command.  Once enabled, the range can be accessed over the
80    ! BUS or from the front panel.  You can still access the range
90    ! even if power is cycled.  To disable the range you need to
100   ! to send a DIAG:POKE 25,0,0 command.
110   !
120   ! BCG 1/6/93
130   !
140   Nrdgs=10   ! NUMBER OF RDGS
150   !
160   ALLOCATE Rdgs(1:Nrdgs)
170   !
180   ASSIGN @Dvm TO 723
190   !
200   ! DIG OUT PREVIOUS ERRORS
210   !
220   CLEAR 7
230   REPEAT
240    OUTPUT @Dvm;"SYST:ERR?"
250    ENTER @Dvm;A,A$
260    PRINT A,A$
270   UNTIL A=0
280   PRINT "-----------------------------------------------------------"
290   !
300   ! SET UP 34401A
310   !
320   CLEAR @Dvm
330   OUTPUT @Dvm;"*RST"
340   WAIT .5
350   !
360   !
370   OUTPUT @Dvm;"DIAG:POKE 25,0,1"      ! Allows access to 10 mA
380   OUTPUT @Dvm;"CONF:CURR:AC .01,MIN"  ! ACI from the bus and
390   OUTPUT @Dvm;"TRIG:COUN";Nrdgs       ! front panel.
400   OUTPUT @Dvm;"READ?"
410   !
420   FOR I=1 TO Nrdgs
430    ENTER @Dvm USING "#,K";Rdgs(I)
440    PRINT I,Rdgs(I)
450    DISP I,Rdgs(I)
460   NEXT I
470 ! OUTPUT @Dvm;"DIAG:POKE 25,0,0"  ! DISABLE 10 mA RANGE
480   PRINT "-----------------------------------------------------------"
490   END

Brandy:
What is the advantage of the vb program compared to the poke mentioned from macboy in the first post?

Btw, the "autorange" function is working upwards only. e.g. if you measure 10mA 1kHz and input a higher current value, the 34401 will change to the 1A range automatically (if you're in autorange mode). If you change from lets say 15mA/1kHz to 5mA/1kHz it will NOT switch to the 10mA range! This has to be done manually.

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