Keithley 2001 Operator's Manual page 290

IEEE-488 Reference
Formats
Description
Programming example
4-132
:ACQuire
[:SENSe[1]]:CURRent:AC:REFerence:ACQuireAcquire Reference for ACI
[:SENSe[1]]:CURRent[:DC]:REFerence:ACQuireAcquire Reference for DCI
[:SENSe[1]]:VOLTage:AC:REFerence:ACQuireAcquire Reference for ACV
[:SENSe[1]]:VOLTage[:DC]:REFerence:ACQuireAcquire Reference for DCV
[:SENSe[1]]:RESistance:REFerence:ACQuire Acquire Reference for 2
[:SENSe[1]]:FRESistance:REFerence:ACQuire Acquire Reference for 4
[:SENSe[1]]:FREQuency:REFerence:ACQuire Acquire Reference for FREQ
[:SENSe[1]]:TEMPerature:REFerence:ACQuireAcquire Reference for TEMP
:curr:ac:ref:acq :curr[:dc]:ref:acq
:volt:ac:ref:acq:volt[:dc]:ref:acq
:res:ref:acq:fres:ref:acq
:freq:ref:acq:temp:ref:acq
When one of these commands is sent, the measured input signal will be acquired and established
as the reference value. This command is typically used to zero the display. For example, if the
instrument is displaying a 2mA offset, sending this command and enabling Reference (see
:STATe) will zero the display.
This command is functional only if the instrument is on the specified measurement function.
Sending this command while in any other function will cause an error. Also, if the latest reading
is overflowed ("OFLO") or a reading has not been triggered ("----"), an error will occur when
this command is sent.
The :ACQuire command is coupled to the :REFerence <n> command. The last command sent
(:ACQuire or :REFerence <n>) will establish the reference. When a reference is set using the
:ACQuire command, the :REFerence? query command will return the acquired reference value.
Conversely, when a reference is set using the :REFerence <n> command, the :REFerence? que-
ry command will return the value sent with the :REFerence <n> command.
10 OUTPUT 716; ":func 'curr:ac' :curr:ac:ref:acq; stat on"
20 OUTPUT 716; ":curr:ac:ref?"
30 ENTER 716; A$
40 PRINT A$
50 END
Line 10 Three commands on this line; the first selects the ACI function, the second acquires
the displayed reading as the reference, and the third enables Reference.
Line 20 Queries the programmed reference value.
Line 30 Addresses the Model 2001 to talk.
Line 40 Displays the programmed reference value.
2001-900-01 Rev. K / August 2010