IEEE-488 Reference
3-96
Query :REFerence? Query programmed reference value
:REFerence? DEFault Query *RST default reference value
:REFerence? MINimum Query lowest allowable reference value
:REFerence? MAXimum Query largest allowable reference value
Description These commands are used to establish a reference value for the specified function. When Ref-
erence is enabled (see :REFerence:STATe), the result will be the algebraic difference between
the input signal and the reference value:
Reading = Input signal - Reference
On the ohms function, the input signal is considered to be the computed resistance value seen
at the input. Thus, the final result is the algebraic difference between the input resistance and the
reference. Note that a reference for the current component of a resistance measurement can be
established (see :CREFerence for details).
From the front panel, reference is called relative (REL). See Section 2 for more information on
REL.
The :REFerence <n> command is coupled to the :ACQuire command. The last command sent
(:REFerence <n> or :ACQuire) establishes the reference. When a reference is set using the
:REFerence <n> command, the :REFerence? query command returns the programmed value.
Conversely, when a reference is set using the :ACQuire command, the :REFerence? query com-
mand returns the acquired reference value.
:STATe <b>
[:SENSe[1]]:VOLTage[:DC]:REFerence:STATe <b> Control reference for Volts
[:SENSe[1]]:CURRent[:DC]:REFerence:STATe <b> Control reference for Amps
[:SENSe[1]:RESistance:REFerence:STATe <b> Control reference for Ohms
[:SENSe[1]]:CHARge:REFerence:STATe <b> Control reference for Coulombs
Parameters <b> = 1 or ON Enable reference
0 or OFF Disable reference
Query :STATe? Query state of reference
These commands are used to enable or disable Reference for the specified function. When en-
abled, the displayed reading will include the programmed reference value (see :REFerence <n>
and :ACQuire). When disabled, the displayed reading will not include the reference value.
:ACQuire
[:SENSe[1]]:VOLTage[:DC]:REFerence:ACQuire Acquire Reference; Volts
[:SENSe[1]]:CURRent[:DC]:REFerence:ACQuire Acquire Reference; Amps
[:SENSe[1]:RESistance:REFerence:ACQuire Acquire Reference; Ohms
[:SENSe[1]]:CHARge:REFerence:ACQuire Acquire Reference; Coulombs
Description When one of these commands is sent, the measured input signal is acquired and established as
the reference value. This command is typically used to zero the display. For example, if the in-
strument is displaying a 1nA offset, sending this command and enabling Reference (see :STATe)
zeroes the display.
This command is functional only if the instrument is on the specified measurement function.
Sending this command while in any other function causes an error. Also, if the latest reading is
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