Model 6485 Picoammeter Instruction Manual Measurement Concepts 2-15
SCPI programming — zero check and zero correct
A) SYSTem:ZCORrect:ACQuire
The zero correct value can only be acquired while zero check is enabled and zero correct
state is off. The internal offset measured at that moment will become the correction value.
Zero correction can then be applied and zero check disabled. This acquire method makes it
convenient if you need to re-zero the instrument often.
The following command sequence uses the acquire method to zero correct the 200µA
range:
*RST ' Set instrument to known default
conditions in one-shot trigger mode.
SYST:ZCH ON ' Enable zero check.
CURR:RANG 2E-4 ' Set instrument to 200uA range.
INIT ' Trigger one reading.
SYST:ZCOR:ACQ ' Acquire zero correct value.
SYST:ZCH OFF ' Disable zero check.
SYST:ZCOR ON ' Perform zero correction.
The INITiate command in the above sequence is used to trigger a reading. This reading is
the offset that is acquired as the zero correct value. See Section 7 for more information on
INITiate.
NOTE Sending the :ACQuire command while zero check is disabled will result in an
error. The command will not be executed.
Table 2-4
SCPI commands — zero check and zero correct
Commands Description Default Ref DDC
SYSTem
:ZCHeck
[:STATe] <b>
:ZCORrect
[:STATe] <b>
:ACQuire
INITiate
SYSTem Subsystem:
Zero check:
Enable or disable zero check.
Zero correct:
Enable or disable zero correct.
Acquire a new zero correct value.
Trigger a reading.
ON
OFF
OFF
A
A
B
B
C0 (Off)
C1 (On)
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