SECTION 4
IEEE-488 Reference
4.2.3
C - Zero Check and Zero Correct
Purpose
Use to cancel any internal offsets that might affect accuracy.
Format
Cn
Parameters
co
Cl
c2
Disable zero check
Enable zero check
Enable zero check and perform zero correction
Default
Upon power-up, or after receiving a DCL or SIX command, the instrument will return to
the state (CO or Cl) that was saved as the default condition. The instrument will return to
zero correction parameters that are saved as default conditions.
Description
Normal current measurements are performed when zero check is disabled (CO). When
zero check is enabled (Cl), a large impedance (lOOk& appear at the input and any inter-
nai offset is presented at the output of the input amplifier and measured (see paragraph
3.5.3).
When c2 is sent over the bus, zero check is enabled and zero correction occurs. For zero
correction, the measured of&et is stored and algebraically subtracted from subsequent
readings. After correction is performed, zero check returns to its previous state (enabled
or disabled). A separate zero correction needs to be performed for each range.
Programming
Notes
1. Zero correction should be performed whenever the display is not zeroedwhen in zero
check.
2. The specifications at the front of this
manual
assume that the instrument has been
properly zeroed.
3. When in autorange, zero correction will be performed on the range the instrument is
currently in.
Programming
Example
OUTPUT 722; ‘XIX”
OUTPUT 722; “c2x”
! Select 1nA range.
! Zero comect InA range
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