6243/44 DC Voltage Current Source/Monitor Operation Manual
4.10 Computing Functions
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4.10 Computing Functions
4.10.1 NULL Calculation
The NULL calculation is a calculation for canceling leak current, off set values, etc.
(a) Calculation expression
R = X - Xnull X: Current measurement data
Xnull: Null data
(b) Timing of acquiring NULL data (Xnull)
• After the NULL operation is set to ON, the next measured data is acquired as NULL data.
• The timing of NULL data acquisition in DC operation is shown below.
Figure 4-20 Timing of NULL Calculation
• Rewriting of NULL data is performed when a NULL calculation is switched from OFF to ON,
and when initialization is carried out.
• When the NULL data is over range data, all subsequent NULL operation results become over
range data.
• When the NULL operation result exceeds the full scale of the current measurement range, they
are indicated at the next higher range.
• Changing the measurement function can turn OFF NULL operation.
• The measurement auto range cannot be lowered below range in which the NULL data were ac-
quired.
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