6240B DC Voltage Current Source/Monitor Operation Manual
5.2.10 Calculation Functions
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5.2.10 Calculation Functions
5.2.10.1 NULL Calculation
NULL calculation is used to cancel leak current or offset value.
a. Calculation expression
R = X - Xnull R: Calculation result
X: Present measurement data
Xnull: NULL data
b. Timing to acquire NULL value (Xnull)
• After the NULL calculation is set to ON, the next measured data item is acquired as NULL
value.
• The timing of NULL value acquisition in DC operation is shown below.
Figure 5-14 NULL Calculation Timing
• The NULL indicator goes ON when the NULL calculation is ON.
• The NULL value is rewritten when the NULL calculation switches from OFF to ON or when
the NULL calculation is initialized.
• If the measured value is over-range data and the NULL calculation is turned ON, the display
shows Over Range. The first data item after the Over Range is released becomes the NULL
value.
• If the NULL calculation result is over the full scale of the present measurement range, it dis-
plays up to the double value of the full scale.
• The NULL calculation is turned OFF by changing the measurement function or executing the
*RST command.
• The NULL value can be changed while the NULL calculation is ON.
Select and set items, I) CONST and Null Value on the menu screen.
The setting range is between 0 and 999.999E + 24.
NULL calculation
Measurement
Xnull
Output data
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