6241A/6242 DC Voltage Current Source/Monitor Operation Manual
5.2.9 Calculation Functions
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5.2.9 Calculation Functions
5.2.9.1 NULL Calculation
NULL calculation is used to cancel leak current or offset value.
a. Calculation expression
R = X - Xnull X: Present measurement data
Xnull: NULL data
b. Timing to acquire NULL data (Xnull)
• After the NULL calculation is set to ON, the next measured data item is acquired as NULL
data.
• The timing of NULL data acquisition in DC operation is shown below.
Figure 5-14 NULL Calculation Timing
• NULL indicator illuminates when NULL calculation is ON.
• Rewriting NULL data is performed when a NULL calculation is set to ON from OFF or when
NULL calculation is initialized.
• If the measured value is over range data and NULL calculation is turned ON, the display shows
Over Range, and the NULL value becomes the first data item after Over Range is released.
• If a NULL calculation result is over the full scale of the present measurement range, it displays
up to the double value of the full-scale. However, ±999.9999 mA for current measurements in
the 500 mA range using the 6241A; ±9.99999 A for current measurements in the 5 A range
using the 6242.
• The calculation is turned OFF by changing the measurement function or executing the *RST
command.
• NULL data can be changed while the NULL calculation is ON.
Select and set items, I) CONST, Null Value on the Menu screen.
The range for setting is between 0 to ±999.999E + 24.
NULL calculation
Measurement
Xnull
Output data
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