ADCMT 6253 - NULL Calculation Timing

6253 DC Voltage Current Source/Monitor Operation Manual
4.2.9 Calculation Functions
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4.2.9 Calculation Functions
4.2.9.1 NULL Calculation
NULL calculation is used to cancel leak current or offset values.
a. Calculation expression
R = X - Xnull R : Calculation result
X : Present measurement data
Xnull : NULL value
b. Timing of acquiring 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 4-15 NULL Calculation Timing
•“NULL” is displayed 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
displays 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, 9) Const and 6) NULL Value on the menu screen.
The setting range is between 0 and 999.9999E + 24.
NULL calculation
Measurement
Output data