RIGOL M300 - Manual (Page 54)

RIGOL
© 2007 RIGOL Technologies, Inc.
User’s Guide for DM3000 Series
2-6
Null Measurement
The DM3000 null settings is available for DC voltage, AC voltage, DC current, AC
current, resistance, frequency/period, and capacitance measurements.
With null setting each measurement is the difference between a stored null value
and input signal. It is particularly important prior for making capacitance
measurements. The formula used for calculating null measurements is:
Result = reading - null value
The null value is adjustable, and can be set to any value between 0 and
± 1 20% of
the highest range, for the present function.
Press  Null, the display shows:
Figure 2- 4 Set the NULL Value
Table 2- 5 Menu Description
Function Menu Description
Current Use the measured value as the null value.
Clear Set the value to be zero.
On/Off Turn the Null function on or off.
Save all changes, back to a higher level menu.