RIGOL
2-6 © Copyright RIGOL Technologies, Inc. 2007.
User Manual for DM3000 Series
Null Measurement
The DM3000 allows separate null settings to be saved for each of the following
measurement functions: dc voltage, ac voltage, dc current, ac current, resistance,
frequency/period, and capacitance.
When making null measurements, each reading is different between a stored
(selected or measured) null value and the input signal. One possible application is to
increase the accuracy of two–wire resistance measurements by nulling the test lead
resistance. Nulling the leads is particularly important prior to making capacitance
measurements. The formula used for calculating null measurements is:
Result = reading – null value
The null value is adjustable, and you can set it to any value between 0 and
±120% of
the highest range, for the present function.
Press Æ Null , enter the menu shown below:
Figure 2-5
Table 2-6 Null Measurement Menu Explanation
Function Menu Explanation
Current The current measured value will be the setting 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.
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