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RIGOL

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. The null measurement enhance the accuracy by off set test lead

impedance. 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

±120% of

the highest range, for the present function.

Press Æ Null, the display shows:

Figure 2- 4

Table 2- 5 Null Measurement 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.

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