Fluke PM3370B Key to switch the Average function on or off, Control to select the Average factor

5 - 14 FUNCTION REFERENCE

AVERAGE

Description:

Valid in digital mode only.

Averaging is a process to reduce random noise without losing bandwidth. Averaging can only be used for repetitive signals.

Every sample point is calculated after every subsequent acquisition as follows:

measured – previous new = previous + -----------------------------------------------------------

C

In this formula "previous" is the result of the average function after the previous acquisition, on the same sample position as the measured one. "C" is the average-factor. Noise is reduced by a factor which is equal to the square root of "C".

Average values for "C" can be selected from 2 to 4096 in a binary sequence. To do so, use the TRACK control in the ACQUIRE menu.

Averaging also results in a higher vertical resolution resulting in higher measurement accuracy.

Averaging can be quickly switched on and off with the direct access key (AVERAGE) on the front panel, or via the ACQUIRE menu. Once activated, average is a continuous process until it is switched off. However, whenever the display is changed (e.g. POS, AMPL/DIV) the average process will restart.

AVERAGE is mutually exclusive with ENVELOPE. If the ENVELOPE mode is selected, AVERAGE is automatically switched off.

Key sequence:

AVERAGE

ACQUIRE

Key to switch the AVERAGE function on or off.

TRACK

Control to select the AVERAGE factor.

ST6555

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