7451A/7461A/7461P Digital Multimeter Operation Manual
5.9.2 Smoothing Calculation
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• Decimal point
3. Change the setting value by using and at the blinking position.
The unit prefix is switched according to the following order.
p n m No unit prefix k M G T
4. Press to apply the setting.
4. Canceling the NULL calculation
The NULL calculation is canceled when any of the following conditions occur.
• The key is pressed while the NULL calculation is performed.
• The *RST command is executed.
5.9.2 Smoothing Calculation
1. Function
The smoothing function is used when the noise is superimposed on the measurement signal. Because
the measurement values in the specified number of times (smoothing count) are calculated by using
the moving averaging method, the dispersion of the measurement values becomes small.
The smoothing calculation equation is shown below.
When the key is pressed, the calculation is performed and the SM lamp in the display section
turns on or blinks.
When the key is re-pressed while the smoothing calculation is performed, the calculation is
canceled and the SM lamp turns off.
The SM lamp blinks from the smoothing start to the (N - 1)th measurement and turns on after the Nth
measurement.
The (N + 1)th data is shown below.
The average of the measurement values, which have been acquired, is displayed from the smoothing
start to the (N - 1)th measurement.
Display = (Measurement value 1 + , , , , , + Measurement value N) / N
Display = (Measurement value 2 + , , , , , + Measurement value (N + 1)) / N
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