5½ Digit Multimeter Reference Manual Section 3:
2110-901-01 Rev. C/August 2013 3-47
Digital filter
The digital filter lets you set the filter response to stabilize noisy measurements. The instrument uses
a digital filter, which is based on reading conversions. The displayed, stored, or transmitted reading is
an average of a number of reading conversions (from 2 to 100).
Filtered readings are stored in stack memory. There are two types of digital filter: Moving average and
repeating average.
• The moving average filter places the specified number of reading conversions in a first-in, first-out
(FIFO) order. The first measured reading fills up the stack. The filter averages the readings in the
stack to yield a single reading.
Each subsequent measurement conversion replaces the oldest reading in the stack. The
readings in the stack are again averaged to yield a single reading.
• The repeating average filter waits for the stack to fill with measurement conversions. It then
averages the readings in the stack to yield a single reading. For each subsequent measurement,
the filter flushes the stack, waits for the stack to fill again, and then averages the readings to yield
another single reading.
The digital filter is not available for diode, continuity, frequency, or period measurements.
The digital filter setting is stored in volatile memory. On power-up, the digital filter is disabled.
Front-panel operation
Perform the following steps to set and enable the digital filter for the selected function:
1. Select a measurement function. For example, press the DCV key to select the DC volts function.
2. Press the SHIFT and DIGITS (FILTER) keys.
3. Use the ◄ and ► keys to display the filter type (MOVING AVG or REPEAT AVG) and press
ENTER.
4. Press the ► key to display READINGS and press ENTER.
5. Use the ◄, ►, ▲, and ▼ keys to specify the number of readings to average and press ENTER.
6. With RUN displayed, press ENTER to enable the filter. The FILT indicator turns on when the
digital filter is enabled.
Perform the following steps to disable the digital filter for the selected function:
1. Press the SHIFT and DIGITS (FILTER) keys.
2. Use the ◄ key to display OFF and press ENTER. The FILT indicator turns off.
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