Model 2750 Multimeter/Switch System User’s Manual Range, Digits, Rate, Bandwidth, and Filter 4-15
For voltage, current, and resistance, the filter window is expressed as a percent of range.
For example, on the 10V range, a 10% window means that the filter window is ±1V. For
temperature, the filter window is expressed as a percent of the maximum temperature
reading. The maximum temperature depends on which thermocouple is being used. For
example, for a Type J thermocouple, the maximum reading is 760°C; a 10% window
means that the filter window is ±76°C.
Filter type — There are two digital filter types: moving and repeating. The moving aver-
age filter uses a first-in, first-out stack. When the stack becomes full, the measurement
conversions are averaged, yielding a reading. For each subsequent conversion placed in
the stack, the oldest conversion is discarded, and the stack is re-averaged, yielding a new
reading. This process is depicted in Figure 4-2A.
For the repeating filter, the stack is filled and the conversions are averaged to yield a read-
ing. The stack is then cleared and the process starts over (Figure 4-2B). The repeating fil-
ter is used for scanning so readings from other channels are not averaged with the present
channel.
NOTE The moving filter cannot be used when scanning. If a scan channel is set up to
use the moving filter, the filter will not turn on. Scanning is covered in Section 7.
2750-900-01.book Page 15 Wednesday, August 3, 2011 7:56 AM
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