Front Panel Operation
3-90
Choosing the filter parameters for each function follows the
same procedure. You can program a digital filter as follows:
1. There are three ways to display a filter configuration
menu:
• To configure the filter of the present function, just
press CONFIG, then FILTER.
• To configure the filter of another function and remain
in the present function, press CONFIG, and the ap-
propriate function key, then select FILTER from its
menu.
• To configure the filter of another function and change
to that function, press the appropriate function key,
and CONFIG, then FILTER.
2. As an example, consider the DCV digital filter menu.
Display the CONFIGURE DCV menu by pressing the
CONFIG key and then the DCV key.
3. Use the cursor keys ( and ) to place the cursor on
FILTER and press ENTER to access the following
menu:
DCV DIGITAL FILTER
AUTO AVERAGING ADVANCED
AVERAGING-MODE
AUTO
This menu item selects auto filtering. When chosen, auto fil-
tering enables the filter parameters listed in Table 3-17 for
the function you are presently configuring. Note that select-
ing AUTO immediately enables the filter for that function
when the state listed in Table 3-17 is ON. In this case, if you
are configuring the filter for the present measurement func-
tion, the FILT annunciator comes on.
AVERAGING
Use this selection for a non-windowed averaging filter. A
message indicating the presently set number of reading con-
versions to average (the “stack” size) is displayed:
AVG:010 RDGS (1-100)
1. To retain the displayed number, press ENTER or EXIT.
2. To set a different number, use the cursor keys ( and
) to select the digits, and the RANGE
▲
and
▼
keys
to increment and decrement the digits. Press ENTER
when done.
Note that the number of reading conversions selected for
the averaging filter type is coupled to that for the ad-
vanced filter type.
ADVANCED
This selection is for an averaging filter with a noise window.
(It is not available with dB or dBm units, ratio or delta, tem-
perature or frequency.) A message indicating the presently
set number of reading conversions to average (the “stack”
size) is displayed:
ADV:010 RDGS (1-100)
1. To retain the displayed number, press ENTER. To set a
different number, use the cursor keys ( and ) to se-
lect the digits, and the RANGE
▲
and
▼
keys to incre-
ment and decrement the digits. Press ENTER when
done.
Note that the number of reading conversions selected for
the advanced filter is coupled to that for the averaging
filter.
2. The next message is for the maximum noise window,
which is expressed in percent of range, as follows:
LEVEL = 00.000000%RNG
This is the plus or minus percentage of range window
around the first reading conversion in the stack. To set a
different percentage, use the cursor keys and RANGE
keys. Press ENTER when done.
AVERAGING-MODE
This selection determines the mode of a digital filter for a
measurement function, either a moving or repeating average.
The AVERAGING MODE menu is shown as follows; its
present selection is highlighted:
AVERAGING MODE
MOVING REPEAT
MOVING:
This item selects a moving filter, where a new
reading conversion is shifted into a stack as the oldest con-
version is shifted out (FIFO). When the stack is full, a simple
average is taken to yield a reading.
REPEAT:
This menu item selects a repeating filter, where an
average of a selected number of reading conversions is taken
for each reading.
3.9.6 Enabling/disabling the filter
The FILTER key toggles the filter on and off for the present
measurement function. With the FILT annunciator on, the fil-
tering action depends on the selections chosen in the FILTER
menu for the present function. With the FILT annunciator
off, the digital filter for that function is completely disabled.
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