Series BG
8
CAL - Calibration. See Section 10.
FILTERS
For maximum flexibility in noise suppression and peak capturing ability of the instru-
ment, there are two types of filters available to the user: analog and digital.
The analog filter is a simple RC network with a cutoff frequency of 2.5 Hz and attenu-
ation of 20 dB/decade. It can be either turned on or off.
The digital filter utilizes the moving average technique in which consecutive readings
are "pushed" through a buffer and the displayed reading is the average of the buffer
contents. By varying the length of the buffer, a variable smoothing effect can be
achieved. The BG is equipped with a buffer which can hold up to eight readings. The
number of readings to be averaged can be set to 1,2,4 or 8. The selection of 1 will
disable the filter since the average of a single value is the value itself.
The analog and the digital filters should be disabled or set to their minimum
acceptable values for highest peak capture speed.
EXTERNAL TRIGGER MODE
This mode of operation is useful for measuring electrical contact activation force as
well as synchronization of multiple instruments for a "snap-shot" view of applied
forces. When this mode is enabled through
the configuration menu (see Section 3),
the MODE key will sequence through an
additional state which is indicated by the
flashing "C" or "T" indicator.
When in this mode, the instrument stops
updating the display when the trigger sig-
nal is applied. It is possible to capture the
reading with a normally open contact (high
to low transition of the trigger signal) or a
normally closed contact (low to high tran-
sition).
The display will show the captured reading until ZERO or CLEAR is pressed if the
"edge" mode is set. The "level" mode provides for the display to hold the reading only
until the trigger signal returns to its original state.
Please refer to the diagram for connection details and to Section 3 for configuration
information.
USER - SUPPLIED
SWITCH UNDER TEST
47K
+5V
GND
TRIG
3
5
GAUGE
Section 4
Section 5
