The start “bit-select” can be set with numbers in Hex, representing 32 input
channels, if set bit-select to 0, shows this channel can be ignored, without match
checking, and has no influence on start whatever signal level of this channel is 0
or 1. If set bit-select to 1, shows the channel is effective, and must be made
matching checking. The default setting of start bit-select is 0000FFFF, means that
only check 00~07 channels, ignore 08~31 channels.
The start “compare word” can be set with numbers in Hex, the default setting of
start compare word is 00000069 and means once Hex number 69 appears in
00~07 channels in the input data streams, in other words when the logic level of
00~07 channels is “01101001”
，
the trigger conditions is satisfied.
Different from start conditions, the trigger conditions sets three trigger limit
switches, <, =, >, which are useful for testing the data fluctuant limit to the tested
signals. The trigger limit switch can be set with number keys, press
【
1
】
to
connect the switch, but only one is connected in the three trigger limit switch,
once one switch is connected, the other two switches are disconnected. The
default setting of the trigger limit switch is "=" connecting.
5.8.5. Event count
When the sampling process starts, the instrument starts to sample the input
signals, and stores the sampling data in the memory, at the same time, compares
the sampling data with the trigger conditions and the trigger limit switch, if the
sampling data satisfy the trigger conditions and the trigger limit switch, means
that it captures a trigger event. In some applications, the trigger event we care
may appear many times, and the thing we interested in is the situations after the
trigger event appears many times. If we can capture the trigger event for many
times in one sampling process, that may be more convenient for analysis. So the
instrument sets a trigger event counter, after the sampling process starts, the
count value firstly resets, then the count value adds one when meets the trigger
event once, till the count value reaches the setting value of the trigger event , the
trigger process finishes.
The trigger events count can be set with numbers in Dec, the setting range is
1~999, the default setting of the trigger event count value is 001.
5.8.6. Trigger select
The trigger select switch can be set with numbers, the key
【
0
】
cuts the switch
，
the key
【
1
】
connects the switch.If the trigger select switch is connected, the
trigger conditions, the trigger limit switch and the event counter are all short-
circuit, having no use.In other words, after sampling process starts, the
instrument does not detect the trigger conditions, also does not count the event ,
the trigger process finishes unconditionally.
The default setting of the “start select switch” is “connect” in order to make
random sampling drilling justly, and has no specific sampling purpose on
capturing what kind of signal, not need to set the trigger conditions and event
count too. If the setting of the start select switch is “cut”, then only understand
the tested signal clearly and have specific sampling purpose, can set the suitable
trigger conditions, trigger limit switch and event count. Otherwise, if sets these
parameters unsuitably, the trigger process may not finish.
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