Global Specialties 3600 - Manual (Page 26)

Users Manual Model 3600
www.globalspecialties.com Page 21
Press 【trigger】to display the graphical trigger setting interface. This
will allow the user to view the entire sampling process directly, as well
as the master trigger setting.
Signal Input
The signal input process is on the left of the trigger setting display.
The externally tested signal from the probe passes through test hooks,
“commuting case”, transmitting cable, connector, to “comparator”,
then compared with the “threshold voltage” to generate digital
signals. The Internal code generator pattern generates an emulating
digital signal. Choose one of these two signals through switch “source
select” by pressing
【source】to select the switch state in cycle. The
selected input signal passes through the channel switch to the sampling
circuit. The setting of the channel switch has been described in section
called Channel Switch Setting.
Start Conditions
The sampling trigger process is on the right of the trigger setting
display. Press the
【Single】key , the sampling process does not initially
start but first checks the start conditions. When it is determined
the data in the input signals is a match, the sampling process starts
immediately.
The start “bit-select” can be set with numbers in Hex, representing 32
input channels. If the bit-select is set to 0, this indicates this channel
is to be ignored. It is not involved in the start match checking and has
no influence on start time regardless of signal level of this channel.
If bit-select is set to 1, this indicates the channel is effective and is to
be included in the start match checking. The default setting of start
bit-select is 0000FFFF which means it only detected 00~15 channels,
ignoring the 16~32 channels. The default setting is only an example.
The user can modify for their measurement needs.
The start “compare word” can be set with numbers in Hex and its
default setting 00001234. This means when “1234” appears in 00~15
channels in the input data streams (logic level of 00~15 channels is
“0001001000110100”) the sampling process starts.
Start Select
The “start select” can be set with numbers. The key 【0】opens the
Model 3600 User Manual_B.indd 21 7/2/2010 4:41:46 PM