NI SCC-CTR01 User Guide and Specifications
10
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Connecting the NI SCC-CTR01 as Referenced to the
Supply
Connect the V
dd
on the external device to the NI SCC-CTR01 SRC or
GATE + pin, and connect the output of the external device to the SRC or
GATE – pin, as shown in Figure 3.
Figure 3.
Referenced to Supply
Note
Connecting the NI SCC-CTR01 as referenced to the supply reverses the digital
logic. To operate the NI SCC-CTR01 with TTL devices, reference the NI SCC-CTR01 to
the supply, as shown in Figure 3.
Note
When placing a relatively slow rise time signal—such as a 5 V peak sine or triangle
wave—on one of the inputs, and a fast rise time, high voltage signal—such as a 400 kHz,
48 V square wave—on the other input, crosstalk between input lines can cause false
triggering. You should separate the input wires as much as possible. If you are using an
M Series DAQ device, consult the M Series User Manual for information about applying
the appropriate digital filter to prevent incorrect measurements.
NI SCC-CTR01
SRC or
GATE –
SRC or
GATE +
V
ss
or GND
Device
V
dd
