![background image](http://html1.mh-extra.com/html/tams/1800-series/1800-series_installation-and-operation-manual_3458175013.webp)
For more information, see TAMS Application Note “AN 1801: Switching in the real
world.”
Connecting switches to instruments
There are two ways to connect the switches to your instruments. The first is via the
Analog Bus on the rear of the switches. A cable is provided which will allow
application-specific connection from the Analog Bus to instruments. Note that for
signals above 42V, a second level of insulation must be provided. Typically, the
switches will be mounted inside of a chassis or rack, which could provide the necessary
screw access for the second level.
The second method of connecting switches to instruments is via the front panel
connectors. D-subminiature cables and connectors are so common that there are a variety
of ways to make these connections, including building them up from crimped pins or
adapting molded cables.
Trigger in/trigger out connections are made via the Analog bus. The Trigger Out is
pulled up to 5V nominal by a 3.3K Ohm resistor. When a TAMS 18xx sends a Trigger
Out, the line is driven low for 2-4uS. The Trigger In is falling edge active. Typical
connections are:
TAMS
18xx
Digital
Voltmeter
Trigger
Out
Trigger
In
Trigger
In
Voltmeter
Complete/Trigger
Out
For more information, see TAMS Application Note “AN 1801: Switching in the real
world.”
Grounding and Signal Integrity
The TAMS 1800 Series signal switches were designed for high signal integrity. The
“Analog Common” or “A-Common” terminals are intended to connect with the ground of
the Product Under Test. Starting with the front connections, there is an Analog Common
pin for each signal pin, allowing twisted pair cabling out to your Product Under Test.
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