4-6
Cabling and Wiring
Use the two 8-position DIP switches on the STC-TC/B or STA-TC/B to
connect/disconnect the open-thermocouple-detection signals on a
channel-by-channel basis. Connect an open-thermocouple detection
signal to a channel by sliding the DIP switch for that channel to ON.
Board labeling for the switches is CH0 (for Channel 0) and CH15 (for
Channel 15).
Note:
On channels connected to high source impedances (for signals
other than thermocouple signals), you may want to disconnect the
open-thermocouple detection signals to get more accurate readings.
Ground Terminals
Two types of ground terminals are included on the STC-TC/B and
STA-TC/B accessories, B GND and CHASSIS GND.
●
Use the B GND terminals to externally connect the grounds of
grounded signal sources to the analog ground of the DAS-TC/B input
amplifier. The B GND terminals lead to the analog ground. Refer to
“Connecting Signals” on page 4-7 for more information about the
analog ground.
●
Use the CHASSIS GND terminals to connect signal-wire shields. The
CHASSIS GND terminals connect to the mounting screws of the
37-pin connector, and to a protective ground plane on the bottom of
the accessory. Therefore, when an STC-TC/B is mounted on an
installed DAS-TC/B, the CHASSIS GND terminals are directly
connected to the chassis ground of the host computer. Likewise, when
an STA-TC/B is attached to a DAS-TC/B via an S-1800 shielded
cable, the CHASSIS GND terminals are connected to the chassis
ground of the host computer via the shield of the cable.
Note:
You must use an S-1800 cable to connect the CHASSIS GND
terminals of an STA-TC/B to the chassis ground of the host computer. If
you use a C-1800 cable, the CHASSIS GND terminals will be
ungrounded.
