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Measurement Computing IOtech 640 Series User Manual

Page 99

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640 & 650 Series

907493

Glossary G-3

Trigger

For IOtech 640 and 650 Series devices, “trigger” refers to a software event that starts a scan or

marks an instant during an acquisition.

TTL

Transistor-Transistor Logic (TTL) is a circuit in which a multiple-emitter transistor has replaced

the multiple diode cluster (of the diode-transistor logic circuit); typically used to communicate
logic signals at 5 V.

Unipolar

A range of analog signals that is always zero or positive (e.g., 0 to 10 V). Evaluating a signal in

the right range (unipolar or bipolar) allows greater resolution by using the full-range of the
corresponding digital value. See bipolar.