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Glossary

08-23-02

G-3

Trigger

An event to start a scan or mark an instant during an acquisition. The event can be defined in

various ways; e.g., a TTL signal, a specified voltage level in a monitored channel, a button

manually or mechanically engaged, a software command, etc. Some applications may use pre-

and post-triggers to gather data around an instant or based on signal counts.

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.

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Measurement-computing DaqTemp Manuale Utente Pagina 47