ADInstruments POWERLAB TEACHING SERIES Owner's Manual page 57

gain. The amount of amplification of a signal.
half-bridge transducer. A bridge transducer only using half of the full-bridge circuit. It consists
of two elements of equal value with an excitation voltage applied across them. The output of
the transducer is taken at the junction of the two elements.
Hertz (Hz). The unit of frequency of vibration or oscillation, defined as the number of cycles
per second. For example, the minimum sampling rate for a human ECG experiment should be
400 Hz (400 samples/s).
high-pass filter (HPF). A filter that passes high-frequency signals, but filters low ones, by
blocking DC voltages and attenuating frequencies below a certain value (the cut-off, or –3 dB,
frequency).
I2C ('eye-squared-sea'). This connection is used by the PowerLab to control front-ends. It
provides power and communication using a 4-wire serial bus (two wires for standard I2C and
two control lines).
IEC. International Electrotechnical Commission.
IEC60601-1. An IEC standard applicable to medical devices. Equipment compliant with this
standard gives a high degree of protection from electrical and other hazards.
LabChart. An ADInstruments software application that emulates a multichannel chart record-
er, with other powerful options. (Macintosh and Windows versions differ slightly.)
Lt. An ADInstruments cloud based application for teaching that integrates an experiment pro-
tocol, real-time data acquisition, analysis and reporting as interactive pages in a web browser.
low-pass filter (LPF). A filter that passes low-frequency signals and DC voltages, but filters
high ones, attenuating frequencies above a certain value (the cut-off, or –3 dB, frequency).
TTL (transistor-transistor logic). A family of integrated circuits (ICs) with bipolar circuit logic,
used in computers and related devices.
TTL is also a standard for interconnecting such ICs, defining the voltages
used to represent logical zeroes and ones (binary 0 and 1).
USB. Universal Serial Bus.
waveform. The shape of a wave; a graph of a wave's amplitude over time.
53 PowerLab Teaching Series - Owner's Guide