PC-505B Manual, Rev. 201013
Warner Instruments
A Harvard Apparatus Company
TTL – Transistor, Transistor Logic. Voltage ranges used to define an on or off state in binary devices. 0-0.8
V defines a logic 0 state and 2.4-5.0 V defines a logic 1 state.
unitary channel conductance – A measure of the ability of a channel to pass an ion from one side of the
membrane to the other. An intrinsic property of a single channel which depends on the ionic species
under consideration. Determined by measuring the current through an open channel in the presence
of a driving force (transmembrane potential) at different potentials. Measurements made within the
Ohmic range of the channel’s response will graph as a straight line. The slope of this line when plotted
as current (I) vs. potential (V) will yield the conductance (or inverse resistance) of the channel under
these conditions.
V
m
HOLD – The transmembrane potential generated by the amplifier and applied to the headstage. This
driving force appears in addition to any other driving forces which may be present.
V
c
– The user selected potential set in the COMMANDS APPLIED TO REFERENCE block of the amplifier.
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