SPECIFICATIONS
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113
Chapter 9
Blank Activate
Causes SCALED OUTPUT and I OUTPUT to hold their initial value for the duration of
the blanking pulse. Does not affect 10V
m
output.
Speed Test
Injects current into headstage input through a 1 pF capacitor. Injected current waveform is
the derivative of the voltage waveform applied at SPEED TEST input. For example, a
100 Hz 10 V
p-p
triangle wave will inject a 1 nA
p-p
square wave into the headstage input.
Signal Outputs
Scaled Output
Scaled and filtered by output control settings. Sample and hold pedestal compensation.
Output is I (αβ mV/pA) when in V-CLAMP or TRACK (I=0) mode. Output is V
m
(α mV/mV) when in I-CLAMP mode. BNCs on front and rear panels are identical.
I
Pipette current. Rear switched gain of either βmV/pA or 100 βmV/pA; fixed filter: 10 kHz
3-pole Bessel. Output does not benefit from sample and hold pedestal compensation.
10V
m
Membrane potential at x10 gain. Junction potentials removed.
Output Controls
Output Gain(
α
αα
α
)
10 values from 0.5 - 500. Affects SCALED OUTPUT only. Selected value sets analog
voltage on GAIN TELEGRAPH OUTPUT for reading by computer.
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