Specifications • 137
Chapter 7
Test Signals
Voltage Clamp
The available test signals are Seal Test, Pulse and Zap.
Seal Test and Pulse amplitudes are selectable from 0 to ±1 V at the electrode.
Seal Test frequency is selectable from 2 to 1000 Hz.
Pulse duration is selectable from 0.1 to 500 ms.
Zap is fixed at +1V at the electrode but with selectable 0.1 to 50 ms duration.
Current Clamp
The available test signals are Tune, Pulse, Buzz and Clear (+/-).
Tune and Pulse amplitudes are selectable from 0 to ±10 V/R
f
amps at the
electrode.
Tune frequency is selectable from 2 to 1000 Hz.
Pulse duration is selectable from 0.1 to 500 ms.
Buzz amplitude is fixed at ±15 V signal to the headstage capacitor but with
selectable 0.05 to 500 ms duration.
Clear (+/-) amplitude is fixed at ±15 V signal to the headstage capacitor.
DC Holding Commands
Voltage Clamp
±1000 mV range in 30 µV steps
Auto Pipette Offset adjusts DC holding potential to zero Membrane Current.
Current Clamp
±200 nA range in 7 pA steps (50 M range)
±20 nA range in 0.7 pA steps (500 M range)
±2 nA range in 0.07 pA steps (5 G range)
Auto Pipette Offset adjusts DC holding current to zero Membrane Potential.
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