Stimulator HC

Overview:

The FE155 Stimulator HC is a software-controlled, constant-current stimulator with 100 V compliance designed for use in vitro with isolated nerve, muscle or tissue samples.  The unit uses the analog output from the PowerLab to produce isolation and software adjustable constant-current pulses of 10 microsecond to 4 milliseconds duration, of 0.1 to 30 Hz pulse frequency and up to 100 mA pulse amplitude. It is supplied with MLAC36 Stimulator HC Leads (2m).
 

Features:

• A high-voltage constant-current output source that produces pulses of variable duration and amplitude under software control.
• Current source that can deliver pulses up to 100 mA at 100 V compliance levels; its amplitude is set by a digital attenuator network, which is in turn controlled by the I²C logic.
• Isolated optical couplers.
• A safety approved power pack external AC wall-plug transformer provides power for the Stimulator HC current source (from which the isolated low voltage and 100 V supplies are derived).
• An indicator light on the front panel which lights green with every pulse (it will glow yellow if the Stimulator HC is out of compliance).
• A small internal beeper can also be enabled to give an audible beep with every pulse delivered.
• Supplied with the MLAC36 Stimulator HC Cable (2 m).

Applications:

Nerve and muscle stimulation for in vitro evoked response measurement. This unit is ideal for use in student experiments involving electrical stimulation.

Specifications:

Output

• Connection type: Two 2 mm touch proof safety plugs
• Output configuration: Constant-current stimulator with hardware limited repetition rate
• Output waveform: Rectangular, monophasic pulses with software selectable pulse amplitude and duration
• Isolation rating: 4000 V AC_rms for 1 minute
• Safety indicators: A single multi-color indicator displays the Stimulator HC status. A green flash indicates delivery of a valid stimulus. A yellow flash indicates an out-of-compliance condition (OOC).
• Safety switch: Isolating On-Off switch flicks down to disconnect quickly
• Compliance voltage: 100 V fixed
• Current ranges: 1 mA, 10 mA, 100 mA full scale
• Current rise time: <1 μs (100 Ohm load @ 100 mA) 25 μs (10 kOhm load@ 0.5 mA)
• Current fall time: <1 μs (100 Ohm load @ 100 mA) 25 μs (10 kOhm load @ 0.5 mA)
• Note: Rise and fall times are proportional to load resistance and capacitance.
• Operating duty cycle: up to 20%
• Resolution: 1% of full scale (10 μA, 100 μA, or 1 mA)
• AC line leakage current: <200 nA p–p
• Differential output noise: <1 μA p–p
• Output capacitance: ~70 pF (without cable)
• Power source: Non-isolated circuitry supplied by PowerLab via I²C connection. Isolated and high-voltage circuitry derives power from the external 12 V AC, 300 mA_rms, wall-plug transformer. High voltage isolation is provided by an internal isolation transformer. No batteries required.

Pulse Control (internal pulse duration control)

• Pulse duration range: 0.02 to 5.12 ms in 0.02 ms steps
• Duration accuracy: ±0.01% +5/-0 μs
• Repetition rate: up to 30 Hz
• Repetition accuracy: ±0.1% (determined by PowerLab)
• Current rise delay: 22–45 μs (variable)

Control Port

• I²C port: Provides control and power
• Interface communications rate of ~50 kbits/s

Physical Configuration

• Dimensions (h × w × d): 50 mm × 76 mm × 260 mm (1.96” × 3.0” × 10.2”)
• Weight: 840 g (1 lb 13 oz)
• Operating temperature range: 0–35 °C, 0–90% humidity (non-condensing)

ADInstruments reserves the right to alter these specifications at any time.