Product Number: A13-65

The A13-65 is a general-purpose stimulator designed to serve a very wide variety of applications. It is suitable for uses ranging from stimulation via cutaneous, implanted and microelectrodes to tissue and large organ baths. It may be used for lesioning any tissue for destruction or histological marking. Precision feedback regulation and highly accurate timing also make it ideal for iontophoresis.

This instrument is capable of monophasic or biphasic (polarity reversal) stimulation with a constant-current (feedback regulated) or constant-voltage (feedback regulated) output. It is totally isolated from line voltage by means of a split-winding transformer. The stimulus synthesis section is additionally isolated from the main unit output and the subject by optical isolation. The oscilloscope monitor output is also totally optically isolated from the subject, giving high accuracy in monitoring without stray signal or ground reference problems.

The stimulus protocol (timing, amplitude, and pulse relationships of the actual electrical stimulus output) may be programmed via the keypad on the front of the instrument, or it may be programmed on a computer and downloaded to the stimulator. Programming is simple: the user is led through the setup of a protocol by a series of prompts on the front panel display. Entry of Yes / No responses or numeric values for time and amplitude is all that's required.

The unit can store up to 255 stimulus protocols, which can be recalled by a keypad entry or by an on-line computer for instantaneous protocol change while running an experiment. The unit may be controlled by Tru Scan software or by WinLinc behavioral software, and any of its stored protocols may be executed with the same ease as any auditory or visual stimulus in the environment.

Product Number: A13-75

The A13-75 is designed to convert DAC outputs to controlled stimuli. It will also isolate and amplify any stimulus signal, square pulse, sine, ramps, etc. from other sources and control for constant current or constant voltage. A fully protected, direct-coupled output prevents damage from overloads or shorts, and the power supply is completely isolated from the stimulus signal inputs. A high-speed reed relay electrode transfer and shunt provides for stimulus presentation, recording, electrode disconnect and electrode shorting to eliminate tissue charge buildup.

No matter what signal source is used, the isolator's stimulus output can be controlled for either constant (feedback regulated)voltage or current. The voltage of the stimulus signal fed into the input will determine either the voltage or the current of the output.

In the voltage mode, the unit puts out a constant voltage at the rate of 1 volt per volt input (unity gain), 10 volts per volt (x10), or 100 volts per volt (x100). If the midrange is selected and the stimulus signal voltage is 0.5 volts, the output will be the same signal form at 5 volts.

The 3 ranges of current setting will produce constant current outputs of 0 to 100 microamps, 0 to 1 milliamp, and 0 to 10 milliamps. The input voltage determines the output current in this mode. If the midrange were selected which produces 100 microamps per volt, and a stimulus complex in the range of 0.5 volts were introduced to the input, the output would be the same stimulus configuration ("waveform") controlled for a constant current in the range of 50 microamps.

Stimulus configuration sources may be synthesized analog signals from signal generators, oscillators, or even non-isolated stimulators; or they can even be recorded signals from analog tape.

Product Number: E13-22

The E13-22 is a basic, two-pole, resistively regulated, battery powered aversive electric stimulator, designed for finger stimulation. The unit features series resistance-regulation.
Series resistance-regulated stimulators can never deliver more current than the total circuit resistance predicates. The set accuracy is controlled by use of a fixed series resistor. The regulation is +/- 10% over a 10K to 30K subject resistance change and is designed for long session use. Being battery operated, it is fully isolated for subject and operator safety. The remote operate control input is optically isolated to simplify operation from any signal source from 5 to 30 VDC and to preserve total isolation. The output stimulus configuration consists of a series of low current pulses the frequency of which is set to 50 pulses per second.