刺激隔離器

There are five PULSE TRAIN channels in the Pulsemaster. Except for sharing a common power supply, each is an independent instrument. Each channel has two adjustable timing parameters, DELAY and WIDTH, which in combination with internal or external signals may be used to create a variety of pulse and train waveforms. DELAY and WIDTH parameters can be changed while the instrument is operating. The basic difference between PULSE and TRAIN modes is the number of pulses that can be generated per sync pulse. In PULSE mode, only one pulse is generated for each sync pulse. As the sync pulse is received from one of the selected input sources, the leading rising edge of the pulse is recognized and a DELAY time/pulse WIDTH pair is generated. In TRAIN mode, multiple pulses can be generated per sync pulse. As in PULSE mode, as the leading rising edge of the sync pulse is recognized, a pulse WIDTH/DELAY pair is generated. Pulses (WIDTH/DELAY pairs) are continuously produced as long as the sync pulse is still “high” at the conclusion of the DELAY time. By means of the INPUT SELECT switch, sync pulses can be received from an external source through the EXT SYNC connector, manually by the SINGLE switch, from any of the other PULSE TRAIN channels, or one of the MIXER channels. The channel may also be disabled by switching to one of the OFF positions. EXT SYNC position: permits control of the PULSE TRAIN channel by other instruments and computers. SELF SYNC position: the channel becomes a free running pulse generator. The symmetry of the waveform can be adjusted by varying the DELAY and/or the WIDTH times. SINGLE EVENT position: pulses are generated at your discretion. Every time the SINGLE button is pressed, one and only one DELAY/WIDTH sequence is generated. EI position: connects the output of the EVENT INTERVAL generator to the input of the PULSE TRAIN channel. For every output sync pulse from the EVENT INTERVAL generator, one DELAY/WIDTH pair is generated. PT positions (4): internally connect the outputs from the respective PULSE TRAIN channels to the input of this PULSE TRAIN channel. In the PULSE mode, for every OUTPUT pulse from the other selected PULSE TRAIN channel, one DELAY/WIDTH pair is generated from this channel. In the TRAIN mode, pulses are generated from this channel as long as the pulse from the other channel remains “high.” MIX positions (2): internally connect the outputs from the respective MIXER channels to the input of this PULSE TRAIN channel. In the PULSE mode, for every OUTPUT pulse from the MIXER channel, one DELAY/WIDTH pair is generated from this channel. In TRAIN mode, pulses are generated from this channel as long as the pulse from the MIXER channel remains “high.” OUTPUT connector: supplies the waveforms generated by the PULSE TRAIN channel. This OUTPUT is designed to drive WPI’s A300 series stimulus isolators. It is also useful for synchronizing other instruments (recorders, oscilloscopes, computers, etc.) with the pulses generated from the Pulsemaster.