Dual Channel Biphasic Switcher Module

Dual Channel Biphasic Switcher Module

Dual Channel Biphasic Switcher Module

Item# Description U.S. List Price Quantity
65-0356 Dual Channel Biphasic Switcher, for use with the Dual Stimulator Modules (65-0349 and 65-0357)
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This 2-Channel Bi-Phasic switcher is for use with a D333H or D343 module. The unit provides the switching function required to alternate the polarity of the stimuli to each of two preparations. It provides control of stimulus polarity (Normal, Alternating or Reverse) independently for each channel as well as warning of a stimulus timing rate that is too-fast. The control and timing for the pulses is generated by selecting other modules from the D330 - MultiStim™ range. It should be noted that the unit works with mechanical relays that require a certain time to switch their polarity. The circuitry is designed so that the changeover command is taken (independently for each channel) from the end of each stimulus timing pulse so that the relay ‘moves’ when no stimulus is being applied. As with all mechanical devices, relays have a finite life. This is quoted as a minimum of 100,000,000 mechanical operations. If the relay was to ‘move’ whilst a stimulus was presented the contacts would wear-out much quicker than the mechanics. Therefore, the circuit will detect and warn the user if the ‘time-between’ stimuli pulses is less than 5 ms. The user must ensure that this never happens. The module connects to the outputs of a D333H or D343 via 2 mm - 2 mm leads (supplied). The D333H/343 has the functions and specifications as defined in its specification part of this manual. Each module is preset for specific channels whose outputs are to be switched. Normally, the unit will be supplied preset for channels 1 and 2 or as required when a full system is purchased. That is, the timing signals of the D333H/343 and the D342 will automatically be the same. The channels set is shown at the top of the module front panel.
Specifications65-0356
AmplitudeAs set on associated D333H/D343 channel, optional D335 METER module will display current and voltage
Current1 A max. (depends on D333H/D343)
Electrical Life5,000,000 operations at 200 mA, 200,000 operations at 1 A Note: only applies if stimulus rate is NOT too high (< 5 ms ISI)
Indicators: ReverseAmber LED indicates output pulse is ‘REVERSE’
Indicators: Too-FastRed LED illuminates if ‘off’ time between stimuli is < 5 msec
Mechanical Life100,000,000 (100 Million) operations at 10 Hz
ModelD342
OutputPair of 2 mm sockets (with compliance)
Polarity Selector: AltPolarity of sockets with respect to each other reverse with each stimuli
Polarity Selector: NormalLeft hand blue socket will go positive with respect to associated right hand blue socket
Polarity Selector: ReverseRight hand blue socket will go positive with respect to associated left hand blue socket