7-34
System 3
MS4/MS16 Stimulus Isolator
The final analog current output from the isolator is adjusted to match the stimulation
control waveform by adjusting the isolator’s driving voltage according to Ohm’s law
where: V=IR. That is, the driving voltage is adjusted for the stimulation control
waveform level and the electrode impedance. In this way, the stimulation current
specified by the user will be constant regardless of electrode impedance, within
system limits.
The MicroStimulator System standard configuration is capable of delivering up to 100
μ
A of current simultaneously across up to 16 stimulating electrodes (impedance up to
1 Mohm). See “Working with the MS16 MilliAmp Mode ” on page 7-48, for
information if your stimulus isolator has been configured for MilliAmp mode.
The
Stimulus
Isolator
The stimulus isolator features either four or 16 D/A converters that can deliver
arbitrary waveforms of up to 10 kHz bandwidth. PCM D/As are used to ensure
sample delays of only 4-5 samples and square edges on pulse stimulation
waveforms.
Each of the device’s stimulation channels can be configured in one of three states:
Stimulate:
Channels in stimulate mode pass current through the selected electrodes.
Reference:
Channels in reference mode become part of the return path for the
current. All channels in Reference mode use the same return path to analog ground
on the stimulator.
Note:
Users can also use a dedicated global reference channel as
a current return path. In this mode all channels can be used for stimulation.
Open:
The Open mode is the default mode for all channels. In the open mode,
the corresponding electrode channel is disconnected from output and internally
grounded to eliminate noise and crosstalk. On multichannel electrodes, these
electrodes might instead be connected to a recording preamp. In this mode a
channel can be used to acquire neural signals.
The stimulus isolator utilizes an onboard, rechargeable Li-Ion battery for logic control
and D/A converter operation. Special circuitry on the stimulus isolator draws on
external high voltage battery packs to convert low voltage waveforms from the D/A
converters to analog current waveforms as shown in the diagram below.
Stimulus
Isolator
Diagram
The
ACC16
AC
Coupler
The stimulus isolator may generate a DC bias current of up to 0.2% of full scale
(up to 0.2
μ
A on 100
μ
A device) on any stimulation channel, even during a
quiescent state. While this may not have significant short-term effects, over time, it
may cause unintended tissue damage. This problem primarily affects researchers using
electrodes with impedance of more than 100 kOhms. Users may connect the ACC16
Summary of Contents for RZ2
Page 1: ...System 3 Manual Updated 5 8 18...
Page 7: ...Part 1 RZ Z Series Processors...
Page 8: ...1 2 System 3...
Page 40: ...1 34 System 3 RZ5P Fiber Photometry Processor...
Page 56: ...1 50 System 3 RZ6 Multi I O Processor...
Page 68: ...1 62 System 3 RZ5 BioAmp Processor...
Page 96: ...1 90 System 3 RZ UDP Communications Interface...
Page 97: ...Part 2 Data Streamers...
Page 98: ...1 2 System 3...
Page 122: ...2 26 System 3 RS4 Data Streamer...
Page 133: ...Part 3 RX Processors...
Page 134: ...3 2 System 3...
Page 156: ...3 24 System 3 RX6 Multifunction Processor...
Page 177: ...Part 4 RP Processors...
Page 178: ...4 2 System 3...
Page 184: ...4 8 System 3 RP2 1 Real Time Processor...
Page 199: ...Part 5 RM Mobile Processors...
Page 200: ...5 2 System 3...
Page 209: ...Part 6 Preamplifiers...
Page 210: ...1 2 System 3...
Page 238: ...6 30 System 3 PZ5 NeuroDigitizer...
Page 266: ...6 58 System 3 PZ5M Medically Isolated NeuroDigitizer...
Page 274: ...6 66 System 3 PZ2 PreAmp...
Page 296: ...6 88 System 3 RA16PA RA4PA Medusa PreAmps...
Page 315: ...Part 7 Stimulus Isolator...
Page 316: ...1 2 System 3...
Page 334: ...7 20 System 3 IZ2 IZ2H Stimulator...
Page 346: ...7 32 System 3 IZ2M IZ2MH Stimulator...
Page 368: ...7 54 System 3 MS4 MS16 Stimulus Isolator...
Page 369: ...Part 8 Video Processor...
Page 370: ...1 2 System 3...
Page 388: ...8 20 System 3 RV2 Video Processor...
Page 406: ...8 38 System 3 RVMap Software for RV2...
Page 407: ...Part 9 MicroElectrode Array Interface...
Page 408: ...1 2 System 3...
Page 415: ...Part 10 High Impedance Headstages...
Page 416: ...1 2 System 3...
Page 442: ...10 28 System 3 ZIF Clip ZCD Digital Headstages...
Page 474: ...10 60 System 3 SH16 Switchable Headstages...
Page 475: ...Part 11 Low Impedance Headstages...
Page 476: ...1 2 System 3...
Page 483: ...Part 12 Adapters and Connectors...
Page 484: ...1 2 System 3...
Page 512: ...12 30 System 3 Splitters...
Page 519: ...Part 13 Microwire Arrays...
Page 520: ...1 2 System 3...
Page 526: ...13 8 System 3 ZIF Clip Based Microwire Arrays...
Page 531: ...System 3 13 13 Suggestions for Microwire Insertion...
Page 532: ...13 14 System 3 Suggestions for Microwire Insertion...
Page 545: ...Part 14 Attenuator...
Page 546: ...1 2 System 3...
Page 558: ...14 14 System 3 PA5 Programmable Attenuator...
Page 559: ...Part 15 Commutators...
Page 560: ...1 2 System 3...
Page 578: ...15 20 System 3 ACO32 ACO64 Motorized Commutators...
Page 579: ...Part 16 Transducers and Amplifiers...
Page 580: ...1 2 System 3...
Page 586: ...16 8 System 3 MF1 Multi Field Magnetic Speakers...
Page 592: ...16 14 System 3 EC1 ES1 Electrostatic Speaker...
Page 597: ...System 3 16 19 HB7 Headphone Buffer...
Page 598: ...16 20 System 3 HB7 Headphone Buffer...
Page 601: ...System 3 16 23 MA3 Microphone Amplifier Frequency Response Diagram...
Page 602: ...16 24 System 3 MA3 Microphone Amplifier...
Page 604: ...16 26 System 3 MS2 Monitor Speaker...
Page 610: ...16 32 System 3 SA8 Eight Channel Power Amplifier...
Page 614: ...16 36 System 3 FLYSYS FlashLamp System...
Page 619: ...Part 17 Subject Interface...
Page 620: ...1 2 System 3...
Page 659: ...Part 18 Signal Handling...
Page 660: ...1 2 System 3...
Page 691: ...Part 19 PC Interfaces...
Page 692: ...19 2 System 3...
Page 697: ...System 3 19 7 PO5 PO5e Optibit Interface Dimensions PO5e PO5...
Page 700: ...19 10 System 3 UZ3 USB 3 0 Interface for Optibit...
Page 704: ...19 14 System 3 LO5 ExpressCard to zBus Interface...
Page 707: ...Part 20 The zBus and Power Supply...
Page 708: ...20 2 System 3...
Page 714: ...20 8 System 3 ZB1 Device Caddie and PS25F Power Supply...
Page 715: ...Part 21 System 3 Utilities...
Page 716: ...21 2 System 3...
Page 728: ...21 14 System 3 Corpus System 3 Hardware Emulator...
Page 729: ...Part 22 Computer Workstation...
Page 730: ...22 2 System 3...