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5-28

Chapter 5

Explanation of Controls

S1 & S2 p

ulSeS

The

S1 PULSES

and S2 PULSES buttons allow

selection of three types of stimulus waveforms;

MONOPHASIC (MO), BIPHASIC (BI), and TWIN (TW) PULSES.

Monophasic pulses

are single phase positive

pulses starting at zero volts and rising to a preset
voltage, then returning to zero.

Biphasic pulses

provide a positive phase followed

by a negative phase of identical duration and
voltage.

Twin pulses

offer two identical pulses separated

by the S1 or S2 delay settings.

ingle

ulSeS

The

S1 SINGLE

and

S2 SINGLE

buttons deliver single stimulus pulses when

these functions are selected using the

and

S2 FUNCTION

touch-pad

controls.

utput

The

OUTPUT ON/OFF

buttons control the output stimulus. There is no

stimulus output unless the

OUTPUT ON/OFF

. The output is on if the LED

next to the touch-pad control is lit. All related synchronous output pulses
are active.

timulus

imiNg

oNtrols

The cluster of

TIMING

controls include S1/S2 stimulus,

RATE, DELAY, DURATION

right and left arrow buttons, and a thumbwheel dial. These controls allow
precise timing parameter settings for S1 and S2 as indicated
on the display.

Figure 5-1a:
Monophasic Waveform

Figure 5-1b:
True Biphasic Waveform

Figure 5-1c:
TWin Waveform

Содержание Grass S88X

Страница 1: ...1 773 2600 Fax 401 732 7097 Technical Support 877 472 7779 E mail grass natus com Web site www natus com Manual Part Number M643H05 Release D S88X Dual Output Square Pulse Stimulator Grass USER SERVIC...

Страница 2: ......

Страница 3: ...8 Bristol Circle Oakville ON L6H 5S1 Canada phone 1 401 773 2600 fax 1 401 732 7097 toll free 1 877 472 7779 USA only 1 855 554 3184 Canada only email grass natus com www natus com EUROPEAN AUTHORIZED...

Страница 4: ...or the rights of others Excel Tech Ltd does not assume any liability arising out of any infringements of patents or other rights of third parties All rights reserved This document contains confidentia...

Страница 5: ...out the prior written approval of Grass The user of this product shall have the sole responsibility for any malfunction that results from improper use faulty maintenance improper repair unauthorized s...

Страница 6: ...imulation are not completely understood Parameters that affect safe stimulation levels are Pulse Repetition Rate Pulse Duration Pulse Duty Cycle Voltage and or Current Intensity Biphasic vs Monophasic...

Страница 7: ...Safety Information 2 13 CAUTION 2 13 WARNING 2 13 Electromagnetic Compatibility Information 2 14 3 General Considerations 3 15 Applications Capabilities 3 15 Accuracy Waveform 3 18 Line Voltage Requi...

Страница 8: ...Amplitude 5 29 Sync Out Synchronous Outputs 5 29 Sync In Synchronous Inputs 5 30 Monitors 5 31 S1 S2 LED Monitors 5 31 Output On Off LED Monitors 5 31 Output Monitor 5 31 USB Interface 5 31 Duty Cycle...

Страница 9: ...ngle Arrhythmic SA 7 46 Sync to S2 Delay 7 47 Twin Pulse Mode 7 47 Biphasic Pulse Mode 7 47 Monophasic Pulse Mode 7 48 8 Artifact Stimulus Isolation Constant Current 8 49 Stimulus Artifact 8 49 Source...

Страница 10: ...x Table of Contents...

Страница 11: ...ak Synchronous Inputs TTL Train Duration S1 Delay S2 Delay Front panel BNC connectors 4 75 kohm pullup to 5 volts Stimulus Output 250 mV to 24 volts monophasic 250 mV to 12 VDC biphasic Peak Output Cu...

Страница 12: ...1 12 Chapter 1 Specifications Glossary of Symbols Warnings Cautions...

Страница 13: ...tages and other hazards Observe labels and caution notices 3 Never drop or push objects into the stimulator through cabinet slots as it is possible to come in contact with hazardous voltages or cause...

Страница 14: ...output is ground Also all sync inputs and outputs are also referenced to ground To obtain stimulus potentials isolated from ground choose the appropriate Grass isolation unit 10 If this stimulator is...

Страница 15: ...ment The built in versatility of the S88X Stimulator makes it suitable for unlimited stimulation protocols The S88X has four parameter control of the two independent outputs In addition to single repe...

Страница 16: ...e is especially suited to applications where relatively long term stimulation of implanted electrodes is anticipated and minimization of ion transfer from metal electrodes to tissue is desired All mod...

Страница 17: ...eral stimulus isolation units are available for use with the S88X Model SIU V Isolated constant voltage Model SIU C Isolated constant current Model SIU BI Isolated biphasic constant current Model PSIU...

Страница 18: ...en complex pulse patterns are produced and until all basic modes of operation of the S88X are understood clearly monitoring the output with an oscilloscope is advised Figure 3 4 shows typical pulse wa...

Страница 19: ...le is calculated as twice the pulse time divided by the period multiplied by 100 The S88X duty cycle limit can be set in the SETUP function The default value is set to 50 Values from 0 to 99 are selec...

Страница 20: ...ibration may be affected if operated above a 50 duty cycle The train duration should not exceed 50 of the TRAIN RATE settings Mounting Installation The S88X is housed in a compact cabinet 9 W x 5 25 H...

Страница 21: ...C terminals Gray Most switches are membrane touch pad type offering extreme reliability Settings are displayed on the front panel bright vacuum florescent display Power Supply The S88X power supply pr...

Страница 22: ...circuits to the output of the S88X The output circuit also contains a low power section that takes as an input the amplified signals and puts out a composite signal used to monitor the output S1 S2 O...

Страница 23: ...esent the normal output from the stimulator The high output current available is capable of stimulating multiple baths The amount of current required by a bath depends on several factors Bath size typ...

Страница 24: ...4 24 Chapter 4 Description of Circuits...

Страница 25: ...AC power supplied via the AC cable assembly This switch turns the S88X on or off Setup Enter Accept The SETUP touch pad control sets several modes as seen on the display These are DUTY CYCLE LIMIT CHO...

Страница 26: ...select the digit to be changed The selected digit will flash Use the thumbwheel control to increase or decrease that number S1 S2 Timing Parameter Ranges Train Rate The Train Rate is adjustable from...

Страница 27: ...requiring an external trigger to the S1 DELAY SYNC IN or TRAIN DURATION SYNC IN terminal See Synchronous Inputs Outputs later in this chapter for more information EXT CONTROL FROM S1 DELAY SD EXT CON...

Страница 28: ...NGLE and S2 SINGLE buttons deliver single stimulus pulses when these functions are selected using the S1 and S2 FUNCTION touch pad controls Output On Off The OUTPUT ON OFF buttons control the output s...

Страница 29: ...minal 1 Stimulus Output Terminals 2 3 Ground Terminal 4 27 Volts Power Supply The mating output connector can be ordered from Grass as part number CON 21917 Mating output cables of approximately 8 fee...

Страница 30: ...Activation of the Sync In circuits requires selecting the desired function for the circuit used For example to trigger the S1 Delay Sync In circuit the Function EXT CONTROL FROM S1 DELAY SD must be s...

Страница 31: ...ides a low level waveform output of the S1 and S2 stimuli for monitoring purposes This output is referenced to ground When the CHOOSE STIMULUS ISOLATION UNITS selection in the SETUP is set to NONE the...

Страница 32: ...not be set greater than about T 1 2F which is 50 duty cycle The S88X SETUP function provides for changing the Duty Cycle limits The default value is 50 Values from 0 to 99 can be selected Note The S88...

Страница 33: ...er connected via a USB cable There are several methods for doing this 1 S88X Host Control Software provides a virtual control panel for S88X which provides all of the features and settings accessible...

Страница 34: ...ce allows C and C developers to control the S88X A demo C interface is available as an example 3 A Python module and driver allows users of this popular easy to use scripting language to control S88X...

Страница 35: ...FUNCTIONS The ENTER ACCEPT touch pad control is used to enter and accept changes made in the SETUP Duty Cycle Limit The Duty Cycle Limit default setting is 50 Values from 0 to 99 can be selected To ch...

Страница 36: ...thumbwheel control to select S1 STIMULUS ISOLATION UNITS and press the ENTER ACCEPT touch pad control again 5 Select the SIU to be used SIU V SIU C SIU BI or PSIU6X connected to the S1 OUT using the T...

Страница 37: ...umber that is flashing is the number that is selected Then use the thumbwheel control to increase or decrease that number Saving the S88X Setup 1 Press the SETUP touch pad control 2 Toggle down the li...

Страница 38: ...t of the delay prior to the onset of the train For example suppose it is desired to deliver a single train of pulses from the S1 output with the following parameters Train Delay 1 second Train Duratio...

Страница 39: ...N SYNC LOCATION then ENTER ACCEPT 3 Select START OF TRAIN DURATION or END OF TRAIN DURATION then ENTER ACCEPT Type of Train Parameters This selection changes the train parameters rate and duration fro...

Страница 40: ...econds 8 Use the left and right arrow keys to select the digit to be changed 9 Use the TIMING thumbwheel to select a value between 0 and 9 10 Set the OUTPUT AMPLITUDE in volts using the OUTPUT AMPLITU...

Страница 41: ...o delay or the S1 DEL or S2 DEL if delay is required to the other device synchronous input Single Trains S1 or S2 1 Select S1 or S2 FUNCTION and use the thumbwheel to select S1 or S2 FUNCTION SINGLE T...

Страница 42: ...out Repeating Trains RT S1 or S2 1 Depress the S1 FUNCTION button and use the TIMING thumbwheel to select REPEATING TRAIN function 2 Depress the TRAIN RATE button and select the desired rate using the...

Страница 43: ...g the Sync Inputs Sync to Train Duration This mode is intended for delivering a train of pulses from S1 by an external device The connection from the external device must connect to the TRAIN DUR SYNC...

Страница 44: ...voltages can be the same or different The following procedure lists the settings 1 Select S1 FUNCTION then S1 REPEATING PULSES RP 2 Select S1 PULSES then MONOPHASIC 3 Select TIMING RATE and set to 00...

Страница 45: ...then FUNCTION POST S1 TRAIN PT 8 Select S2 PULSES then MONOPHASIC 9 Select TIMING DELAY then enter 03 0000 seconds 10 Select S2 DURATION and enter 02 00000 seconds 11 Set the S1 and S2 OUTPUT AMPLITUD...

Страница 46: ...ulse and an arrhythmic S2 pulse is set by the S2 Delay The S1 can be single pulses or repetitive pulses The following example lists the settings required to deliver a single 2 millisecond monophasic S...

Страница 47: ...om 0 to 12 volts This mode is used to minimize ion transfer from electrodes to tissue Non Isolated Mode Ground referenced Biphasic pulses are available from both S1 and S2 outputs by selecting the Bip...

Страница 48: ...tup screen for both S1 and S2 Select Monophasic MO for the Pulses selection Select the Sync with S1 SS S2 function and use the S2 Delay to separate the pulses Connect the output terminals of the PSIU6...

Страница 49: ...response in time as indicated in the oscilloscope record of Figure 8 1 The delay between stimulus artifact and the evoked response is dependent upon stimulation parameters and the characteristic prope...

Страница 50: ...low if possible To alleviate stimulus artifact Isolate the stimulus pulse from ground and thereby reduce the circulating ground currents between the stimulator preparation and recording instrument Spa...

Страница 51: ...e in solutions will drive a long lead line or other capacitive loads without degrading the stimulus pulse This is not possible with a high impedance source constant current It is possible and economic...

Страница 52: ...current When moderate frequencies and durations are used the meter will indicate average current Peak current of a simple repetitive pulse can be calculated by the following Peak Current ____________...

Страница 53: ...orrespond to the sensitivity of the oscilloscope Figure 8 4 shows the stimulus electrode voltage being monitored on Channel 1 and the current being monitored on Channel 2 It is not possible to maintai...

Страница 54: ...8 54 Chapter 8 Artifacts Stimulus Isolation Constant Current...

Страница 55: ...eset Circuitry The S88X circuitry is designed to protect internal components in the event of a short circuit or temperature increases within the output circuits If such an event occurs at either the S...

Страница 56: ...onnecting cable must be a USB 2 0 type It will have the cable type printed on the cable 4 The New Hardware Wizard should start and request a inf file The S88Xusb inf file will be on the distributed me...

Страница 57: ...impedance source In this case the voltage waveform is preserved to the electrode Current waveform and phase are only dependent on the load impedance A low source impedance can be relied on to provide...

Страница 58: ...solation units including the SIU V SIU C SIU BI and PSIU6X The S88X output is a low impedance constant voltage output having a source impedance of less than 0 2 The S88X can deliver up to 1 1 ampere f...

Страница 59: ...imulator B 59 B Appendix S88X Timing Diagrams Sx Pulse Delay Sx Pulse Duration Function Single Pulse SP Sx S1 or S2 Sx Delay Sync Out Sx Pulse Delay Sx Pulse Duration Sx Rate Function Repeating Pulse...

Страница 60: ...Function Single Train ST Sx S1 or S2 Sx Pulse Delay Sx Duration Sx Train Delay Sx Rate Train Sync Out Sx Train Rate Sx Pulse Delay Sx Train Duration Sx Duration Sx Train Delay Sx Rate Function Repeti...

Страница 61: ...Delay Sync Out S1 Function Ext Control from Train Duration TD Train Duration Sync In S1 Pulse Delay S1 Pulse Duration S1 Function Ext Control from S1 Delay SD S1 Delay Sync Out S1 Delay Sync In S2 Pu...

Страница 62: ...Function Sync with S1 SS S1 Single Repeating or Trains S1 Delay Sync Out S1 Duration S1 Rate S2 Function Single Arrhythmic SA S1 Repeating S1 Delay Sync Out S1 Rate S1 Delay S1 Duration S2 Delay S2 Du...

Страница 63: ...in PT S1 Single or Repeating Trains S2 Function Sync Train to S1 TS S1 Single or Repeating S1 Delay Sync Out S1 Rate S1 Delay S1 Duration S2 Train Delay S2 Duration S2 Rate Train Duration Train Durati...

Страница 64: ...B 64 Chapter B Appendix...

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