MGS-2 User`s Manual - LKC Technologies, Inc.
Contents
1. system or when sold by another manufacturer as part of their complete system This notice does not affect use of the device on animals Introduction The MGS 2 is a stand alone monocular ganzfeld photic stimulator designed for use in visual electrodiagnostic testing The stimulator conforms to the requirements of the ISCEV Standard for Clinical Electroretinography The MGS 2 is designed to be used with an electrophysiology recording system to perform the electroretinogram ERG or flash visually evoked potential flash VEP The equipment has been tested in accordance with IEC60601 1 and meets all requirements for Non isolated Patient Connections i e electromedical apparatus with intentional electrical or conductive contact other than contacts intended to be connected to the exposed heart or to a foreign conductive pathway to the heart or great vessels Setting up the MGS 2 Before you can use the MGS 2 you must set it up connect it to your recording system and configure it to match your recording system The MGS 2 system consists of two parts e The Main Unit the box e The Hand held Mini Ganzfeld Stimulator called the Kiirbisfeld Step 1 Make sure the MGS 2 is properly configured to match your recording system See the section titled Configuring the MGS 2 to Match Your System on the next page If you have trouble figuring this out call or send a fax e mail to the customer support at LKC for assistance Step 2 Plug t2. factory for service Provide for services not performed or authorized by us 3 Provide for the cost of repairing instruments that have obviously been abused or subjected to unusual environments for which they have not been designed We will be happy at any time to discuss by phone letter FAX or e mail suspected defects or aspects of instrument operation that may be unclear We advise you to inform us by phone letter FAX or e mail of the nature of the defect before returning an instrument for repair Often a simple suggestion will solve the problem without returning an instrument to the factory If we are unable to suggest something that solves the problem we will advise you as to what parts of the equipment should be returned to the factory for service DEFECTS OCCURRING AFTER WARRANTY PERIOD Charges for repairs after the warranty period will be based upon actual hours spent on the repair at the then prevailing rate plus cost of parts required and transportation charges or you may elect to purchase an extended warranty We will be happy to discuss by phone letter FAX or e mail any problem you may be experiencing LKC Technologies Inc Customer Support 800 638 7055 FAX Number 301 330 2237 e mail support Ikc com Important Notice The MGS 2 Mini Ganzfeld System is approved for human use by the US Food and Drug Administration FDA only when used with an LKC Technologies UTAS or EPIC visual electrodiagnostic test
3. MGS 2 Mini Ganzfeld system USER S MANUAL Version 1 4 LKC Technologies Inc 2 Professional Drive Suite 222 Gaithersburg MD 20879 USA 301 840 1992 800 638 7055 sales lkc com CE 0086 WARRANTY LKC Technologies Inc unconditionally warrants this instrument to be free from defects in materials and workmanship provided there is no evidence of abuse or attempted repairs without authorization from LKC Technologies Inc This Warranty is binding for one year from date of initial delivery and is limited to servicing and or replacing any instrument or part thereof returned to the factory for that purpose with transportation charges prepaid and which are found to be defective This Warranty is made expressly in lieu of all other liabilities and obligations on the part of LKC Technologies Inc DAMAGE UPON ARRIVAL Each instrument leaves our plant after rigorous tests in perfect operating condition The instrument may receive rough handling and damage in transit The shipment is insured against such damage The Buyer must report in writing immediately any concealed or apparent damage to the last carrier Report any damage also to us and issue an order for replacement or repair DEFECTS OCCURRING WITHIN WARRANTY PERIOD Parts of units may develop defects which no amount of initial testing will reveal The price of our instruments makes provision for such service but it does not l Provide for transportation charges to our
4. The STIM and BACK LIGHT buttons are operational only when the Main Menu is displayed MGS 2 provides 2 kinds of stimuli Flash and Flicker The features of each stimulus can be set in the according sub menu Flash flicker of any available intensity can be triggered individually or with background light When the STIM button is pressed it will e fire a single flash if the cursor arrow points to Flash or Background e start flicker until the STIM button is released if the arrow points to Flicker oe If the MGS 2 is set to accept a trigger signal from your recording system make sure that external trigger input signals can be accepted by the MGS 2 only at the Main Menu Each trigger input pulse fires a single flash no matter the cursor arrow is pointing to Flash Flicker or Background Flicker can be obtained by sending periodical pulses to the unit at any rate less than 100Hz Use buttons A V and to select functions sub menus Press the SEL button to switch to the according sub menu Features for any function e g intensity rate etc can be re selected in the sub menus Flash Menu Flash Intensity OdB The value beside the symbols is the current flash level Using buttons or gt can make a change Once button or gt is pressed the symbol will turn to a pointer which indicates that no option is selected yet Press the SEL button to select the dB value After a value is selected shown by the pointer turni
5. he Kiirbisfeld into the Main Unit ms Make sure the power to the Main Unit is off before connecting or disconnecting the Kurbisfeld Step 3 Plug the Main Unit into the power mains If you are using the MGS 2 with an LKC EPIC or UTAS system plug the unit into one of the outlets on the back of the Interface Unit or MGIT 100 If you are using the MGS 2 with a system from another manufacturer you may plug the MGS 2 directly into a wall outlet The MGS 2 uses a Universal power supply As such it can be connected to any AC power source from 100 Volts to 220 Volts at either 50 or 60 Hz Step 4 Connect the MGS 2 to your recording system using the cable provided with the unit See the instructions in Configuring the MGS 2 to Match Your System on the next page to determine how to connect the cable You are now ready to use your MGS 2 stimulator Configuring the MGS 2 to Match Your System To function properly as a stimulator the MGS 2 must communicate with your recording system The MGS 2 can do this in one of two ways e The MGS 2 can accept a trigger signal from your recording equipment and trigger its stimulus by this signal e The MGS 2 can provide a trigger signal to your system to inform it that the stimulus has been triggered by pressing the STIM button either on the Main Unit or on the stimulator ws The first step in configuring the MGS 2 is to decide whether the recording system or the MGS 2 will trigger the stimul
6. he patient hold the Kiirbisfeld up to the patient s eye e The ERG requires a ganzfeld stimulus and the Ktirbisfeld must be close to the patient s eye to assure that light enters the eye evenly from all directions Be careful that the Kitirbisfeld does not dislodge the corneal electrode when it is placed over the eye e Flash VEP does not require a ganzfeld stimulus and the Kiirbisfeld may be held up to 10 cm 4 inches from the patient s eye Press the STIM button on the Kurbisfeld to present a stimulus to the patient If the Main Unit is set to Flash a single flash of the selected intensity will be presented If the Main Unit is set to Flicker a flickering stimulus will be presented until the STIM button is released MGS 2 Cleaning and Maintenance The outer plastic surfaces of the MGS 2 system may be cleaned with a damp cloth and any mild detergent The inner surface of the Ganzfeld globe must not be touched or wiped by any material because of the fragility of the reflective coating It is highly recommended that the Ganzfeld be protected with the supplied cover any time it is not in use Use low pressure filtered compressed air only to remove any dirt or dust that may have accumulated inside the globe If the reflective coating becomes damaged the Ganzfeld must be returned to LKC Technologies for refinishing l The Main Unit will send a pulse to the Trigger Out connector for each flash during this period
7. m to determine if this is the correct polarity Warning If the Trigger Out Polarity Switch is improperly set the MGS 2 may appear to operate correctly but the timing of the stimulus will be incorrect If your system requires a trigger signal going from high 5 V to low 0 V set the trigger out polarity switch SW9 2 on PCB 310134 to the on position Setting the MGS 2 switches PCB 310134 Remove the four screws on the bottom of the MGS 2 box and lift off the top cover The rocker DIP switch SW9 is located on the circuit board PCB 310134 mounted to the back of the front panel You will need to slide the front panel out of the bottom cover to gain access to the switch Turn on or turn off switches of SW9 according to the following tables SW9 1 Trigger Out Select Switch TTL level trigger output signal Open Collector trigger output signal SW9 2 Trigger Out Polarity Switch Trigger output goes high to low at stimulus Trigger output goes low to high at stimulus SW9 3 Trigger In Polarity Switch Stimulus triggers on high to low transition Stimulus triggers on low to high transition System default settings Using the MGS 2 After you have properly set up your MGS 2 you are ready to start using it LKG TECHNOLOGES MGS 2 pD LKC Technologies Inc Y BACK STIM Turning it On and Off The power switch for the MGS 2 is located on the rear of the unit Itls the only switch on the Main U
8. ng back to the star press SEL again to return to the Main Menu Available flash intensities are 25 through 5 dB in 5dB steps 0 dB 2 5 cd s m Flicker Menu Flicker Intensity x OdB Flicker Rate 30Hz The Intensity Flicker Rate features with symbols are the current settings Use buttons A and W to point to one of the two features Press button or to make a change to the feature Once button or gt is pressed the symbol will turn to a pointer which indicates that no option for the feature is selected yet Press the SEL button to select an option After both two features are selected press SEL again to return to the Main Menu Flicker Intensity 25 through 5 dB in 5dB steps Flicker Rate 5Hz through 60Hz in 5Hz steps Background Menu Background Intensity 30 cd m Fixation ON OFF Background intensity is 30cd m The current fixation status is indicated by the symbol Pressing button or gt can toggle between ON and OFF Once button or is pressed the symbol will turn to a pointer which indicates that no option for the feature is selected yet Press the SEL button to select the option then press SEL again to return to the Main Menu Computer Control MGS 2 is also computer controllable using a RS 232 serial port as an additional option Please contact LKC for further information on how to purchase this feature Presenting Stimuli to the Patient To present a stimulus to t
9. nit that is not labeled When you turn the MGS 2 on the LCD display window on the Main Unit will glow with green light and show the information as above and the 7 push buttons will turn red Whether the fixation light in the Kiirbisfeld glows a dim red or remains off depends on the last setting before the system was previously powered off After 3 seconds the LCD display will turn to the Main Menu Main Menu The Main Menu displays function names also sub menu names and the current settings of flash flicker intensity and back light brightness Main Menu Flash Background Flicker B 30 cd m F OdB MGS 2 can save all the settings in its memory Each time when the system is powered on the Main Menu will show the last settings before it was powered off The first time you power your MGS 2 the default settings of the system should be shown as above which means Stimulus Type Flash Background Light 30cd m Flash Flicker OdB 2 5cd s m Pressing the BACK LIGHT button on the front panel or the BKLT button on the back of the Kiirbisfeld will turn on the background light The brightness of background light is 30 cd mll The status of fixation light ON or OFF can be selected in the Background sub menu Pressing the STIM button either on the front panel or on the back of the Kiirbisfeld will trigger the stimulus At the same time the system will send a trigger output pulse to the TRIGGER OUT BNC connector on the rear panel
10. us If the MGS 2 is to accept a trigger signal from your recording system e Connect a cable from the trigger output of your recording system to the connector marked TRIGGER IN on the rear of the MGS 2 You must also make sure that the MGS 2 is set to properly trigger from your recording system The MGS 2 accepts a TTL level 0 to 5 V trigger input signal As it comes from the factory the MGS 2 will fire stimulus each time the trigger input signal applied to TRIGGER IN goes from low 0 V to high 5 V Consult the manual for your recording system or measure its trigger signal with an oscilloscope to determine its polarity Warning If the Trigger In Polarity Switch is improperly set the MGS 2 may appear to operate correctly but the timing of the stimulus will be incorrect If the trigger signal from your system goes from high 5 V to low 0 V set the trigger in polarity switch SW9 3 on PCB 310134 to the on position If the MGS 2 is to provide a trigger signal to your recording system Connect a cable from the connector marked TRIGGER OUT on the rear of the MGS 2 to the external trigger input of your recording system You must also make sure that the MGS 2 is set to send the proper trigger to your recording system As it comes from the factory the MGS 2 sends a TTL level trigger signal to TRIGGER OUT that goes from low 0 V to high 5 V to the recording system each time a stimulus occurs Consult the manual for your syste
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