Related Manuals for Digitimer DS7R
Summary of Contents for Digitimer DS7R
- Page 1 Digitimer DS7R Constant Current Research Stimulator OPERATOR’S MANUAL For Research Use Only The DS7R is NOT a Medical Device “Digitimer” is a registered trademark of Digitimer Limited...
- Page 2 OPERATOR’S MANUAL: DS7R CONSTANT CURRENT RESEARCH STIMULATOR PRODUCT REGISTRATION Please take time out to register your new product. You can even do it online at:- www.digitimer.com/register Copyright © 2024 2 | Digitimer Last revised Nov2024...
- Page 3 Issue 02 Digitimer DS7R Constant Current Research Stimulator Copyright © 2024 Digitimer | 3 Last revised Nov2024...
- Page 4 Germany Helmut Wehking Vertrieb MedicalProducts Neuberg 1-b D-65193 Wiesbaden t: +49 (0)611 185 1944 f: +49 (0)611 185 1946 e: helmutwehking@wehking-med.de Please contact Digitimer for information regarding representation in other countries. Copyright © 2024 4 | Digitimer Last revised Nov2024...
- Page 5 A record of salient information, on this page, will aid the Operator should this information become necessary in the future. Date of Purchase: Dealer: Dealers Tel. Number: Dealers Fax Number: Dealers e-mail address: Contact name at Dealer: Serial Number of Unit: Other Notes: Copyright © 2024 Digitimer | 5 Last revised Nov2024...
- Page 6 WARRANTY INFORMATION Limited Warranty Digitimer Limited warrants to the first purchaser, for a period of one year from the date of purchase, that this Digitimer Instrument (hereafter referred to as the “Product”) will be free from defective workmanship and materials, and agrees that it will, at its option, either repair the defect or replace the defective Product or part thereof at no charge to the purchaser for parts and labour.
- Page 7 Digitimer Limited does not make our customer list available to anyone else. Any information that you provide to us is strictly confidential.
- Page 8 OPERATOR’S MANUAL: DS7R CONSTANT CURRENT RESEARCH STIMULATOR TABLE OF CONTENTS Contact Addresses Manufacturer Main Representative Purchase Information Warranty Information Limited Warranty Obtaining Warranty Service Product change or discontinuation Register your purchase for a warranty extension Why register your purchase? How to register your purchase...
- Page 9 'Pulse Polarity' Control “Too-fast” Warning and Cut-out 'Current Max.' Control and 'x1/x10' Range Switch 'Volts Max.' Control 'Out of Compliance' Indicator Trigger Connections to the DS7R Input Trigger Output Trigger Input/Output Trigger Polarity Electrical Characteristics of Triggers Trigger pulse to output stimulus relationship Copyright ©...
- Page 10 OPERATOR’S MANUAL: DS7R CONSTANT CURRENT RESEARCH STIMULATOR Electrode Selection & Connection Selecting Appropriate Stimulation Electrodes Electrode Material Electrode Fixation Electrode Dimensions Electrode Lead Wires Electrode Placement Initial Hardware Check Section 4 – Device Testing Operational Tests Recurrent Testing of the DS7R...
- Page 11 The current output of the DS7R is adjustable over the range 0mA to 999mA, with a compliance voltage variable from less than 100V to 400V. The pulse duration range can be varied from 50µs to 2 ms in six steps.
- Page 12 Users of the DS7R should have read and fully understood this document before proceeding. Although the DS7R is not a medical device, it has been designed for safe use in human research applications and meets all of the following standards:- ...
- Page 13 Stimulator. Indications for Use The Digitimer DS7R is an electrical stimulator intended to be used to apply a stimulus to a human subject via surface electrodes. It can be used to elicit a response from peripheral nerve fibres or muscle during research studies of human physiology, psychology and neuroscience.
- Page 14 As an instance of such dangers, it is likely that when using the DS7R stimulator with recording apparatus, it will be necessary to have an earth/ground electrode on the subject somewhere in the vicinity of the recording electrodes.
- Page 15 2 years. Please contact us for a reference number and instructions before despatching the unit. As no parts of the DS7R are expected to age the only limitation to the service life is likely to be the ongoing ability to replace electronic components that may randomly fail. The components chosen are used conservatively and are all well-established parts so availability can be expected for many years.
- Page 16 OPERATOR’S MANUAL: DS7R CONSTANT CURRENT RESEARCH STIMULATOR MAINS CONNECTIONS The DS7R is shipped complete with a safety tested mains lead (fitted with a suitable moulded mains plug) to most countries. If the mains plug supplied is not suitable, please advise Digitimer of the correct plug for your country.
- Page 17 Transport Range -40°C to 70°C 10 to 100%, non-condensing. Other Power: 100 - 120V or 200 - 240V @ 47-63 Hz Rating: <30VA Case Material UL94 V-0 Flame Retardant. Case Screw: 2.5mm Hex/Allen key compatible. Copyright © 2024 Digitimer | 17 Last revised Nov2024...
- Page 18 OPERATOR’S MANUAL: DS7R CONSTANT CURRENT RESEARCH STIMULATOR EU DECLARATION OF CONFORMITY Copyright © 2024 18 | Digitimer Last revised Nov2024...
- Page 19 7. x1 and x10 RANGE selection switch. For the DS7R this gives either an output range of 0 - 100mA, as indicated in the window of the Current Amplitude Control or 0 - 1000mA by multiplying Current Amplitude Control display by a factor of ten.
- Page 20 12. *A FAULT is indicated by an amber LED. When lit this indicates that the unit has detected a possible internal fault and should not be used. This LED will also illuminate if the DS7R is triggered “too fast” (i.e. <10ms repetition interval) in Alternating Polarity Mode. NB: As a test, this indicator will illuminate at power-on for a few seconds.
- Page 21 Copyright © 2024 positive (normal) polarity. (reverse) polarity. alternating pol Off (power) - Indicates OFF Digitimer | 21 µs Last revised Nov2024 Off (power) - Indicates OFF On (power) - Indicate e of this equipment. position of Mains Power...
- Page 22 OPERATOR’S MANUAL: DS7R CONSTANT CURRENT RESEARCH STIMULATOR REAR PANEL COMPONENTS 1. Mains inlet. Connect only to correct mains supply using supplied lead with moulded mains plug. THIS UNIT MUST BE EARTHED. The mains lead must contain the PROTECTIVE EARTH CONDUCTOR.
- Page 23 DS7A - Constant Current Stimu ear Panel Panel Digitimer have REAR PANEL SYMBOLS Panel Rear Panel equipment com Digitimer have declared that this Rear Panel Rear Panel Equipotentiality Connector Digitimer have declared that equipment complies with the Me Device Directiv Digitimer have declar Digitimer have declared that Equipotentiality Connector.
- Page 24 SECTION 3 – CONFIGURATION & OPERATION INTRODUCTION As the DS7R is capable of delivering high voltages and currents, it is vital for the safety of both the operator and the subject that the stimulator controls and the theory of operation are fully understood.
- Page 25 The graph shows that at pulse durations in excess of 500µs, the maximum pulse energy delivered into 1000Ω load by the DS7R exceeds the 50mJ limit imposed by the medical device standard (IEC 60601-2-40) for evoked potential electrical stimulators*. The DS7R is NOT a medical device and is NOT suitable for human diagnostic or treatment use.
- Page 26 PW is the Pulse Duration set on the unit, in microseconds (µs) Imax is the stimulus current, in milliamps (mA) In most cases of human stimulation this graph will not be of concern but when the DS7R is used with certain preparations it may have to be referred to.
- Page 27 Issue 02 Copyright © 2024 Digitimer | 27 Last revised Nov2024...
- Page 28 OPERATOR’S MANUAL: DS7R CONSTANT CURRENT RESEARCH STIMULATOR STIMULUS CONTROLS There are four parameters on the unit that determine the strength and polarity of the stimulus given to the subject. These are:- Stimulus Duration set by 'Pulse Duration' control Stimulus Polarity set by the 'Pulse Polarity' control ...
- Page 29 1 second afterwards. This will cause the unit to immediately stop delivering stimuli as well as turning on the Amber “Fault” LED. When the DS7R has gone into this error state, the Output Enable switch must be moved to “OFF” (downwards) to reset the DS7R's error logic.
- Page 30 (+3 to +15V) +ve edge, TTL compatible). Foot switch input – 3.5mm mono socket allows a foot switch to trigger the unit. All trigger connections to the DS7R must be made to the rear panel, in the “TRIGGER” zone, hi-lighted in red below.
- Page 31 Issue 02 INPUT TRIGGER The DS7R is factory set to trigger from the positive going edge of an applied external signal which should be between TTL (+5V) and +15V in amplitude and of at least 5µs duration. It can be changed so that the DS7R triggers from a negative going (from a positive voltage greater that +3V, to zero volts) input, The minimum voltage that is applied to this socket is -0.5V...
- Page 32 On no account should a grounded oscilloscope or other monitoring device be connected to the front panel output sockets of the DS7R while a subject is connected to the stimulator. Copyright © 2024...
- Page 33 Issue 02 SELECTING APPROPRIATE STIMULATION ELECTRODES Digitimer does not supply any electrodes with the DS7R stimulator as it can be used for a variety of applications and it is expected that most operators will already be familiar with the type of electrodes suitable for transcutaneous peripheral nerve/muscle stimulation and may have a preferred supplier.
- Page 34 Trigger button is pressed the system acquires a sweep of data. - or - If the Triggering is set for the DS7R to be triggered by a data acquisition system - check that when the recording system sends a trigger pulse the DS7R TRIGGER indicator flashes.
- Page 35 - arrange the “recording electrode” leads so that they each run parallel to one of the “Stimulating Electrode” leads; - with the DS7R Output Enabled, a suitable stimulus intensity (start low at 5mA, and increase if necessary) and EMG amplifier settings, the data acquisition system should be able to record the artefact from the stimulator operating.
- Page 36 1. With SW1 open set voltage control to 400V, pulse duration 1000 microseconds and current control to 100 mA (Dial at 10.0 and on x10 range). Trigger DS7R and record stimulus output potential generated across the 100R resistor - should be 10V peak, 1ms wide. Check that the amber "Trigger"...
- Page 37 Before commencing the test procedure it is important to fully understand the operation of the DS7R by reading the Operator's Manual. There is no requirement, in any of these tests, to open the case of the DS7R. All repair procedures should be referred to Digitimer or a local distributor.
- Page 38 Leakage Currents - Connect the DS7R to the test equipment according to the instructions for a Class 1 device with Type BF applied parts. The applied parts of the DS7R are the red and black output terminals on the front panel. As they are Type BF they may be tested as one part.
- Page 39 Issue 02 Copyright © 2024 Digitimer | 39 Last revised Nov2024...
- Page 40 Digitimer Digitimer Limited 37 Hydeway Welwyn Garden City Hertfordshire AL7 3BE...
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