Research Isometric Transducer Manual
Contents
1. 0VDC for 500 gram Either can be adjusted to deliver more or less output as conditions dictate The OFFSET adjustment trim pot is located on the extreme left and has been factory adjusted to center the offset control It also can be adjusted in situations where the front panel offset control does not have sufficient range It can be used to correct for static loads up to 2 5 grams Electrical Output a Binding post are provided on the power supply for output connections Red is positive black is negative and also ground See Fig 3 b Output voltage is 0 to 2 0 VDC depending upon the position of the range selector switch Output impedance is 2 kQ for direct connection to all recorders c The transducer is linear to 100 overload 1000 g 4V Binding Posts High Gain Trim Fa y 1 Low Gain Trim Z ANG Offset Trim To Transducer Sensing Head 12 Volt AC input Figure 3 Electrical Output Maintenance and Storage a No special precautions are required other than preventing corrosive solutions from entering the space where the output shaft exits the transducer b When not in use store in a clean dry place Serial Number The serial number is located on the power supply circuit board Refer to this number in any correspondence Overall Transducer Diagram PP Harvard Apparatus Research Isometric Transducer User s Manual Grooved Shaft Mounting Handl2. and none are lost in extraneous deflec tions of the mounting hardware The 55 0640 Harvard Research Support Stand is the mounting hardware of choice Its massive durable construction will not deflect under load The transducer itself should be positioned such that the output cable at the rear of the transducer ends up on the bottom See Fig 1 and 2 Positioning the Muscle Sample The transducer has a short shaft rod with a groove that projects from the front See Figure 1 below One end of the non stretching string must be formed into aloop and fastened into the groove on the shaft The other end of the string is subsequently attached to the muscle preparation The string must be at right angle to the transduc er shaft and be pulled straight downward once the final setup has been completed Mounting Handle Grooved Shaft Splash Shield Non Stretch String to Muscle Specimen Output Cable Figure 1 Positioning the Muscle Sample Splash Shield The transducer is equipped with a transparent removable plastic shield which helps to prevent buildup of salts i e corrosives which may otherwise tend to accumulate on the transducer beam shaft and migrate into the tranducer circuit See Fig 1 In time this salt buildup can deteriorate performance The cord cable wire from the beam must be directed through the slot in the splash shield without touching the edges See Figure 1 above General Information 9 Harv
3. Research Isometric Transducer 0 to 50 grams and 0 to 500 grams User s Manual Research Isomeric Transducer 0 to 50 g and 0 to 500 g 110 VAC 60 Hz 60 2996 Research Isomeric Transducer 0 to 50 g and 0 to 500 g 220 VAC 50 Hz 60 2999 Table of Contents 1 ne Warranty and Repair Information 008 2 5 Theory Of Operation scivivinsssesssissciseadessavessestindersnns 3 i Operation 0 Transducer MOUNtIN cccccccccceccssseeseeeeeteees 4 Positioning the Muscle Sample cee 4 5 Splash SING oes ssecsacindsctwnevniededabsnanteamneninndennbiions 4 General Information Amplifier Power Supply c ceeeeeeeeseeees 5 Front Panel Controls Range Selector Switch 5 81 Cle Sane ree ee ee naar ere ee ener ar eee 5 Internal Controls and Adjustments 06 6 Electrical Output eeeseeeeeeeeeeeeseeeeeeeeeeeees 6 Maintenance and Storage cccceceeeeeeeeeeeees 6 Serial Number cecechcccttecececesccaceccei tac eectacaut 6 Transducer Diagram sscedrosacestcummusiicnsadetanntecabeees 7 Warranty and Repair Information DO Harvard Apparatus Research Isometric Transducer User s Manual Serial Numbers All inquires concerning our product should refer to the serial number of the unit s Warranty Harvard Apparatus warranties the instrument s for a period of one year from date of purchase At its option Harvard Apparatus will repair or replace the unit s if it is fo
4. ard Apparatus Research Isometric Transducer User s Manual Amplifier Power Supply a The entire transducer is powered by a 12 volt AC wall transformer See Fig 2 b There is no ON OFF switch The unit can remain powered as shown on the digital meter for the entire experiment Front Panel Controls A Range Selector The range selector switch has two positions 50 gram and 500 gram See Fig 2 1 In the 50 gram position a 50 gram force produces a2 VDC output 2 In the 500 gram position a 500 gram force produces a2 VDC output B Offset The OFFSET control enables the user to set a zero output voltage for any preload value See Fig 2 It is essentially a Tare Control device since it balances out static loads such as the weight of the muscle preparation prior to contraction Mounting Handle Signal Cable Power Supply YY ISOMETRIC TRANSDUCER Offset External Control Range Selector 12 Volt AC Wall Transformer 12 Volt AC Cable Figure 2 Diagram of Isometric Transducer General Information C0 Harvard Apparatus Research Isometric Transducer User s Manual Internal Controls and Adjustments On the rear panel of the power supply are three small access holes to the trim pots See Fig 3 The high and low gain trim pots are used to adjust the range The right hand trim pot is factory set to deliver 2 0 VDC for 50 gram The center trim pot is fac tory set to deliver 2
5. e Splash Shield Non Stretch String to Muscle Specimen Signal Cab Power Supply a 4 Signal Cable External vos Offset TRANSDUCER OUTPUT Control Range Selector 12 Volt AC Wall Transformer A Aa 12 Volt AC f Cable Binding Posts High Gain Trim Low Gain Trim Offset Trim To Transducer Sensing Head 12 Volt AC Input Figure 4 Overall Transducer Diagram
6. to state Repair Facilities and Parts Harvard Apparatus stocks replacement and repair parts When ordering please describe parts as completely as possible preferably using our part numbers If practi cal enclose a sample or drawing We offer a complete reconditioning service AN CAUTION Not for clinical use on human patients Theory of Operation SO Harvard Apparatus Research Isometric Transducer User s Manual This transducer operates on the principle of converting picofarad capacitance changes into an amplified DC output voltage by means of a patented circuit U S Patent Number 412144 The transducer consists of a stiff beam suspended between two capacitor plates This forms a differential capacitor Using this principal the beam can be exceptionally stiff approaching the ideal of measuring force without motion As an example for a force of 1 gram the beam deflection is a maximum of only 10 microns in either the 50 or 500 gram range mode The linearity is within 1 with a high DC voltage output and freedom from drift Operation ae Harvard Apparatus Research Isometric Transducer User s Manual Transducer Mounting The transducer comes with an integral short rigid mounting handle See Fig 1 and 2 To obtain maximum advantage of stiff beam characteristics of the transducer it should be positioned and held in place with hardware that is as rigid as possible such that all the muscle forces are recorded i e captured
7. und to be defective as to workmanship or material This warranty does not extend to damage resulting from misuse neglect or abuse nor mal wear and tear or accident This warranty extends only to the original customer purchaser IN NO EVENT SHALL HARVARD APPARATUS BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES Some states do not allow exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you THERE ARE NO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR OF ANY OTHER NATURE Some states do not allow this limitation on an implied warranty so the above limitation may not apply to you If a defect arises within the one year warranty period promptly contact Harvard Apparatus Inc 84 October Hill Road Holliston Massachusetts 01746 1371 using our U S only toll free number 1 800 272 2775 or dial 508 893 8999 Goods will not be accepted for return unless an RMA returned materials authorization number has been issued by our customer service department The customer is responsible for shipping charges Please allow a reasonable period of time for completion of repairs replacement and return If the unit is replaced the replacement unit is covered only for the remainder of the original warranty period dating from the purchase of the orig inal device This warranty gives you specific rights and you may also have other rights which vary from state
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