Research Isometric Transducer 0 to 5 grams and 0 to 50 grams
Contents
1. The high and low gain trim pots are used to adjust the range The right hand trim pot is factory set to deliver 5 0 VDC for 5 0 gram The center trim pot is fac tory set to deliver 5 0 VDC for 50 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 5 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 4 V High Gain Tim A Low Gain Trim a 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 z Harvard A2. Research Isometric Transducer 0 to 5 grams and 0 to 50 grams User s Manual Research Isometric Transducer 0 to 5 g and 0 to 50 g 110 VAC 60 Hz MAI 72 4481 Research Isometric Transducer 0 to 5 g and 0 to 50 g 220 VAC 50 Hz MAI 72 4484 HARVARD APPARATUS WEEE RoHS Compliance Statement EU Directives WEEE and RoHS To Our Valued Customers We are committed to being a good corporate citizen As part of that commitment we strive to maintain an environmentally conscious manufacturing operation The European Union EU has enacted two Directives the first on product recycling Waste Electrical and Electronic Equipment WEEE and the second limiting the use of certain substances Restriction on the use of Hazardous Substances RoHS Over time these Directives will be implemented in the national laws of each EU Member State Once the final national regulations have been put into place recycling will be offered for our products which are within the scope of the WEEE Directive Products falling under the scope of the WEEE Directive available for sale after August 13 2005 will be identified with a wheelie bin symbol Two Categories of products covered by the WEEE Directive are currently exempt from the RoHS Directive Category 8 medical devices with the exception of implanted or infected products and Category 9 monitoring and control instruments Most of our products fall into either Category 8 or 9 and are currently exempt
3. f purchase At its option Harvard Apparatus will repair or replace the unit s if it is found 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 two 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
4. from the RoHS Directive We will continue to monitor the application of the RoHS Directive to its products and will comply with any changes as they apply Do Not Dispose Product with Municipal Waste Special Collection Disposal Required 5 Harvard Apparatus Research Isometric Transducer User s Manual Table of Contents SUBJECT PAGE NO Warranty and Repair Information ssss000s 2 Theory Of Operation cccccsssssseeeceeesesseeeseeneeneees 3 Operation Transducer Mounting ccsseceeeeeeeeeeeeeees 4 Positioning the Muscle Sample 0668 4 Splash oMMON cs Pee ccetdy cava vanes eer ea seus wevaunvccents 4 General Information Amplifier Power Supply c scceeeeeeeeeees 5 Front Panel Controls Range Selector SWIICH weeeeccsecccsssessssnsssenseees 5 ONET is ie a Leduaratnench nai tanaad ihren aa 5 Internal Controls and Adjustments 00 6 Electrical Output iscsi iii ek ees ieee ee ete 6 Maintenance and Storage ccccccceeeeeeeeeees 6 Serial NOME picciiicnnaackcantacrakemat adm 6 Transducer Diagram se esessseeeeeeeeeeeees 7 Harvard Apparatus Research Isometric Transducer User s Manual Warranty and Repair Information 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 two years from date o
5. h hardware that is as rigid as possible such that all the muscle forces are recorded i e captured 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 a loop 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
6. in the splash shield without touching the edges See Figure 1 above 5 Harvard Apparatus Research Isometric Transducer User s Manual General Information 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 5 0 gram and 50 gram See Fig 2 1 In the 5 0 gram position a 5 0 gram force produces a 5 VDC output 2 In the 50 gram position a 50 gram force produces a 5 VDC output B Offset The OFFSET control enables the user to set a zero output voltage for any pre load 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 3a_ Splash Shield A Signal Cable Power Supply Z W S S i External ISOMETRIC VOLTS Offset TRANSDUCER OUTPUT Control Range Selector 12 Volt AC Wall Transformer sih Ja 12 Volt AC f J Cable VV Figure 2 Diagram of Isometric Transducer 4 Harvard Apparatus Research Isometric Transducer User s Manual General Information Internal Controls and Adjustments On the rear panel of the power supply are three small access holes to the trim pots See Fig 3
7. pparatus Research Isometric Transducer User s Manual Overall Transducer Diagram Grooved Shaft Mounting Handle Splash Shield Non Stretch String to Muscle Specimen Power Supply Signal Cable External Offset Control Range Selector 12 Volt AC Wall Transformer 12 Volt AC Cable BNC Connector Z High Gain Trim Low Gain Trim S o Offset Trim S AA To Transducer Sensing Head 12 Volt AC Input Figure 4 Overall Transducer Diagram
8. warranty gives you specific rights and you may also have other rights which vary from state 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 5 Harvard Apparatus Research Isometric Transducer User s Manual Theory of Operation 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 5 0 or 50 gram range mode The linearity is within 1 with a high DC voltage output and freedom from drift 4 Harvard Apparatus Research Isometric Transducer User s Manual Operation 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 wit
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