603000 603001 - Harvard Apparatus
Research Grade
Isotonic Transducer
User's Manual
Research Grade Isotonic Transducer, 110 VAC/60 Hz
Research Grade Isotonic Transducer, 220 VAC/50 Hz
60-3000
60-3001
Table of Contents
Harvard Apparatus Research Isotonic Transducer User’s Manual
1
SUBJECT
PAGE NO.
Warranty and Repair Information ........................2
Theory of Operation ..............................................3
General Information............................................4-5
Specifications......................................................4
Amplifier/Power Supply ......................................4
Internal Controls and Adjustments ....................5
Electrical Output ................................................5
Maintenance and Storage ..................................5
Serial Number ....................................................5
Operations ..........................................................6-8
Transducer Setup ..............................................6
Smoot Muscle/Isolated Organ Preparation ........7
Skeletal Muscle Preparation ..............................8
General Information
Harvard Apparatus Research Isotonic Transducer User’s Manual
2
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 found
to be defective as to workmanship or material.
This warranty does not extend to damage resulting from misuse, neglect or abuse, normal 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 original device.
This 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 practical, enclose a sample or drawing.We offer a complete reconditioning service.
CAUTION: Not for clinical use on human patients.
Theory of Operation
Harvard Apparatus Research Isotonic Transducer User’s Manual
3
This Isotonic Transducer converts rotary motion into a proportional DC voltage. A
moveable capacitor plate attached to the rotating shaft and fixed capacitor plates form
a differential capacitor. A patented electronic circuit, (U.S. Patent #4142144) transforms capacitance change linearity into a DC voltage equal to 2.0 volts for 15° of rotation.
The use of the capacitance principle produces the following advantages:
1) Extremely low moment of inertia of 0.36 cm which is an order of magnitude
better than comparable units. This low inertia insures that complex quick
changes are faithfully reproduced.
2) Excellent linearity of ±1%.
3) High voltage output, ±2.0 volts.
4) Excellent stability and freedom from drift.
+ voltage
0° = 0 voltage
– voltage
Signal Cable
Power Supply
ISOTONIC
TRANSDUCER
VOLTS
OUTPUT
12 Volt AC Wall
Transformer
12 Volt AC
Cable
Figure 1. Research Grade Isotonic Transducer
General Information
Harvard Apparatus Research Isotonic Transducer User’s Manual
4
Specifications
Linearity
±1%
Moment of Inertia
0.35 g•cm, without hardware
Breakaway Torque
0.05 g•cm
Accuracy
±1%
Rotation
±15°
Output
±2.0 VDC for ±15° rotation
Sensitivity
1 minute of arc
Output Impedance
2k
Amplifier/Power Supply
a) The entire transducer is powered by a 12 volt AC wall transformer.
b) There is no ON/OFF switch. The unit can remain powered, as shown on the
digital meter, for the entire experiment.
Signal Cable
Power Supply
ISOTONIC
TRANSDUCER
VOLTS
OUTPUT
12 Volt AC Wall
Transformer
12 Volt AC
Cable
Figure 1.Amplifier/Power Supply
General Information
Harvard Apparatus Research Isotonic Transducer User’s Manual
5
Internal Controls and Adjustments
On the rear panel of the power supply are three small access holes to the trim pots.
The GAIN trim pot is accessed through the center hole and is factory set to deliver 2.0
VDC for 15° of rotation. It can be adjusted to deliver between 1 – 3 volts output for
15° of rotation.
The OFFSET adjustment trim pot is located on the extreme left and has been factory
adjusted so that when the flat of the shaft is horizontal, output is zero volts. This can
also be user adjusted as required.The right hole is not used.
Electrical Output
a) Binding post are provided on the power supply for output connections. Red
is positive (+); black is negative (–) and also ground.
b) Output voltage is ±2.0 VDC for rotation up to ±15°. Output impedance is 2
kΩ for direct connection to all recorders.
Binding Posts
_
Gain Trim
+
Offset Trim
To Transducer
Sensing Head
12 Volt AC input
Figure 2. 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.
Operations
Harvard Apparatus Research Isotonic Transducer User’s Manual
6
Transducer Setup
This transducer is supplied with complete hardware to set up the transducer for
smooth muscle, isolated organ, or exposed heart applications including bio-assay techniques in an organ bath, or skeletal muscle experiments such as the muscle twitch
using the frog gastrocnemius preparation.
The stainless steel mounting rod of the transducer should be securely fastened to a
rigid stand for optimal use. It should be noted that maximum sensitivity to muscle
movement occurs when the string connected to the muscle is closest to the rotating
shaft. In this position, small movements create larger angular motion (see Fig. 1).
When the lever is horizontal and in the same plane as the handle, the electrical output
is zero (see Fig. 1). Clockwise rotation produces a positive voltage whereas counterclockwise rotation produces a negative voltage. The protecting ears of the handle
bracket limit rotation to ±18°. In addition, there are internal limit stops.
Nylon Screw
Rotating Shaft
Lever Arm
+ voltage
Mounting Rod
0° = 0 voltage
– voltage
Figure 3. Transducer Setup
Operations
Harvard Apparatus Research Isotonic Transducer User’s Manual
7
Smooth Muscle/Isolated Organ Preparation
For smooth muscle or isolated organs preparations, the following items will be used:
1) Simple Wooden or Aluminum Levers
2) Lever-Holding Clamp
To use the levers, the lever-holding clamp is attached to the shaft of the transducer
using the Allen wrench provided. Make sure that the set screw seats on the flat portion
of the shaft. The clamp must be attached to the shaft so that the Allen screw seats on
the flattened portion of the shaft. The wooden or aluminum lever is passed through the
hole in the clamp and is held in place by the spring of the clamp (see Fig. 2).
Nylon Screw
Allen Screw
Mounting Rod
+ voltage
Lever Arm
(Aluminum or Wood)
0° = 0 voltage
– voltage
Lever Clamp
Figure 4. Smooth Muscle/Isolated Organ Preparation
Operations
Harvard Apparatus Research Isotonic Transducer User’s Manual
8
Skeletal Muscle Preparation
For skeletal muscle contraction the following items will be used:
1) Muscle Lever
2) After Loading Screw and Spring
3) Scale Pan
4) Weights
Install after loading screw and spring as shown (see Fig. 3). Using an Allen wrench,
install muscle lever so that Allen screw bears on shaft. Attach double hook to one of
the two positions on the muscle lever and add the scale pan (see Fig. 3).
Mounting Rod
After Loading
Screw & Spring
Rotating Shaft
Lever Arm
+ voltage
0° = 0 voltage
Scale Pan
– voltage
Weights
Figure 5. Skeletal Muscle Preparation
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