WPI ISDB User manual
WORLD
PRECISION
INSTRUMENTS
ISDB
ISO-DAM 8A and BRIDGE8
Serial No._____________________
www.wpiinc.com
INSTRUCTION MANUAL
060920
ISDB
World Precision Instruments i
Copyright © 2020 by World Precision Instruments. All rights reserved. No part of this publication may
be reproduced or translated into any language, in any form, without prior written permission of World
Precision Instruments, Inc.
CONTENTS
BRIDGE8............................................................................................................................................ 1
Introduction................................................................................................................................ 1
Unpacking ............................................................................................................................. 2
Instrument Description ........................................................................................................... 2
Operations.................................................................................................................................. 2
Positioning the Output to Zero........................................................................................ 3
Bridge Switch........................................................................................................................ 3
Transducer Calibration ...................................................................................................... 4
Example ................................................................................................................................. 4
General Amplication......................................................................................................... 4
Specications ............................................................................................................................. 4
ISO-DAM8A....................................................................................................................................... 6
Introduction................................................................................................................................ 7
Notes and Warnings........................................................................................................... 7
Unpacking ............................................................................................................................. 7
Instrument Description ........................................................................................................... 8
Noise and Interference...................................................................................................... 8
Input Connection................................................................................................................. 8
Input Cable............................................................................................................................ 9
Source Select Switch........................................................................................................... 9
Balance Adjustment............................................................................................................ 9
Output.................................................................................................................................... 9
Filters....................................................................................................................................10
DC Oset .............................................................................................................................10
Single Channel Installation..............................................................................................10
Operating Instructions...........................................................................................................10
Input Connections.............................................................................................................11
Output Connections .........................................................................................................12
Grounding ...........................................................................................................................12
Shielding ..............................................................................................................................12
Idle Settings ........................................................................................................................12
Control Adjustment ..........................................................................................................12
Specications ...........................................................................................................................13
WARRANTY .....................................................................................................................................15
Claims and Returns ................................................................................................................15
Repairs.......................................................................................................................................15
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BRIDGE8
The following symbols are used in this guide:
This symbol indicates a CAUTION. Cautions warn against actions that can cause
damage to equipment. Please read these carefully.
This symbol indicates a WARNING. Warnings alert you to actions that can cause
personal injury or pose a physical threat. Please read these carefully.
NOTES and TIPS contain helpful information.
Fig. 1—Up to eight rackmountable ISO-DAM8A and Bridge8 modules can be combined in a
single chassis.
Introduction
Any combination of ISO-DAM8A or Bridge-8 modules may be combined in the same
instrument main frame. Bridge-8 includes a dierential amplier featuring high input
impedance, high common mode rejection of electrical interference and low current
leakage input terminals. Force, pressure, temperature, displacement, light and other
physical parameters are readily measured. Thermocouple wire transducers with cold
junction references for a wide range of temperature monitoring are also available.
2 World Precision Instruments
Each channel contains: a regulated DC power supply, 10V (+5 and –5V with respect
to signal ground) to provide DC power to transducers and a precision dierential
amplier with selectable voltage amplication and variable position adjustment
control. Each module includes a low pass lter with conditioner for strain gauges and
other transducers.
Unpacking
Upon receipt of this instrument, make a thorough inspection of the contents and
check for possible damage. Missing cartons or obvious damage to cartons should be
noted on the delivery receipt before signing. Concealed damage should be reported
at once to the carrier and an inspection requested. Please read the section entitled
“Claims and Returns” on page 15 of this manual. Please contact WPI Customer
Returns: Do not return any goods to WPI without obtaining prior approval (RMA
# required) and instructions from WPI’s Returns Department. Goods returned
(unauthorized) by collect freight may be refused. If a return shipment is necessary,
use the original container, if possible. If the original container is not available, use a
suitable substitute that is rigid and of adequate size. Wrap the instrument in paper or
plastic surrounded with at least 100mm (four inches) of shock absorbing material. For
further details, please read the section entitled “Claims and Returns” on page 15 of
this manual.
Instrument Description
Single Channel Installation
1. Remove two screws on the right and left sides of the instrument enclosure,
respectively. Then remove eight screws on the bottom of the enclosure.
2. Slide the internal chassis out of the enclosure.
3. Remove the two screws holding the blank panel where the new channel is to be
installed.
4. Plug the connector of this channel into the new module and then secure the
channel in position with two screws.
5. Slide the chassis into the enclosure and reinstall all screws.
Operations
Transducers are connected to Bridge-8 via the 8-pin transducer input connector on
the front panel. Spare 8-pin DIN plugs are provided with each instrument to allow
you to rewire the cables of other manufacturers’ transducers to connect to Bridge-8
modules (Fig. 2).
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2
5
3
8
7
6
1
4
S H IE L D
- 5 V
+ 5 V
+ O UT
- O U T
TRANSDUCE R P L UG (SOL DER SIDE)
G ND
NC
NC
Fig. 2—Wiring schematic for the 8-pin DIN connection.
Positioning the Output to Zero
Insert the transducer plug into the panel transducer input connector. Switch the
Gain Select switch for the channel being used to x10 and set the Bridge switch to
Dierential. Turn on the Power switch at the top of the panel. One or both of the
two red Oset Adjust indicator lamps will light if a transducer is plugged into the
appropriate connector on the front panel. Output coaxial connectors for all channels
are located on the rear panel of the instrument. If the – lamp is lit, the output voltage
level is minus. If the + lamp is lit, the output voltage level is positive. To bring the
output voltage level to nearly zero volts, adjust the Oset Adjust knob above the Gain
switch so that both lamps are lit together. A signicant increase in the sharpness or
resolution of the zero adjustment may be achieved by increasing the gain to x100.
Bridge Switch
Many transducers congured as Wheatstone bridges with four resistive elements will
directly access the dierential amplier, as represented in Fig. 2. When the Bridge
switch is in the Dierential position, both inputs of the dierential amplier, inverting
and non-inverting, are connected to the signal terminals of the transducer bridge. In
single-ended operation, the inverting input of the dierential amplier is connected
to a variable reference potential leaving the non-inverting input available to the signal
source. In the Gnd (ground) position both the inverting and the non-inverting inputs
are connected to ground.
+ out
- out
SHIELD
-
+
+5 v
-5 v
1
2
3
4
Fig. 3—This transducer is congured as a Wheatstone bridge with four resistive elements.
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Transducer Calibration
Bridge-8 provides xed and accurate decade amplication steps. Of most interest to
the user, however, may be the conversion factor from the physical variable—grams,
mm of Hg, mm of displacement—to output voltage. Since the transducer’s conversion
factor is often not exactly known and varies with the voltage applied to the sensor
(10 volts from Bridge-8), it is therefore necessary for the user to calibrate the system
using known forces, pressures or displacements to scale the output of Bridge-8
quantitatively with the original physical parameter being measured.
Example
A typical pressure transducer is nominally rated at 5 microvolts out per volt of
excitation per mm of Hg. To compute the approximate output from Bridge-8 for this
transducer:
5 µV/V • 10 V • Amplication = 0utput µV per mm Hg
Thus, if we had selected x100 Amplication, the output per mm Hg would be
approximately 5 mV per mm Hg. Since the nominal rating of 5 µV per volt is usually
not exact, the user must, in the end, calibrate the transducer with a known hydrostatic
pressure to obtain an accurate conversion factor. (WPl’s model PM015 Pressure
Monitor/Calibrator is a suitable hydrostatic pressure calibration device.)
General Amplication
For transducer types other than resistive bridges, such as active transistor circuits,
magnetic, photocell or piezoelectric devices, the instrument’s dierential amplier may
still be used for signal amplication in dierential and single-ended modes. Note that
pin 7, instrument ground, must be connected to the circuit ground of the input source
to achieve eective amplication. Careful shielding of signal generating devices will
result in lower noise “pickup” by the signal input wiring.
SHIE LD
-
+
3
2
7signal gnd
+ 5
-5
ext.
sig.
source
Specications
Voltage Amplication .....................................x1, x10, x50, x100, x500, x1000 & adjustable
Input Impedance .................................................................................................................> 1012Ω
Input Leakage Current ...............................................................................< 0.1pA at 25°C, typ.
Voltage Oset Adjustment ............................................................. ± 50mV (low oset range),
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............................................................................................................. ± 100mV (high oset range)
Amplier Output Voltage ............................................................................± 5.0V (10mA, max.)
Transducer Excitation .....................................................................10V (± 5.0V) (100mA, max.)
Low Pass Filter Band (kHz) ...................................... 0.03, 0.1, 0.3, 1, 5, 10, and “wide band”
Enclosure Dimensions............................................................... 7 x 17 x 9.2˝ (18 x 43 x 23cm)
F-QC-006 Rev C
WORLD PRECISION INSTRUMENTS, LLC.
175 Sarasota Center Boulevard
Sarasota, FL 34240-9258 USA
Telephone: (941) 371-1003 Fax: (941) 377-5428
E-mail: [email protected]
DECLARATION OF CONFORMITY CE
We: World Precision Instruments
175 Sarasota Center Boulevard
Sarasota, FL 34240-9258 USA
As the manufacture/distributor of the apparatus listed, declare under sole responsibility
that the product(s):
WPI PN: ISDB SERIES
To which this declaration relates is/are in conformity with the following standards or
other normative documents:
Safety:
EN 61010-1:2010+A1:2019
EMC:
EN 61326-2-3:2013, EN 61326-1:2013
EN 61000-3-2:2014, EN 6100-3-3:2013
And therefore conform(s) with the protection requirements of Council Directive
2014/30/EU relating to electromagnetic compatibility and Council Directive 2014/35/EU
relating to safety requirements and Council Directive 2011/65/EU relating to hazardous
substances:
Issued on: March 24, 2020
______________________________
President of WPI
6 World Precision Instruments
ISO-DAM8A
The following symbols are used in this guide:
This symbol indicates a CAUTION. Cautions warn against actions that can cause
damage to equipment. Please read these carefully.
This symbol indicates a WARNING. Warnings alert you to actions that can cause
personal injury or pose a physical threat. Please read these carefully.
NOTES and TIPS contain helpful information.
Fig. 4—Up to eight rackmountable ISO-DAM8A and Bridge8 modules can be combined in a
single chassis.
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Introduction
The Iso-DAM8A is a modular bioamplifer designed for use with the Iso-DAM8 chassis,
which can accommodate up to 8 modules. The Iso-DAM8A input stage is dierential
and is isolated from the AC power system. For example, there is no electrical
connection to the AC power circuit ground. Isolated pre-amplication has important
advantages over non-isolated ampliers:
• There is no signicant current can ow from the preamplier input terminals
to ground. Therefore, input connectors are intrinsically safe and cannot
cause electrical shock at the site of measurement.
• Problems caused by “ground loops” are eliminated.
Electrodes or other signal sources may be connected directly to the Iso-DAM8A
input connector, or an optional active headstage (WPI Part #74040) may be used.
The headstage connects to the Iso-DAM8A through a 5-foot cable. It contains a
high impedance dierential amplier in a small metal housing. Electrodes may be
connected directly to the headstage, which can be positioned at the measurement
site, minimizing electrical noise pickup and stray capacitance.
The Iso-DAM8A module contains an input DC oset adjustment, switch-selectable
gain, switch-selectable high pass and low pass lters, a line frequency “notch lter”
(which can be set to 50 or 60 Hz), and an output DC position adjustment.
The Iso-DAM8 chassis can be ordered for either 110-120VAC or 220-240VAC
operation. The chassis can accommodate up to eight Iso-DAM8A bioampliers. A
separate BNC connector is provided for the output of each channel, and all channel
outputs are available at a common DB-25 connector.
Notes and Warnings
CAUTION: The inputs to the Iso-DAM8A and the headstage can be damaged
by electrostatic discharge. We recommend that you momentarily touch the
Iso-DAM8A chassis or any grounded metal object before connecting wire or
electrodes to the inputs.
Unpacking
Upon receipt of this instrument, make a thorough inspection of the contents and
check for possible damage. Missing cartons or obvious damage to cartons should be
noted on the delivery receipt before signing. Concealed damage should be reported
at once to the carrier and an inspection requested. Please read the section entitled
“Claims and Returns” on page 15 of this manual. Please contact WPI Customer
Returns: Do not return any goods to WPI without obtaining prior approval (RMA
# required) and instructions from WPI’s Returns Department. Goods returned
(unauthorized) by collect freight may be refused. If a return shipment is necessary,
use the original container, if possible. If the original container is not available, use a
suitable substitute that is rigid and of adequate size. Wrap the instrument in paper or
8 World Precision Instruments
plastic surrounded with at least 100mm (four inches) of shock absorbing material. For
further details, please read the section entitled “Claims and Returns” on page 15 of
this manual.
Instrument Description
Noise and Interference
Electrical noise and interference originating from the current and voltage in the power
mains and room lighting power is a primary source of concern for low level bioelectric
recording. Every high amplication preamplier is subject to this handicap, particularly
when using microelectrodes. We recommend that all input leads be shielded and
the preparation connected to earth (ground). Often, it will be necessary to enclose
the preparation and electrode lead wires in a Faraday cage or shield to reduce
mains induction to suciently low levels. It may be benecial to extinguish overhead
uorescent lighting, as well. Use of the optional headstage preamplier can vastly improve
frequency response and reduce noise pickup when high-impedance electrodes are used!
Input Connection
The input connector of the Iso-DAM8A module is a 8-pin DIN connector. The pin
designations are shown in Fig. 5 and the function of each pin is shown in the following table.
Fig. 5—Iso-DAM8A input connections are labeled.
PIN FUNCTION
1 Output from remote headstage.
2** Isolated Ground
3 Reference Connection (See instructions)
4 Direct Input (+)
5 Direct Input (–)
6* Headstage Power (+10VDC)
7* Headstage Power (–10VDC)
8 No connection
*Reserved for headstage use only. Do not use to power other devices.
**Must be used to reference + input and – input.
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Input Cable
For convenience of connection to signal sources, each Iso-DAM8A module is supplied
with a 5-foot length of shielded input cable. One end is terminated in a DIN plug which
mates with the module. The other end has unterminated tinned leads. The wires are
color-coded as shown below:
Red + Input
Black – Input
White Isolated Ground””
Source Select Switch
The Source Select Switch sets the unit to operate either in the Internal Amplier (direct
input mode) or the External Probe mode. When set to the Internal Amplier (INT),
electrodes or other signal sources are connected directly to the INPUT connector.
When set to the PROBE position, the unit works with the optional headstage. A center
GND position disconnects all inputs to permit you to establish a DC baseline with
the POSITION control. Note that in this position, the DC OFFSET and BAL (balance)
adjustments have no eect.
Balance Adjustment
The DC balance potentiometer let you adjust the Gain switch position stability. This
potentiometer is accessible through a small screwdriver hole on the front panel.
To adjust the DC balance, connect the “+” and “-” inputs of the input connector, or
the headstage, if used, to Isolated Ground. Set the GAIN switch to 10. Using an
oscilloscope or recorder connected to the Output connector, adjust the POSITION
control so that the output trace on the recorder or oscilloscope is near the zero volt
level. Rotate the GAIN selector switch from x10 to x10000. If the baseline moves,
readjust the DC Balance potentiometer at the x10000 setting with a small screwdriver
until the baseline returns its prior setting. The baseline should not deect appreciably
when the GAIN switch is reduced to lower values. The baseline should remain
essentially stable (with input grounded) as the Gain switch is rotated.
Output
The maximum signal output from any preamplier channel is ±10V. All preamplier
channels have individual coaxial (BNC) connectors on the rear panel of the instrument.
Channel numbers start with #1 on the left hand side (front view). Channel outputs are
also available on a 25-pin connector for use with data acquisition systems.
10 World Precision Instruments
Pin 13 Pin 1
Pins 14 ~ 25
(bottom row)
NOT USED
Fig. 6—The 25-pin connector is used with data acquisition systems.
Filters
Iso-DAM8A provides selected ltering at both the high and low ends of its frequency
spectrum. The Low Filter settings are DC, 0.1, 1, 10 and 300Hz. The High Filter settings
are 100, 500Hz, 1kHz, 3kHz, and 10kHz. Typical settings recommended for ECG and
EEG would be Low Filter at 0.1Hz and the High Filter at 0.1kHz (100Hz).
DC Oset
When operating the Iso-DAM8A as a DC amplier, you may require a DC oset
potential to compensate any existing DC voltage from the recording site. The DC
Oset knob can provide 0 to >100mV DC of either polarity to reduce (null) the net
input signal to zero volts. This becomes increasingly necessary if high gains are to be
used with DC amplication. The toggle switch below the DC Oset knob selects the
polarity of the oset voltage. If oset adjustment is not required, the toggle switch is
kept in the O position.
Single Channel Installation
1. Remove two screws on the right and left sides of the instrument enclosure,
respectively. Then remove eight screws on the bottom of the enclosure.
2. Slide the internal chassis out of the enclosure.
3. Remove the two screws holding the blank panel where the new channel is to be
installed.
4. Plug the connector of this channel into the new module, and secure the channel
in position with two screws.
5. Slide the chassis into the enclosure and reinstall all the screws.
Operating Instructions
The connection to and from the amplier and the settings of the controls will vary
greatly from one application to another. The following guidelines may be helpful in
establishing initial operating conditions.
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Input Connections
CAUTION: The inputs to the Iso-DAM8A and the headstage can be damaged
by electrostatic discharge. We recommend that you momentarily touch the
Iso-DAM8A chassis or any grounded metal object before connecting wire or
electrodes to the inputs.
It is very important to minimize input lead length, and use of shielded cable is
recommended for any leads over 2 or 3 inches (except grounding leads). Both the
inverting and non-inverting inputs must be connected. A “oating” (non-connected)
input will cause amplier saturation.
DAM50, DAM60, DAM70
Micromanipulator
#5489 Probe
#2033 Adapter
#5469 Metal
Microelectrode
Adapter
Metal Microelectrode
(i.e., TM33B01)
EP2
Ag/AgCl Half Cell
Prep
AB
Central Ground
#3294 Grounding Clip
Fig. 7—A typical single-ended conguration is shown here.
The Iso-DAM8A inputs can be connected in either dierential or single-ended
modes. Dierential connection can reduce noise pickup, and is usually preferable to
single-ended. Fig. 7 shows a typical single-ended conguration. The optional remote
headstage is shown in these examples.
The two inputs on the headstage are electrically identical, except that positive-going
signals applied to the RED non-inverting input produce a positive-going output from
the Iso-DAM8A, whereas a positive-going signal applied to the BLACK inverting input
produces a negative-going output. The same holds true for the non-inverting “+” input
and inverting “–” input on the INPUT connector. Reversing the connections from that
shown simply results in an inverted signal.
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Output Connections
The output from each Iso-DAM8A module is available on the rear panel from a
standard BNC connector or all channels are available at the 25-pin connector. See
Fig. 6 for pin designations. The Iso-DAM8A output is suitable for application to any
recording or data acquisition device.
Grounding
Proper grounding is critical to successful biological signal monitoring. The optimum
grounding conguration is the “single-point ground,” in which each component of a
monitoring setup is connected to a single point which is connected to earth or mains
ground. This grounding conguration is used in Fig. 6 and Fig. 7.
Shielding
The isolation feature of the Iso-DAM8A minimizes, but cannot eliminate, noise pickup
from electric distribution lines, uorescent lights, computers, motors, radio frequency
transmitters, microwave ovens, etc. Use of shielded wires for input connection is
necessary if the subject is located more than a few inches from the amplier inputs.
Even the use of shielded wires and proper grounding may be insucient in a high
electrical noise environment, particularly if high impedance electrodes are used, if the
signal level is low (less than 100mV or so), or if high frequency response is required. In
these situations, the use of a metal shield, known as a Faraday cage, which encloses
the subject and the headstage may be necessary.
Idle Settings
If you are not certain what settings are required, the following settings are a good
starting point:
PROBE SELECT: GND
LOW FILTER: DC
DC OFFSET: OFF
GAIN: 10
HIGH FILTER: 10 kHZ
NOTCH FILTER: OFF
POSITION: Mid-range
POWER: OFF
Control Adjustment
After connecting inputs and outputs, the amplier can be turned on. The POSITION
control may be used to establish a baseline setting on the recording device. It is
normal to set this control so that the recording device indicates zero when the PROBE
SELECT is in the GND position. The PROBE SELECT switch should be set appropriately
for the setup.
• If the headstage is used, set the switch to PROBE.
• If direct connection is made to the Iso-DAM8A input, set the switch to INT.
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The GAIN control should be set so that the desired signal produces a signicant
(>30% of full scale or so) on the recording device. If the recording device has a gain or
sensitivity control, it is usually preferable to set the recording device to a low gain and
the Iso-DAM8A to a high gain.
The HIGH and LOW lters should be used to reject noise outside the signal frequency
range. If the signal is transient in nature and DC response is not required, the LOW
lter should be set to the highest setting that does not distort the signal. The HIGH
lter should be set to the lowest setting that does not distort the signal.
If line noise is a problem, the NOTCH FILTER may be set to 50 or 60Hz, as appropriate
for the power system. Use of the notch lter can severely distort some signals.
If a large DC oset is present in the setup, the DC OFFSET control can be used to
cancel it. The setting of this control can be quite sensitive, especially at high gain
settings.
Specications
This unit conforms to the following specications:
Voltage Gain.........................................................................................x10, x100, x1000, x10,000
Input Impedance to Gnd, each input ............................... > 1012Ω DC, 5 picofarads (typical)
Input R, Between Inputs........................................................ >1012Ω DC, 3 picofarads (typical)
Amp Noise, Input Shorted......................................................................< 0.2µV rms (1-100Hz),
..........................................................................................................................< 1µV rms (1-10kHz)
Bandwidth ..................................................................................................................... DC to 10kHz
High Filter (Low Pass)......................................................................................0.1, 0.5, 1, 3, 10kHz
Low Filter (High Pass)...........................................................................................0.1, 1, 10, 300Hz
Input Oset Voltage Adjust. ................................................................................................± 1VDC
Common Mode Rejection ........................................ > 100dB @ 50/60Hz with <10Ω source
.....................................................................................70dB typical with balanced 1MΩ source
Notch Filter Settings..............................................................................................50Hz, 60HZ, O
Line Noise Rejection .............................................................................................................. >40dB
Output Voltage Swing........................................................................................... ±10V Maximum
Output Resistance.................................................................................................................... 200Ω
Output Position Adjustment................................................................................................±1VDC
Power Source ...........................................Power Adapter 110-120V/60Hz or 220-240/50Hz
Enclosure Dimensions..........................................................6.8 x 17 x 11.2˝ (17 x 43 x 28cm)
Shipping Weight ...........................................................................................10–21 lb. (4.5–9.5kg)
14 World Precision Instruments
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* Electrodes, batteries and other consumable parts are warranted for 30 days only from the date on which
the customer receives these items.
WARRANTY
WPI (World Precision Instruments) warrants to the original purchaser that this equipment, including
its components and parts, shall be free from defects in material and workmanship for a period of
one year* from the date of receipt. WPI’s obligation under this warranty shall be limited to repair or
replacement, at WPI’s option, of the equipment or defective components or parts upon receipt thereof
f.o.b. WPI, Sarasota, Florida U.S.A. Return of a repaired instrument shall be f.o.b. Sarasota.
The above warranty is contingent upon normal usage and does not cover products which have been
modied without WPI’s approval or which have been subjected to unusual physical or electrical stress
or on which the original identication marks have been removed or altered. The above warranty will not
apply if adjustment, repair or parts replacement is required because of accident, neglect, misuse, failure
of electric power, air conditioning, humidity control, or causes other than normal and ordinary usage.
To the extent that any of its equipment is furnished by a manufacturer other than WPI, the foregoing
warranty shall be applicable only to the extent of the warranty furnished by such other manufacturer.
This warranty will not apply to appearance terms, such as knobs, handles, dials or the like.
WPI makes no warranty of any kind, express or implied or statutory, including without limitation any
warranties of merchantability and/or tness for a particular purpose. WPI shall not be liable for any
damages, whether direct, indirect, special or consequential arising from a failure of this product to
operate in the manner desired by the user. WPI shall not be liable for any damage to data or property
that may be caused directly or indirectly by use of this product.
Claims and Returns
Inspect all shipments upon receipt. Missing cartons or obvious damage to cartons should be noted on
the delivery receipt before signing. Concealed loss or damage should be reported at once to the carrier
and an inspection requested. All claims for shortage or damage must be made within ten (10) days
after receipt of shipment. Claims for lost shipments must be made within thirty (30) days of receipt of
invoice or other notication of shipment. Please save damaged or pilfered cartons until claim is settled.
In some instances, photographic documentation may be required. Some items are time-sensitive; WPI
assumes no extended warranty or any liability for use beyond the date specied on the container
Do not return any goods to us without obtaining prior approval and instructions from our Returns
Department. Goods returned (unauthorized) by collect freight may be refused. Goods accepted for
restocking will be exchanged or credited to your WPI account. Goods returned which were ordered
by customers in error are subject to a 25% restocking charge. Equipment which was built as a special
order cannot be returned.
Repairs
Contact our Customer Service Department for assistance in the repair of apparatus. Do not return
goods until instructions have been received. Returned items must be securely packed to prevent
further damage in transit. The Customer is responsible for paying shipping expenses, including
adequate insurance on all items returned for repairs. Identication of the item(s) by model number,
name, as well as complete description of the diculties experienced should be written on the repair
purchase order and on a tag attached to the item.
USA
175 Sarasota Center Blvd., Sarasota FL 34240-9258
UK
1 Hunting Gate, Hitchin, Hertfordshire SG4 0TJ
Germany
Pngstweide 16, D-61169 Friedberg (Hessen), Germany
China & Hong Kong
WPI Shanghai Trading Co., Ltd.
Rm 27A, Liangfeng Building, No 8, Dongfang Road, Pudong New District, Shanghai, PR China
Brazil
Av. Conselheiro Nébias, 756 sala 2611, Santos-CEP: 11045-002, São Paulo Brazil Tel: (013) 406-
Internet
www.wpiinc.com • www.wpi-europe.com • www.wpiinc.net • www.wpibrasil.com.br
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