ISDB www.wpiinc.com ISO-DAM 8A and BRIDGE8 INSTRUCTION MANUAL Serial No.
BRIDGE8 ISDB CONTENTS BRIDGE8................................................................................................................................................. 1 Introduction..................................................................................................................................... 1 Unpacking................................................................................................................................... 2 Instrument Description.....................
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BRIDGE8 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.
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 differential amplifier with selectable voltage amplification and variable position adjustment control. Each module includes a low pass filter 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.
BRIDGE8 + O UT -5V 2 4 +5V 1 NC 5 - O UT 3 8 NC 7 6 G ND TRA NS DUCE R P L UG (S O L DE R S IDE) S HIE L D 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 Differential. Turn on the Power switch at the top of the panel.
Transducer Calibration Bridge-8 provides fixed and accurate decade amplification 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.
BRIDGE8 Voltage Offset Adjustment ............................................................. ± 50mV (low offset range),. ...............................................................................................................± 100mV (high offset range) Amplifier Output Voltage ............................................................................ ± 5.0V (10mA, max.) Transducer Excitation .....................................................................10V (± 5.0V) (100mA, max.
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. 1—Up to eight rackmountable ISO-DAM8A and Bridge8 modules can be combined in a single chassis.
ISO-DAM8A 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 differential and is isolated from the AC power system. For example, there is no electrical connection to the AC power circuit ground. Isolated pre-amplification has important advantages over non-isolated amplifiers: • There is no significant current can flow from the preamplifier input terminals to ground.
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 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.
ISO-DAM8A 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 Amplifier (direct input mode) or the External Probe mode.
Pin 13 Pin 1 Pins 14 ~ 25 (bottom row) NOT USED PIN 1 2 3 4 5 6 7 FUNCTION Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 PIN 8 9 10 11 12 13 FUNCTION Channel 8 Ground Ground Ground Ground Ground Fig. 3—The 25-pin connector is used with data acquisition systems. Filters Iso-DAM8A provides selected filtering at both the high and low ends of its frequency spectrum. The Low Filter settings are DC, 0.1, 1, 10 and 300Hz.
ISO-DAM8A Operating Instructions The connection to and from the amplifier 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. 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.
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. 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. 3 for pin designations.
ISO-DAM8A 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. The GAIN control should be set so that the desired signal produces a significant (>30% of full scale or so) on the recording device.
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ISO-DAM8A WARRANTY WPI (World Precision Instruments, Inc.) 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.
World Precision Instruments, Inc. USA International Trade Center, 175 Sarasota Center Blvd., Sarasota FL 34240-9258 Tel: 941-371-1003 • Fax: 941-377-5428 • E-mail: sales@wpiinc.com UK 1 Hunting Gate, Hitchin, Hertfordshire SG4 0TJ Tel: 44 (0)1462 424700 • Fax: 44 (0)1462 424701 • E-mail: wpiuk@wpi-europe.com Germany Zossener Str. 55, 10961 Berlin Tel: 030-6188845 • Fax: 030-6188670 • E-mail: wpide@wpi-europe.com China & Hong Kong WPI Shanghai Trading Co., Ltd. Rm 20a, No8 Dong Fang Rd.
