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Minebea DSA-631 Instruction Manual

Dynamic strain amplifier
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Dynamic Strain Amplifier
DSA-631
INSTRUCTION MANUAL
EN294-1320-E

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  • Page 1 Dynamic Strain Amplifier DSA-631 INSTRUCTION MANUAL EN294-1320-E...

  • Page 3: Introduction

    INTRODUCTION ▲ Before Using▼ We would like to express our thanks to you for your purchase of our product, dynamic strain amplifier DAS-631. Please read this manual carefully before operating this instrument. This manual provides the information necessary to operate the instrument safely. This manual covers basic functions and operations of the DAS-631 amplifiers and handling precautions.

  • Page 4: Precautions

    PRECAUTIONS To avoid accidents, read this manual carefully before use. Observe the following warning and cautions when using amplifiers. The warranty does not apply any damage caused by the use against instructions, warnings, and cautions. To safely use the amplifiers, the following statements are used in this manual to call the readers' attention.
  • Page 5 WARNING POWER SUPPLY ● Make sure that the power supply is within the rating. If any voltage exceeding the rated voltage was supplied, there would be risk of damage to this amplifier, or even a fire. Also, in order to prevent electric shock and hazards such as a fire, be sure to use only the AC power cable and the adapter (3-prong/2-prong converter) supplied with this amplifier.
  • Page 6 CAUTION Caution in handling ● When using this amplifier, always follow the precautions below. 1) Limitation of operator Users who are not familiar with the operation of this recorder should avoid using it. 2) Use and storage environment The storage temperature and humidity of the input units is -20 to 70C and 10 to 90%, respectively.

  • Page 7: Caution In Handling

    6) This product uses a flash memory for saving setup values. Replacement of battery is not needed accordingly. 7) As the DSA-631 have AC signal bridge voltage. Amplifier unit whose bridge voltage frequency differs cannot be used in the same case. In addition, when using several units closely, always make synchronization.

  • Page 8: Warranty

    WARRANTY We ship our products after conducting quality control, which covers from design to manufacturing. It is, however, possible that failures may occur in the products. If the product does not operate correctly, please make a check of the power supply, cable connections, or other conditions before returning this product to us.

  • Page 9: Table Of Contents

    TABLE OF CONTENTS ..................................I INTRODUCTION ................................... II PRECAUTIONS ................................V CAUTION IN HANDLING ....................................VI WARRANTY ................................VI LIMITED WARRANTY ................................VII TABLE OF CONTENTS 1. OVERVIEW ..................................１ 1-1. F .................................... １ EATURES 1-2. P ................................. １ RODUCT STRUCTURE 1-3.
  • Page 10 4-5. S ................................ 35 PECIAL APPLICATION 5. OPERATION THEORY ............................... 36 5-1. F . 5-1) ....................36 LOW OF EASUREMENT IGNAL EFER TO FIG 6. OPTIONAL FUNCTION ..............................37 6-1. C (DSA631-P07 4 ~ 20 ) ..................37 URRENT UTPUT OUTPUT UNIT 6-2.

  • Page 11: Overview

    1. Overview 1-1. Features DSA-631 is Dynamic Strain Amplifier that features new function such as cable length compensation and bridge checking, realizing higher-accuracy and higher-quality measurement and a reduction in measurement preparation time. This model includes an LED monitor and the auto-balancing function, thereby improving their operability and permits strain gage type transducers to perform physical value measurement.

  • Page 12: Block Diagram Of Measurement

    (DC ~ 120 Hz) Waveform Rec. in Dynamic strain Thermal Dot High freq. range amplifier Recorder （DC ~ 20kHz） (AC bridge type) DSA-631 Waveform Rec. in high freq. range Load （DC ~ 100kHz） Pressure Displacement Sensor Data Analysis and Acceleration...

  • Page 13: Features Of Dynamic Strain Amplifier

    This feature is advantageous in measurement using strain a gage. Table 1-3 Recommended Sensors and Feature AC Strain Amplifier (Isolated) Type DSA-631 Voltage Sensitivity ±10 V output at 200 x 10 strain Non-linearity 0.1 % FS...

  • Page 14: Names And Functions Of Parts

    2. NAMES and FUNCTIONS of PARTS ① ② ③ ④ ⑥ ⑤ ⑦ ⑧ ⑩ ⑨ ⑪ ⑫ ⑬ ⑭ ⑱ ⑮ ⑯ ⑰ ⑲ Fig. 2-1 Face of panel Fig. 2-2 Back face 2-1. Names and Functions of Parts on Front Panel (see 2-1.) Name Function Model...
  • Page 15 Name Function Bridge check / Cable length Pressing the knob performs bridge check and cable ④ compensation / Auto-balance knob length compensation, enabling automatic balancing (BAL) of resistors and capacitance. For details, see paragraph 9 Indication upon Balancing. * See pages 16 to 18 for bridge check The result of bridge check is indicated on digital and cable length compensation.
  • Page 16 Number Name Function Measuring range fine tuning knob Fine tuning is made with the knob. Turning the ⑨ (FINE) knob clockwise narrows measuring range (i.e. increasing sensitivity) and widens the range (i.e. decreasing sensitivity). As measuring range fine tuning knob (9) and measuring range selection functions together, the range automatically shift when signals exceeds the measuring range.
  • Page 17 Number Name Function ON/OFF for high-pass filter Pressing the knob allows the high-pass filter to ⑯ (FILTER) switch between ON and OFF. High-pass filter LED (15) comes on for ON and it comes off for OFF. Filter type : 2-pole Butterworth filter Cut-off frequency : 0.5 Hz Low pass filter setting knob This knob is used to set the low-pass filter.

  • Page 18: How To Set Calibration Value (Cal)

    2-2. How to Set Calibration Value (CAL) The indicated value is calculated value based on input. The value can be set from 1 με to. 9999 με by a step of 1 με(=10-6). Values should be set for each digit (Figure 2-3). Pressing calibration value setting knob (12) (Figure 2-4) illuminates the fourth digit of calibration value LED (13).

  • Page 19: Indication Upon Balancing

    2-3. Indication upon Balancing Pressing BAL knob (4) executes bridge check and cable length compensation, thus automatically realizing both resistance balancing and capacitance balancing. While the bridge check and cable length compensation functions are effective (ON). the following indications appear. If there is bridge cable disconnection or short, the problematic location is indicated repeatedly on digital monitor (3).

  • Page 20: Names And Functions Of Parts On Rear Panel (See Fig.2-2)

    ① ② ③ ⑥ ④ ⑤ ⑦ ⑧ ⑩ ⑨ ⑪ ⑫ ⑬ ⑱ ⑭ ⑮ ⑯ ⑲ ⑰ Fi-1 Face of panel Fig. 2-2 Back face 2-4. Names and Functions of parts on Rear Panel (See Fig.2-2) Number Name Function Input connector (INPUT) The bridge box or connector or a transducer is...
  • Page 21 Number Name Function Output connector 1 (OUTPUT1) The output voltage and current are±10 V and ±5 mA, respectively. This connector can be connected to a recorder (e.g. Thermal-dot recorder or data acquisition devices ) or A/D converter, which accept voltage signals. Output connector 2 (OUTPUT2) The output voltage and current are±10 V and ±5 mA, respectively.

  • Page 22: Before Measuring

    (3) Connect the bridge box or a transducer to the input connector 1 on the rear panel. For connection information, see Cautions before Measuring on page-24. Since the DSA-631 automatically adjusts the voltage drop generated between the bridge and the DSA-631 amplifier through the cable length compensation function, high accuracy measurement is possible. For more information on this adjustment function, see page 17 to 18.

  • Page 23: Operation Before Measuring

    (12) first, and then start measuring. The measuring range can be checked after applying a calibration value using the calibration value application switch (14). The measuring ranges for DSA-631 amplifiers are described in Measuring Ranges for DSA-631 on page 14.
  • Page 24 ±40 000 ~ ±80 000 ±10 000 ~ ±20 000 １０k 1 ~ 2.5 Continuous Variable ±80 000 ~ ±200 000 ±20 000 ~ ±50 000 ２０K Table 3-1 Measurement range of DSA-631 * Sensitivity fine adjusting knob (9) has automatic range switching function.

  • Page 25: Bridge Check Function

    3-3. Bridge Check Function 3-3-5. Overview The bridge check funtion of the DAS-631 amplifiers can detect a bridge cable disconnection, short, orcable disconnection. Since disconnected portions can easily be found, testing personnel can reduce the measurement preparation time or prepare countermeasures against cable disconnections. The bridge check function can be set to on or off using the dip switch on the bottom face of the DAS-631 amplifier.
  • Page 26 3-3-6. Error Indication List upon Cable Disconnection and Short (1) Error indication in the case of disconnection Disconnection on cable Disconnection on bridge circuit Indication (Digital Monitor (3)) Good ○ ○ ○ ○ ○ ○ ○ ○ E-ab × ○ ○...

  • Page 27: Cable Length Compensation Function

    For the rate of the bridge voltage drop, refer to table 3-4 below. The DSA-631 employs a unique automatic compensation circuit in lieu of the conventional techniques, thereby enabling supplying the bridge power that reflects conductor resistance. Since high-accuracy strain measurement is possible, there are reductions in measurement time and measurement time.
  • Page 28 ∙ long, the cable length compensation function to correct the voltage drop of the excitation from DSA-631 is equipped as a standard. As for this function, the transducers and the bridge box is required to be composed of the ∙...

  • Page 29: How To Switch Special Function Setting

    3-5. How to Switch Special Function Setting By switching dip switches on the bottom face of the DAS-631, settings for special functions can be made. Front panel  ON/OFF for cable length compensation Rear Panel  ON/OFF for bridge check function ...

  • Page 30: Case

    It is impossible to share a common case or synchronize between cases that have amplifiers installed with different bridge power frequencies. Take notice that the bridge power frequency of DSA-631 is 5 kHz.
  • Page 31 Note that only amplifier units with the same bridge power frequency can be installed in a case. It is impossible to share a common case or synchronize between cases that have amplifiers installed with different bridge power frequencies. Take notice that the bridge power frequency of Dsa-631 is 5 kHz. CAUTION Do not set two or more units to INT.
  • Page 32 (4) Synchronization of bridge power The master unit (INT) provides slave units (EXT) with the synchronization ssignal for bridge power. Settings such as bridge voltage, calibration value, filter, measurement range, bridge check ON/OFF,and cable length compensation ON/OFF are effective in each amplifier unit. (5) Balancing for all units Hold down the switch for BAL for all units (1).
  • Page 33 (8) Remote box The same operation are available when a small control box like in Fig. 3-10 is used. The BAL switch should include a locking mechanism in order to avoid erroneous operations. Use a momentary switch accordingly. AUTO CAL ⑤GND Case / Interface Connector Pin Alignment ②-ＣＡＬ...
  • Page 34 3-6-3. Heat Release for Case (1) Using standalone rack mounting case CAUTION As a rack mounting case does not have legs, avoid placing it on a desk or floor. Otherwise, heat cannot be released, resulting in damages to amplifiers. It should be properly mounted. Rack-mounting case 20 mm and over Floor or Desk...

  • Page 35: Measurement

    4. MEASUREMENT 4-1. Cautions before Measureing (Refer to Table 4-1) Before starting measurement, check the following points; Items Cautions Reasons Instalation environment for strain gage and bridge box. The joints must be solered, and the connections must be Prevents poor connections, noise, and properly connected.

  • Page 36: Input Connection

    The power supply may be disabled, and heat will be generated in the circuitry Countermeasures against noise The input, including the shield, of the DSA-631 is isolated from the output using a transformer.. Use shielded wires as leads connecting strain gage and connect the metal shields of ∙...
  • Page 37 Bridge configuration Bridge Box Wiring Example Remarks and circuit Method Suited for where simple ∙ tension, compression, or bending force is applied Output Suited for where changes in ∙ ambient temperature are small. Calculated using the Bridge Voltage ∙ One gage configuration calibration value as it is.
  • Page 38 Bridge configuration Bridge Box Wiring Example Remarks and circuit Method Dtects tension and ∙ compression strain Eliminates bending strain. ∙ Output Effects of changes in ∙ temperature are doubled. Strain gage lead wires are ∙ temperature compensated. Calculated using calibration ∙...
  • Page 39 4-2-2. Bridge box The bridge box cpmprises a terminal box, a cable and a connector. The terminal box has terminals for connecting stran gage and contains 3 pieces of high precision resisters (e.g. 120Ω for FA410-072). The bridge circuit is formed by connecting one strain gage or more to the terminals. (1) Instrallation ...
  • Page 40 4-2-3. Measurement with Transducer In most strain gage based transducers, the physical amount to be measured is applied to an elastic part, and the resulting deformation is converted into an electrical amount. This elastic part is called the sensing part. The sensing part is made of material which exhibits a higher limit of proportionally and less creep and hysteresis.

  • Page 41: Connection Of Output To Load

    LED located on the right or left side of the reading blinks for a certain period of time. An excessive level up to a frequency of approximately 1 kHz can be checked on the monitoring meter. Approx. 10.5 V 10 V Data recorder DSA-631 Voltage dividing circuit Ｒ Ｌ...

  • Page 42: How To Read Measured Values

    (2) Where a voltage divider is required If the input level of a data recorder is ±1 V, a voltage divider is required. Pay due care to the impedance. In general, since the output impedance increases as the frequency band becomes higher, it is expressed as R (Ω) + L (μH)
  • Page 43 (2) Measurement with various types of transducers This calibration voltage value is linked with the bridge supply voltage, and the amount of calibration can always be applied with any panel-indicated value (1 x 10 strain ~ 9 999 x 10 strain).
  • Page 44 AC voltage Measurement x Calibration value on display 1 – 0.058 Bridge box Fig. 4-7 Voltage measurement on bridge box Such measurement and adjustment are not needed in DSA-631 amplifier thanks to cable length compensation (refer to page 17 to 18.)

  • Page 45: Special Application

    4-5. Special application This section describes how to use the amplifier unit with a slip ring or differential transformer. 4-5-1. Slip Ring (1) When using four slip rings on each lead of the bridge. Slip ring Fig. 4-8 Do not connect terminal E to any of the A, B, C or D terminals. (2) When conducting multi-channel measurement using a common bridge power voltage.

  • Page 46: Operation Theory

    5. Operation Theory 5-1. Flow of Measurement Signal (Refer to fig. 5-1) Phase Input Signal Isolation Detection Selection HEAD RANGE RANGE Carrier Circuit OUTPUT1 Circuit FINE Filter ＨＰＦ OUTPUT2 ＬＰＦ Bridge Check Cable Analog to Length Compensation Digital Level Meter Converter (17 dot LED) Calibration...

  • Page 47: Optional Function

    6. Optional Function 6-1. Current Output (DSA631-P07 4 ~ 20mA output unit) Current output can be incorporated into the amplifier unit as an optional function. The current output is made in a manner that allows the voltage output to OUTPUT2 to be converted into the current output.
  • Page 48 6-2-3. Connecting Grounding Wire When an amplifier unit is connected to a case, the protective grounding terminal, case protective grounding terminal of batch powr supply connector are connected and have the same potential. WARNING The grounding wire should have AWG16 wire material and connected with a screw. Always connect the grounding wire to gound.

  • Page 49: Maintenance

    7. Maintenance 7-1. Items to be Checked. We ship our products after conducting quality control, which covers from design to manufacturing. It is, however, possible that failures may occur in the products due to natural degradation, components defects, or wire disconnection. If a failure occurs, it is necessary to find the cause.
  • Page 50 Symptom 2 No signal is output Isn’t the measuring range set to OFF ? (Doesn’t OFF illuminate on measuring LED (11) ?) Yes : Set measuring range to 20k to 200 using measuring range selection Input a calibration value using calibration value input switch (14). Is the level of level meter move ? Isn’t output cable disconnected ? Is the output cable of output connector...

  • Page 51: How To Replace Fuse

    7-2. How to replace Fuse Follow the following fuse replacement procedure. (1) Turn the power switch to off, and then disconnect input and output cables from the amplifier unit. (2) As shown in Fig. 7-2, place the amplifier unit so that the front of the unit to be left side, bottom of the unit to be in the fron, and the rear of the unit to be right side.

  • Page 52: Changing Ac Power Supply Voltage

    7-3. Changing AC power supply voltage Follow the steps below to switch the AC power supply voltage (1) Trun off and disconnect the power supply cord and input / output cable from the amplifier unit. (2) Remove the cover using two screws (M3) on the top face (Fig. 7-6) (3) The AC power supply selection switch is positioned at the location shown in Fig.

  • Page 53: Specifications

    ADJ. Accuracy : Within ±0.05 % rdg±1 count. Displaying location of decimal point can be changed by using the bottom setting SW. Key lock function Turning the key lock ON/OFF by pressing the key lock button approx. 1 s. (Except CAL switch and BV selection switch.) Table 8-1 Specification list for DSA-631(1)
  • Page 54 Automatic adjusting of bridge power voltage drop according to a change of adjusting function cable length up to bridge circuit (bridge impedance of 120 ohm or larger) Functin ON / OFF is available by using the bottom setting SW. Table 8-1 Specification list for DSA-631(2) Item Details Operating temp.

  • Page 55: References

    9. REFERENCES 9-1. Frequency characteristics and Phase Property Frequency characteristics Amplitude（ｄB) W/B(2 kHz) 500Hz 300Hz 100Hz 500 Hz 30Hz 10Hz 30Hz 100 Hz 300 Hz W/B（2ｋHz） 10Hz Frequency （Hz) 100 0 1000 0 Phase Properties Phase Delay (Degree) -100 500Hz -200 300Hz 30Hz...

  • Page 56: Cable List

    AC power cable Length : 2.5m for unit and case Conversion plug for (AC 100V) 2 polarity and 3 Parts No. 47326 polarity (with KPR-13) For the connection with DSA-631 unit and case. Attached as a standard. Tables 9-1. Cable List (1)
  • Page 57 Cables Shapes Pin Allocation Remarks AC power cable Length : 3.5m For main unit Cable end is separated. ＊When this unit is （200V） Parts No. 0311-5112 used in apan-domestic, the voltage that exceeds the power supply voltage of 125 V cannot be supplied from the limitation of "Electric safety low".

  • Page 58: Outline Dimensions

    9-3. Outline dimensions 9-3-1. Single unit Unit : mm...
  • Page 59 9-3-2. Panel cut size Square hole Unit : mm...
  • Page 60 9-3-3. Bench top case Unit : mm Description Type Ａ 4CH bench top case AS16-104 262.6 6CH bench top case AS16-105 362.6 8CH bench top case AS16-106 462.6...
  • Page 61 9-3-4. Rack mount case Rail for rack Long hole Unit : mm...
  • Page 62 9-3-5. Bridge box（FA410-072 model） Unit : mm...
  • Page 64 1-1-1, Katase, Fujisawa-shi, Kanagawa-ken, 251-8531 Japan Tel: +81-466-23-2681 Fax: +81-466-22-7191 Sensing Device Business Unit FUJISAWA PLANT 1-1-1, Katase, Fujisawa-shi, Kanagawa-ken, 251-8531 Japan Tel: +81-466-22-7151 Fax: +81-466-22-1701 KARUIZAWA PLANT 4106-73 Miyota, Miyota-machi, Kitasaku gun, Nagano-ken 389-0293 Japan Tel: +81-267-31-1309 Fax: +81-267-31-1353 HOMEPAGE ADDRESS http://www.minebea-mcd.com...

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