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DYNAMIC STRAIN AMPLIFIER
Thank you for purchasing KYOWA's product DPM-900/950 series Dynamic
Strain Amplifier.
Read this Instruction Manual carefully in order to make full use of the high
performance capabilities of the product.
Do not use the product in methods other than described in this Manual.
Copyright © KYOWA ELECTRONIC INSTRUMENTS CO., LTD. All rights reserved.
This Instruction Manual may not be copied or reproduced, in whole or part, without consent of KYOWA.
Generally, company names and trade names described in this Instruction Manual are trademarks or
registered trademarks of the companies.
The contents of the Instruction Manual are subjected to change without prior notice.
For the latest content, please refer to our website.
DPM-900/950 SERIES
INSTRUCTION MANUAL
IM-A-857F January 2018
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Table of Contents
Troubleshooting
Related Manuals for KYOWA DPM-913
Summarization of Contents
1. PRODUCT OUTLINE
1-1 PRODUCT OUTLINE
Details the DPM-900/950 series strain amplifier with AC excitation.
1-2 SYSTEM CONFIGURATION
Illustrates the general system setup for DPM-900/950 series measurements.
2. PARTS AND FUNCTIONS
2-1 FRONT PANEL
Details the components and functions of the DPM-900/950 series front panel.
2-2 REAR PANEL
Describes the connectors and switches on the rear panel of the DPM-900/950 series.
3. PREPARATION
3-1 HOW TO SET UP INPUT/OUTPUT INSTRUMENTS
Guides setting up input and output instruments for the DPM-900/950 series.
3-2 CONNECTION OF POWER
Explains how to connect AC and DC power supplies to the DPM-900/950 series.
3-3 INITIAL SETTING
Details the initial configuration steps before operating the DPM-900/950 series.
4. BASIC OPERATION
4-1 CONNECTION OF INPUT
Explains how to connect strain gages and transducers to the DPM-900/950 series.
4-2 CONNECTION OF OUTPUT
Details how to connect external instruments to the OUTPUT A and OUTPUT B terminals.
4-3 TURNING ON AND OFF THE POWER
Provides instructions for safely powering the DPM-900/950 series ON and OFF.
4-4 SELECTING MODE
Explains how to select operating modes like Normal, TEDS, and ACTL LOAD.
4-5 BASIC BALANCING
Details the electronic balancing procedure for the DPM-900/950 series.
4-6-1 Setting an Basic Internal Gain
Describes setting the internal gain for accurate strain measurement using the CAL switch.
4-6-4 Zero Point Fine Adjustment
Explains how to fine-tune the zero point of the output signals.
4-6-5 Sensitivity Fine Adjustment
Details methods for fine-tuning the internal gain (sensitivity) of the amplifier.
5. FUNCTIONS
5-1 INPUT
Describes the input capabilities and compatible sensors for the DPM-900/950 series.
5-2 OUTPUT
Details the characteristics of the independent OUTPUT A and OUTPUT B systems.
5-3 PREHEATING
Explains the importance of preheating for stable measurement after power ON.
5-4 BRIDGE CHECK
Describes the function for checking cable breaking in the input system.
5-5 BALANCING
Explains the procedure for balancing resistive and capacitive unbalance components.
5-6 MOVING ZERO POINT
Describes how to remove or move the zero point of the output signals.
5-7 INTERNAL GAIN
Details the three methods for setting the internal gain: CAL, TEDS, and ACTL LOAD.
5-8 LOW-PASS FILTER
Explains the Butterworth type low-pass filter and its functions.
5-9 CALIBRATION SIGNAL
Describes the use of calibration signals for measuring strain.
5-10 KEY-LOCK
Explains the key-lock function to prevent accidental parameter changes.
5-11 OSC SYNCHRONIZATION
Details OSC synchronization for simultaneous measurement with multiple units.
5-12 APPLICATION OF CENTRALIZED CONNECTOR
Describes the centralized connector on the rear panel for power and signal connections.
5-13 REMOTE CONTROL
Explains how to control functions remotely via external signals.
5-14 EXCITATION VOLTAGE
Explains how to select and set the excitation voltage (2 Vrms or 0.5 Vrms).
5-15 TPN/DLT MEASURING MODE
Details the TPN/DLT Measuring Mode for specific transducers.
6. OPTIONS
6-1 BRIDGE BOX
Describes bridge boxes for measuring strain with strain gages.
6-2 AMPLIFIER STAND FA-1B
Details the rubber stand for fixing a single unit of DPM-900/950.
6-3 EXTENSION CABLE N
Lists available extension cable models for remote connections.
6-4 NOISE FILTER F
Describes the noise filter for reducing external high-frequency noise.
6-5 EXCLUSIVE CARRYING CASE
Details exclusive carrying case models for multichannel measurements.
7. TROUBLE SHOOTING
7-1 DPM-900/950 SERIES CANNOT BE TURNED ON
Provides remedies for issues where the DPM-900/950 series does not power on.
7-2 INITIAL BALANCING IS IMPOSSIBLE
Offers solutions for when initial balancing fails or shows errors.
7-3 NO OUTPUT IS AVAILABLE
Troubleshooting steps for situations where no output signal is detected.
7-4 INSTABILITY OF THE ZERO POINT
Addresses causes and solutions for zero point instability in measurements.
7-5 LARGE NOISE
Explains sources of noise interference and methods to reduce it.
8. SPECIFICATIONS
8-1 SPECIFICATIONS
Presents detailed technical specifications for DPM-911/951, DPM-912/952, and DPM-913.
8-2 BLOCK DIAGRAM AND OPERATION PRINCIPLE
Explains the internal block diagram and operational principles of the DPM-900/950 series.
8-3 DIMENSIONAL DRAWING
Provides dimensional drawings and overall dimensions of the DPM-900/950 series.
9. APPENDIXES
9-1 BRIDGE CHECK FUNCTION AND RESULT INDICATION
Details error indications for wire-breaking during bridge check.
9-2 LOW-PASS FILTER CHARACTERISTIC
Shows the frequency characteristics of the low-pass filter.
9-3 HOW TO CALCULATE STRAINS
Describes methods for calculating strains and stress from waveforms.
9-4 TROUBLE SHOOTING
Lists error indications and their remedies for the DPM-900/950 series.
9-5 E TERMINAL OF INPUT CONNECTOR
Explains the E terminal connection for safety on input connectors.
9-6 INTERNAL GAIN AND INPUT STRAIN
Provides tables relating internal gain, input strain, and output voltage.
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