KYOWA DPM-900 Series User manual

IM-A-857F January 2018
DYNAMIC STRAIN AMPLIFIER
DPM-900/950 SERIES
INSTRUCTION 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.
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.


CONTENTS
STANDARD ACCESSORIES ........................................................................................................................ 1
SAFETY PRECAUTIONS ............................................................................................................................. 1
PRIOR TO USE........................................................................................................................................... 1
SAFETY SYMBOLS................................................................................................................................... 1
Informational Notes..................................................................................................................................... 4
Examples of Notations................................................................................................................................. 4
1. PRODUCT OUTLINE ................................................................................................................................ 5
1-1 PRODUCT OUTLINE.......................................................................................................................... 5
1-2 SYSTEM CONFIGURATION............................................................................................................. 6
2. PARTS AND FUNCTIONS......................................................................................................................... 7
2-1 FRONT PANEL..................................................................................................................................... 7
2-2 REAR PANEL ....................................................................................................................................... 9
3. PREPARATION ........................................................................................................................................ 10
3-1 HOW TO SET UP INPUT/OUTPUT INSTRUMENTS .................................................................. 10
3-1-1 Input Instrument.......................................................................................................................... 10
3-1-2 Output Instrument....................................................................................................................... 10
3-2 CONNECTION OF POWER............................................................................................................. 10
3-2-1 AC Power ...................................................................................................................................... 10
3-2-2 DC Power...................................................................................................................................... 10
3-2-3 Grounding......................................................................................................................................11
3-3 INITIAL SETTING .............................................................................................................................11
4. BASIC OPERATION................................................................................................................................ 12
4-1 CONNECTION OF INPUT ............................................................................................................... 12
4-2 CONNECTION OF OUTPUT ........................................................................................................... 13
4-3 TURNING ON AND OFF THE POWER ......................................................................................... 14
4-3-1 Turning ON the Power................................................................................................................. 14
4-3-2 Turning OFF the Power............................................................................................................... 14
4-4 SELECTING MODE .......................................................................................................................... 15
4-5 BASIC BALANCING ......................................................................................................................... 15
4-6 SETTING MEASURING PARAMETERS....................................................................................... 15
4-6-1 Setting an Basic Internal Gain.................................................................................................... 15
4-6-2 Setting Low-pass Filter................................................................................................................ 16
4-6-3 Setting High-pass Filter............................................................................................................... 16
4-6-4 Zero Point Fine Adjustment........................................................................................................ 17
4-6-5 Sensitivity Fine Adjustment ........................................................................................................ 17
5. FUNCTIONS.............................................................................................................................................. 18
5-1 INPUT .................................................................................................................................................. 18
5-2 OUTPUT .............................................................................................................................................. 18
5-3 PREHEATING .................................................................................................................................... 18
5-4 BRIDGE CHECK ............................................................................................................................... 19
5-5 BALANCING ...................................................................................................................................... 20
5-5-1 Balancing Range........................................................................................................................... 20
5-5-2 Balancing ...................................................................................................................................... 20
5-6 MOVING ZERO POINT.................................................................................................................... 20
5-7 INTERNAL GAIN .............................................................................................................................. 21
5-7-1 Setting Internal Gain with Calibration Signal .......................................................................... 21
5-7-2 Setting Internal Gain with TEDS ............................................................................................... 22

5-7-3 Setting Internal Gain with ACTL LOAD .................................................................................. 23
5-8 LOW-PASS FILTER........................................................................................................................... 23
5-9 CALIBRATION SIGNAL .................................................................................................................. 24
5-10 KEY-LOCK ....................................................................................................................................... 24
5-11 OSC SYNCHRONIZATION............................................................................................................ 25
5-12 APPLICATION OF CENTRALIZED CONNECTOR.................................................................. 27
5-13 REMOTE CONTROL...................................................................................................................... 27
5-13-1 Remote Control Signals ............................................................................................................. 28
5-13-2 External Connection .................................................................................................................. 29
5-14 EXCITATION VOLTAGE ............................................................................................................... 30
5-15 TPN/DLT MEASURING MODE (For the DPM-911/951 only).................................................. 31
6. OPTIONS ................................................................................................................................................... 32
6-1 BRIDGE BOX ..................................................................................................................................... 32
6-1-1 Functions of Bridge Box .............................................................................................................. 32
6-1-2 Models of Bridge Box................................................................................................................... 32
6-1-3 Wiring to Bridge Box................................................................................................................... 33
6-1-4 Shield Conversion Cable N-117 .................................................................................................. 33
6-2 AMPLIFIER STAND FA-1B.............................................................................................................. 34
6-3 EXTENSION CABLE N..................................................................................................................... 34
6-4 NOISE FILTER F ............................................................................................................................... 34
6-5 EXCLUSIVE CARRYING CASE ..................................................................................................... 34
6-5-1 Functions of Exclusive Carrying Case ....................................................................................... 35
6-5-2 Carrier Synchronization between Exclusive Carrying Cases .................................................. 35
7. TROUBLE SHOOTING........................................................................................................................... 36
7-1 DPM-900/950 SERIES CANNOT BE TURNED ON....................................................................... 36
7-2 INITIAL BALANCING IS IMPOSSIBLE ....................................................................................... 36
7-3 NO OUTPUT IS AVAILABLE ........................................................................................................... 37
7-4 INSTABILITY OF THE ZERO POINT ........................................................................................... 38
7-5 LARGE NOISE ................................................................................................................................... 38
8. SPECIFICATIONS ................................................................................................................................... 39
8-1 SPECIFICATIONS ............................................................................................................................. 39
8-2 BLOCK DIAGRAM AND OPERATION PRINCIPLE .................................................................. 41
8-2-1 Block Diagram.............................................................................................................................. 41
8-2-2 Operation Principle ..................................................................................................................... 41
8-3 DIMENSIONAL DRAWING ............................................................................................................. 42
9. APPENDIXES............................................................................................................................................ 43
9-1 BRIDGE CHECK FUNCTION AND RESULT INDICATION...................................................... 43
9-2 LOW-PASS FILTER CHARACTERISTIC ..................................................................................... 44
9-2-1 Low-pass Filter Characteristic ................................................................................................... 44
9-2-2 Response Frequency Characteristic 1 (DPM-911/912/913) ...................................................... 45
9-2-3 Response Frequency Characteristic 2 (DPM-951/952)............................................................. 45
9-3 HOW TO CALCULATE STRAINS .................................................................................................. 46
9-3-1 Method of Calculation Applicable to Strain Gage .................................................................... 46
9-3-2 Correction Required due to the Number of Strain Gage Used ................................................ 47
9-3-3 When using strain gage having gage factor other than 2.00 .................................................... 48
9-3-4 Calculating Methods Applicable to Strain Gage Transducer................................................... 49
9-3-5 Correction Required When an Extension Cable was Used ...................................................... 50
9-4 TROUBLE SHOOTING..................................................................................................................... 51
9-5 E TERMINAL OF INPUT CONNECTOR....................................................................................... 52
9-5-1 E Terminal of DPM-911/912/913................................................................................................. 52

9-5-2 E Terminal of DPM-951/952 ....................................................................................................... 52
9-6 INTERNAL GAIN AND INPUT STRAIN........................................................................................ 53
10. GLOSSARY ............................................................................................................................................. 54

1
STANDARD ACCESSORIES
The DPM-900/950 series Dynamic Strain Amplifier (hereinafter referred to as the DPM-900/950 series)
comes with the following accessories. After unpacking, check to be sure that they are included.
Instruction Manual 1
Simplified instruction manual seal 1
AC power cable (P-25) 1
3p - 2p conversion plug (CM-52) 1
BNC cable (U-59 and U-08) 1 each
Fuses, midget type (1.0 A and 0.5 A) 1 each
Product Warranty 1
SAFETY PRECAUTIONS
The DPM-900/950 series is designed in accordance with “8. SPECIFICATIONS.” Do not use the
DPM-900/950 series in an environment exceeding the specifications. Or, failure of the DPM-900/950
series may result.
PRIOR TO USE
For safe use of the DPM-900/950 series, do not forget to read the “Safety Precautions” prior to use.
Kyowa Electronic Instruments Co., Ltd. assumes no liability for any damages resulting from user’s failure
to comply with the safety precautions.
For safety operation of the DPM-900/950 series, the following symbol mark is used.
Indicates “PROTECTIVE GROUND TERMINAL.”
Be sure to connect the GND terminal to the ground.
However, excludes when grounding with a 3-prong AC power cable.
SAFETY SYMBOLS
For safety operation of the DPM-900/950 series, the following symbol marks are used in the Instruction
Manual.
WARNING
Improper operation of the system may result in death or severe injury of the
operator.
CAUTION
Improper operation of the system may result in injury of the operator and
physical damage of the system.

2
WARNING
Power Supply
To prevent a fire hazard, before connecting the power cable, be sure to check the local line voltage is
matched with the operating voltage specified for the DPM-900/950 series.
Power Cable and Power Outlet
To prevent an electric shock or fire hazard, use the accessory power cable, 3p - 2p conversion plug,
and a power plug with protective ground terminal to the greatest possible extent.
When using 3-prong power cable, use a 3-prong power plug with protective ground terminal.
Operators must be cautioned that use of an extension power cable with no ground conductor disables
the protective ground function.
Read the Instruction Manual first, connect the power cable to the DPM-900/950 series with the
DPM-900/950 series turned OFF and connect the power cable to the power outlet.
Protective Ground
To prevent an electric shock hazard, be sure to ensure protective ground before connecting the power
cable.
If 3p – 2p conversion plug is used, be sure to ground the DPM-900/950 series to the “GND” terminal.
If a 2p flat vinyl power code is used, always ground with optional grounding conductor.
For Electrical Operator Safety
To prevent an electric shock hazard, operators must be cautioned not to cut the protective grounding
conductor or disconnect the GND terminal.
Confirmation of Protective Ground
To prevent an electric shock hazard, if any abnormal matters are found in the protective ground
function, fuse holder, etc., do not operate the DPM-900/950 series. In addition, be sure to check safe
protective ground function before operating the DPM-900/950 series.
External Connection
To prevent an electric shock hazard, ensure the safe protective ground of all concerned instrument and
then, connect the DPM-900/950 series to the measuring object and external devices, PC, etc.
Fuse
To prevent a fire hazard, be sure to use a fuse providing the same rating (current, voltage, type) as
specified for the DPM-900/950 series.
Do not use any fuse other than specified. Do not short-circuit the fuse holder.
Before replacing the fuse, disconnect the power cable from the wall outlet in advance.
Inflammable Gaseous Environment
To prevent fire and explosion hazards, do not operate the DPM-900/950 series where it is exposed to
inflammable gases, inflammable vapors or inflammable dust.
If Any Trouble Occurs
To prevent a fire hazard, if smoke is emitted from the DPM-900/950 series, immediately disconnect
the AC adapter from the receptacle and stop using the DPM-900/950 series.
Maximum Input Voltage Range
The DPM-900/950 series is a measuring instrument specified for strain gage transducers and strain
gages. Do not input high voltage. Or, deteriorated performance and damage of the product may result.

3
CAUTION
After the power OFF, wait more than 5 seconds to power ON again.
If the power switch is repeated turned ON and OFF within 5 seconds, fuse may blow out due to rush
current generated by switching the power ON and the DPM-900/950 series’ reliable function may not be
guaranteed.
Do not use the DPM-900/950 series under excessively high/low temperature.
Use the DPM-900/950 series in the specified operating temperature range -10 to 50ºC.
Use at temperatures exceeding the specified range may lower the performance and cause trouble.
If use under direct sunlight or in a cold place is inevitable, prepare a sunscreen or take proper measures
to keep it warm.
Do not use the DPM-900/950 series under high humidity.
Use in a humid place exceeding the specified range or where it is exposed to splashing water may lower
the performance and cause trouble.
Immediately stop the DPM-900/950 series if operating environment changes abruptly.
Leave the DPM-900/950 series as it is until it becomes adaptable to the environment.
Abrupt change in ambient temperature due to transportation, etc. may cause dew condensation result to
deteriorate its performance and cause trouble.
Do not use the DPM-900/950 series under dusty environment.
If dust is entered into the DPM-900/950 series, performance of the DPM-900/950 series may become
deteriorated. Be sure to keep away from dust not only when operating but also storage.
Take care when operating the DPM-900/950 series at a location with excessive vibration.
If excessive vibration is applied to the DPM-900/950 series, performance of the DPM-900/950 series
may become deteriorated.
Adopt vibration-proof measures such as shock absorber, etc.
Do not use the DPM-900/950 series under poor power condition.
When using the AC power cable, use the DPM-900/950 series within the specified power supply voltage.
Use the DPM-900/950 series in an environment without instantaneous voltage drop or interfering noise.
When using the DC power supply, handle the DPM-900/950 series with utmost care.
Touch the battery terminal by the input/output cable or use the same power supply with the measuring
instrument may cause unexpected trouble. Read “3-2 CONNECTION OF POWER” prior to use.
Do not pull cords and cables.
Lay cords and cables with a certain allowance so that o unreasonable force is applied to the connections.
Pulling or applying unreasonable force may cause trouble or interrupt the measurement.
Preheat the DPM-900/950 series before use.
Preheat the DPM-900/950 series for about 30 to 60 minutes after the power ON.
For using a Rotary Transformer Torque Transducers or Inductance-Type Displacement
Transducer, be sure to set the “Setting Switch 4” on the rear panel to ON. Or, it may cause decreases
in measurement accuracy of the DPM-900/950 series.
Do not install the sensor near the welding machine or measure it near the welding machine.
It may cause various malfunction.
Do not disassemble or remodel.
It may cause electric shock or malfunction. And this product will not be out of warranty

4
NOTATION USED IN THE INSTRUCTION MANUAL
Notational Words
To express strain, “10-6 strain”, “m/m” or “” is used properly.
This Manual uses “” relating to the on-panel indications, and “m/m” when referring to strain in general.
The words suffixed by “*” are explained in “10. Glossary”.
The value converted in SI (the International System units) is given in parentheses after each conventional
expression of a unit.
Informational Notes
Certain notations are used as necessary to attract your attention to information that requires special care
when handling the DPM-900/950 series and to information provided for reference purpose.
Examples of Notations
Essential precautions required when handling the DPM-900/950 series.
NOTE
Reference items required when handling the DPM-900/950 series.
MEMO

5
1. PRODUCT OUTLINE
1-1 PRODUCT OUTLINE
The DPM-900/950 series is a strain amplifier that incorporates an AC excitation voltage. When compared
to a DC type strain amplifier, the DPM-900/950 series generally marks high stability, sensitivity and lower
noise. In addition to these, the DPM-900/950 series provides unique features as follows.
Features
[DPM-900 series]
Allows high accuracy measurement since the DPM-900 series has high S/N ratio.
[DPM-950 series]
Allows high accuracy measurement by inverter noise reduction effect.
[For both DPM-900 and 950 series]
Easy setting
Just set input strain and output voltage at the time.
Light weight
Approximately 15% lighter than the conventional amplifier.
Monitor and bar graph meter are standard provision.
Strain signal can be monitored without connecting the output to the voltmeter.
High output
The rated output is ±10 V (twice of the conventional amplifier).
High stability
The zero point stability of the amplifier is good, it can measure with high accuracy.
TEDS*1 function
When using strain gage transducer with built-in TEDS circuit, the internal gain can be easily set without
referring the Test Data Sheet by pressing the TEDS switch.
ACTL LOAD function
The internal gain can be set with the actual load or external calibrator by enabling the ACTL LOAD
mode.
Bridge check function
This function checks breaking of wires in the strain gage bridge, and the monitor indicates which wires
are broken.
The conventional amplifier is DPM-700B series.
The words suffixed by “*” in the Instruction Manual are explained in “10. Glossary”.
For TEDS function and operation method of the ACTL LOAD function, read “5-7-2 Setting
Internal Gain with TEDS function” and “5-7-3 Setting Internal Gain with ACTL LOAD.”
MEMO

6
パソコン
1-2 SYSTEM CONFIGURATION
This section describes a general system configuration when using the DPM-900/950 series for
measurement.
The DPM-900/950 series adopt the system configuration shown above, whereby it’s input terminal
connects with a strain gage transducer or a strain gage. For connection of the latter, a bride box is used
generally. The DPM-900/950 series amplifies minute signals sensed by a strain gage, and provides an
output of several volts after amplification in general cases. This allows connection of the DPM-900/950
series directly to a recorder or a voltmeter.
To measure a strain converted in electric signals, a calibration signal is used. The DPM-900/950 series uses
a calibration signal that has been certified through a standardizing equipment KYOWA maintains.
For how to use strain gages or how to obtain the stress, read “9. Appendix.”
Strain Gage
(60 to 1000 ohm)
Strain Gage
Transducer
(60 to 1
000
ohm)
Bridge Box
A-D Converter
PC

7
2. PARTS AND FUNCTIONS
2-1 FRONT PANEL
1)
TEDS
switch
Press
and hold
TEDS
switch. The
TEDS
switch lights up in blue,
the
setting mode becomes
TEDS
mode
.
2)
ACTL
LOAD
switch
Press and hold
ACTL
LOAD
switch. The
ACTL
LOAD
switch lights up in
orange, the setting mode becomes setting mode with the input strain.
3)
L.P.F.
switch
Changes a cutoff frequency of the low
-
pass filter.
< changes to a smaller one
> changes to a larger one
(10 Hz
«
30 Hz
«
100 Hz
«
300 Hz
«
1 kHz
«
FLAT)
4)
V
ADJ.
switch
Conduct zero
-
point fine adjustment and sensitivity fine adjustment of
output voltage.
+
:
–
:
Zero
-
point moves to a positive direction.
Zero
-
point moves
to a negative direction.
With pressing the
SET
switch or
+
of the
CAL
ON
switch, press
+
of
the
V
ADJ.
switch for high sensitivity, press
–
for low sensitivity.
5)
H.P.F.
switch
P
ress
and hold
H.P.F
.
switch to c
han
ges valid or invalid of the H.P
.
F.
Whe
n
the
H.P.F is valid, the H.P.F
.
lamp
(item 19)) lights up.
6)
BAL
switch
Press the
BAL
switch twice for balancing.
Press and hold the
BAL
switch for disconnection check of the bridge.
7)
SET
switch
Set the
VOLTAGE
OUT
and
CAL
switches. Press the
SET
switch twice to
set t
he internal gain of the DPM
-
900/950
series.
8)
CAL
ON
switch
+
:
–
:
Add
+ calibration signal that is set to the
CAL
switch to the output.
Add
-
calibration signal that is set to the
CAL
switch to the output.
9)
KEY
LOCK
switch
Set the
KEY
LOCK
switch to left for prohibiting operations other than
POWER
switch.
10)
VOLTAGE
OUT
switch
For setting the output voltage.
11)
CAL
switch
For setting
the
input strain and required calibration signal value.
Press and hold is an operation for continuously pressing the switch for 0.5 seconds or more.
Press twice is an operation to press the switch twice within 0.5 seconds.
NOTE
5
6
9
7
8
3
1
4
2
10
11

8
21
12)
POWER
switch
POWER ON/OFF
Press the
POWER
switch for turned ON and press again for turned OFF.
13)
INT lamp
Lights up when using the internal
oscillator
output for the ex
citation
voltage of
the DPM
-
900/950
series as the carrier.
14)
Bar graph meter
Indicates an output voltage by the length of the bar.
One LED segment corresponds to 2 V.
When the internal gain is fine adjusted to lower than ×200, 0 (orange LED)
flickers. For details, read
“
4
-
6
-
5 Sensitivity Fine Adjustment.
”
15)
L.P.F. lamp
Displays the cutoff frequency of
the
L.P.F.
16)
Monitor
Indicates the output voltage of the OUTPUT A and B in general.
If the output voltage at the OUTPUT A or OUTPUT B exceeds ±11V,
numbers or characters on the monitor flicker.
In addition, indicates the physical quantity in TEDS mode and error content
in error mode.
17)
BV 0.5 V lamp
When outputting 0.5 Vrms excitation voltage, the BV 0.5 V lamp lights up
and when outputting 2 Vrms excitation voltage, the BV 0.5 V lamp lights
out.
18)
V lamp
Lights up when
displaying
voltage on the monitor. Lights out only in the
TEDS mode.
19)
H.P.F. lamp
Lights up when the H.P.F
.
switch is set to valid. When invalid, the H.P.F.
lights out.
20)
VOLTAGE OUT lamp
Lights up after setting
the
internal gain correctly.
After setting the internal gain, if the set value of the VOLTAGE OUT
switch is changed, the VOLTAGE OUT lamp flickers.
21)
CAL lamp
Lights up after setting
the
internal gain correctly.
After setting the internal gain, if the set value of the CAL switch is
changed, the CAL lamp flickers.
Lights out when in TEDS mode and ACTL LOAD mode.
Internal gain: Gain from the input to the output of the DPM-900/950 series.
Capable of setting the internal gain within ×200 to ×20000.
In addition, when the internal gain is large, it means high sensitivity and when it is small, low
sensitivity.
NOTE
12
13
14
15
16
17
18
19
20

9
1
6
7
2
3
4
5
2-2 REAR PANEL
1) INPUT connector NDIS connector
Connects with a strain gage transducer or a bridge box.
2) OUTPUT A connector BNC connector
Outputs voltage based on the preset internal gain when the strain is input.
Outputs the same voltage with the OUTPUT B connector. The rated output is
10 V.
3) OUTPUT B connector BNC connector
Outputs voltage based on the preset internal gain when the strain is input.
Outputs the same voltage with the OUTPUT A connector. The rated output is
10 V.
4) OSC terminal Terminal for OSC (internal oscillator) input/output
Used for synchronous operation of multiple DPM-900/950 series units
through parallel connection of [+] and [-].
5) GND terminal For grounding.
It is connected internally to the common electric potential of the circuitry.
6) Setting Switch Used for selecting the oscillator (AUTO/MANU, INT/EXT) and excitation
voltage (0.5 Vrms/2 Vrms). In addition, the “Setting Switch” is used for
setting measuring mode (DPM-911/951 only) of the Rotary Transformer
Torque Transducer or Inductance-Type Displacement Transducer.
For details of the setting method, read “5-11 OSC SYNCHRONIZATION”,
“5-14 EXCITATION VOLTAGE” and “5-15 TPN/DLT MEASURING
MODE.”
7) Centralized connector For connecting the power cable in general.
When the DPM-900/950 series are housed in the carrying case, it enables to
connect them with certain control signals.

10
3. PREPARATION
This chapter describes necessary preparation before turning ON the power and how to use a single unit of
DPM-900/950 series.
For how to use multiple units (channels) housed in the exclusive carrying cases, also read “6-5
EXCLUSIVE CARRYING CASE.”
3-1 HOW TO SET UP INPUT/OUTPUT INSTRUMENTS
When measuring strain with the DPM-900/950 series, connect input signal, output instrument and power to
the DPM-900/950 series. The output instrument can be omitted in some cases.
3-1-1 Input Instrument
Prepare a strain gage transducer or strain gage configured in the Wheatstone Bridge*2. When using a strain
gage, also prepare a bridge box by referring to “6-1 BRIDGE BOX.”
3-1-2 Output Instrument
Output instrument is a voltmeter with input impedance 5 kohm or more or recorder. Requires for reading
the amplified strain signal.
Since the DPM-900/950 series has a monitor, voltmeter etc. is not necessary. Connect the output
instrument to the DPM-900/950 series using the output cable, and accessory.
For the connection with the output instrument, read “4-2 CONNECTION OF OUTPUT” and “5-2
OUTPUT.”
3-2 CONNECTION OF POWER
3-2-1 AC Power
Use the accessory power cable and connect the DPM
-
900/950
series to an AC power outlet as described right. Before
connecting the DPM-900/950 series, be sure to check the
power supply voltage is within the specified range.
3-2-2 DC Power
A DC power in a voltage range of 10.5 V to 15 V, or a battery
is connectable.
A DC power cable is not attached to the DPM-900/950 series.
Therefore prepare a connector plug (HIROSE ELECTRIC’s
S-1620A-C or the equivalent) and use it as shown at right.
For connection to the DC power, read “5-12 APPLICATION
OF CENTRALIZED CONNECTOR.”
The DPM
-
900/950
series requires AC or DC power.
In either case, make sure of the power voltage prior to
connection.
AC outlet
Earth
12V
+
Battery
-
Ground the middle prong of the 3-prong plug without fail.
NOTE

11
3-2-3 Grounding
Be sure to carry out correct grounding, in order to prevent accidents and assure the safety of the operator.
When using AC power, connect the amplifier to a power source using the accessory AC power cable
(3-prong). The grounding will then be carried out automatically.
L = Line
N = Neutral
E = Earth
3-3 INITIAL SETTING
Set all “Setting Switches 1 to 4” to OFF.
When using the accessory 3p - 2p conversion plug (CM-52), be sure to ground its earth terminal
(green).
NOTE
Note that “Setting Switch 1” is not necessarily to
set to OFF when operating multiple DPM-900/950
series units at a time.
Read “5-11 OSC SYNCHRONOUS.”
MEMO
Although the “Setting Switch 4” is usually turned OFF, set the “Setting Switch 4” to ON only
when using the Rotary Transformer Torque Transducer or Inductance-Type Displacement
Transducer with the DPM-911/951.
For details, read “5-15 TPN/DLT MEASURING MODE.”
No operation of the DPM-912/913/952 changes whether ON or OFF is selected.
NOTE
Setting
Switch

12
(Output Voltage)
(Excitation Voltage)
4. BASIC OPERATION
This chapter describes the basic operation of the DPM-900/950 series.
The instructions given in this chapter is related to the usage of a single unit.
4-1 CONNECTION OF INPUT
If the connection cable of a strain gage transducer comes without the NDIS connector on its end or if a
strain gage is to be connected directly, either of the following 2 methods can be used.
Connect a strain gage (via a bridge box) or a
strain
gage transducer to the DPM-900/950 series’ INPUT
connector.
Configure a Wheatstone Bridge with the strain gage(s)
and the bridge box.
If one end of the connection cable of a strain gage
transducer is formed by a NDIS connector, insert it
into the INPUT connector directly as shown at right.
1)
When using the bridge box for connection
Read “6-1 BRIDGE BOX.”
2)
When connecting the strain gage to the plug in advance
A connection method is shown in the right. The plug is NDIS
connector PRC03-12A10-7M10 (TAJIMI).
For connection of a strain gage, a bridge box of full bridge
method
*5
can be conveniently used.
When disconnecting, pull the plug toward you.
Bridge Box
Strain Gage
When connecting the cable, hold the plug and
Transducer
push it in the jack.
or
Output
NDIS Connector
Green
White
Black
Red
Shield
Transducer Case
A
B
CD
E
F
For operation of multiple channels using the exclusive carrying case, read “6-5 EXCLUSIVE
CARRYING CASE.”
MEMO
G
Input
TEDS
(+)
(-)
Yellow
Blue
Do not connect a remote sensing sensor to the DPM-900/950 series. The F terminal and G terminal are
input terminals dedicated for the TEDS.
NOTE
For the E terminal, read “9-5 E TERMINAL OF
INPUT CONNECTOR.”
Wire colors described in figures are typical colors of
KYOWA strain gage transducer.
MEMO

13
4-2 CONNECTION OF OUTPUT
T
he
DPM
-
900/950
series provides
OUTPUT A and OUTPUT B. These
systems output the same voltage but are
independent of each other. Therefore, 2
external instruments can be connected at a
time. The both output terminals accept a
BNC plug. Use the accessory output cable
to connect an external instrument. The
output impedance*6 is rated at about 2 ohm
on either terminal.
BNC Connector
Connect a recorder or voltmeter.

14
4-3 TURNING ON AND OFF THE POWER
Turning ON and OFF the power is the most important operation. Read the following instructions carefully.
4-3-1 Turning ON the Power
Press the POWER switch until it clicks.
At this time, all LEDs illuminate for about 3 seconds. After that, measuring conditions are set and the
DPM-900/950 series become measuring state.
4-3-2 Turning OFF the Power
Press the POWER switch.
All indications disappear.
Prior to turning ON, make sure the input/output connector and
power are correctly connected.
The DPM-900/950 series maintains all measuring parameters in its internal nonvolatile memory
all the time.
However, saving of parameters may fail if the power is turned OFF immediately after the
renewal. To prevent it, after conducting the zero adjustment, sensitivity fine adjustment,
changing LPF setting or HPF setting, wait 3 seconds or more and turn OFF the power. In
addition, if you turned OFF the power without setting the internal gain after changing mode to
the TEDS or ACTL LOAD mode, turning ON the power again changes the TEDS mode or
ACTL MODE to the normal mode. (Conduct the internal gain setting to maintain the current
mode.)
NOTE
POWER switch
After turning ON the power, be sure to bridge check the DPM-900/950 series before
measurement. (However, excluding cases using Rotary Transformer Torque Transducer.)
For details, read “5-4 BRIDGE CHECK.”
NOTE
For connection, read the following.
“3-1 SETTING UP INPUT/OUTPUT INSTRUMENT”
“3-2 CONNECTION OF POWER”
“4-1 CONNECTION OF INPUT”
“
4
-
2 CONNECTION OF OUTPUT
”
MEMO

15
4-4 SELECTING MODE
The DPM-900/950 series provides “Normal Mode”, “TEDS Mode” “ACTL LOAD Mode” and “TPN/DLT
Measuring Mode.” Setting methods of the internal gain and display unit of the indication varies with every
mode.
“TEDS Mode”
Setting and cancelation is possible by pressing and holding
TEDS
switch.
While “TEDS Mode” is set,
TEDS
switch light
up.
“ACTL LOAD Mode”
Setting and cancelation is po
ssible
by pressing and holding
ACTL
LOAD
switch.
While “ACTL LOAD Mode” is set,
ACTL
LOAD
switch light up.
“Normal Mode”
W
hen
both
TEDS
switch and
ACTL
LOAD
switch is off, “Normal Mode”
is set.
“
TPN/DLT
Measuring Mode
”
T
urni
n
g
on “Setting Switch 4” on
the
rear panel make it setting.
(
DPM
-
911/951 only
)
However, “Normal Mode” and “TPN/DLT Measuring Mode” have no outward difference. For how to
confirm modes, read the MEMO in “5-15 TPN/DLT MEASURING MODE.”
For the setting methods of the internal gain, read “5-7 INTERNAL GAIN.”
4-5 BASIC BALANCING
4-6 SETTING MEASURING PARAMETERS
This section describes how to set the measuring parameters of the DPM-900/950 series.
4-6-1 Setting an Basic Internal Gain
The DPM
-
900/950
series performs balan
cing completely
electronically.
Make sure that input signals are connected, and then press the
BAL switch twice.
Balancing will then be carried out irrespective of the setting
conditions of other parameters.
It is necessary to set an internal gain (sensitivity
*10
)
properly to assure the correct strain measuring.
This section describes how to select the internal gain with
the CAL switch.
For details, read “5-7 INTERNAL GAIN.”
First, estimate the strain to be measured.
When using the strain gage transducer for the input, set
the internal gain from the rated output.
For example, when using the strain gage transducer with
±1000 m/m rated output.
For setting the internal gain with 10 V of the rated input,
set VOLTAGE OUT switch to 10.00 and CAL switch to
1000 and press the SET switch twice.
After the internal gain is correctly set, (SET)
appears on the monitor.
VOLTAGE OUT switch
CAL switch
SET switch
BAL switch
After balancing is executed, the panel meter will not necessarily read exactly 0 but several mV
remains.
Carry out fine balancing by using the V ADJ. switch if necessary.
MEMO
This manual suits for next models
4
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