KYOWA CDV-900A User manual

IM-A-945 July 2013
INSTRUCTION MANUAL
CDV/CDA-900A
SIGNAL CONDITIONER
Thank you for purchasing KYOWA’s product CDV/CDA-
900A Signal Conditioner.
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.
Generally, company names and trade names described in this Instruction Manual are trademarks or registered
trademarks of the companies.
This Instruction Manual may not be copied or reproduced, in whole or part, without consent of KYOWA.
Copyright © Kyowa Electronic Instruments Co., Ltd. All rights reserved.
The contents of the Instruction Manual are subjected to change without prior notice.

CONTENTS
STANDARD ACCESSORIES................................................................................................................................................................1
SAFETY PRECAUTIONS......................................................................................................................................................................1
PRIOR TO USE......................................................................................................................................................................................1
SAFETY SYMBOLS.............................................................................................................................................................................1
LIMITED LIFE PARTS AND PREVENTIVE MAINTENANCE............................................................................................4
CDV/CDA-900A REPLACEMENT BEFORE THE END OF SERVICE LIFE..................................................................4
NOTATIONS USED IN THE INSTRUCTION MANUAL..........................................................................................................5
INFORMATIONAL NOTES........................................................................................................................................................................5
1. PRODUCT OUTLINE....................................................................................................................................................................6
1-1. PRODUCT OUTLINE...........................................................................................................................................................6
1-2. SYSTEM CONFIGURATION............................................................................................................................................7
2. PARTS AND FUNCTIONS.................................................................................................................................................................8
2-1. FRONT PANEL..............................................................................................................................................................................8
2-2. REAR PANEL...............................................................................................................................................................................10
3. PREPARATION...................................................................................................................................................................................11
3-1. HOW TO SET UP INPUT/OUTPUT INSTRUMENTS..................................................................................................11
3-1-1 Input Instrument...............................................................................................................................................................................11
3-1-2 Output Instrument............................................................................................................................................................................11
3-2. CONNECTION OF POWER...................................................................................................................................................11
3-2-1 AC Power...........................................................................................................................................................................................11
3-2-2 DC Power...........................................................................................................................................................................................12
3-2-3 Grounding..........................................................................................................................................................................................12
4. BASIC OPERATIONS.......................................................................................................................................................................13
4-1. CONNECTION OF INPUT......................................................................................................................................................13
4-2. CONNECTION OF OUTPUT.................................................................................................................................................14
4-3. TURNING ON AND OFF THE POWER.............................................................................................................................15
4-3-1 Turning ON the Power...................................................................................................................................................................15
4-3-2 Turning OFF the Power.................................................................................................................................................................15
4-4. SELECTING MODE..................................................................................................................................................................16
4-5. TO SELECT THE SENSITIVITY REGISTRATION MODE.....................................................................................16
4-6. BASIC BALANCING.................................................................................................................................................................16
4-7. SETTING MEASURING PARAMETERS.........................................................................................................................17
4-7-1 Setting an Basic Internal Gain.....................................................................................................................................................17
4-7-2 Setting Low-pass Filter..................................................................................................................................................................18
4-7-3 Setting High-pass Filter.................................................................................................................................................................18
4-7-4 Zero Point Fine Adjustment.........................................................................................................................................................18
4-7-5 Sensitivity Fine Adjustment.........................................................................................................................................................19
5. FUNCTIONS.........................................................................................................................................................................................20
5-1. INPUT..............................................................................................................................................................................................20

5-2. OUTPUT.........................................................................................................................................................................................21
5-3. PREHEATING.............................................................................................................................................................................21
5-4. BRIDGE RESISTANCE CHECK..........................................................................................................................................21
5-5. BALANCING................................................................................................................................................................................22
5-5-1 Balancing Range..............................................................................................................................................................................22
5-5-2 Balancing............................................................................................................................................................................................22
5-6. MOVING ZERO POINT...........................................................................................................................................................22
5-7. INTERNAL GAIN.......................................................................................................................................................................23
5-7-1 Setting Internal Gain with the Calibration Signal................................................................................................................23
5-7-2 Setting Internal Gain with TEDS...............................................................................................................................................25
5-7-3 Setting Internal Gain with Actual Load...................................................................................................................................27
5-8. LOW-PASS FILTER...................................................................................................................................................................27
5-9. CALIBRATION SIGNAL.........................................................................................................................................................28
5-10. KEY-LOCK.................................................................................................................................................................................28
5-11. APPLICATION OF CENTRALIZED CONNECTOR.................................................................................................29
5-12. REMOTE CONTROL.............................................................................................................................................................30
5-12-1 Remote Control Signals..............................................................................................................................................................30
5-12-2 External Connection.....................................................................................................................................................................31
5-13. SETTING SWITCH.................................................................................................................................................................31
5-14. BRIDGE EXCITATION VOLTAGE..................................................................................................................................33
5-15. REMOTE SENSING................................................................................................................................................................34
5-16. USER-SPECIFIED REGISTRATION FUNCTION.....................................................................................................35
5-16-1 Items that can be Registered on the CDV-900A.................................................................................................................35
5-16-2 Items that can be Registered on the CDA-900A................................................................................................................37
6. OPTIONS................................................................................................................................................................................................39
6-1. BRIDGE BOX...............................................................................................................................................................................39
6-1-1 Functions of Bridge Box...............................................................................................................................................................39
6-1-2 Models of Bridge Box....................................................................................................................................................................39
6-1-3 Wiring to Bridge Box.....................................................................................................................................................................40
6-2. AMPLIFIER STAND FA-1B....................................................................................................................................................41
6-3. EXTENSION CABLE N............................................................................................................................................................41
6-4. NOISE FILTER F........................................................................................................................................................................41
6-5. EXCLUSIVE CARRYING CASE..........................................................................................................................................41
7. TROUBLE SHOOTING....................................................................................................................................................................43
7-1. CDV/CDA-900A CANNOT BE TURNED ON...................................................................................................................43
7-2. INITIAL BALANCING IS IMPOSSIBLE..........................................................................................................................43
7-3. NO OUTPUT IS AVAILABLE.................................................................................................................................................44
7-4. INSTABILITY OF THE ZERO POINT...............................................................................................................................44
7-5. LARGE NOISE............................................................................................................................................................................44
8. SPECIFICATIONS..............................................................................................................................................................................46
8-1. SPECIFICATIONS.....................................................................................................................................................................46
8-2. BLOCK DIAGRAM AND OPERATION PRINCIPLE..................................................................................................48
8-2-1 Block Diagram..................................................................................................................................................................................48
8-2-2 Operation Principle.........................................................................................................................................................................48
8-3. DIMENSIONAL DRAWING...................................................................................................................................................49
9. APPENDIXES.......................................................................................................................................................................................50
9-1. LOW-PASS FILTER CHARACTERISTIC.......................................................................................................................50

9-1-1 Low-pass Filter Characteristic....................................................................................................................................................50
9-1-2 Response Frequency Characteristic..........................................................................................................................................50
9-2. HOW TO CALCULATE STRAINS......................................................................................................................................51
9-2-1 Method of Calculation Applicable to Strain Gage...............................................................................................................51
9-2-2 Correction Required due to the Number of Strain Gages Used.......................................................................................52
9-2-3 When using strain gage having gage factor other than 2.00.............................................................................................55
9-2-4 Calculating Methods Applicable to Strain Gage Transducer............................................................................................56
9-2-5 Correction Required when an Extension Cable was Used................................................................................................57
9-3. TROUBLE SHOOTING...........................................................................................................................................................58
9-4. INTERNAL GAIN AND INPUT STRAIN...........................................................................................................................59
10. GLOSSARY.........................................................................................................................................................................................60

1
STANDARD ACCESSORIES
The following accessories are packed with the Signal Conditioner CDV/CDA-900A (hereinafter referred to
as the CDV/CDA-900A). When unpacking, check the contents to ensure that all accessories are enclosed.
Instruction Manual 1
Simplified instruction manual seal  1
AC power cable (P-25) 1
3p-2p conversion plug (CM-39)  1
BNC cable (U-59 and U-08)1 each
Warranty and Test Data Sheet1 each
SAFETY PRECAUTIONS
The CDV/CDA-900A is designed in accordance with "8. SPECIFICATIONS." Do not use the CDV/CDA-
900A in an environment exceeding the specifications. Or, failure of the CDV-CDA-900A may result.
PRIOR TO USE
For safe use of the CDV/CDA-900A, do not forget to read the “Safety Precautions” prior to use.
Kyowa Electronic Instruments Co., Ltd. assumes no liability for any damage resulting from the user’s failure
to comply with the safety precautions.
For safety operation of the CDV/CDA-900A, the following symbol mark is used.
GND 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 CDV/CDA-900A, 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.
Prohibited
Prohibited acts

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 CDV/CDA-900A.
Power Cable and Power Outlet
To prevent an electric shock or fire hazard, use the accessory power cable, 3p - 2p conversion adapter,
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 CDV/CDA-900A with the CDV/CDA-
900A 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 adapter is used, be sure to ground the CDV/CDA-900A 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.
External Connection
To prevent an electric shock hazard, ensure the safe protective ground of all concerned instrument and
then, connect the CDV/CDA-900A to the measuring object and external devices, PC, etc.
Avoid using in environment with inflammable gas, etc.
To prevent the risk of fire hazard or explosion, do not use the CDV/CDA-900A in environment with
inflammable gas, vapor or dust.
If any trouble occurs
To prevent a fire hazard, if smoke is emitted from the CDV/CDA-900A, immediately disconnect the AC
adapter from the receptacle and stop using the CDV/CDA-900A.
Maximum input voltage range
Do not input voltage lower than -15 V or higher than +15 V. Or, it may lower the performance and cause
troubles.

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 CDV/CDA-900A reliable function may not be
guaranteed.
Do not use the CDV/CDA-900A under excessively high/low temperature.
Use the CDV/CDA-900A 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 CDV/CDA-900A 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 CDV/CDA-900A if operating environment changes abruptly.
Leave the CDV/CDA-900A 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 CDV/CDA-900A under dusty environment.
This can lead to performance problems and decreased operating efficiency. Be careful that dust may not
enter the CDV/CDA-900A not only during operation but also under stored conditions.
Take care when operating the CDV/CDA-900A at a location with excessive vibration
If excessive vibration is applied to CDV/CDA-900A , performance of the CDV/CDA-900A may become
deteriorated.
Adopt vibration-proof measures such as shock absorber, etc..
Do not use the CDV/CDA-900A under poor power condition.
When using the AC power cable, operate the CDV/CDA-900A within the range of 100 to 240 VAC
(50/60 Hz). The power supply used for the CDV/CDA-900A should not experience an instantaneous
power failure and be free from noise.
When using the DC power supply, handle the CDV/CDA-900A 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 CDV/CDA-900A before use.
Preheat the CDV/CDA-900A for about 30 to 60 minutes after the power ON.
Do not use the CDV/CDA-900A in strong electromagnetic field.
Performance may be lowered and erroneous operation and troubles may result if it is used near a telemetry
system, microwave oven, electronic furnace or any other equipment generating a strong magnetic field.
Do not disassemble or remodel the CDV/CDA-900A.
Disassembling or remodeling by user may cause electric shock hazards or damage the CDV/CDA-900A.
This warranty does not cover any damaged or defective parts that results from disassembling or
remodeling.
Avoid installing sensors and CDV/CDA-900A near a welding machine.
Failure to do so will pose the risk of erroneous output, malfunction and failure.

4
LIMITED LIFE PARTS AND PREVENTIVE MAINTENANCE
The CDV/CDA-900A consists of various electronic components and those components, if not all, have a
useful life.
Using them exceeding the years specified according to each part type (useful life) may affect the
characteristics of the CDV/CDA-900A, resulting in a malfunction or a failure. You need to replace parts with
a regular preventive maintenance schedule.
Limited life parts used with the CDV/CDA-900A are as follows.
Relay
A relay's insulation will inevitably degrade or a relay itself will be damaged.
Aluminum electrolytic capacitor
The signal-noise ratio will lower due to capacity low or smoke will be emitted due to liquid leak,
resulting in a malfunction of the CDV/CDA-900A.
EEPROM
The CDV/CDA-900A will results in malfunctions or degraded performance.
To operate the CDV/CDA-900A normally, finding a sign of the CDV/CDA-900A failure early by
daily/periodic inspections and taking the corrective action are required.
For inspection, contact KYOWA or our representatives.
* All components do age and will fail.
CDV/CDA-900A REPLACEMENT BEFORE THE END OF SERVICE LIFE
Preventive maintenance and replacement parts are a cost-effective way of keeping the performance and
extending the service life of the CDV/CDA-900A.
Regardless of the replacement parts, the CDV/CDA-900A itself gradually deteriorates with age. Before the
expected service life is reached, consider replacing the CDV/CDA-900A with a new one or the latest series
as preventive maintenance.

5
NOTATIONS 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 handing the CDV/CDA-900A and to information provided for reference purpose.
Examples of Notations
Essential precautions required when handling the CDV/CDA-900A.
NOTE
Reference items required when handling the CDV/CDA-900A.
MEMO

6
1. PRODUCT OUTLINE
1-1. PRODUCT OUTLINE
The CDV/CDA-900A is a strain amplifier that incorporates an DC bridge excitation. When compared to a
AC type strain amplifier, the CDV/CDA-900A generally marks broadband, higher input impedance, and
better nonlinearity. In addition to these, the CDV/CDA-900A provides unique features as follows.
Features
Easy setting
Just set input strain and output voltage at the time.
Light weight
Approximately 30% lighter than the conventional signal conditioner.
Monitor and bar graph meter are standard provision
Not only static strain but also dynamic strain signal can be monitored.
Low noise
Reduce noise by 30% than the conventional product.
DC amplifier function provided
Capable of 10,000 amplifications as a DC amplifier
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.
TEDS-compatible sensors and remote-sensing sensors*14 available
Capable of using both TEDS-compatible sensors and remote-sensing sensors by using the TEDS-
sensor/remote--sensing sensor detection function.
ACTL LOAD function
The internal gain can be set with the actual load or external calibrator by pressing the ACTL LOAD
switch.
Bridge resistance check function
This function checks breaking of wires in the strain gage bridge, and the monitor indicates which wires
are broken.
The conventional product is the CDV/CDA-700A.
The words suffixed by "*" in the Instruction Manual are explained in "10. GLOSSARY."
For TEDS function and operation method of the ACTL LOAD function, see "5-7-2 Setting Internal Gain
with TEDS" and "5-7-3 Setting Internal Gain with Actual Load."
MEMO

7
PC
1-2. SYSTEM CONFIGURATION
This section describes a general system configuration when using the CDV/CDA-900A for measurement.
The CDV/CDA-900A 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 bridge box is used generally. The CDV/CDA-900A 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 CDV/CDA-900A directly to a recorder or a voltmeter.
To measure a strain converted in electric signals, a calibration signal is used. The CDV/CDA-900A 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 application, see "9. APPENDIXES."
Strain Gage
(60 to 1kohm)
Strain Gage
Transducer
(60 to 1 kohm）
Bridge Box
A/D
converter
Micro voltage

8
2. PARTS AND FUNCTIONS
2-1. FRONT PANEL
①TEDS switch Press and hold the TEDS switch. The TEDS switch lights up in blue, the
setting mode becomes "TEDS MODE."
②ACTL LOAD switch Press and hold the ACTL LOAD switch. The ACTL LOAD switch lights
up in orange, the setting mode becomes setting mode with the input strain
(voltage).
③LP.F. switch Changes a cutoff frequency of the low-pass filter.
<: Changes to a smaller one
>: Changes to a larger one
(10 Hz « 100 Hz « 1k Hz « 10k Hz « 100 kHz « FLAT)
④V 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.
⑤H.P.F. switch Changes valid or invalid of the high-pass filter.
When the high-pass filter is valid, the H.P.F. lamp [item (19)] lights up.
⑥BAL switch Press the BAL switch twice for balancing.
Press and hold the BAL switch for resistance check of the bridge.
⑦SET switch Set the VOLTAGE OUT and CAL switches. Press the SET switch twice
to set the internal gain of the CDV/CDA-900A.
⑧CAL ON switch +: Adds + calibration signal that is set to the CAL switch to the output.
: Adds - calibration signal that is set to the CAL switch to the output.
⑨KEY LOCK switch Set the KEY LOCK switch to left for prohibiting operations other than
POWER switch.
⑩VOLTAGE OUT switch For setting the output voltage.
⑪CAL switch For setting the input strain (or voltage) 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
10
4
2
11

9
21
⑫POWER switch POWER ON/OFF
(ON: The POWER switch is in the pressed position.
OFF: The POWER switch is in the released position.)
⑬Indicator lamp Flickers when the remote sensing is ON (CDV-900A).
Lights up after executing the cable-resistance-compensation function (CDV-900A).
Lights up after executing the bridge-resistance-compensation function (CDA-900A).
⑭Bar 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, see "4-7-5 Sensitivity Fine Adjustment."
⑮L.P.F. lamp Indicates the cutoff frequency of the low-pass filter.
⑯Monitor Indicates the output voltage of the OUTPUT A and B in general.
If the output voltage of 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.
⑰DC AMP lamp Lights up during the "DC AMP MODE."
Lights out during the "STRAIN MODE."
⑱V lamp Lights up when displaying voltage on the monitor.
Lights out only in the "TEDS MODE."
⑲H.P.F. lamp Lights up when the H.P.F. switch is set to valid.
When invalid, the H.P.F. lamp lights out.
⑳VOLTAGE 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.
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 in the "TEDS MODE" and "ACTL LOAD MODE."
In addition, the CAL lamp also flickers when adding the different CAL value,
that is set in internal gain, to the output.
Internal gain: Gain from the input to the output of the CDV/CDA-900A.
Capable of setting the internal gain within ×200 to ×10000.
In addition, when the internal gain is high, it means high sensitivity and when it is low, low sensitivity.
MEMO
12
13
14
15
16
17
18
19
20
21

10
2-2. REAR PANEL
①INPUT connector△
！NDIS connector
Connects with a strain gage transducer or a bridge box.
②OUTPUT 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.
③OUTPUT 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.
④COM terminal Common terminal
Connected internally to common potentials in the circuitry,
⑤GND terminal GND terminal
For details, see "3-2-2 DC Power."
⑥SETTING SWITCH Sets the bridge excitation voltage and measuring mode.
For details, see "5-13. SETTING SWITCH."
⑦Centralized connector △
！For connecting the power cable in general.
When the CDV/CDA-900A units are housed in a carrying case, it enables
to connect them with certain control signals.
For details. see "5-11. APPLICATION OF CENTRALIZED
CONNECTOR."
1
6
7
2
3
5
4

11
3. PREPARATION
This chapter describes necessary preparation before turning ON the power and how to use a single unit of the
CDV/CDA-900A.
For how to use multiple units (channels) housed in the carrying case, also see "6-5. EXCLUSIVE
CARRYING CASE"
3-1. HOW TO SET UP INPUT/OUTPUT INSTRUMENTS
When measuring strain with the CDV/CDA-900A, connect input signal, output instrument and power to the
CDV/CDA-900A. 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.
For a bridge box, see "6-1. BRIDGE BOX."
For how to connect an input instrument, see "4-1. CONNECTION OF INPUT."
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.
The CDV/CDA-900A is provided with a monitor, and so it eliminates the need for a regular voltmeter.
Connect the output instrument to the CDV/CDA-900A using the accessory output cable.
For how to connect an output instrument, see "4-2. CONNECTION OF OUTPUT" and "5-2. OUTPUT."
3-2. CONNECTION OF POWER
The CDV/CDA-900A requires AC or DC power.
In either case, make sure of a correct power voltage prior to
connection.
3-2-1 AC Power
Use the accessory power cable and connect the CDV/CDA-
900A to an AC outlet 100 VAC.
The AC outlet should be 100 to 240 VAC (50/60 Hz).
If the power voltage exceeds the above specified voltage range or if a voltage between each terminal and the
grounding has a potential exceeding power voltage, do not connect the AC power. Or, it may cause trouble or
damage to the CDV/CDA-900A.
The power supply voltage should be checked according to the procedure
described below.
(1) Use the tester to measure the voltage between the AC power outlet
terminals and ensure that the voltage is within the range of 100 to
240 VAC.
Tester
AC outlet
Grounding

12
Battery
12 Ｖ
＋ −
(2) Use the testers to measure the voltage levels between the
ground and each of the AC power outlet terminals to ensure that
one voltage level is 0 V and the other is within the range of 100 V
to 240 VAC.
Grounding
(3) If the CDV/CDA-900A is used at job site where induction motors, electric welder and other devices that
generate noise are used, power supply condition may be insufficient due to noise. It is recommended to use
Kyowa’s insulation transformer or noise cut transformer.
3-2-2 DC Power
A DC power in a voltage range of 10.5V to 15 V, or a battery is
connectable. A DC power cable is not attached to the
CDV/CDA-900A. Therefore purchase connector plug (S-1620-
C, HIROSE ELECTRIC CO., LTD), and use it as shown at right.
For how to connect with DC power, see "5-11. APPLICATION
OF CENTRALIZED CONNECTOR."
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 CDV/CDA-900A to a power source using the accessory AC power cable
(3-pin).
L ＝Line
N ＝Neutral
E ＝Earth
Be sure to ground the middle pin of the 3-pin plug.
NOTE
When using an AC power cable (2-pin), use the accessory 2-pin conversion plug (CM-39). Be sure to
ground the green terminal of the conversion adapter.
NOTE
Tester
Tester

13
Bridge box
or
Strain
gage
transducer
When connecting the cable, hold the plug and
push it in the jack.
The plug is automatically locked.
When disconnecting, pull the plug toward you.
NDIS connector
Green
Black
White
Red
Shield
Transducer's case
Ａ
Ｂ
Ｃ
Ｄ
Ｅ
Ｆ
Ｇ
Input
Output
(Output voltage)
(Excitation Voltage)
4. BASIC OPERATIONS
This chapter describes the basic operations of the CDV/CDA-900A.
The instructions given in this chapter is related to the usage of a single unit.
4-1. CONNECTION OF INPUT
Connect a strain gage transducer or a bridge box to
the CDV/CDA-900A's 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.
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.
(1) When using the bridge box for connection.
For details, see "6-1. BRIDGE BOX."
(2) When connecting the strain gage to the plug in advance
Connection diagrams are as follows. The plug is NDIS
connector PRC03-12A10-7M10 (TAJIMI
ELECTRONICS CO., LTD.).
For connection of a strain gage, a bridge box of the full
bridge system*5 can be conveniently used.
Connection of a bridge and plug (4-wire)
Connection of a bridge and plug (6-wire/remote sensing) Connection of a bridge and plug (6-wire/TEDS)
For operation of multiple units (channels) using the exclusive carrying case, also see "6-5. EXCLUSIVE
CARRYING CASE."
MEMO
Wire colors described in figures are typical colors of
KYOWA strain gage transducer.
MEMO
NDIS connector
Green
Black
White
Red
Shield
Transducer's case
Ａ
Ｂ
ＣＤ
Ｅ
Ｆ
Ｇ
Yellow
Blue
TEDS (+)
(
-
)
NDIS connector
Green
Black
White
Red
Shield
Transducer's case
Ａ
Ｂ
Ｃ
Ｄ
Ｅ
Ｆ
Ｇ
Input
Yellow
Blue
Output
(Output voltage)
(Excitation Voltage)
(Output voltage)
(Excitation Voltage)
Output
Input

14
When the CDV/CDA-900A is to be used as a DC amplifier, connect a signal source to the NDIS connector
of the CDV/CDA-900A.
Connection diagrams are as follows.
Connection of a signal source and plug (unbalance signal) Connection of a signal source and plug (balance signal)
4-2. CONNECTION OF OUTPUT
The CDV/CDA-900A 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 connector. Use the accessory
output cable to connect an external instrument. The output
impedance*6 is rated at about 2 ohm on either terminal.
NDIS connector
+IN
-IN
Shield
Signal source
Ａ
Ｂ
Ｃ
Ｄ
Ｅ
Ｆ
Ｇ
Rs
+
-
COM
NDIS connector
+IN
-IN
Shield
Signal source
Ａ
Ｂ
ＣＤ
Ｅ
Ｆ
Ｇ
+
-
Rs
Rs
+
-
COM
BNC
connect
o
r
Connect recorder or a voltmeter