Showa 5683 User manual

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 MANUAL VER.No.1.01
ACBRIDGESYSTEMDYNAMICSTRAINAMPLIFIRE
MODELS５６８３/５６８４ 
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ＯＰＥＲＡＴＩＯＮ ＭＡＮＵＡＬ

１
INTRODUCTION
▲Before Using▼
We would like to express our thanks to you for your purchase of our product strain amplifiers
Models 5683/5684.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 Models 5683/5684amplifiers and
handling precautions. Place this manual within reach of Models 5683/5684amplifiers. If
you encounter any problems in the manuals, please contact our sales representative.
▲Examining Contents in Package▼
If opening the package in a warm room during the cold season, open the package after it has
reached room temperature to avoid any operational failure due to condensation on the
surface of the product.
The warranty does not apply for the case where damages or faults caused by use against
instructions, warnings, or cautions.
This instrument is delivered after a thorough examination at the factory prior to shipment.
However, please examine the product's condition and verify that no obvious shipping
damage has occurred after opening the package. Also, examine the specifications of the
input units and accessories. If there are any missing or damaged items, please contact our
sales representative.
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▲Cautions▼
•The contents of this manual are subject to change without notice.
•This manual is copyrighted with all rights reserved. No parts of this manual may be
transcribed or reproduced without written permission.
•Please let us know if there are any points that are unclear or missing in this manual.
•We do not assume any responsibility for the outcome of the use of Models 5683/5684
amplifiers.

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PRECAUTIONS
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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.
This indicates a condition or practice that could result in personal injury or loss of life, or may
result in light injury or physical damage if this equipment is misused due to neglect of a
Warning
This indicates a condition or practice that could result in light injury or damage to the
equipment or other property if this equipment is misused due to neglect of a Caution.
In order to avoid electrical shock or burning, confirm that no common mode voltage or
signal is applied to the signal wire when the signal wire is connected
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W
ARNING
CAUTION

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•Power Supply
Make sure that the power supply is within the rating. If any voltage exceeding the rated voltage
were 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.
•Protective Grounding
Be sure to ground this amplifier before supplying power. Grounding is necessary to use this
amplifier safely, as well as to protect the user and peripheral equipment from injury or damage.
Be sure to observe the following instructions:
1) Protective grounding
This product uses a 3-pole power cable, which has grounding. Always connect to the power
outlet having grounding. If using 3-prong/2-prong adapter, secure the grounding by connecting
either a protective terminal or a grounding lead extending from the adapter.
2) Caution on protective function
While the power is supplied to the amplifier, do not cut or remove the protective grounding line.
Otherwise, safety of the amplifier is not guaranteed.
3) Protective function failure
Avoid using this product when there is a failure in protective grounding or protective functions.
Confirm that there is no failure in the protective function before using.
•Use in Gaseous Atmosphere
Never use this amplifier in a flammable or explosive atmosphere, or atmosphere of steam. Use
in such atmosphere will result in danger to users and the amplifier.
•Disassembling the Frame
It is dangerous to remove the frame. Do not remove the frame from the amplifier other than
100VAC/200VAC switching using the selection switch.
•Input Signal Connection
Connect the signal wire to the input terminal after connecting protective grounding terminal to
the ground. When connecting the signal wire, check whether the signal wire is being properly
protected from leak signals from the environment or common-mode voltage in order to avoid
electrical shock or burning.
•Cautions during Operation
Be careful of operations because large voltage might be applied between the input terminal (input
signal wire) and ground of this amplifier or input terminal and output terminal (output signal wire).
•Installation Category and Contamination Level
Models 5683/5684 amplifiers are devices with Installation Category II and Contamination
Level II. Use them following the regulations defined in Installation Category II and
Contamination Level II.
W
ARNING

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•Caution in Handling
When using this amplifier, always follow the precautions below.
1) Users
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. Avoid storing in places where the temperature could rise over the storage
temperature and where there is direct sunlight exposure such as inside an automobile.
Do not use this recorder at the following locations.
1. Locations where the temperature and humidity rise due to direct sunlight or heaters. (The
operating environment of the amplifier; temperature: -10 to 50 °C, humidity: 20 to 85%)
2. Wet locations
3. Locations where salt, oil, or corrosive gases exist
4. Damp or dusty locations
5. Locations subject to strong vibrations
3) Cautions on power supply
1. Be careful of power voltage fluctuations. Do not use the amplifier when these are likely to
exceed the rated voltage.
2. If the power supply includes a lot of noise or high-voltage inductive noise, use noise filters
to avoid operation errors.
4) Calibration
We recommend a periodical calibration to maintain the accuracy. More reliable
measurements are possible by calibrating the amplifier once a year (extra cost option).
CAUTION

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CAUTIONINHANDLING
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Read this manual carefully before using the amplifier.
1. Do not apply neither voltage nor current to the output terminal of this amplifier from external
source.
2. Use this amplifier with power supply voltages from 85 VAC to 132 VAC, 180 VAC to 264 VAC,
or 10 VDC to 30 VDC. The AC power supply selection switch is provided inside the chassis. To
switch the AC power supply voltage, refer to page 7-4. If the power fuse is burnt, check the
cause of fuse blow-out. To replace the fuse, always disconnect the power plug and input/output
signal cable first, and then replace the fuse in the fuse holder. For how to replace fuse, see
page 7-3. When replacing, examine the ratings of fuse (e.g. for AC or DC).
3. The operation temperature and humidity of the input units is –10 to 50°C and 20 to 85%,
respectively. If opening the package in a warm room during the cold season, open the
package after it has reached room temperature to avoid any operational failure due to
condensation on the surface of the product.
Do not use this instrument at the following locations.
- High-humidity locations
- Locations with direct sunlight exposure
- In the vicinity of high-temperature heat source
- Location with vibrations
- Locations where salt, water, oil, or corrosive gases exist
４. When using many amplifier units, install fan units.
5. When a case is used to accommodate amplifiers, the case must be grounded.
6. This product uses a flash memory for saving setup values. Replacement of battery is not
needed accordingly.
7. As Models 5683/5684 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. Otherwise, noises may be generated. See 3-8 and 3-9
for details.
8.This amplifier unit uses rotary encoders are used for knobs to control functions. However,
indication position of the knob sometimes stays at the position between scale markings. In such
case, the settings upon power-up may differ from those upon turning off the amplifier. To avoid
such event, it is recommended to allow knob indication to be at the correct scale marking
position.

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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. For repair or calibration, contact our sales representative. Before returning, be sure to
inform us of the model, serial number, and problematic points. The following is our warranty.
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LIMITEDWARRANTY
1. Warranty period
Two years from our shipment.
2. Warranty limit
We will repair the defects of our product free of charge within the warranty period; however, this
warranty does not apply in the following cases.
(1) Damage or faults caused by incorrect use.
(2) Damage or faults caused by fire, earthquake, traffic accident, or other natural disasters.
(3) Damage or faults caused by a repair or modification that is carried out by someone other than a
service representative of SHOWA MEASURING INSTRUMENTS.
(4) Damage or faults caused by use or storage in environmental conditions that should be avoided.
(5) Periodical calibration.
(6) Damage or faults caused during transportation.
3. Liability
We do not assume any liabilities for equipment other than SHOWA MEASURING INSTRUMENTS.
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TABLEOFCONTENTS
INTRODUCTION
Before Using ·········································································································· 1
Examining Contents in Package ············································································ 1
Cautions ················································································································· 1
PRECAUTIONS
PRECAUTIONS········································································································ 2
Warning ··················································································································· 3
Caution ··················································································································· 4
CAUTIONS IN HANDLING
Cautions In Handling································································································ 5
WARRANTY
Warranty ················································································································· 6
Limited Warranty ···································································································· 6
TABLE OF CONTENTS ·······························································································7 to 9
1.OVERVIEW
1.1 Features ··········································································································· 1-1
1.2 Amplifier Unit and Case ··················································································· 1-1 to 1-2
1.3 Accessories ······································································································ 1-2
1.4 Block Diagram of Measurement ······································································· 1-2
1.5 Features of Dynamic Strain Amplifiers ····························································· 1-3
2. NAMES AND FUNCTIONS OF PARTS
2.1 Names and Functions of Parts on Front Panel ················································ 2-1 to 2-4
2.2 How to Set Calibration Value (CAL) ······························································· 2-5
2.3 Indication upon Balancing ················································································ 2-6
2.4 Names and Functions of Parts on Rear Panel ················································· 2-7 to 2-8
3. BEFORE MEASURING
3.1 Cable Connections ···························································································· 3-1
3.1.1 Input Cable Connections············································································ 3-1
3.1.2 Connections of Power Supply Cable and Output Cable ····························· 3-2
3.2 Operation before Measuring ··············································································· 3-2
3.2.1 Standalone Operation ··············································································· 3-2 to 3-3
3.2.2 Measurement Range ··············································································· 3-4

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3.3 Bridge Check Function ······················································································· 3-5
3.3.1 Overview ································································································· 3-5
3.3.2 Error Indication List upon Cable Disconnection and Short ························· 3-6
3.4 Cable Length Compensation Function ································································ 3-7
3.5 How to Switch Special Function Setting ······························································ 3-8
3.6 Case ················································································································· 3-9
3.6.1 Names of Case Elements ········································································· 3-9
3.6.2 How to Use Case ····················································································· 3-9 to 3-12
3.6.3 Heat Release for Case ············································································· 3-12 to 3-13
4. MEASUREMENT
4.1 Cautions before Measuring ················································································ 4-1 to 4-2
4.2 Input Connection ································································································ 4-2
4.2.1 Examples of Strain Gauge Bridge Configurations ······································ 4-2 to 4-4
4.2.2 Bridge Box ······························································································· 4-5 to 4-6
4.2.3 Measurement with Transducer ·································································· 4-7
4.3 Connection of Output to Load ············································································· 4-8
4.3.1 Connection of Output to Data Recorder ···················································· 4-8 to 4-9
4.4 How to Read Measured Values ·········································································· 4-9 to 4-10
4.4.1 Correction of Calibration (CAL) Values ······················································ 4-10 to 4-11
4.5 Special Applications ··························································································· 4-12
4.5.1 Slip Ring ·································································································· 4-12
4.5.2 Differential Transformer ············································································ 4-12
5. OPERATION THEORY
5.1 Flow of Measured Signal ·················································································· 5-1
6. OPTIONAL FUNCTIONS
6.1 Current Output (56-201 4 to 20 mA output unit) ··············································· 6-1
6.2 Case Function and Type ·················································································· 6-1
6-2-1 Accommodating amplifier units ·································································· 6-2
6-2-2 How to Mount Blank Panels ······································································ 6-2
6-2-3 Connecting Ground Wire ··········································································· 6-2
6-2-4 Cautions on Rack-mount Case ································································· 6-2
7. MAINTENANCE
7.1 Items to Be Checked ························································································ 7-1 to 7-2
7.2 How to Replace Fuse ······················································································· 7-3
7.3 Changing AC Power Supply Voltage ································································ 7-4
8.SPECIFICATIONS
8.SPECIFICATIONS ······························································································ 8-1 to 8-2

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9. REFERENCES
9.1 Frequency Characteristics and Phase Property ·················································· 9-1 to 9-2
9.2 Cable List ········································································································· 9-3 to 9-4
9.3 Dimensional outline drowing·············································································· 9-5
9.3.1 Unit ········································································································· 9-5
9.3.2 Panel cut sizes························································································· 9-6
9.3.3 Bench-top Case ······················································································ 9-7
9.3.4 Rack-mounting Case ·············································································· 9-8
9.3.5 Fan Unit ·································································································· 9-9
9.3.6 Bridge Box (5370 and 5373) ·································································· 9-10
9.3.7 Compact Bridge Box (5379 and 5380) ··················································· 9-11

１−１
１.OVERVIEW
1.1. Features
Models 5683/5684 are amplifiers that inherit the superior performance in conventional SHOWA’s amplifiers.
Moreover they feature new functions such as cable length compensation and bridge checking, realizing
higher-accuracy and higher-quality measurement and a reduction in measurement preparation time. Models
5683/5684 include an LED monitor and the auto-balancing function, thereby improving their operability. Table
1-1 introduces tow AC strain amplifiers models, Models 5683/5684,, which permit strain gauge-type
transducers to perform physical value measurement.
Another feature of Models 5683/5684 amplifiers are their lead-free and battery-less
product design. When several amplifier units are installed in a case, power supply,
auto-balancing, calibration value input, and key-locking for all amplifier units can be made by
one operation.
If you encounter any problem, read the section for maintenance, and contact with our sales
representative if the problem is not solved.
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1.2 Amplifier Unit and Case
The table blow summarizes the specifications of dynamic strain amplifiers Models 5683/5684.
The sensitivity is based on BV = 2 V.
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Multipurpose TypeMultipurpose and
High Response Type
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Model5683 Model5684
Model BV Balance Frequency Sensitivity（BV=2V） MainApplication
5683 ACV AUTO DC〜2kHz 10V/200×10-6Strain
5684 ACV AUTO DC〜10kHz 10V/500×10-6Strain StrainMeasurement
Table1-1AC StrainAmplifier
Table1-2Main S
p
ecifications for AC Strain Am
p
lifie
r

１−２
Models 5683/5684 can use the following optional devices and cases.
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Product Model Items Remarks
４〜20ｍＡOutputUnit 56-201 OUTPUT2：４〜20ｍＡ Specified upon ordering
56-104 ４ＣＨBenchCase
56-106 ６ＣＨBenchCase
Bench Top Case 56-108 ８ＣＨBenchCase
Rack-mounting Case 56-208 ８ＣＨRack-mountCase
±CAL, BAL, KEYLOCK, and batch
ON/OFF for all units are available
1.3 Accessories
¾Output cord (0311-2057) x 1
¾Time-lag fuse
(Fuse for AC power supply: 85 to 132VAC/180 to 264VAC, 100mA: 0334-3006 x 1)
(Fuse for DC power supply: 10V to 30VDC, 500mＡ: 0334-3013 x 1)
¾Screwdriver x 1
¾AC power cord (47326)
¾Instruction Manual x 1
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1.4 Block Diagram of Measurement
The following diagram illustrates a typical measurement system that broadly covers a varie
ty of factors including signal amplitude, frequencies, and measuring time.
Table1-3List of o
p
tional devices
Phenomena Sensor Instrument Recorder&Analyzer
Load
Pressure
Displacement
Acceleration
Torque
BridgeBox
StrainGauge
Strain
Models
5683/5684
Sensor
Fig.1-1Block diagram for Measuring
Oscilloscope Waveform  
DataRecorder DataRecording
DigitalVoltageMeter DigitalRecording
PenOscillograph
WaveformRec.in
LowFreq.Range
（DC〜120Hz）
ThermalDotRecorder
WaveformRec.in
HighFreq.Range
（DC〜20kHz）
DAQ
WaveformRec.in
HighFreq.Range
（DC〜100kHz）
DataProcessor Data Analysis &
Processing

１−３
1.5 Features of Dynamic Strain Amplifiers
Bridge power voltage
supply AC bridge (AC strain amplifier)
Recommended
sensors
1. Strain gauges
2. Sensors for load, displacement, acceleration, and torque
(Strain gauge-type transducers)
Features
AC strain amplifiers have higher S/N ratio and higher sensitivity than those of DC
strain amplifiers. However, for non- linearity and frequency response, AC strain
amplifiers does not exhibit higher performance. Because the AC strain amplifiers
do not include commercial power source that may generate noises in the
amplifying range, these amplifiers have high anti-noise characteristics. This
feature is advantageous in measurement using strain a gauge.
AmplifierType AC StrainAmplifier
Model 5683 5684
Voltage Sensitivity ±10V at ±200×10−6Strain ±10V at ±200×10−6Strain
Nonlinearity ±0.1% ／FS ±0.2% ／FS
Frequency Response DC 〜2kHz DC 〜10kHz
Noise 2.0×10−6Strain p-p 6.0×10−6Strain p-p
Max. Gain 50,000 20,000
Bridge Voltage AC Voltage 0.5,2V
Strain Gauge Optimum
Strain Gauge Type Transducer Adequate Adequate
Strain Measurement under the field faced with the
worrying situation of serge voltage Adequate Adequate
Long Distance between sensor and instrument Optimum
Impact Strain Inadequate Inadequate
DCAmplifier Inadequate
Table 1-4 Recommended Sensors and Features
Table1-5Choice of models

２−１
２.NAMES AND FUNCTIONS OF PARTS
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2.1 Names and Functions of Parts on Front Panel (See Table 2-1)
Number Name Function
(1) Model Model indication
(2) Level meter (17-dot LED) This level meter monitors the output voltage of OUTPUT 1
4 . The green LED at the middle turns on when the output
voltage is within ±100 mV. When the output voltage
exceeds ±10.05 V, the LED at the over-voltage side blinks.
(3) Digital monitor (Four digit 1/2) This monitor digitally displays the output voltage of
OUTPUT 2 5 . When OUTPUT2 level adjustment volume
(18) is turned clockwise, [10.000] is indicated in response
to an output of 10 V. In combination with (18), 2 kN can be
displayed as [2.000] when the transducer converting 2 kN
to 10 V is used. For decimal point shift, refer to page 3-8 .
Table 2-1 Front Panel: Names and Functions (1)
(1) (2)
(3)
(4) (5)
(6)
(7)
(8)
（９）
(10)
(11)
(12)
(13)
(14)
(16)
(15)
(17)
(18)
(19)
1
2
4
6
8
3
5
7
Fig.2-1 Front panel Fig.2-2 Rear panel

２−２
Number Name Function
Bridge check
/Cable length compensation
/Auto-balance knob (BAL)
zSee pages 3-5 to 3-7 for bridge
check and cable length
compensation
Pressing the knob performs bridge check and cable length
compensation, enabling automatic balancing of resistors
and capacitance. For details, see page 2-6 Indication upon
Balancing.
The result of bridge check is indicated on digital monitor
(3). If there is neither disconnection nor short, the indication
of Good is made, thereby making cable length
compensation (dropout rate indication) and
auto-balancing. If there is a disconnection or short, the
problematic location is repeatedly indicated. After
confirming the location, make repair. For more information
on bridge check function, see pages 3-5 and 3-6.
The capacitance balance is always offset. Whenever this
button is pressed, the resistance balance is automatically
kept accordingly.
Note: When the high-pass filter is used (High-pass filter
LED (15)lightning), even balancing is not performed,
indication of good balance (０V) is made. Therefore, do not
forget to perform balancing. When the high-pass filter is
turned on, a frequency element of 0.5 Hz or lower
including DC is deleted, which is the state of the offset
voltage cancellation.
(4)
Resistance balance fine tuning
(R-FINE)
Turning this knob clockwise moves the output to the
positive side, while turning it counter-clockwise moves the
output to the negative side.
(5) Keylock switch
(KEY LOCK）
On/Off switching for keylock can be made by pressing this
knob for one second or longer. While in the lock state,
keylock LED (6) turns on. In this state, BAL (4), measuring
range selection (8), measuring range fine tuning (9),
calibration value setting (12) and filter setting (16) cannot
be used. Pressing this knob for one second or longer
cancels the lock; keylock LED (6) also turns off.
(6) Keylock ＬＥＤ This LED indicates whether keylock is effective or not, in
that light-up for lock and light-out for unlock..
(7) Bridge power voltage LED
(BV (V))
This LED indicates the bridge power voltage (0.5 V or 2 V).
To select, use bridge power voltage selection switch 3
on the rear panel.
Table 2-1 Front Panel: Names and Functions (2)

２−３
Number Name Function
(8) Measuring range selection knob
(RANGE)
This knob is used to select the measuring range. Turing
this knob clockwise narrows the measuring range (i.e.
increasing the sensitivity). See page 3-4 for measurement
range. In this case, fine tuning is not made. [Fine tuning
LED (10) turns off.]
Measuring range fine tuning knob
(FINE)
Fine tuning is made with the knob.. Turning the 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. See measuring range LED (11). Fine tuning LED
(10) turns off upon range shift.
(9)
Speed selection
(SLOW/FAST)
Pressing this knob allows the fine tuning speed for
measurement range to switch between high speed and
low speed. Also, resistance balance fine tuning (4) is
switched between high speed and low speed.
(10) Fine tuning LED This LED turns on while fine tuning is made.
(11) Measuring range LED This LED displays measuring range from an output of
10V/200,000µεto 10V/200µε(for Model 5683)) (µε=10-6
strain). For the measuring range for Model 5684, refer to
page 3-4 Measuring Range.
(12) Calibration value setup knob
(CAL(µε)) µε=10-6 strain
Firstdigit
Seconddigit
Thirddi
g
it
Fourthdigit
Indicated value is calculated value based on input. The
value can be set from 1µεto 9999µεby a step of 1µε.
Pressing the knob changes the digit for calibration value
LED (13) and turning the knob changes values.
For further information, see page 2-5 How to Set
Calibration Value. The value the equivalent voltage value
based on a gauge factor of 2.0 and the one gauge
configuration (1mV/V=2000µε).
(13) Calibration value LED The LED displays calibration value and setting status (digit
blinking).
(14) Calibration value application switch This switch is used to input the value that is set by
calibration value setting knob (12). Pushing toward right
inputs a plus value (tension) and pushing toward left inputs
a minus value (compression). As a calibration value is
superimposed with the input signal to generate the output
voltage, return the position to OFF (middle) after inputting
the calibration value.
Table 2-1 Front Panel: Names and Functions (3)

２−４
Number Name Function
(15) High-pass filter LED This LED turns on when the high-pass filter is used.
ON./OFF for high-pass filter
(FILTER)
Pressing the knob allows the high-pass filter to switch
between ON and OFF. High-pass filter LED (15) turns on
for ON and it turns off for OFF.
Filter type: 2-pole Butterworth filter
Cut-off frequency: 0.5 Hz
(16)
Low pass filter setting knob
(FILTER)
This knob is used to set the low-pass filter. Turning the
knob allows the filter to be set to OFF (= W/B) or cut-off
frequency. The setting information is displayed on
low-pass filter LED (17).
Filter type: 4-pole Butterworth filter
Cut-off frequencies: 10, 30, 100, 300, 500 Hz, W/B (for
Model 5683)
Cut-off frequencies: 10, 30, 100, 500 Hz, 3 kHz, W/B (for
Model 5684)
(17) Low-pass filter LED This LED indicates the cut-off frequency for the low-pass
filter. W/B (wideband) signifies OFF for the low-pass filter.
(18) OUTPUT2 level control volume The output voltage for OUTPUT2 5 can be controlled
from the rating 10 V to 1 V. Control the voltage with the
attached screw driver. The output value is indicated on the
digital monitor (3). As decimal point shifting is possible
through the dip switch on the bottom face of the amplifier
unit, digital monitor (3) can be used for an indicator. For
how to shift the decimal point, refer to page 3-8.
(19) Power switch
(POWER)
Pressing this switch supply the power to the amplifier unit.
The power is turned off by pressing this button again.
Table 2-1 Front Panel: Names and Functions (4)

２−５
2.2 How to Set Calibration Value (CAL)
The indicated value is calculated value based on input. The value can be set from 1µεto 9999µε
by a step of 1µε(=10-6). Values should be set for each digit (Figure 2-3). Pressing calibration
value setting knob (12) (Figure 2-4) turns on the fourth digit of calibration value LED (13). Turning
the switch changes the value on (13). Even the indication is blinking, the setting is being made.
Press the knob when your target value is indicated. In this case, blinking of (13) turns to lightning
(value fixed), and then the third digit starts blinking. Repeat this step up to the first digit. After the
first digit turns on and then all digits turns on, calibration value setting completes. To change the
calibration value, repeat the steps above. The value is based on the equivalent value for gauge
factor 2.00 and one gauge configuration. For strain gauge-type transducer, set and calculate the
value based on 1mV/V=2000µε.
■Calibration value setting
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E.g. To convert Calibration value (CAL) from 2000µεto 5000µε
Fig.2-3 Calibration value (CAL)
The fourth di
g
it blinks.
Press calibration setting knob (12) Turn calibration setting knob (12)
to set the value to 5. Press (12).
Indication 0 at the first digit
blinks. Press (12) once as a
value change for the first digit
is not necessary.
Fig.2-4
Four digits turn on. The
setting completes
Indication 5 at the fourth digit turns
on and 0 at the third digit blinks.
Press (12) twice as value changes
for the third and second digits are
not necessary.
Forstraininput(µε)
Calibrationvalue
(CAL)settingrange ForthDigit ThirdDigit SecondDigit FirstDigit
1to9999 0123456789 0123456789 0123456789 0123456789
Firstdigit
Seconddigit
Thirddigit
Fourthdigit

２−６
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). The indication continues until the BAL knob is pressed for five seconds or longer or
the power of amplifier is turned off. Make repair following the indication. When bridge check is not
effective (OFF), the portions enclosed by broken line are omitted, executing auto-balancing. For
how to set these functions to ON or OFF, refer to page 3-8 How to Switch Special Function
Setting.
Fig.2-5 Block diagram
for balance operation
or
Push BAL. knob.
Display bridge check
Checking AB line Checking BC line Checking CD line Checking DA line
No disconnection or short Disconnection or short
Repeatedly showing until
BAL knob being pressed
Example of Indication: When there are
disconnections at AB and DA on the bridge
Disconnection in AB on bridge Disconnection in DA on bridge
Disconnection on wire A
No disconnection or short : Good
Repair of bridge cable or
replace sensor
Press BAL knob for five
seconds or longer
Recheck wiring
Bridge check : ON
Cable Length Compensation Check : ON
Indicating dropout rate
Cable length
Compensation check
Auto Balance

２−７
2.4: Names and Functions of parts on Rear Panel (See Table 2-2)
Number Name Function
1 Input connector (INPUT) The bridge box or a transducer is connected.
2 Synchronization selection switch
(OSC)
This switch is use to set the settings for bridge power
voltage circuit included in the amplifier.
INT: Set to be the master, using internal circuit
EXT: Set to be a slave, allowing this unit to synchronize
with the master’s bridge power voltage circuit
When the amplifier is used in a stand-alone, always set the
switch to INT. When a case is used, the synchronous
signal is supplied through in-case wiring. The amplifier unit
whose setting is set to be INT is the master; therefore,
other units should be set to EXT. For more details, see
page 3-9 Synchronization among Units.
3 Bridge power voltage selection switch
(BV)
Selection of power voltage applied to the bridge can be
switched (0.5 V or 2.0 V).
(1) (2)
(3)
(4) (5) (6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(16)
(15)
(18)
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2
4
6
8
3
5
7
(19)
(17)
Fig.2-1 Front panel Fig.2-2 Rear panel
Table 2-2 Rear Panel: Names and Functions
(
1
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