KYOWA MRS-100 Series User manual

IM-A-1271 Dec. 2019
INSTRUCTION MANUAL
MRS-100 Series
Digital Telemeter
MRS-114A
MRS-104A-S
MRS-101A-S
MRS-101A-SE
MRS-101A-V
Thank you for purchasing KYOWA’s product MRS-100 Series.
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.
We assume no responsibility whatever for any damage resulting from the use of this product.

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CONTENTS
CONTENTS ··············································································································· 1
SAFETY PRECAUTIONS (Do not forget to read the safety precautions prior to use.)························ 4
LIMITED LIDE PARTS AND PREVENTIVE MAINTENANCE················································ 7
MRS-100 Series REPLACEMENT BEFORE THE END OF SERVICE LIFE ································· 7
NOTATIONS USED IN THE INSTRUCTION MANUAL ························································ 7
1. OUTLINE OF PRODUCT ··························································································10
1-1. OUTLINE·························································································································· 10
1-2. FEATURES ························································································································ 10
1-3. Combination models·············································································································· 11
2. CONTROLS AND FUNCTIONS ··················································································12
2-1. 1ch-Receiver······················································································································· 12
2-1-1. FRONT PANEL·············································································································· 12
2-1-2. REAR PANEL ··············································································································· 21
2-2. Transmitter ························································································································· 22
3. Wiring method·········································································································28
3-1. Receiving antenna················································································································· 28
3-2. Transmitting antenna·············································································································· 28
3-4. Wiring method of the transmitter ······························································································· 31
4. Measuring Mode and Command Mode············································································34
4-1. Telemeter operating modes ······································································································ 34
5. Actual Operation ······································································································37
5-1. Operations before measurement································································································· 38
6. Transmitter power supply····························································································42
6-1. Transmitter recommended battery ······························································································ 42
6-2. LEDs lighting conditions for monitoring transmitter power supply voltage·············································· 43
6-3. Estimated operating time of the recommended battery (If using the MRS-104A-S) ···································· 44
6-4. Estimated operating time of the recommended battery(If using the MRS-101A-S/SE) ································ 47
6-5. Estimated operating time of the recommended battery(If using the MRS-101A-V) ···································· 50
7. Supplementary System Information················································································53
7-1.Antenna installation guide ······································································································· 53
7-2. Reception system using two receiving antennas (diversity reception techniques)······································· 59
7-3. Using the extension cable for the receiving antenna ········································································· 61
7-4. OPTIONALACCESSORIES ··································································································· 62
7-5. Radio interference················································································································· 63
7-6. Usage examples ··················································································································· 64
8. SPECIFICATIONS ···································································································65
8-1. MRS-114A ························································································································· 65
8-2. MRS-104A-S (4ch-Strain Transmitter) specifications······································································· 67
8-3. MRS-101A-S (1ch-Strain Transmitter) specifications······································································· 69
8-4. MRS-101A-SE (1ch-Strain Transmitter(EXTAntenna)) specifications··················································· 70
8-5. MRS-101A-V (1ch-Voltage Transmitter) specifications····································································· 71
8-6. MRS-10B (Setting Software) specifications ·················································································· 72
8-7. OUTSIDE DRAWING ··········································································································· 73
8-7-1. MRS-114A (4ch-Receiver)································································································· 73
8-7-2.MRS-104A-S（4-ch Strain Transmtter）················································································ 74
8-7-3. MRS-101A-S (1ch-Strain Transmitter)··················································································· 75
8-7-4. MRS-101A-SE (1ch-Strain Transmitter(EXTAntenna)) ······························································ 76
8-7-5. MRS-101A-V (1ch-Voltage Transmitter) ················································································ 77
8-7-6. DA-DB-05RP-SMA-08（High gain dipole antenna）································································ 78
8-7-7. Fastening bracket ············································································································ 79

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This Manual describes hardware operation of the MRS-114A, MRS-104A-S, MRS-101A-S, MRS-101A-SE and the
MRS-101A-V.
The instruction manual in other available languages can be found at
https://www.kyowa-ei.com/eng/support/download/manual/acquisition/index.html
The following accessories are packed with the MRS-114A.
When unpacking, check the contents to ensure that all accessories are enclosed.
STANDARD ACCESSORIES
Setting Software (MRS-10B) ································································· 1 (CD-R)
BNC-BNC cable (U-59) ······································································· 4
USB cable (N-38)··············································································· 1
AC adapter* ····················································································· 1
Ground wire (P-72)············································································· 1
Receiving antenna (W1030)··································································· 2
High gain dipole antenna (DA-DB-05RP-SMA-08)······································· 2
Extension cable for receiving antenna (2m) (E-02) ······································· 2
Side hole suction cup (55mm) ································································ 2
Cable tie·························································································· 2
Product Warranty ··············································································· 1
*AC power cable is optional (select according to the country or region of use).
OPTIONALACCESSORIES
AC power cable:
P-38 (Japan), P-39 (U.S.A.), P-40 (India), P-41 (Europe), P-42 (Thailand)
Small planarantenna (EXT-ANT1)
Planar diversity antenna (EXT-ANT2)
Extension cable for receiving antenna (6 m) (E-0)3*
DC power cable (2m) (P-76)
*E-03 cannot be used in Europe.
The following accessories are packed with the MRS-104A-S.
When unpacking, check the contents to ensure that all accessories are enclosed.
STANDARD ACCESSORIES
Fastening bracket ··············································································· 2
Full-bridge Adapter (ADP-401)* ··························································· 2
Power Adapter (ADP-40P)* ································································· 1
JCIS10-70 Miniature Screw (M2x4)* ······················································· 3
Battery holder (AAA cell×2) for checking operation (SBH4211AS) ··················· 1
ID label··························································································· 1
Product Warranty ··············································································· 1
*Attached to the transmitter body
OPTIONALACCESSORIES
Quarter-bridge 2-wireAdapter (120 ohm) (ADP-402-120)*
Quarter-bridge 3-wireAdapter (120 ohm) (ADP-403-120)*
* One adapter is available for 2 channels measurements.
(Two adapters are required to measure 4 channels.)

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The following accessories are packed with the MRS-101A-S.
When unpacking, check the contents to ensure that all accessories are enclosed.
STANDARD ACCESSORIES
Adapter board (ADP-01)*····································································· 1
JCIS10-70 Miniature Screw (M2x4)* ······················································· 1
Battery holder (AAA cell×2) for checking operation (SBH4211AS) ··················· 1
ID label··························································································· 1
Product Warranty ··············································································· 1
*Attached to the transmitter body
OPTIONALACCESSORIES
Quarter-bridge 2-wireAdapter (120 ohm) (ADP-02-120)
The following accessories are packed with the MRS-101A-SE.
When unpacking, check the contents to ensure that all accessories are enclosed.
STANDARD ACCESSORIES
Adapter board (ADP-01)*····································································· 1
JCIS10-70 Miniature Screw (M2x4)* ······················································· 1
Battery holder (AAA cell×2) for checking operation (SBH4211AS) ··················· 1
External antenna (W1030)····································································· 1
Antenna harness (E-04)········································································ 1
ID label··························································································· 1
Product Warranty ··············································································· 1
*Attached to the transmitter body
OPTIONALACCESSORIES
Quarter-bridge 2-wireAdapter (120 ohm) (ADP-02-120)
The following accessories are packed with the MRS-101A-V.
When unpacking, check the contents to ensure that all accessories are enclosed.
STANDARD ACCESSORIES
Voltage Adapter (ADP-03)*··································································· 1
JCIS10-70 Miniature Screw (M2x4)* ······················································· 1
Battery holder (AAA cell×2) for checking operation (SBH4211AS) ··················· 1
ID label··························································································· 1
Product Warranty ··············································································· 1
*Attached to the transmitter body

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SAFETY PRECAUTIONS (Do not forget to read the safety precautions prior to use.)
The MRS-114A is designed to be used according to "SPECIFICATIONS". Do not use the product in an environment
exceeding the specifications. Or, it may cause troubles.
PRIOR TO USE
For safe use of the product, do not forget to read the "SAFETY PRECAUTIONS" prior to use.
KYOWA assumes no liability for any damage resulting from the user's failure to comply with the safety precautions.
For safety operation of the product, the following symbol marks are used in the Instruction Manual.
Indicates "PROTECTIVE GROUND TERMINAL".
Be sure to connect the GND terminal to the ground.
SAFETY SYMBOLS
For safety operation of the product, 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.
WARNING
●Warning
Be sure to observe the safety precautions described in the MRS-114A Instruction Manual.
●Power supply
To prevent a fire hazard, ensure that the power supply voltage specified for the product matches the local line
voltage before connecting the system to the power supply.
●Avoid using in environment with inflammable gas, etc.
To prevent the risk of fire hazard or explosion, do not use the product in environment with inflammable gas,
vapor, or dust.
●If any trouble occurs
To prevent a fire hazards, if smoke is emerging from the product, immediately disconnect the USB cable orAC
adapter to terminate the system operation.
●Protective ground
Be sure to connect the GND terminal to the ground. Or, it may cause an electric shock hazard, lower the
performance, and cause trouble.
●To avoid secondary system damage from product failure, always follow a maintenance plan with separate
technical measures.
●Never use the product in medical facilities.
Doing so may interfere with medical devices, posing a life-threatening risk.
●Never use the product at airports or in aircrafts.
Doing so may cause airport equipment to malfunction, posing a life-threatening risk.
●Do not use the product where use of wireless devices, such as mobile phones, is prohibited.

5
CAUTION
●Caution
Be sure to observe the safety precautions described in the MRS-114A Instruction Manual.
●Do not turn ON the power switch immediately after turning it OFF.
After turning OFF the power switch, wait (5 seconds) until the power supply is shut OFF before turning ON the
power switch again.
To disconnect the product, turn controls to off, then remove plug from wall outlet.
●Use within the operating temperature range.
Use at temperatures exceeding the specified range may lower the performance and cause trouble.
●Use within the operating humidity range (however, without condensation).
Use in a humid place exceeding the specified range or where it is exposed to splashing water may lower the
performance and cause trouble.
●Use the product at the altitude up to 2,000m.
●Do not use the product immediately when the ambient temperature and humidity change suddenly.
Leave the product as it is until it becomes adaptable to the environment.
Abrupt change in ambient temperature due to transportation, etc. may cause dew condensation, which may result
in lower performance and troubles.
●Use the product under environment without excessive vibration or high impact.
Use the product in an area where vibration and impact can be kept within the scope of specifications.
Continuous vibration or severe impact may cause deteriorated performance and system failure.
In case of installing the product at high place, prepare enough measures for prevention of its drop.
●This product operates on the 2.4 GHz band, which wireless LAN, Bluetooth®, and microwave ovens also use.
Devices on the wireless LAN or on other radio waves may generate electromagnetic interference that causes
wireless communication errors in this product.
Before using this product, check to confirm that there are no such devices nearby.
In addition, note that the wireless LAN and Bluetooth®functions of the computer on which the Setting Software
for this product is installed may generate electromagnetic interference. When controlling this product via the
computer, turn off the computer’s wireless LAN and Bluetooth®functions.
Use the product as far away from other signal lines and noise sources as possible, in order to prevent it from
malfunctioning due to noise.
Keep this product far away as possible from equipment which generates strong electromagnetic wave.
●Do not use the product under poor conditions.
Operate the product within the range of power supply specs. The power supply used for the product should not
experience an instantaneous power failure and be free from noise.
●Do not pull cords and cables.
Lay cords and cables with a certain allowance so that unreasonable force is not applied to the connections.
Or, it may interrupt the measurements, break the cables, and damage the connectors.
●Avoid installing sensors and products near a welding machine. Failure to do so will pose the risk of erroneous data,
malfunction and failure.
●Do not disassemble or remodel the product. Or, it may cause electric shock hazards or damage the product. This
warranty does not cover any damaged or defective parts that results from disassembling or remodeling.
●Do not use or storage the product under dusty or fine particles or corrosive gas environment.
Use or storage under these environments, may result in lower performance and troubles.
●Do not expose the product to the air if it is used and stored nearby sea. Air exposure nearby sea may cause lower
performance and products failure.
●Take care when handling the CD-R.
Do not expose the CD-R to direct sun light, high temperature, or high humidity.
Do not apply pressure to the CD-R by laying object or bending.
Dust, scratches, and fingerprints on either side of the CD-R can cause write errors.

6
●Preheat the product before use.
After the power ON, always preheat the product for approximately 1 hour.
●Cleaning.
When the product gets dirty, clean the product with a dry soft cloth. When dust exists inside the MRS-114A,
clean it by using an air blow gun. Do not touch electronic parts.
●Do not use the products (MRS-104A-S, MRS-101A-S, MRS-101A-SE or MRS-101A-V) outside, in a humid place
where it is exposed to splashing water without conducting the waterproof trearment to the transmitter, battery and
wiring.
●Do not place the products (MRS-104A-S, MRS-101A-S, MRS-101A-SE or MRS-101A-V) on an uneven surface.
●When installing the transmitter on a rotating body, install a safety cover to secure safety from blown parts.
●Turn off the transmitter, when removing the External antenna andAntenna harness from it.

7
Reference items required when handling the product.
Essential precautions required when handling the product.
LIMITED LIDE PARTS AND PREVENTIVE MAINTENANCE
The product 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
product, resulting in a malfunction or a failure.
Limited life parts used with the product are as follows.
○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 product.
○ AC adapter (optional accessories)
Heat and smoke will be emitted, resulting in an unstable voltage.
To operate the product normally, finding a sign of the product failure early by daily/periodic inspections and taking the
corrective action are required. For inspection, contact KYOWA or our representatives.
* Limited life parts used with the product are aluminum electrolytic capacitor.
*All components do age and will fail.
MRS-100 Series 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 product. Regardless of the replacement parts, the product itself gradually deteriorates with age. Before
the expected service life is reached, consider replacing the product with a new one or the latest series as preventive
maintenance.
NOTATIONS USED IN THE INSTRUCTION MANUAL
The following notations are used in the Instruction Manual for convenience.
•Names described on the panel surface
Names described on the panel surface are expressed in double quotation mark " ".
•Informational notes
Certain notations are used as necessary to attract your attention to information that requires special care when
handing the product, and to information provided for reference purposes.
Examples of Notations.
NOTE
MEMO

8
IMPORTANT REGULATORY INFORMATION
The product is for use only in Japan, the United States, India, Thailand and the European Union.
Use in other countries or regions is prohibited.
JAPAN
Type certification
The product has been certified as a low-power data communications system in the 2.4 GHz band
(Technical Regulations Conformity Certification System: Ordinance of MPT No. 37, 1981,Article 2,
paragraph 1, item (19)) according to the Radio Law of Japan.
Accordingly, no radio equipment license is required to use this product. However, the following actions
may be punishable under law:
•Disassembling or modifying the product.
•Removing the certification label on the product.
Name of radio equipment: MR-2400M Number of type certification: 007-AE0235
FCC
COMPLIANCE WITH ELECTRIC DIRECTIVES & REGULATIONS
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
[CAUTION]
Changes or modifications not expressly approved by the party responsible for compliance could void
the user’s authority to operate the equipment.
Contains Transmitter Module
FCC ID: 2AJE9, MR-2400MA
This device should be used EXCLUSIVELY as the digital devices for industrial, commercial or medical
test equipment. "Test equipment" includes devices used for maintenance, research, evaluation,
simulation and other analytical or scientific applications in areas such as industrial plants, public
utilities, hospitals, universities, laboratories, automotive service centers and electronic repair shops.
INDIA
REGULATORY NOTRICE FOR Radio Frequency module
•Notice for users in India
The name of RF module: MR-2400MA
THAILAND
REGULATORY INFORMATION in Thailand
NOTE

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EUROPEAN UNION
Hereby, Kyowa Electronic Instruments Co., Ltd., declares that each equipment of the MRS-100 series
is in compliance with Directive 2014/53/EU in countries of the European EconomicArea (EEA) and
EFTA countries (Iceland, Norway, Liechtenstein, Switzerland) and Turkey.
English
This equipment is in complience with the essential requirements and other
relevant provisions of Directive 2014/53/EU.
Česky
[Czech]
Toto zařízení je v souladu se základními požadavky a ostatními odpovídajícími
ustanoveními Smérnice 2014/53/EU.
Deutsch
[German]
Dieses Gerät entspricht den grundlegendenAnforderungen und den weiteren
entsprecheneden Vorgaben der Richtlinie 2014/53/EU.
Español
[Spain]
Este equipo cumple con los requisitos esenciales asi como con otras
disposiciones de la Directive 2014/53/UE.
Français
[France]
Cet appareil est conforme aux exigencies essentialles et aux autres dispositions
pertinantes de la Directive 2014/53/UE.
Ελληυική
[Greek]
Αυτός ο εξοπλισμός είναι σε συμμόρφωση με τις ουσιώδεις απαιτήσεις και
άλλες σχετικές διατάξεις της Οδηγίας 2014/53/EE
Italiano
[Italian]
Questo apparato é conforme ai requisiti essenziali ed agli altri principi sanciti
dalla Direttiva 2014/53/UE.
Magyar
[Hungarian]
Ez a készülék teljesíti az alapvetőkövetelményeket és más 2014/53/EU
irányelvben meghatározott vonatkozó rendelkezéseket.
Nederlands
[Dutch]
Dit apparaat voldoet aan de essentiele eisen en andere van toepassing zijnde
bepalingen van de Richtlijn 2014/53/EU.
Norsk
[Norwegian]
Dette utstyret er i samsvar med de grunnleggende krav og andre relevante
bestemmelser i EU-directiv 2014/53/EU.
Română
[Romanian]
Acest echipament este in conformitate cu cerintele esentiale si cu alte prevederi
relevante ale Directivei 2014/53/UE.
Slovensky
[Slovak]
Toto zariadenie je v zhode so základnými požiadavkami a inými príslušnými
nariadeniami direktív: 2014/53/EU.
Suomi
[Finnish]
Tämä laite täyttää direktiivin 2014/53/EU olennaiset vaatimukset ja on siinä
asetettujen muiden laitetta koskevien määräysten mukainen.
Svenska
[Swedish]
Denna utrustning är i överensstämmelse med de väsentliga kraven och andra
relevanta bestämmelser i Direktiv 2014/53/EU.
The full declaration of conformity for this product can be found at
http://www.kyowa-ei.com/eng/company/environment/eu_declaration.html.
The maximum RF power is below:
The band 2405 - 2480 MHz is 4.0dBm
When mounting the product in customersr systems, it is required to proceed additional certification
processes before placing on the market in EU member states to make customers products fully comply
with relative EU standards.
Kyowa can provide a test report of conducted measurement portion for the radio module to customers.
Customers can utilize the test report for the certification processes of own systems as it requires radio.
NOTE

10
1. OUTLINE OF PRODUCT
1-1. OUTLINE
Wireless measurements (telemeters) have long been desired to measure the torque of rotation shafts or to measure
data at a place where wiring is difficult. The MRS-100 series is a telemeter to meet the strict system requirements
and conditions (vibration resistance, impact resistance, small size for narrow space, high stability over the wide
operating temperature range, low current consumption to get long time battery usage, and high-speed sampling).
1-2. FEATURES
●Telemeter that supports a maximum of 4-ch analog I/O
●Radio-signal condition inspection by the dedicated Setting Software.
●Easy operation without PC after initial settings.
●RSSI checking, transmitter’s battery voltage checking, and communication error checking.
●Diversity receiving system.
(Dual antennas improve the communication reliability.)

11
1-3. Combination models
MRS-114A (4ch-Receiver) is used in combination with MRS-104A-S, MRS-101A-S (1ch-Strain Transmitter),
MRS-101A-SE (1ch-Strain Transmitter (EXTAntenna)). or MRS-101A-V (1ch-Voltage Transmitter).
Connect to a power supply that matches the power specifications.
Receiver
Transmitter
MODEL
Product name
MODEL
Product name
MRS-114A
4ch-Receiver
MRS-104A-S
4ch-Strain Transmitter
MRS-101A-S
1ch-Strain Transmitter
MRS-101A-SE
1ch-Strain Transmitter
(EXTAntenna)
MRS-101A-V
1ch-Voltage Transmitter
Do not use the MRS-10A for the MRS-114A.
If already using MRS-10A, uninstall MRS-10A, upgrade to MRS-10B, and then respecify the
Transmitter and Receiver [Pairing settings].
For details, see the MRS-10B instruction manual.
The latest version of MRS-10B can be downloaded from our company’s website.
NOTE
The MRS-10B software Ver. is displayed on the titlebar.
MEMO
The Transmitter and Receiver Firmware Ver. can be confirmed from MRS-10B.
The Transmitter and Receiver Firmware Ver. can be confirmed by clicking the [Receiver Information]
button in the case of the MRS-114A, or by clicking the [Transmitter Information] button on the
[Transmitter Settings] tab in the case of the MRS-104A-S or MRS-101A-S/SE/V.
MEMO

12
2. CONTROLS AND FUNCTIONS
2-1. 1ch-Receiver
2-1-1. FRONT PANEL
a) POWER switch
" ○" position: Power OFF , " | " position: Power ON
b) "DC.IN" connector (RM12BRD-4PH)
Connects to the power supply.
Use either the includedAC adapter or an external DC power supply to provide 10 to 16 V DC power.
Receptacle (Receiver Side) : RM12BRD-4PH (HIROSE)
Plug (Cable Side) : RM12BPG-4S (HIROSE)
Pin No.
Signal Name
1
Positive(+) power supply
2
Positive(+) power supply
3
Negative(-) power supply
4
Negative(-) power supply
c) "USB" connector
Connector for the USB interface
Can be connected to a PC on which the Setting Software is installed.
d) "Frequency CH" LED
Indicates one of 16 channel numbers (0–9, A–F) currently set.
The default is "F".
e) "MUTE" switch, "MUTE" LED
Can be pressed to switch the buzzer on/off.
When the "MUTE" switch is set to on, the "MUTE" LED lights up in green, and the buzzer does not sound.
The "MUTE" switch can be switched in either Command Mode or Measuring Mode.
Immediately after starting up the product, the "MUTE" switch is set to off. The buzzer sounds for three seconds if
a wireless communication error occurs even in a single packet.
"MUTE" LED
buzzer
Green(Light up)
OFF
Light out
ON
c)
n)
o)
l)
m)
e)
j)
i)
h)
g)
b)
a)
d)
f)
k)
"1"
"2"
"3"
"4"
(Enlarged view)
"DC.IN" connector

13
f) "DATA" LED
Indicates the wireless communication status.
•Lights up in green for normal wireless communication.
Remains lit in green while in Measuring Mode during normal wireless communication.
•Lights up in red for three seconds if a wireless communication error occurs even in a single packet.
g) "LOCK" LED
Lights up in green when the product enters Measuring Mode. (Measuring Mode begins when the "START" switch
is pressed and the "START" LED is lit.)
In Measuring Mode, no switches other than "STOP" and "MUTE" are available.
h) "Transmitter’s battery voltage checking" LED
Indicates the transmitter power supply level in four levels by lighting up zero to three of the LEDs.
For more information, refer to "6. Transmitter power supply."
LED illumination settings can be changed using the Setting Software.
For instructions, refer to the MRS-10B instruction manual.
LED Display
Power Level
●●●
High
↑
↓
Low
●●●
●●●
●●●
i) "RSSI( Received Signal Strength Indicator )" LED
Indicates RSSI from the transmitter in four levels by lighting up zero to three of the LEDs.
Serves as a guideline when finding the best place for installation.
For stable wireless communication, choose an installation location where three "RSSI" LEDs are lit.
The receiver receives data via both "MAIN" and "SUB" antennas but prioritizes data received from the "MAIN"
antenna.
"ANTENNA SUB" data is used in case a wireless communication error occurs in the "ANTENNA MAIN" data to
reduce the data defect rate.
LED
Display
Description
RSSI
This is the recommended level.
Strong
↑
↓
Weak
Try to install the product in a different location with a better wireless signal.
Environments susceptible to wireless communication errors. Install the
product in a different location.
Environments where connecting to wireless communication is difficult. Install
the product in a different location.
●Packetizing measurement data
The transmitter groups sampled measurement data into packets, each of which contains a certain
quantity of data, and sends them intermittently by wireless communication.
MEMO

14
j) "BAL" switch, "BAL" LED
The "BAL" switch is for Balance adjustment and is available in Command Mode.
If using the MRS-104A-S (4ch-Strain Transmitter), MRS-101A-S (1ch-Strain Transmitter) or MRS-101A-SE
(1ch-Strain Transmitter (EXTAntenna))
Pressing the switch negates the transmitter’s bridge unbalance value and performs Balance adjustment. The
specification for the Balance Adjustment Range is ±10000×10-6 strain, but the product is designed to support
Balance adjustment of approximately ±14000×10-6 strain.
In the case of the MRS-104A-S (4ch-Strain Transmitter), the measurement channels with balance adjustment
are implemented.
In the case of the MRS-101A-S (1ch-Strain Transmitter) or MRS-101A-SE (1ch-Strain Transmitter (EXT
Antenna)), only CH1 is implemented. (CH2 to CH4 are not implemented.)
•When Balance adjustment is successful:
1) When the "BAL" switch is pressed, both the "BAL" LED and "DATA" LED of the measurement channels
with balance adjustment light up in green.
2) The "BAL" LED remains lit in green, the "DATA" LED turns off, and Balance adjustment is complete.
Because the bridge unbalance value is negated, the receiver’s analog output becomes approximately 0 V.
•When Balance adjustment fails (due to poor sensor connection, etc.):
1) When the "BAL" switch is pressed, both the "BAL" LED and "DATA" LED of the measurement channels
with balance adjustment light up in green.
2) The "BAL" LED turns red, and the "DATA" LED turns off.
Because the bridge unbalance value cannot be negated, the receiver’s analog output remains as the bridge
unbalance value.
When no bridge is connected to the transmitter, the receiver’s analog output is approximately -5.4 V
(negative saturation voltage).
•When a wireless communication error occurs during Balance adjustment:
1) When the "BAL" switch is pressed, the "BAL" LED flashes in green.
2) The "DATA" LED lights up in red, and the buzzer sounds.
(The buzzer does not sound if "MUTE" is off.)
3) Both the "BAL" LED and "DATA" LED turn off.
Because Balance adjustment was not performed, the receiver’s analog output does not change.
"BAL" LED
"DATA" LED
Receiver Analog Output
Status
Lit in green ●
Lit in green ●
(Lit for three
seconds)
Approximately 0 V
output
•If Balance adjustment is successful
Lit in red ●
Lit in green ●
(Lit for three
seconds)
Output of a value
corresponding to the
bridge unbalance value
•If Balance adjustment fails
Flashing in green ●
↓
Off ●
Lit in red ●
(Lit for three
seconds)
No change
•If Balance adjustment cannot be
performed
Try again in an environment that enables
normal wireless communication.
The receiver receives via both "MAIN" and "SUB" antennas but prioritizes data received from "MAIN."
For this reason, even if there are no wireless communication receiving errors, the "RSSI" LEDs may
switch between all lit and off depending on the sending/receiving environment.
This situation occurs when there is minimal "MAIN" RSSI (enough to avoid receiving errors) but ample
"SUB" RSSI (LEDs all lit).
In this case, adjust the "MAIN" antenna direction or take other measures to improve RSSI.
MEMO

15
If using the MRS-101A-V (1ch-Voltage Transmitter)
Pressing the switch negates the transmitter’s initial input voltage value and performs Balance adjustment.
The specification for the Balance adjustment range is ±5 V, but the product is designed to support Balance
adjustment of about ±6 V.
Only CH1 is implemented. (CH2 to CH4 are not implemented.)
•When Balance adjustment is successful:
1) When the "BAL" switch is pressed, both the "BAL" LED and "DATA" LED light up in green.
2) The "BAL" LED remains lit in green, the "DATA" LED turns off, and Balance adjustment is complete.
Because the initial input voltage value is negated, the receiver’s analog output becomes approximately 0 V.
•When Balance adjustment fails (When its value is outside the BalanceAdjustment Range):
1) When the "BAL" switch is pressed, both the "BAL" LED and "DATA" LED light up in green.
2) The "BAL" LED turns red, and the "DATA" LED turns off.
Because the initial input voltage value cannot be negated, the receiver’s analog output corresponds to the
input voltage to the transmitter.
•When a wireless communication error occurs during Balance adjustment:
1) When the "BAL" switch is pressed, the "BAL" LED flashes in green.
2) The "DATA" LED lights up in red, and the buzzer sounds.
(The buzzer does not sound if "MUTE" is off.)
3) Both the "BAL" LED and "DATA" LED turn off.
Because Balance adjustment was not performed, the receiver’s analog output does not change.
"BAL" LED
"DATA" LED
Receiver Analog Output
Status
Lit in green ●
Lit in green ●
(Lit for three
seconds)
Approximately 0 V
output
•If Balance adjustment is successful
Lit in red ●
Lit in green ●
(Lit for three
seconds)
Output of a value
corresponding to the
initial value
•If Balance adjustment fails
Flashing in green ●
↓
Off ●
Lit in red ●
(Lit for three
seconds)
No change
•If Balance adjustment cannot be
performed
Try again in an environment that enables
normal wireless communication.
For absolute voltage measurement and relative voltage measurement, caution is required for Balance
Execution and the Connection Method.
For details, see "MRS-101A-V (1ch-Voltage Transmitter) READ IN THE BEGINNING."
NOTE

16
k) "CHECK" switch, "CHECK" LED
The "Check" switch is for checking the sensor and is available in Command Mode.
The bridge resistance value to be used must be entered in the Setting Software.
If using the MRS-104A-S (4ch-Strain Transmitter), MRS-101A-S (1ch-Strain Transmitter) or MRS-101A-SE
(1ch-Strain Transmitter (EXTAntenna))
Pressing the switch produces approximately +2.5 V of analog output from the receiver for five seconds.
Perform checking after successful Balance adjustment (after pressing the "BAL" switch).
In the case of the MRS-104A-S (4ch-Strain Transmitter), the measurement channels with the sensor check are
implemented.
In the case of the MRS-101A-S (1ch-Strain Transmitter) or MRS-101A-SE (1ch-Strain Transmitter (EXT
Antenna)), only CH1 is implemented. (CH2 to CH4 are not implemented.)
•When the sensor check is successful:
1) When the "CHECK" switch is pressed, both the "CHECK" LED and "DATA" LED light up in green.
2) After the "DATA" LED turns off, the "CHECK" LED turns off and checking ends.
While the "CHECK" LED is lit in green, approximately +2.5 V of analog output is produced from the
receiver for five seconds.
•When the sensor check fails (due to poor sensor connection, etc.):
1) When the "CHECK" switch is pressed, the "CHECK" LED lights up in red and "DATA" LED in green.
2) After the "DATA" LED turns off, the "CHECK" LED turns off and checking ends.
Analog output from the receiver does not change.
•If a wireless communication error occurs when checking starts:
1) The "CHECK" LED flashes twice.
2) The "DATA" LED lights up in red, and the buzzer sounds.
(The buzzer does not sound if "MUTE" is off.)
3) Both the "CHECK" LED and "DATA" LED turn off, and the operation ends without checking.
"CHECK" LED
"DATA" LED
Receiver Analog Output
Status
Lit in green ●
↓
Off ●
Lit in green ●
(Lit for three
seconds)
For approximately five
seconds
Approximately 2.5 V
output
•If the sensor check is successful
Lit in red ●
↓
Off ●
Lit in green ●
(Lit for three
seconds)
No change
•If the sensor check fails
Recheck the sensor connection, etc.
Check to confirm that the value used does
not differ greatly from the bridge
resistance value set in the Setting
Software.
Flashing in green ●
↓
Off ●
Lit in red ●
(Lit for three
seconds)
No change
•If the sensor check cannot be performed
Try again in an environment that enables
normal wireless communication.
In
approximately
Seven seconds
In
approximately
Seven seconds

17
●Conditions for a successful sensor check
Sensor checking uses the tip parallel resistance method, as shown in the following bridge schematic diagram. The
transmitter incorporates a parallel resistance value (Rs) and switch. Turning on the switch increases strain output.
When this increase is within the range indicated in the last line of the following table, the sensor check is
successful.
Description
Remarks
Rg
bridge resistance
Rg≒Rg1≒Rg2≒Rg3≒Rg4
The bridge being used must be entered in
the Setting Software.
Rs
Parallel resistance value
Rs = 361 kohm (in the transmitter)
k
Gage Factor
k = 2.00
St
Generating strain value
based on tip parallel
resistance method
SW
Switch for sensor check
On when a sensor check is performed
(Switch is in the transmitter)
St0
sensor check
Strain output when off
When sensor check is off
(Strain output for normal measurement)
St1
sensor check
Strain output when on
When sensor check is on
(Switch is on [shorted])
St1–St0
Increased strain output
value
Additional strain output when a sensor
check is performed
Conditions for a successful sensor check: 0.7 × St < St1 − St0 < 1.3 × St
•When Rg = 350 ohm: Based on St = 484.3 × 10-6 strain,
339.0 × 10-6 < St1 − St0 < 629.6 × 10-6 strain
•When Rg = 120 ohm: Based on St = 166.1 × 10-6 strain,
116.3 × 10-6 < St1 − St0 < 216.0 × 10-6 strain
●Analog output from a successful sensor check
•If St0 in the preceding MEMO has not been changed
after Balance adjustment, the value will return from
2.5 V to 0 V as shown in the figure at right.
•If St0 has been changed after Balance adjustment, the
value will not return from 2.5 V to 0 V as shown in
the figure at right.
NOTE
For five
seconds
Amount
of change
For five
seconds
0 V (after Balance adjustment)
+2.5 V (when the sensor
check is successful)
+2.5 V (when the sensor
check is successful)
0 V (after Balance adjustment)
 
･
≒






 Rs
Rg
RskRg RsRg
St 1
1
k
Rg
Rg1
Rg4
Rg3
Rg2
D(+IN)
B(-IN)
A(+BV)
C(-BV)
Rs
SW
St0
MEMO

18
If using the MRS-101A-V (1ch-Voltage Transmitter)
•The product does not have a sensor checking function for confirming the sensor connection.
Do not start measuring until you have confirmed that the input is connected.
•If the “CHECK” switch is pressed, the receiver operates differently depending on the firmware version as
shown below.
Firmware version
"CHECK" LED
"DATA" LED
Receiver Analog Output
Ver.1.00
Lit in green ●
↓
Off ●
Lit in green ●
(Lit for three seconds)
For approximately five
seconds
Approximately 2.5 V
output
Ver.2.00 or later
Off ●
Off ●
No change
l) "START" switch, "START" LED
The "START" switch is for starting measurement. The "START" LED below the "START" switch lights up in
green.
When the "START" switch is pressed, the product transitions from Command Mode to Measuring Mode and starts
outputting measurement data from the receiver’s analog output.
The "DATA" LED lights up in red for three seconds if a wireless communication error occurs even in a single
packet.
Measurement can only be started in Command Mode, and after the product switches to Measuring Mode, no
switches other than "STOP" and "MUTE" are available.
•When measurement starts normally:
1) When the "START" switch is pressed, the "DATA" LED, "LOCK" LED, and "START" LED light up in
green.
2) The product transitions from Command Mode to Measuring Mode.
3) One to three "Transmitter’s battery voltage checking" LEDs and one to three "RSSI" LEDs light up in green.
4) Outputting of measurement data begins from the receiver’s analog output.
•When measurement fails to start normally (due to a wireless communication error, etc.):
1) When the "START" switch is pressed, the "DATA" LED lights up in red for three seconds, and the buzzer
sounds.
(The buzzer does not sound if "MUTE" is off.)
2) Measuring Mode does not begin, and the product remains in standby in Command Mode.
"START" LED
"DATA" LED
Status
Lit in green ●
Lit in green ●
Switched to Measuring Mode. Measurement has started.
Begin outputting measurement data from the receiver’s analog output.
Off ●
Lit in red ●
(Lit for three
seconds)
Cannot transition to Measuring Mode. The product remains in standby
in Command Mode.
Try again in an environment that enables normal wireless
communication.
In
approximately
Seven seconds

19
●When measurement cannot be ended promptly
The first attempt to end measurement may not be successful if there are timing issues between the timing of
packet transmission and "STOP" command transmission from the receiver.
In this case, try pressing the "STOP" switch repeatedly to end measurement, with a short interval between
each attempt.
m) "STOP" switch
The "STOP" switch is for ending (stopping) measurement.
Press the "STOP" switch to transition from Measuring Mode to Command Mode.
•When measurement ends normally:
1) When the "STOP" switch is pressed, the "START" LED turns off.
2) Output of measurement data from the receiver’s analog output stops.
3) The "LOCK" LED, "DATA" LED, "Transmitter’s battery voltage checking" LEDs, and "RSSI" LEDs turn
off.
4) The product transitions from Measuring Mode to Command Mode.
•When measurement fails to end normally:
1) When the "STOP" switch is pressed, the "DATA" LED lights up in red, and the buzzer sounds.
(The buzzer does not sound if "MUTE" is off.)
2) The product remains in Measuring Mode, and output of measurement data continues.
"START" LED
"DATA" LED
Status
Off ●
Off ●
Switched to Command Mode. Measurement is finished
normally.
Lit in green ●
Lit in red ●
(Lit for three seconds)
Cannot transition to Command Mode, and the product continues
to measure in Measuring Mode.
Press the "STOP" switch again.
n) "Tx OFF" switch
Hold down the switch for at least three seconds to turn off the transmitter.
Once Tx OFF is executed, the transmitter remains off until it is manually restarted.
•When executed normally:
1) Hold down the "Tx OFF" switch for at least three seconds.
2) The "DATA" LED lights up in green.
One to three "Transmitter’s battery voltage checking" LEDs and one to three "RSSI" LEDs also light up in
green.
3) Tx OFF is executed, and the transmitter powers off.
•If measurement fails to start normally (due to a wireless communication error, etc.):
1) Hold down the "Tx OFF" switch for at least three seconds.
2) The "DATA" LED lights up in red, and the buzzer sounds.
(The buzzer does not sound if "MUTE" is off.)
3) Tx OFF is not executed, and the transmitter remains in standby in Command Mode.
"Battery voltage checking"
"RSSI" LED
"DATA" LED
Status
Lit in green ●
(Lit for three seconds)
Lit in green ●
(Lit for three seconds)
Tx OFF was executed normally.
Off ●
Lit in red ●
(Lit for three seconds)
Tx OFF was not executed normally.
Try again in an environment that enables normal wireless
communication.
MEMO