YOKOGAWA 701957 User manual

User’s
Manual Model 701957 Bridge Head
(DSUB-120 Ω, Shunt CAL,
Enhanced Shield)
Model 701958 Bridge Head
(DSUB-350 Ω, Shunt CAL,
Enhanced Shield)
IM 701957-01E
2nd Edition

1
IM 701957-01E
Foreword
Thank you for purchasing the bridge head (701957/701958).
This User’s Manual contains useful information about the function, procedures in
connecting the gauge, and handling precautions of the bridge head. To ensure correct
use, please read this manual thoroughly before operation.
Keep the manual in a safe place for quick reference in the event a question arises.
Notes
•The contents of this manual are subject to change without prior notice as a result of
continuing improvements to the device’s performance and functions.
•Every effort has been made in the preparation of this manual to ensure the accuracy
of its contents. However, should you have any questions or find any errors, please
contact your nearest YOKOGAWA dealer as listed on the back cover of this manual.
•Copying or reproducing all or any part of the contents of this manual without
YOKOGAWA’s permission is strictly prohibited.
Revisions
•1st Edition: February, 2003
•2nd Edition: October, 2017
Disk No. DL40
2nd Edition: October 2017 (YMI)
All Rights Reserved, Copyright © 2003 Yokogawa Electric Corporation
All Rights Reserved, Copyright © 2017 Yokogawa Test & Measurement Corporation

2IM 701957-01E
Checking the Contents of the Package
Unpack the box and check the contents before using the device. If the contents are not
correct or missing or if there is physical damage, contact the dealer from which you
purchased them.
Bridge Head
Check that the model name given on the name plate match that on the order. When
contacting the dealer from which you purchased the device , please quote the device
No.
Made in Japan
Model
Model Specifications Description
701957 Bridge resistance 120 ΩShunt CAL, enchanced shield
701958 Bridge resistance 350 ΩShunt CAL, enchanced shield
No. (Device number)
When contacting the dealer from which you purchased the device, please quote this
number.
Standard Accessories
D-Sub cable
(for 701957, 701958)
B8023WP
Length: 5 m
Attaching Plate
B9947KR
2 Binding screws
(M4 × 5 mm)
This User’ Manual

3
IM 701957-01E
Conventions Used in this Manual and on the Device
Symbols Used on the Device
GND terminal
The operator must refer to an explanation in the User’s Manual.
Symbols Used in this Manual
Note
Provides important information for the proper operation of the device.

4IM 701957-01E
Contents
Foreword ........................................................................................................................................ 1
Checking the Contents of the Package .......................................................................................... 2
Conventions Used in this Manual and on the Device ..................................................................... 3
1Construction of the Device .................................................................................................. 5
2Shunt Calibration ................................................................................................................ 7
3Connecting the Strain Gauge .............................................................................................. 8
4Fixing the Device in Place ................................................................................................. 10
5Connecting to the Strain Instrument ................................................................................. 11
6Calibrating Using a Shunt Resistor ................................................................................... 12
7 Specifications .................................................................................................................... 16

5
IM 701957-01E
1Construction of the Device
The bridge head is a converter for inputting the amount of change of the resistance of
the strain gauge to the amplifier. Six types of connection methods (single-gauge, single-
gauge three-wire, adjacent-side two-gauge, opposed-side two-gauge, opposed-side two-
gauge three-wire, and four-gauge) are supported by setting the switch.
Names of the Parts
Cable
B8023WP
Connector
Switch
Strain gauge
connection terminal
GND terminal
Connect to a measuring instrument.
Shunt resistant
connection terminal
Terminals and Circuit Diagram
1
2
3
4
5
6
7
8
9
1
2
345
76
8
9
1
2
3
4
5
7
6
8
9
7
9
8 3 2 5 6
4
1
1
Bridge+
Bridge+
Bridge-
Bridge-
Input+
Input+
Input-
Input- Sense+
Sense+
Sense-
Sense- Suntcal+
Suntcal+
Suntcal-
Floating Common
Suntcal-
Shell
R
R
R
2
3
BRIDGE HEAD(120 )
GAUGE SELECT
SHUNT RESISTANCE
SW
ON
OFF
12345
123456
789 78978 9
STRAIN GAUGE
SHUNT CALSHUNT CAL
4GAUGE2GAUGE
1GAUGE
1GAUGE 2GAUGE 4GAUGE
(SHUNT CAL, ENHANCED SHIELD)
Strain gauge
connection
terminal
Switch
D-Sub connector
GND terminal
GND terminal
(Terminal
number)
(Switch number)
Pin Signal name
symbol Floating common
Sense– (Sensing of the bridge voltage-)
Shuntcal–(Shunt signal–)
Shuntcal+(Shunt signal +)
Sense+ (Sensing of the bridge voltage+)
Bridge– (Bridge voltage –)
Input– (Measurement signal –)
Input+ (Measurement signal +)
Bridge+ (Bridge voltage +)
Pin assignments of the connector (Bridge head side)
Shunt resistant
connection
terminal
The numbers inside are the terminal
numbers.
The numbers inside are the switch
numbers.
The numbers inside are the pin
numbers of the connector.

6IM 701957-01E
Wiring for Accessory Cable B8023WP
A wiring diagram for the accessory cable is given below. The connector shell connects
to the shielding.
9
6
8
7
5
2
4
3
1
Shell
Twist
Twist
Twist
Shield
Twist
9
6
8
7
5
2
4
3
1
Shell
Bridge+
Bridge-
Input+
Input-
Sense+
Sense-
Shuntcal+
Shuntcal-
Floating Common
1
5
6
9
1
5
6
9
Bridge+
B8023WP
Bridge-
Input+
Input-
Sense+
Sense-
Shuntcal+
Shuntcal-
Floating Common
Note
Check the shape and pin assignment of the connector before connecting it to the accessory
cable.
Circuit Diagram for Bridge Head and Measuring Instrument
The circuit diagram below shows the bridge head connected to a measuring instrument
(the DL750). Isolate the strain gauge before use.
CAUTION
Do not connect the strain gauge terminal to any items with electric potential.
B8023WP
Bridge+
Bridge+
Bridge-
Bridge-
Input+
Input+
Input-
Input-
Sense+
Sense+
Sense-
Sense-
Shuntcal+
Shunt resistor
Shuntcal-
Shuntcal+
Shuntcal-
R
R
R
9
6
8
7
5
2
4
3
1
Shell
Twist
Twist
Twist
Shield
Twist
9
6
8
7
5
2
4
3
1
Shell
Bridge+
Bridge-
Input+
Input-
Sense+
Sense-
Suntcal+
Suntcal-
Floating Common
Floating
Common
Floating
Common
ON/OFF
Shuntcal-
Sense+
+
-
Sense-
Sense+
Sense-
701271
STRAIN_DSUB
AD
Bridge
Power
+
-
Shuntcal
Shuntcal+
*2
The connector shell
is connected to the
case potential of the
bridge head.
Bridge Head 701957/701958
(with shunt calibration support)
GND
terminal
Measurement instrument
(example: DL750)
All module
signals are
isolated.
Module
Case
Case
The connector shell is connected
to the case potential of the
measurement instrument.
*2
*1 The GND (floating common) of the module is connected to the case potential inside the bridge head.
*2 The bridge head case, the cable shield, and the measurement instrument case are connected as measures against noise.
*2
The shield is connected
to the bridge head case
and the measurement
instrument case.
*1
The floating common of the
module is grounded within
the bridge head.
1 Construction of the Device

7
IM 701957-01E
2Shunt Calibration
This instrument supports shunt calibration. When executing shunt calibration, perform
balancing without applying a load to the strain gauge, then turn on shunt resistance. The
values from the shunt resistance are stored on the measuring instrument.
P2:X
P2:Y
Balance Shunt calibration
Strain Strain
Before execution
Before execution
After execution
After execution
Strain input Strain input
The zero point is corrected
when balancing is executed.
Current measured
value*
Gain is corrected.
The strain value corresponding to
the shunt resistor is set to P2:Y of
the setup menu.
* Automatically obtained when shunt calibration is executed.
Shunt calibration is used to correct the gain of strain measurements by inserting a known
resistance (shunt calibration resistance (shunt resistance)) in parallel with the strain
gauge. With this instrument, the gain can be corrected on both the positive and negative
sides. Make sure to notice whether the corresponding strain values are positive or
negative.
When correcting the gain on the negative side (normal)
Shunt resistor insertion terminal: between 8 to 9
Set negative to the corresponding strain value.
789Bridge+
Bridge-
In+
120 Ω
120 Ω
120 Ω
In-
Shunt calibration relay
circuit (Built into the
strain module. Turns
ON/OFF automatically
when shunt calibration
is executed.)
Shunt resistor
(Applied to the bridge head)
Bridge
voltage
Shunt resistor
Strain
gauge
Shunt resistant
connection terminal
When correcting the gain on the positive side
Shunt resistor insertion terminal: between 7 to 8
Set positive to the corresponding strain value.
Bridge+
Bridge-
In+
In-
789
120 Ω
120 Ω
120 Ω
Shunt calibration relay
circuit (Built into the
strain module. Turns
ON/OFF automatically
when shunt calibration
is executed.)
Shunt resistor
(Applied to the bridge head)
Bridge
voltage
Shunt resistor
Strain
gauge
Shunt resistant
connection terminal
For specific instructions on performing shunt calibration, refer to your measuring
instrument’s user’s manual. For information on shunt resistance and the corresponding
strain values, see page 13 in “Calculation of the Shunt Resistance.”

8IM 701957-01E
3Connecting the Strain Gauge
The bridge head can support six types of connection methods: single-gauge, single-
gauge three-wire, adjacent-side two-gauge, opposed-side two-gauge, opposed-side two-
gauge three-wire, and four-gauge.
Do not connect the strain gauge terminal to any items with electric potential.
CAUTION
Do not connect the strain gauge terminal to any items with electric potential.
Use the lead wires included with the strain gauge or wires meeting the following
specifications to connect the strain gauge and the bridge head.
•Usable wire: single wire φ 0.14 to 1.5 mm2, or stranded wire 0.14 to 1.5 mm2 (AWG26
to 16)
• Normal length of bare wire : 6 mm
Note
•Isolate the strain gauge before use.
•Make the wires between the strain gauge and bridge head as short as possible.
•Proper measurements may not be possible in an environment where electromagnetic
interference exists.
•If you are shielding the strain gauge, connect the shield wire to the floating common
terminal of the bridge head.
• For the handling of the strain gauge, see the instruction manual that came with the shield
gauge.
Single-gauge Method
ON
OFF
1
2
3
4
5
6
12345
Bridge+ (Sense+)
Input- (Shuntcal-)
Bridge- (Sense-)
Input+
1
23
4
56
9
8
7
Bridge+
Sense+
Bridge-
Sense-
Input+
Input-
Shuntcal-
Shuntcal
ON/OFF
Shuntcal+
Bridge head terminal
Strain gauge
Strain gauge
Shunt
resistor
Switch setting of
the bridge head
Single-gauge Three-wire Method
ON
OFF
1
2
3
4
5
6
12345
1
23
4
56
Bridge+ (Sense+)
Input- (Shuntcal-)
Bridge- (Sense-)
Input+
9
8
7
Bridge+
Sense+
Bridge-
Sense-
Input+
Input-
Shuntcal-
Shuntcal+
Shuntcal
ON/OFF
Bridge head terminal
Strain gauge
Strain gauge
Shunt
resistor
Switch setting of
the bridge head

9
IM 701957-01E
Adjacent-Side Two-gauge Method
ON
OFF
1
2
3
4
5
6
12345
1
3
4
56
Bridge+ (Sense+)
Input- (Shuntcal-)
Bridge- (Sense-)
Input+
Bridge+
Sense+
Bridge-
Sense-
Input-
Input+
Bridge head terminal
Strain gauge
Strain gauge
Strain gauge
Switch setting of
the bridge head
Opposed-Side Two-gauge Method
ON
OFF
1
2
3
4
5
6
12345
1
23
4
56
Bridge+ (Sense+)
Input- (Shuntcal-)
Bridge- (Sense-)
Input+
Bridge+
Sense+
Bridge-
Sense-
Input-
Input+
Bridge head terminal
Strain gauge
Strain gauge
Strain gauge
Switch setting of
the bridge head
Opposed-Side Two-gauge Three-wire Method
ON
OFF
1
2
3
4
5
6
12345
1
23
4
56
Bridge+ (Sense+)
Input- (Shuntcal-)
Bridge- (Sense-)
Input+
Bridge+
Sense+
Bridge-
Sense-
Input-
Input+
Bridge head terminal
Strain gauge
Strain gauge
Strain gauge
Switch setting of
the bridge head
Four-gauge Method
ON
OFF
1
2
3
4
5
6
12345
1
3
4
6
Bridge+ (Sense+)
Input- (Shuntcal-)
Bridge- (Sense-)
Input+
Bridge+
Sense+
Bridge-
Sense-
Input-
Input+
Bridge head terminal
Strain gauge Strain gauge
Strain gauge
Strain gauge
Strain gauge
Switch setting of
the bridge head
3 Connecting the Strain Gauge