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Yokogawa 275200
Manual
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Yokogawa Yokogawa 275200 Manual

User's
2752
Manual
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
Precision Double Bridge
IM 2752-01E
IM 2752-01E
6th Edition: Oct. 2017 (YMI)

Introduction

Thank you for purchasing our Precision double bridge.
This manual describes the specifications and handling precautions of the Precision double bridge.
Before using this product, thoroughly read this manual to understand how to use it properly.
Contact information of Yokogawa offices worldwide is provided on the following sheet.
PIM 113-01Z2: Inquiries List of worldwide contacts
Notice regarding This User’s Manual
• The information covered in this User’s manual is subject to change without prior notice.
• Every effort has been made to ensure accuracy in the preparation of this manual.
Should any errors or omissions come to your attention however, please inform YOKOGAWA accordingly.
• YOKOGAWA is by no means liable for any damage resulting from the user’s mishandling of the product.
• This manual is intended to describe the functions of this product.
YOKOGAWA does not guarantee that these functions are suited to the particular purpose of the user.
― i ―
IM 2752-01E

Cautionary Notes for Safe Use of the Product

WARNING
When operating the instrument, be sure to observe the cautionary notes given below to ensure correct and
safe use of the instrument.
If you use the instrument in any way other than as instructed in this manual, the instrument’s protective
measures may be impaired.
This manual is an essential part of the product; keep it a safe place for future reference.
YOKOGAWA is by no means liable for any damage resulting from use of the instrument in contradiction to
these cautionary notes.
■ The following safety symbols are used on the instrument and in the manual:
Danger! Handle with Care.
This mark indicates that operator must refer to an explanation in
the instruction manual in order to avoid risk of injury or death of
personnel or damage to the instrument.
This mark indicates earth (ground).
■ Since mishandling the instrument can result in an accident that may lead to
injury or death of the operator, such as an electric shock, be sure to observe
the following instructions.
● Protective Measures
• If a crack appears in the instrument after it has been accidentally dropped or bumped,
the safety-purpose insulation may be damaged.
By all means do not use the instrument, but ask the manufacture for repair.
● Connection
• To avoid electric shock, be sure to apply protective grounding to the grounding terminal.
• Install a protection fuse as shown in the example of measurement.
● Measurement
• Always maintain the instrument within the limits for allowable current, voltage and power,
during operation.
If there is more than one limit for any of these parameters, the lowest limit takes precedence.
● External Power Supply
• Only operate the instrument on a supply voltage no greater than 60 VDC.
● Operating Environment
• Do not operate the instrument in a flammable or explosive gas atmosphere.
• Do not operate the instrument if there is any condensation on it.
● Do Not Remove the Case or Disassemble
• Do not open the case except when replacing batteries.
Only Yokogawa service personnel are authorized to remove the casing or disassemble or
modify the instrument.
Do not attempt to repair the instrument yourself, as doing so is extremely dangerous.
― ii ―

CONTENTS

Introduction ............................................................. i
Cautionary Notes for Safe Use of the Product ..................................ii
1. GENERAL ...........................................................1
2. SPECIFICATIONS.....................................................2
3. COMPONENT NAMES AND FUNCTIONS..................................4
4. ACCESSORY COMPONENTS ...........................................6
4.1 Galvanometer (Null-detector).........................................6
4.2 Battery and Current Adjusting Resistor .................................7
5. HANDLING ..........................................................8
5.1 Preparation ......................................................8
5.1.1 Connection for Battery ...............................................8
5.1.2 Connection for Galvanometer .........................................9
5.1.3 Connection for Unknown Resistance....................................9
5.1.4 Connection for External Standerd Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1.5 Grounding .......................................................12
5.2 Operation .......................................................12
6. MAINTENANCE .....................................................14
6.1 Precaution for handling ............................................14
6.2 Inspection.......................................................15
6.2.1 Preliminary inspection ..............................................15
6.2.2 Inspection of standard resistors (R11 to R16) ............................15
6.2.3 Overall inspection .................................................16
― iii ―
IM 2752-01E
7. CIRCUIT PRINCIPLE .................................................17
7.1 Basic Principle ...................................................17
7.2 Error ...........................................................18
7.2.1 Error due to current lead resistance....................................18
7.2.2 Error due to potential lead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.2.3 Error of standard resistor ............................................19
8. CIRCUIT DIAGRAM ..................................................21
― iv ―

1. GENERAL

This equipment is a precision DC low resistance measuring instrument
which is designed for precise measurement of values under 100 Ω.
This instrument uses resistance wire made of choice material aged for a long period of time.
In addition, special consideration is taken in locating guards which are firmly enclosed in
the metallic casing, so that they can be stably used for a long period of time.
Detailed five-figure readings are available with six built-in standard resistors,
three decade dials, and slide resistance.
The in-line decade indication system is employed to express resistance values,
insuring rapid reading.
This instrument can be used also for measurement of electric conductivity of a conductor and
calibration of a resistance standard, as well as for precision measurement of general resistances.
In addition, is designed for use in combination with accessories for large-capacity shunt checks and
measurement of bar conductor resistance.
― 1 ―
IM 2752-01E

2. SPECIFICATIONS

0.10000 mΩ abs to 111.10 Ω abs
Ω.
Measuring range:
Measuring Arm (at multiplier
Multiplier:
Accuracy:
Current Rating of standard resistance:
Dimensions:
Insulation resistance: between the case and the circuit
Weight:
Accessories: Two Plugs, User's manual
(Effective up to five digits)
(Ω abs: Absolute ohms)
× 1):
1st dial
2nd dial
3rd dial
4th dial
× 100, × 10, × 1, × 0.1, × 0.01, and × 0.001
±(0.03% of reading + 1 μΩ)
with ambient temperature of 23 ± 2.5°C
±(0.05% of reading + 1 μΩ)
with ambient temperature of 10 to 40°C
The lead resistance between C
× 100: 0.05 A
× 10: 0.15 A
× 1: 0.5 A
100 mΩ × 10
10 mΩ × 10
1 mΩ × 10
0.05 mΩ to 1.05 mΩ
(continuously variable)
(Minimum scale division: 0.01 mΩ)
terminal and Rx is less than 10 m
2
× 0.1: 3 A
× 0.01: 10 A
× 0.001: 30 A
Approx. 316 × 497 × 140 mm (not including rubber feet)
Note: Standard rack mounting is available.
100 MΩ or more at 500 VDC
Approximately 11.5 kg
― 2 ―
Accessories (Available upon request)
resistance value: approx. 2.5 mΩ
(1) Measuring cords (2753)
(2) Clamp device (2754)
Current cord (two):
2 m long,
resistance value: approx. 3 mΩ
Voltage cord (two):
2 m long,
resistance value: approx. 8 mΩ
(A clamp fitting is attached to the end of each cord.)
Effective measuring length of sample:
500 mm
(Distance between voltage terminals)
Maximum diameter of sample:
Minimum length of sample:
Current cord (two):
500 mm long,
25 mm
650 mm
resistance value: approx. 1 mΩ
Voltage cord (two):
500 mm long,
― 3 ―
IM 2752-01E

3. COMPONENT NAMES AND FUNCTIONS

[5]
[2]
[8]
[9] [6]
[7] [10]
[3]
Fig. 3.1 Front Panel
P1
C1
Rx
MULTIPLY
1 0.1
10
0.15 0.5 3
2
6
7
8
9
10
G2 G1 G0 Gs
[4]
P2
0.01
10 30
C2
0.001
P1S
P2S P2S
YOKOGAWA
DOUBLE BRIDGE
4
3
2
1
0
[1]
2752
9
10
BA
GA GUARD
GA
BA
58
1
0
10
11
1
2
3
4
m Ω
9
8
7
6
5
Fig. 3.1 shows dial and terminal arrangement of this instrument.
[1] DIALS: I, II, III, IV
for use in adjustment of measuring arms
[2] MULTIPLYING FACTOR SWITCH PLUG:
to changeover the multiplying factors, by replacing two plugs at the same time.
[3] BA KNIFE SWITCH:
to be used as ON ‒ OFF, or to reverse the circuit current
[4] GALVANOMETER BUTTON SWITCH:
to select sensitivity; on G2 or G1 or C0 gives the highest sensitivity, and G1 is more sensitive than G2.
The use of Gs is to short circuit the galvanometer.
These G switches are clamped by turning them clockwise or counter-clockwise, after pushing them down.
― 4 ―
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