User's
2786
Manual
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
Decade Resistance Box
IM 2786-01E
8th Edition: Oct. 2017 (YMI)
IM 2786-01E
Introduction
Thank you for purchasing the 2786 Decade Resistance Box.
This User’s manual contains useful information regarding
the instrument’s functions and operating procedures,
as well as precautions that should be observed during use.
Before using this product, thoroughly read this manual
to understand how to use it properly.
Keep this manual in a safe place for quick reference in
the event that a question arises.
Contact information of Yokogawa offices worldwide is
provided on the following sheet.
PIM 113-01Z2 Inquiries List of worldwide contacts
Notes
• The information contained in this manual is subject to
change without notice. Furthermore, the actual display
items may differ slightly from the ones appearing in
this manual.
• Every effort has been made to ensure the information
contained herein is accurate.
However, should any concerns, errors, or emissions
come to your attention, or if you have any comments,
please contact us.
• Copying or reproduction of any or all of the content of
this manual without Yokogawa’s permission is strictly
prohibited.
8th Edition: October 2017
All Rights Reserved. Copyright ©
2017, Yokogawa Test & Measurement Corporation
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IM 2786-01E
WARNING
CAUTION
Cautionary Notes for Safe Use of the Product
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 symbol indicates that the operator must refer
to an explanation in the User’s Manual or
Service Manual in order to avoid risk of injury or
loss of life of personnel or damage to
the instrument.
Indicates a hazard that may result in the loss of life or
serious injury of the user unless the described instruction
is abided by.
Indicates a hazard that may result in an injury to the user
and/or physical damage to the product or other equipment
unless the described instruction is abided by.
― ii ―
IM 2786-01E
■ Since mishandling the instrument can result in
WARNING
WARNING
an accident that may lead to injury or death of
the operator, such as an electric shock,
be sure to observe the following instructions.
● 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.
• Only operate the instrument on an input-to-ground supply
voltage of no greater than 250 V.
• The terminals and internal circuitry may become electrified
to high voltages and extremely hot depending on
the instrument’s condition of use.
Do not touch these parts.
● Grounding
• To avoid electric shock, be sure to apply protective
grounding to the grounding terminal.
● Protective Measure
• 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 manufacturer for repair.
● 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 Casing or Disassemble
• 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.
(If you are rack-mounting the instrument,
use it correctly according to the handling procedure.)
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IM 2786-01E
CONTENTS
Introduction ..................................i
Cautionary Notes for Safe Use of the Product .......ii
1. GENERAL ................................1
1.1 Description............................1
1.2 Features .............................1
1.3 Specification .........................2
2. NAMES AND FUNCTIONS OF COMPONENTS ..3
3. OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. MAINTENANCE ...........................6
5. CIRCUIT DIAGRAM ........................7
Disposing the Product.........................10
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