Yokogawa 2406E Operating Manual

User’s

Manual 2406E Series

Insulation Tester

Thank you for purchasing the YOKOGAWA 2406E Insulation Tester.

To optimize all the functions of the instrument, please read this manual thoroughly before operating it.

- Model -
2406 31	2406 33	2406 35
2406 41	2406 43	2406 45
2406 32	2406 34
2406 42	2406 44
6th Edition : Jun. 2006 (KP)			A3
All Rights Reserved, Copyright © 1996, Yokogawa M&C Corporation

IM 2406E-E

7th Edition July 2007

1.Regarding Safe Use of This Product

■For the safe use of this product, the following safety symbols are used on the product concerned:

	Danger! Handle with Care.
	This symbol indicates that the operator must refer to an explanation in the user’s manual in order to avoid
	risk of injury or death of personnel or damage to the instrument.
	High-voltage Terminal
	This symbol indicates a dangerous level of voltage (terminals fed from the interior by voltages exceeding
	1000 volts must be so marked). Never touch the terminal.
	AC Voltage
	This symbol indicates that an AC voltage is present.
	This indicates on the product that the operator must refer to an explanation in the user’s manual in order to
WARNING	avoid the risk of serious injury or death of personnel. The manual describes how the operator should exercise
	special care to avoid electric shock or other dangers that may result in serious injury or the loss of life.
	This indicates on the product that the operator must refer to an explanation in the user’s manual in order to
CAUTION	avoid the risk of injury or damage to the product. The manual describes how the operator should exercise
	special care to avoid dangers that may result in injury or damage to the instrument.

■Always observe the following instructions. Failure to observe these instructions may result in electric shock hazards or other dangers that may lead to serious injury or the loss of life.

WARNING

1. During Measurement of Insulation Resistance

•A high voltage is present at the probes. Do not touch the device under test (DUT) or the EARTH, LINE or GUARD terminal.

2. During Measurement of AC Voltages

•Do not press the MEAS key while measuring AC voltages.

•An AC voltage is present at the GUARD terminal. Do not touch the terminal.

3. Immediately After Measurement of Insulation Resistance

•The probes or DUT may remain highly charged. Do not touch them immediately after the completion of measurement.

4. Probes

•Use the probes supplied with this tester by Yokogawa Meters & Instruments.

•Do not use probes that have deteriorated or broken.

•Remove the probes from the DUT before attaching/detaching the probes to/from the tester.

5. Insulation of Casing

•Punctures in the protective insulation may occur if there are any cracks or other damage in the casing as a result of the instrument having been dropped or hit against other objects. Do not use the instrument before any remedial measures are taken; ask the manufacturer for repair.

6. DUTs

•Turn off electrical power to the DUT before you begin measuring insulation resistance.

•Avoid touching any electrified part while using the tester around electrically live locations. For safety, it is recommended that you use a pair of rubber gloves or other alternative means.

7. Battery Replacement

•Remove the probes from the DUT and then turn off the range selector switch before you open the casing to replace the batteries.

•Do not touch the MEAS key during replacement. Otherwise, a high voltage may be produced.

8. Operating Environment

•Do not operate the tester in an atmosphere where any flammable or explosive gas is present.

•Do not use the tester if there is condensation on it.

9. Disassembly

•No person, except service personnel from Yokogawa Meters & Instruments, is authorized to disassemble this instrument.

■Always observe the following instructions. Failure to observe these instructions may result in electric shock hazards or other dangers that may lead to injury or damage to the instrument.

CAUTION

1. Measurement of AC Voltages

• Do not apply any voltage between terminals that exceeds the specified limit.

2. GUARD Terminal

•The GUARD terminal is an auxiliary measurement terminal to eliminate a leakage current. Do not apply any testing voltage to the terminal.

3. Ranges

•Do not switch between the rated voltages until two to three seconds have elapsed after the completion of each measurement. Switching between voltages immediately after the completion of measurement may result in possible damage to the tester or DUT due to the electrical charge at the probes or DUT. Note that the tester is provided with a discharge feature.

4. Power to DUTs

•Electrical charges may be present at metals or wiring cables attached to electrical equipment being tested. Verify that the equipment is free from electrical charges before connecting the testing terminals. The same rule applies to the grounding wire.

5. Range Selector Switch

•Do not operate the range selector switch during testing.

•Do not apply any voltage to the testing terminals when measuring insulation resistance.

6. Batteries

•Do not mix batteries of different types or new batteries with used ones. If the tester will not be in service for a prolonged period, always remove the batteries before you store the instrument. If you store the tester with the batteries left installed, they are more likely to suffer fluid leakage, resulting in a malfunctioning of the instrument.

■Measurement Categories

Measurement category		Description	Remarks
1	CAT.1	For measurements performed on circuits not directly connected to MAINS.
2	CAT.2	For measurements performed on circuits directly connected to the low voltage installation.	Appliances, portable equipments, etc.
3	CAT.3	For measurements performed in the building installation.	Distribution board, circuit breaker, etc.
4	CAT.4	For measurements performed at the source of the low-voltage installation.	Overhead wire, cable systems, etc.

		Internal Wiring
		Distribution	CAT.3CAT.2
	Entrance	Board
	Cable		T
	CAT.4	CAT.1
		Fixed Equipment,	Outlet
		etc.	Equipment

Yokogawa Meters & Instruments Corporation
International Sales Dept.
Tachihi Bld. No.2, 6-1-3, Sakaecho, Tachikawa-shi,Tokyo 190-8586 Japan
Phone: [phone], Facsimile: 81-42-534-1426
YOKOGAWA CORPORATION OF AMERICA (U.S.A.)
Phone: [phone] Facsimile: 1-770-251-2088
YOKOGAWA EUROPE B. V. (THE NETHERLANDS)
Phone: [phone] Facsimile: 31-334-64-1610
YOKOGAWA ENGINEERING ASIA PTE. LTD. (SINGAPORE)
Phone: [phone] Facsimile: 65-6241-2606
YOKOGAWA AMERICA DO SUL S. A. (BRAZIL)
Phone: [phone] Facsimile: 55-11-5681-1274
YOKOGAWA MEASURING INSTRUMENTS KOREA CORPORATION (KOREA)
Phone: [phone] to -0664 Facsimile: 82-2-551-0665
YOKOGAWA AUSTRALIA PTY. LTD. (AUSTRALIA)
Phone: [phone] Facsimile: 61-2-9888-1844
YOKOGAWA INDIA LTD. (INDIA)
Phone: [phone] Facsimile: 91-80-2852-1441
YOKOGAWA SHANGHAI TRADING CO., LTD. (CHINA)
Phone: [phone] Facsimile: 86-21-6880-4987
YOKOGAWA MIDDLE EAST E. C. (BAHRAIN)
Phone: [phone] Facsimile: 973-336100
LTD. YOKOGAWA ELECTRIC (RUSSIAN FEDERATION)
Phone: [phone] Facsimile: 7-095-737-7869	IM3E-2006.2

2. Components and Their Functions

Line	Earth
terminal	terminal

Indicator window

Bottom cover setscrew

MEAS key

Bottom

cover

LIGHT key

Indicator window

Range selector switch

Used to switch between the ranges for measuring insulation resistance and to select the OFF position (battery check). MEAS key

Used for insulation resistance measurements and battery checks.

LIGHT key

Used to turn the lamp for the indicator window on or off.

Line terminal

Earth terminal

Guard terminal

Bottom cover

Bottom cover setscrew

Used to replace batteries.

3.Measuring the Insulation Resistance

•Connecting the Probes WARNING Item 4

Securely plug the line probe into the LINE terminal and the earth probe into the EARTH terminal.

•Disconnecting the Probes WARNING Item 4

1.Make sure the range selector switch is off.

2.Unplug the respective probes.

•Measuring the Insulation Resistance WARNING Items 1, 3 and 6; CAUTION Items 3, 4 and 5

1.Adjust the range selector switch to the voltage (rated voltage) to be applied to the DUT.

2.If the DUT is grounded, connect the earth probe clip to the DUT's ground line. If the DUT is not grounded, the earth probe clip may or may not be connected to the DUT's ground line.

3.Bring the line probe into contact with the DUT, and then press the MEAS key. The pointer then indicates the insulation resistance of the DUT. During measurement, exercise care to prevent the leadwire of the line probe from coming into contact with the ground, floor or other object. Not observing this precaution may result in a failure to measure the correct insulation resistance.

Upon completion of measurement, always turn the range selector switch off.

4.Immediately after measurement, electrical charges resulting from the applied testing voltage may be present at the probes or DUT. The tester, therefore, is designed to automatically begin discharging electricity upon completion of measurement.

•Discharge Feature

Any capacitive component in the DUT will be charged during measurement and thus the DUT remains electrified even after the completion of measurement, resulting in a hazardous condition.

The tester is designed to begin discharging when the MEAS key is turned off. The pointer then swings to the position on the scale proportional to the voltage that has developed across the terminals. After measurement is completed, leave the probes connected until the pointer swings back to the infinity sign (•) to allow the electricity in the DUT to fully discharge.

• Locking the MEAS Key WARNING Item 1

The MEAS key, when pulled up to the right, can be locked with the key left turned on. Use this mechanism when making continuous measurement over a prolonged period. Note, however, that leaving the key turned on for an unreasonably long time will accelerate the discharge of the batteries.

• Measuring Only the Volumetric Resistance WARNING Item 1; CAUTION Items 2 and 4

For example, assume that you are doing an insulation test on a cable, as
shown in the figure on the right.
If you bring a lead (optional) connected to the GUARD terminal into con-
tact with an insulator overlapped by bare conducting wire, you can measure							Core wire
the volumetric resistance only. This is because the leakage current that				Indicating	LINE		Bare conducting wire
flows along the surfaces of the insulator does not flow into the indicator. A				meter			Insulator
				Power	GUARD
dedicated lead (part number: 321803) is necessary when using the GUARD				supply			Metal cladding
					EARTH
terminal.	Main unit

IM 2406E-E <1>