Yokogawa 3213A Operating Manual

User’s
Manual

3213A Series
Insulation Tester

Please read through this instruction manual before starting operation in order to ensure
correct and effective use of Model 3213A Insulation Tester.

1st Edition : June 1994 (YG)
All Rights Reserved, Copyright © 1994, Yokogawa M&C Corporation

Safety Precautions

■ For safe use of this tester, the following safety symbols are used in the user's manual:

B3

IM 321341-01E

5th Edition:Sep. 2008

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: 1-770-254-0928

YOKOGAWA EUROPE B. V. (THE NETHERLANDS)

Phone: [phone] Facsimile: 31-33-464-1610

YOKOGAWA AMERICA DO SUL LTDA. (BRAZIL)

Phone: [phone] Facsimile: 55-11-5681-4434

YOKOGAWA ENGINEERING ASIA PTE. LTD. (SINGAPORE)

Phone: [phone] Facsimile: 65-6241-2606

YOKOGAWA MEASURING INSTRUMENTS KOREA CORPORATION (KOREA)

Phone: [phone] to -0664 Facsimile: 82-2-551-0665

YOKOGAWA AUSTRALIA PTY. LTD. (AUSTRALIA)

Phone: [phone] Facsimile: 61-2-8870-1111

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 B. S. C (C) (BAHRAIN)

Phone: [phone] Facsimile: 973-17-336100

YOKOGAWA ELECTRIC CIS LTD. (RUSSIAN FEDERATION)

Phone: [phone] Facsimile: 7-495-737-7869

IM3E-2008.8

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 tester.

High-voltage Terminal
This symbol indicates a dangerous voltage level (terminals with voltages exceeding 1000 volts must be so marked).
Never touch the terminals.

WARNING Indicates a hazard that may result in the loss of life or serious injury of the user unless the described instruction is

abided by.

CAUTION 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.

WARNING

■ To avoid injury, death of personnel, carefully observe and follow the warnings listed below:

1. During the measurement of insulation resistance

•A high voltage is generated in the probe during the measurement of insulation resistance.
Do not touch the measured object, the EARTH or LINE terminals or the GUARD terminal.

2. During the measurement of AC voltage

• There is AC voltage at the GUARD terminal during the measurement of AC voltage. Do not touch the GUARD
terminal.

• Do not press the switch when measuring the AC voltage.

3. Immediately after the measurement of insulation resistance

• The probes or measured object may remain highly charged. Do not touch them immediately after measurement.

4. Probe

• Use the dedicated probe supplied by Yokogawa for the instrument.

• Do not use a deteriorated or damaged probe.

• Do not attach/detach the probe to/from the instrument prior to releasing it from the measured object.

5. Protection

• If there are any cracks or other damage in the case because of being dropped or struck, the instrument may not be
safely insulated. Do not use the instrument before any remedial measures are taken.

6. Object to be measured

• When insulation resistance is measured, turn off the power to the measured object.

• When the instrument is used in a location where an electric current is flowing, never touch the power line.
Use rubber gloves as a safety precaution.

7. Replacement of batteries

• Prior to detaching the cover for replacing the batteries, release the probe from the measured object and turn off the
switch.

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

8. Operating Environment

• Do not operate the instrument in a flammable or explosive gas atmosphere.

• Do not operate the instrument if there is condensation on it.

9. Disassembly

• Do not attempt to disassemble the instrument.

CAUTION

■ To avoid injury of personnel or damage to the instrument, carefully observe and follow the cautions

listed below.

2. Measuring Operations

● Connecting the Measuring Lead Unit

Connect the measuring lead unit (1) to the tester by inserting its plugs into the line terminal (10) and earth terminal (11).
Be sure to insert the plug of the line probe to the line terminal, and the plug of the earth lead clip to the earth terminal.
These plugs are locked once they are securely inserted.

Measurement wiring

Set the switch to OFF.

Earth probe

Line probe

● Disconnecting the Measuring Lead Unit

Disconnect the measuring lead unit while pressing the earth terminal and line terminal release buttons (2) and (3)
simultaneously.

● Measurement of Insulation Resistance

If the object to be measured is earthed, connect the earth lead clip to the earthing point of the object. Apply the line probe of
the measuring lead unit (1) to the object to be measured, then press the switch (4). The tester needle indicates the obtained
insulation resistance value. When applying the line probe, do not allow its lead wire to come into contact with the earth, floor,
or other object. If this happens, insulation resistance cannot be measured correctly. The earth lead clip
may be either connected if the object to be measured is not earthed.

● Locking the Switch

Pull up the switch (4) to keep it in the ‘on’ position. This function is useful if measurement is to continue
for a long time. If the locked state is prolonged, however, the battery will quickly become depleted.

● Using the Optional Probe with a Switch

Insert the probe plugs to the line terminal (10), earth terminal (11), and jack (9). To start measurement,
press the probe switch instead of the switch (4) on the main unit.

● Measurement of Volume Resistance

Volume resistance alone can be measured without any effect of surface leakage resistance. When testing a cable, for example,
wrap a bare wire around the insulating material, and connect an optional lead
for guard terminal between the bare wire and the guard terminal (12) as shown
in the figure on the right. This prevents leakage current on the insulating
material from flowing into the tester; thus only volume resistance can be
measured correctly. When measuring volume resistance, the optional lead for
guard terminal (model: 321803) must be used for connection to the guard
terminal.

WARNING

Beware of electric shock. There is voltage between the earth and line terminals and between the earth and guard terminals.

Power supply side

(primary)

ON

OFF

Load side

(secondary)

Grounding

electrode

Indicator

Power
Source

Instrument Proper

LINE

GUARD
EARTH

Core Wire
Bare Wire

Insulating
Material

Metal-Sheath

1. Measurement of AC voltage

• Do not apply a voltage over the allowable limits between the terminals.

2. GUARD terminal

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

3. Power supply to the measured object

• Metals and wiring connected to the electric equipment may have a voltage being applied. Confirm that no voltage is
being applied prior to connecting the measurement terminal. The same precaution applies to the grounding system.

4. Batteries

• Do not use different types of batteries together or new and old batteries together. If the instrument is not used for a long
period, store the instrument with the batteries removed. Otherwise, any leakage from the batteries may damage the
instrument.

■ Adjusting the position of the tester needle (infinity scale)

Before the measurement, make sure that the tester needle is positioned on the infinity (∞) mark
while the measurement probe is removed.
If the needle is not positioned correctly, adjust the position as follows.

1. Loosen the screw (15) using a coin or similar, and then remove the bottom cover (14).

2. Turn the zero adjustment screw shown in the rear view with a screwdriver, etc. to adjust the

<Front view>

position of the needle. During the adjustment, support the instrument horizontally with the
front side up.

3. After the adjustment, put the bottom cover (14) back and fasten the screw (15).

In the following cases, the instrument does not measure correctly and needs to be repaired.

• The position of the needle cannot be adjusted by turning the zero adjustment screw.

• The needle is bent and unable to show the correct value on the scale.

1. Component Names

(5) Battery Check Mark
(BAT Mark)

(4) Switch (with lock)

(8) Strap

(2) Earth Terminal Release Button

(1) Measuring Lead Unit

(3) Line Terminal Release Button

(6) Battery Check Terminal

(7) Case

(9) Jack for the Optional Probe with a Switch

(10) Line Terminal

(13) Handling Guide

(15) Screw to Fasten Bottom Cover

(11) Earth Terminal

(12) Guard Terminal

(14) Bottom Cover

<Rear view>

Earth Lead Clip

Measuring Lead Unit

Zero adjustment screw

Line Probe

3. Zero Checking

Connect the line terminal (10) and earth terminal (11) together using the measuring lead unit (1), and press the switch (4). If the
tester needle indicates a reading not exceeding the zero scale indication, the tester is considered normal. If it does not, check the
batteries following the instructions given in Item 4, “Checking the Batteries.” If the batteries have run down, replace them as
described in Item 5, “Replacing Batteries,” and then perform zero checking again. If the tester needle does not indicate the proper
point even though the batteries are still available, the tester requires adjustment. Please contact your nearest Yokogawa.

4. Checking the Batteries

1. Without pressing the switch, apply the line probe to both poles of the battery
check terminal (6) simultaneously as shown in the figure on the right.

2. If the tester needle indicates any reading below the battery check mark (BAT)
(5) on the scale plate, the batteries can still be used.

3. Readings above the battery check mark mean that the batteries have run
down. Replace them according to the instructions given in Item 5, “Replacing
Batteries.”

5. Replacing Batteries

l. Loosen the screw (15) on the bottom cover using a coin or similar, and then

remove the bottom cover (14).

2. Replace all 8 batteries at the same time. Batteries must be placed oriented according to the polarity indication written on the
holder.

WARNING

• Prior to detaching the cover for replacing the batteries, release the probe from the measured object and turn off the switch.

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

CAUTION

A malfunction may occur if a dead battery leaks.

6. AC Voltage Measurement

This tester can also measure AC voltages of commercially-available frequencies. Therefore, use this function during the
insulation resistance test to confirm that there is no voltage applied to the object to be measured.

1. Insert the measuring lead unit (1) to the tester by inserting its plugs into the line terminal (10) and earth terminal (11) in the
same manner as when measuring insulation resistance.

2. Apply the measuring lead unit to the AC voltage test point, and read the indication on the voltage measuring scale (AC V).
Do not press the switch (4) when measuring AC voltages.

WARNING

Do not connect a guard-terminal lead to the guard terminal (12). AC voltage is applied to the guard terminal during AC
voltage measurement. This may cause electric shock.

7. Maintenance

■ Storage Conditions

• Temperature: -10 to 60⬚C

• Humidity: 70% RH or less (with batteries removed, no condensation)

• Avoid storing the instrument in the following location:
moisture; direct sunlight; a high-temperature heat source nearby;
exposure to severe mechanical vibrations; a large amount of dust and/or salt or a corrosive gas.

■ Cleaning

Clean the instrument with a damp cloth using water or alcohol. Use of a solvent (chemicals) such as a thinner or benzine may
cause discoloration.

■ Calibration

Interval between calibrations: One year
Periodic calibration is required to ensure the accuracy of measurement. Please contact your nearest Yokogawa for calibration.

8. Specifications

Specifications for this instrument conform to JIS C 1302-2002 (Japanese Industrial Standard).

Model Rating First Effective Second Effective Central Scale AC Voltage Low-limit Rated

321341 100 V/20 M⍀ 0.02 to 10 M⍀ 10 to 20 M⍀ 0.5 M⍀ 0 to 150 V 0.1 M⍀ 1 mA
321342 250 V/50 M⍀ 0.05 to 20 M⍀ 20 to 50 M⍀ 1 M⍀ 0 to 250 V 0.25 M⍀ 1 mA
321343 500 V/100 M⍀ 0.1 to 50 M⍀ 50 to 100 M⍀ 2 M⍀ 0 to 300 V 0.5 M⍀ 1 mA
321344 500 V/ 1000 M⍀ 1 to 500 M⍀ 500 to 1000 M⍀ 20 M⍀ 0 to 300 V 0.5 M⍀ 1 mA**
321345 1000 V/2000 M⍀ 2 to 1000 M⍀ 1000 to 2000 M⍀ 50 M⍀ 0 to 300 V 1 M⍀ 1 mA**

*:The minimum reading that can maintain the rated voltage.
**: 0.55 mA in the first effective measuring range.

Standard Conditions

Ambient temperature : 23⫾5⬚C
Relative humidity : 45 to 75%RH
Position : Horizontal (within 5⬚ of the horizontal)
External magnetic field : None
Battery voltage : Within the effective battery range (below the battery check mark on the scale plate).

Tolerances (under standard conditions): Intrinsic error

Measured resistance : ⫾5% in the first effective measuring range

Infinity scale and zero scale: Within 0.7% of the scale length
AC voltage : ⫾10% of the maximum reading
Open-circuit voltage : Within 130% of the rated voltage
Rated measuring current: -0% to +20% of 1 mA in the first effective measuring range
Short-circuit current : Within 12 mA

Effect of AC component of voltage at measurement terminals: Within 10% of reading when a capacitor of 5 µF ±10% is

Response time: Within three seconds to reach the tolerance range after resistances equivalent to the central and zero
Instantaneous maximum voltage: No more than 1.5-times the rated measuring voltage.

Effect of temperature: When the ambient temperature is raised to 40°C and lowered to 0°C both from 23°C, variations shall

Effect of humidity: The specified tolerances shall be met after the tester has been left under the condition of 90% relative
Effect of external magnetic field: A change shall be within 3%when the maximum, center, and minimum values of the first

Effect of inclination: Within 2% of the scale length when tested at the infinity scale mark by inclining the tester 90° forward
Effect of external voltage: When an AC voltage 1.2-fold the rated measuring voltage at 50 Hz or 60 Hz is applied between the

Battery voltage: Within the effective battery range (below the battery check mark on the scale plate).
Possible number of measurements: When the measuring time is five seconds each with approximately 25 seconds between

Withstand voltage: 3700 V AC for one minute between the electric circuits and the outer case.
Scale length: Approximately 84 mm
Protection against water, solid matters, and dust penetration: JIS C 0920 compliance,

Vibration proof: When a vibration frequency of 25 Hz and a peak-to-peak amplitude of 1 mm is applied for 20 minutes

Shock proof: When a half-sine pulse shock of a 1000 m/s

Operating temperature/humidity range: 0 to 40⬚C; within 90%RH (no condensation)
Storage temperature/humidity range: - 10 to 60⬚C; within 70% RH (with batteries removed, no condensation)
Battery: Eight AA-size (R6)
External dimensions : Approx. 177×105×55mm
Weight : Approximately 700 g (including batteries)

Safety standards: JIS C 1010-1, JIS C 1010-2-31 (Japanese Industrial Standard)

Measuring Range Measuring Range Mark Measuring Range Measuring Resistance* Current

⫾10% in the second effective measuring range

connected in parallel with a resistor the value of which is determined from the rated measuring voltage
and current, and which is itself connected to the measuring terminals.

scale readings are suddenly applied to the tester.

be within 5% of the scale length at the central scale mark, and within 0.7% at the infinity scale and
zero scale marks.

humidity for one hour.

effective measuring range are indicated and an external field of 400 A/m DC is applied in the most
affected direction.

and backward then to the right and the left from the horizontal.

measuring terminals for 10 seconds with the switch (4) being turned on and then off, there is no
abnormality.

measurements, using manganese batteries and the minimum resistance that can be measured while the
rated measuring voltage is connected.

Model Range Number of measurements
321341 100 V/20 M⍀ Approx. 5,700
321342 250 V/50 M⍀ Approx. 5,300
321343 500 V/100 M⍀ Approx. 3,000
321344 500 V/1000 M⍀ Approx. 3,000
321345 1000 V/2000 M⍀ Approx. 1,000

class IP 20: Foreign substances of 12.5 mm or more in diameter must not enter at all.
(IEC 60529: Degrees of protection provided by enclosures)

in each of three mutually perpendicular directions, in comparison with before the test, the variations
(difference) in error is limited within 100% of the intrinsic error (tolerance).

2

peak acceleration is applied in both forward and reverse
for 6 ms, three times in each of three mutually perpendicular directions—totaling 18 times— in
comparison with before the test, the variations (difference) in error is limited within 100% of the
intrinsic error (tolerance).

Approximately 1.2 kg (including carrying case, strap, measuring lead unit, and batteries)

(Reference: EN61010-1, EN61010-2-31)
Insulation class II, Pollution degree 2
Indoor use, Operating altitude: 2000m max. above sea level
Measurement category: CAT. II

Accessories

Name Model/Part Number Quantity Description
Battery R6P (AA (SUM-3) or equivalent) 8 Contained in the main unit
(1) Measuring lead unit 98050 1 Equipped with both earth and line leads
(2) Carrying case B9600HA 1 With a test lead storage bag
(3) Strap B9303XE 1

• User's manual IM321341-01E 1 This manual

Optional Accessories

GN

NW

NX

NZ

(1)

(3)

(4)

(5)

Name Model/Part Number Description
(4) Probe tip B9600GN General-purpose

(5) Probe tip storage bag B9600NV
(6) Probe with a switch 98051
(7) Lead for guard terminal 321803

B9600NW With a hook
B9600NX With extension
B9600NZ Pointed
B9635JK Pickax-shaped

Supplies

Name Part Number Description
(1) Measuring lead unit 98050 Equipped with both

(2) Carrying case B9600HA With a test lead

• Test lead storage bag B9646CA
(3) Strap B9303XE

earth and line leads

storage bag

Measuring Terminal Voltage Characteristics

700
600
500
400
300
200
100

Measuring Terminal Voltage (V)

321343

321342

321341

0

0.01 0.1 1 10 100
Measuring Resistance (M⍀)

⬁

× 1000

Measuring Terminal Voltage (V)

1.4

1.3

1.2

321345

1.1
1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1
0

0110 100 1000

321344

Measuring Resistance (M⍀)

External Dimensions

Unit: mm

■ Measurement Categories

Measurement category

1

CAT.1

Description
For measurements performed on circuits

Remarks

not directly connected to MAINS.

2

CAT.2

For measurements performed on circuits

Appliances, portable equipments, etc.

directly connected to the low voltage installation.

3

CAT.3

For measurements performed

Distribution board, circuit breaker, etc.

in the building installation.

4

CAT.4

For measurements performed

Overhead wire, cable systems, etc.

at the source of the low-voltage installation.

Entrance
Cable

CAT.

4

■ Outline of Measurement Principle

Meter display

Measurement

switch

Eight AA-size

batteries

High voltage

generator

circuit

Logarithm

conversion circuit

LINE

GUARD

EARTH

JK

⬁

Distribution
Board

Fixed Equipment,
etc.

(6)

(7)

Internal Wiring

CAT.

CAT.

1

Equipment

(2)

3

CAT.

2

T

Outlet

Maximum working voltage

321341 150V AC
321342 250V AC
321343 300V AC, 321344 300V AC, 321345 300V AC

■ Notice Regarding This Manual

1. The contents of this manual are subject to change without prior notice.

2. If any questions arise or errors are found, or if any information is missing from this manual, please inform Yokogawa.

3. Yokogawa is by no means liable for damage resulting from the misuse of this product by the user.

4. This manual is intended to explain the function of this product. Yokogawa does not warrant that the functions will suit a
particular purpose of the user.

IM 321341-01E <2>