Hioki 3157, 3157-01 Instruction Manual

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Melrose, MA 02176

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Toll Free 1-800-517-8431

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INSTRUCTION MANUAL

For...は専用機種。複数の場合は「/」で区切る。不要の場合はとる。

形名を入力。　複数の場合は「/」で区切る。

3157

3157-01

品名を入力。

AC GROUNDING

HiTESTER

August 2012 Revised edition 16 3157A981-16 12-08H

Contents

Introduction i

Inspection

Safety Notes

Notes on Use

Contents and Indications of this Manual

Chapter 1 Overview

1.1 Product Introduction 1

1.2 Features of the 3157

1.3 Names and Functions of Parts

ii

iv

vi

1

Chapter 2 Testing Arrangements 9

2.1 Power Cord Connection 9

2.2 Powering on and off the Unit

2.3 Probe Connection

2.4 Short Bar Connection

2.5 Connecting the REMOTE CONTROL BOX

2.6 Installation Site and Position

2.7 Connection to the Measured Object

2.8 Connection to the 3155 LEAK CURRENT HiTESTER

2.9 Pre-operation Inspection

10
11
12
13
14
15
16
17

i

2
3

Chapter 3 Testing Method 19

3.1 Procedural Flow for Testing and Setting Parameters 20

3.2 Making Testing Arrangements (in READY State)

3.2.1 Setting Output Current Values 23

3.2.2 Setting the Maximum (Minimum) Test Value

3.2.3 Setting the Testing Time

3.2.4 Setting the Output Current Frequency
(in READY State)

3.2.5 Setting the Test Data Count (in READY State)

3.3 Initial Settings for Optional Functions 26

3.4 Zero Adjustment Function

3.5 Key-lock Function

3.6 Examples of Settings

3.7 Starting a Test

3.8 Testing (in TEST State)

3.9 Screening (in PASS State)

3.10 Screening (in FAIL State)

22

23
24

25
25

27
28
29
31
34
35
36

Chapter 4 Optional Functions 37

4.1 Switching the Output Current Frequency 40

4.2 PASS/FAIL Hold Function

4.3 HOLD Function

4.4 Setting the Minimum Test Value

41
42
44

4.5 Endless Timer Function 45

4.6 Test Data Count Function

4.7 Buzzer Setting

4.8 Changing the Current Value in TEST State

4.9 Momentary OUT

4.9.1 Trigger Operation with Switching Probe 50

4.9.2 Momentary OUT Operation with Switching Probe

46
47
48
49

52

4.10 Setting the Test Mode 55

4.10.1 Soft Start Mode 55

4.10.2 Normal Mode

4.10.3 Continuous Test Mode

57
58

4.11 Printer Output 60

4.12 Example of Optional Function Settings

4.13 Example of Optional Functions Use

62
64

Chapter 5 Saving/loading Preset Values 67

5.1 Saving Preset Values 67

5.1.1 Procedure for Saving Data 68

5.1.2 Example of Saving

5.2 Loading Preset Values 71

5.2.1 Procedure for Loading Data 72

5.2.2 Example of Loading

69

73

Chapter 6 External I/O 75

6.1 Signal Line 76

6.2 Timing Chart of External I/O Terminal

80

Chapter 7 Maintenance, Inspection and Ultimate Disposal 83

7.1 Maintenance and Inspection 83

7.2 Fuse Replacement

7.3 Troubleshooting

7.4 Displaying Errors

7.5 Resetting the System

7.6 Ultimate Disposal (Removal of the Lithium Battery)

7.7 External Dimensions

84
85
85
86
87
88

Chapter 8 Specifications 89

8.1 Basic Specifications 89

8.2 General Specifications

91

Appendix APPENDIX1

Appendix 1 Options APPENDIX1

Appendix 1.1 9442 PRINTER APPENDIX1
Appendix 1.2 Probe
Appendix 1.3 9613 REMOTE CONTROL BOX (SINGLE)
Appendix 1.4 9614 REMOTE CONTROL BOX (DUAL)
Appendix 1.5 Interface Board

Appendix 2 Table of Optional Functions APPENDIX4
Appendix 3 Standards

APPENDIX2
APPENDIX2
APPENDIX3
APPENDIX3

APPENDIX5

Index INDEX 1

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Introduction

Thank you for purchasing the HIOKI "3157 AC GROUNDING HiTESTER". To
obtain maximum performance from the product, please read this manual first, and
keep it handy for future reference.

Inspection

When you receive the product, inspect it carefully to ensure that no damage
occurred during shipping. In particular, check the accessories,and connectors. If
damage is evident, or if it fails to operate according to the specifications, contact
your dealer or Hioki representative.

i

NOTE

Checking the main unit and accessories

Main unit

"3157 AC GROUNDING HiTESTER"

Accessories

Verify that the following standard accessories are complete.
(1) Instruction Manual
(2) Spare fuse (built into the power inlet)
(3) Grounded three-core power cord
(4) Short bar (installed between the SOURCE and SENSE terminals)×2

The 9296 CURRENT PROBE and 9297 CURRENT APPLY PROBE are not
included. Please purchase separately according to your needs.

Shipment of the unit

Use the original packing materials when reshipping the product, if possible.

Warranty

HIOKI cannot be responsible for losses caused either directly or indirectly by the
use of the 3157 with other equipment, or if ownership is transferred to a third party.

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Introduction

ii

────────────────────────────────────────────────────

Safety Notes

DANGER

This product is designed to comply with IEC 61010 Safety Standards,
and has been thoroughly tested for safety prior to shipment. However,
mishandling during use could result in injury or death, as well as
damage to the product. Using the product in a way not described in
this manual may negate the provided safety features.
Be certain that you understand the instructions and precautions in the
manual before use. We disclaim any responsibility for accidents or
injuries not resulting directly from product defects.

This manual contains information and warnings essential for safe operation of the
product and for maintaining it in safe operating condition. Before using the product,
be sure to carefully read the following safety notes.

Safety symbols

･

The

should refer to a corresponding topic in the manual (marked with
the

･

In the manual, the

information that the user should read before using the product.

symbol printed on the product indicates that the user

symbol) before using the relevant function.

symbol indicates particularly important

DANGER

WARNING

CAUTION

Indicates a fuse.

Indicates AC (Alternating Current).

Indicates both DC (Direct Current) and AC (Alternating Current).

Indicates the ON side of the power switch.

Indicates the OFF side of the power switch.

The following symbols in this manual indicate the relative importance of cautions
and warnings.

Indicates that incorrect operation presents an extreme hazard that
could result in serious injury or death to the user.

Indicates that incorrect operation presents a significant hazard that
could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of injury to
the user or damage to the product.

NOTE

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Safety Notes

product.

Advisory items related to performance or correct operation of the

iii

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We define measurement tolerances in terms of rdg. (reading) and dgt. (digit) values,
with the following meanings:

rdg. (displayed or indicated value)

The value currently being measured and indicated on the measuring product.

dgt. (resolution)

The smallest displayable unit on a digital measuring product, i.e., the input value
that causes the digital display to show a "1".

Measurement categories

To ensure safe operation of measurement product, IEC 61010 establishes safety
standards for various electrical environments, categorized as CAT II to CAT IV, and
called measurement categories.

CAT II Primary electrical circuits in equipment connected to an AC electrical

outlet by a power cord (portable tools, household appliances, etc.)

CAT II covers directly measuring electrical outlet receptacles.

CAT III Primary electrical circuits of heavy equipment (fixed installations)

connected directly to the distribution panel, and feeders from the

distribution panel to outlets.

CAT IV The circuit from the service drop to the service entrance, and to the power

meter and primary overcurrent protection device (distribution panel).

Using a measurement product in an environment designated with a higher-numbered
category than that for which the product is rated could result in a severe accident,
and must be carefully avoided.
Use of a measurement instrument that is not CAT-rated in CAT II to CAT IV
measurement applications could result in a severe accident, and must be carefully
avoided.

────────────────────────────────────────────────────

Safety Notes

iv

────────────────────────────────────────────────────

Notes on Use

Follow these precautions to ensure safe operation and to obtain the full benefits of
the various functions.



WARNING

Before turning the product on, make sure the source voltage
matches that indicated on the product's power connector.
Connection to an improper supply voltage may damage the product
and present an electrical hazard.



To avoid electrical accidents and to maintain the safety specifications
of this instrument, connect the power cord provided only to a 3­contact (two-conductor + ground) outlet.



To avoid electric shock, do not remove the cover panel. The internal
components of the product carry high voltages and may become very
hot during operation.



To avoid electric shock, do not allow the product to get wet, and do
not use it when your hands are wet.



Replace the fuse only with one of the specified characteristics and
voltage and current ratings. Using a non-specified fuse or shorting
the fuse holder may cause a life-threatening hazard.
(Fuse type: 250 V T3.15 AL)



To avoid electric shock when measuring live lines, wear appropriate
protective gear, such as insulated rubber gloves, boots and a safety
helmet.

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Notes on Use

v

────────────────────────────────────────────────────

･

CAUTION

Before using the product, make sure that the insulation on the

probes(9296 or 9297) is undamaged and that no bare conductors are
improperly exposed. Using the product in such conditions could cause an
electric shock, so contact your dealer or Hioki representative for repair.

･

For safety reasons, only use the optional 9296 or 9297 probe for

measurement.

･

This product should be installed and operated indoors only, between 0

and 40

･

Do not store or use the product where it could be exposed to direct

and 90%RH max.

sunlight, high temperature or humidity, or condensation. Under such
conditions, the product may be damaged and insulation may deteriorate
so that it no longer meets specifications.

･

To avoid electrocution, turn off the power to all devices before plugging or

unplugging any of the interface connectors.

･

To avoid damaging the output cable, grasp the connector, not the cable,

when unplugging the cable from the product.

･

To avoid damaging probes (especially where the leads connect to the

probes), do not kink or pull on the leads.

･

Keep in mind that, in some cases, conductors to be measured may be

hot.

･

Avoid obstructing the ventilation holes on the sides of the 3157, as it could

overheat and be damaged, or cause a fire.

･

To avoid damage to the product, protect it from vibration or shock during

transport and handling, and be especially careful to avoid dropping.

･

Do not insert a board other than optional interface boards into the

Interface slot. The unit software or calibration data may be lost.

･

In the event that the equipment malfunctions in any manner during use,

turn off the power immediately, and contact your dealer or HIOKI
representative.

･

NOTE

Do not use the product near a device that generates a strong electromagnetic field

or electrostatic charge, as these may cause erroneous measurements.

･

This product may cause interference if used in residential areas. Such use

must be avoided unless the user takes special measures to reduce
electromagnetic emissions to prevent interference to the reception of radio
and television broadcasts.

────────────────────────────────────────────────────

Notes on Use

vi

────────────────────────────────────────────────────

Contents and Indications of this Manual

Chapter 1: Overview

Describes an overview, features, and the names and functions of the
parts of the unit.

Chapter 2: Testing Arrangements

Describes particulars of testing arrangements.

Chapter 3: Testing Method

Describes procedures for setting, testing, and test results judgement.

Chapter 4: Optional Functions

Describes procedures for setting optional functions.

Chapter 5: Saving/loading Preset Values

Describes procedure for saving and loading test values.

Chapter 6: External I/O

Describes use of the external I/O.

Chapter 7: Maintenance, Inspection and Ultimate Disposal

Covers the maintenance and inspection, fuse replacement, and ultimate
disposal.

Chapter 8: Specifications

Contains the unit specifications such as the general specifications,
measurement accuracy, etc. of the unit.

Appendix:

Covers the options of the unit and standards.

Indications in the Instruction Manual

Indicates that settings can be made for optional functions.For more information, see
Chapter 4, "Optional Functions."

In this Instruction Manual, the flashing area of the screen is represented in reverse
mode.
In this figure, for example, the current value of 25.0 A flashes.

────────────────────────────────────────────────────

Contents and Indications of this Manual

1

────────────────────────────────────────────────────

Chapter 1

Overview

1.1 Product Introduction

The HIOKI "3157 AC GROUNDING HiTESTER" is designed for protection circuit
testing of a wide range of electrical equipment, including industrial machinery,
medical equipment, and measuring instruments.
Using a constant current system, the HIOKI 3157 provides stable output current.
The unit is capable of accurate four-terminal measurement. The comparator
function, timer function, and screening function permit simple testing, conforming
to technical standards and regulations.

────────────────────────────────────────────────────

1.1 Product Introduction

2

────────────────────────────────────────────────────

1.2 Features of the 3157

(1) Simple testing procedures conforming to technical standards

This unit incorporates a constant current method to provide stable output current.
Voltage drop is measured with four terminals. The 3157 is also equipped with a
function timer and a screening function, using maximum and minimum values,
allowing straightforward testing in conformance with applicable technical standards.

(2) Test data counting function

This function enables test point counting for measured objects that have large
numbers of test points.

(3) Soft-start function

By constantly monitoring current fluctuations, this function checks that the probe is
connected to the measured object. The function also prevents sparking when the
probe is connected to a test point after measurement begins.

(4) Compact and lightweight

With a compact lightweight design, the unit is highly portable and well-suited to
maintenance measurement.

(5) Fluorescent indicator

The large, easy-to-read fluorescent display permits quick checking of the testing
state and result.

(6) Probe

The 3157 is equipped with an alligator-clip probe (the 9296 CURRENT
PROBE) and a switching probe (the 9297 CURRENT APPLY PROBE).
To improve testing efficiency, the push switch on the switching probe
starts testing and inactivates result-checking mode.

(7) Saving testing set values

This unit is provided with a function for saving the set values used in a test,
allowing quick switching between different testing set values to meet a variety of
standards and regulations. Up to 20 values may be saved.

(8) Interface

By using the optional 9593-02 RS-232C and 9518-02 GP-IB INTERFACE boards,
the user can perform automatic testing and save the test results by means of a PC.
Test results can be printed on the optional 9442 PRINTER. Connecting with the
optional 3155 LEAK CURRENT HiTESTER enables testing and the test results can
be saved and printed together with the 3155 leakage current test results.

(9) External I/O

The external I/O terminal generates signals according to the state of the 3157.
It can be used to feed signals for the start and stop key.

────────────────────────────────────────────────────

1.2 Features of the 3157

3

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1.3 Names and Functions of Parts

Front panel

1

5

6

2

3

4

1

Current output terminal

Providing current during a test, this terminal serves as the SOURCE terminal for
four-terminal measurement.

2

Voltage measurement terminal

Used to measure voltage. This terminal serves as the SENSE terminal for
four-terminal measurement.

3

External switch terminal

Used for the switch signal line connected to the switching probe (the 9297
CURRENT APPLY PROBE), the 9613 REMOTE CONTROL BOX(SINGLE) or
the 9614 REMOTE CONTROL BOX(DUAL).

4

Rubber keys

The seven rubber keys include six function keys and a

SHIFT

key.

The six function keys offer a variety of settings, used in combination with the

SHIFT

5

Fluorescent indicator

key.

Displays various kinds of information, such as test state and results.

6

START key

Used to start a test. On starting a test with a preset value, the unit enters TEST
mode. The test starts whether or not the flashing cursor is displayed.

7

STOP key

･

Used to perform forcible ending of a test.

･

Pressing the STOP key when the flashing cursor is displayed causes it to
disappear. To display the flashing cursor again, press the

or key. The

cursor appears, displaying the preset current value.

8

Main power switch

Powers the 3157 on or off.

9

Stand

The 3157 can be tilted up by using this stand.

7

8

9

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1.3 Names and Functions of Parts

4

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Rubber keys (in READY state)

1 2 3 4 5

1

Left/Right cursor key

Moves the flashing cursor. The switching range is preset before shipment: Preset
current value
Frequency.
The key can be set to shift to the minimum test value and the test data count, when
these values are set with the optional functions.
To display the flashing cursor, press the
displaying the preset current value.

2

Up/Down cursor key

Changes the position at which the flashing cursor appears.

3

ON/OFF (Ω/V) key

Switches on/off the set value for the position of the flashing cursor.
However, this key can't perform the switching on/off of the preset current value. If
turned off, the set value is not used in testing.

4

Zero Adjustment key

Use this key to perform zero adjustment within the effective range of adjustment.
The zero adjustment function is active when the 0ADJ lamp is lit.
For zero adjustment procedure, see Section 3.4, "Zero Adjustment Function."

5

SHIFT key

Used in combination with other keys.

Maximum Test Value Testing time Output

or key. The cursor appears,

(1) Switching between voltage and resistance indicators

Press

ON/OFF

(Ω/V) while holding down the

SHIFT

key (

(Ω/V)) to switch between voltage and resistance indicators.

(2) Setting the key lock

Press

SHIFT

+

0ADJ

(LOCK) key to activate key-lock mode.

For more information, see Section 3.5, "Key-lock Function."

(3) Displaying the Preset-data loading screen

Press

SHIFT

+ to display the Preset-data loading screen.

For more information, see Chapter 5, "Saving/loading Preset Values."

(4) Displaying the Preset-data saving screen

Press

SHIFT

+ to display the Preset-data saving screen.

For more information, see Chapter 5, "Saving/loading Preset Values."

(5) Displaying the Optional function setting screen

Press

SHIFT

+

STOP

to display the Optional function setting screen.

For more information, see Chapter 4, "Optional Functions."

SHIFT

+

ON/OFF

────────────────────────────────────────────────────

1.3 Names and Functions of Parts

5

────────────────────────────────────────────────────

Left side view

1

1

Air outlet

Never touch the air outlet. The air outlet is provided with an internal cooling fan.

Right side view

1

2

Rear panel

1

Air inlet

Never touch the air inlet. Air for cooling is drawn through this opening.

2

Handle

This is used for transporting the 3157.

1

2

1

Power inlet

Connect the grounded three-core power cord supplied here. Integrated with a fuse
holder.

2

External I/O terminal

For output of 3157 state and input of start and stop signals.

3

Interface slot

Expansion slot for installation of the optional 9593-02 RS-232C INTERFACER or
9518-02 GP-IB INTERFASE board.

3

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1.3 Names and Functions of Parts

6

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9296 CURRENT PROBE

1 2 3

1

Alligator clip

Clipped to the measured object.

2

Current output plug

Connected to the unit's current output terminal.

3

Banana-type voltage measurement plug

Connected to the unit's voltage measurement terminal.

9297 CURRENT APPLY PROBE

1

2

3

4

1

Push switch

External switch equivalent for the

2

Banana-type voltage measurement plug

Connected to the unit's voltage measurement terminal.

Current output plug

3

Connected to the unit's current output terminal.

Switch signal line plug

4

Connected to the unit's controller terminal.

START

and

STOP

keys.

────────────────────────────────────────────────────

1.3 Names and Functions of Parts

7

────────────────────────────────────────────────────

REMOTE CONTROL BOX

9613 REMOTE CONTROL BOX (SINGLE)

2

1

4

3

9614 REMOTE CONTROL BOX (DUAL)

OPERATE switch

1

2

1

3 2

Used to enable remote-control operation. When this switch is ON, the START and
STOP keys for remote control are active.

2

START key

Works in the same manner as the

START

key on the unit. With the 9614 dual

remote-control box, the two START switches must be pressed.

3

STOP key

Works in the same manner as the

STOP

key on the unit. The STOP key is ON

during a test or when a voltage is being output.

4

Switch signal line plug

Connect to the external switch terminal on the unit.

4

NOTE

Priority for control of the

START

key is in the following order: the external switch,
the external I/O, and the front panel of the unit. Connecting the switch signal line
plug disables the

START

key on the front panel of the unit and the start signal for

the external I/O.

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1.3 Names and Functions of Parts

9

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Chapter 2

Testing Arrangements

2.1 Power Cord Connection

WARNING



The 3157 and the 3157-01 use different rated power voltages. Before
turning the product on, make sure the source voltage matches that
indicated on the product's power connector. Connection to an
improper supply voltage may damage the product and present an
electrical hazard.



To avoid electric shock and ensure safe operation, connect the
power cable to a grounded (3-contact) outlet.

Supply voltage indicated on the rear panel

(1) Be sure that the main power switch is turned to OFF.
(2) Connect the grounded three-core power cord provided to the power inlet on the back

of the unit.

(3) Insert the plug into the grounded outlet.

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2.1 Power Cord Connection

10

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2.2 Powering on and off the Unit

WARNING

NOTE

Before turning the product on, make sure the source voltage matches
that indicated on the product's power connector. Connection to an
improper supply voltage may damage the product and present an
electrical hazard.

･

Allow 10 minutes warming up after powering on.

･

To use the external controller, the external I/O terminal, and the interface, you
must connect them before startup. Only devices or peripherals connected before
startup are activated. Connection following startup may lead to operational or
equipment failure.

For connection procedures, see Section 2.3, "Probe Connection" for the external

controller, Chapter 6, "External I/O" for the external I/O terminal, and the
instruction manual accompanying the interface for each interface.

Powering on the unit

(1) Turn the main power switch to ON（ｌ）.

(2) The model name and version number are displayed as below:

The model name is displayed.

(3) The unit enters READY state five seconds after startup.

Key operation is disabled unless the

Powering off the unit

After the testing has finished, being sure that the
the main power switch on the back of the unit to OFF.
Note that the unit may be damaged if the main power switch is turned to OFF while
the unit is outputting current.

NOTE

The current settings are all preserved when the unit is next turned on. If there has
been a power failure or other malfunction of the power supply, the settings in effect
at the time the malfunction occurred are preserved.

Main power switch

The version number is displayed.
"Version 1.00" is displayed.

READY

lamp is lit.

Indicates active interfaces.

G.01: 9518-02 GP-IB INTERFACE
rS: 9593-02 RS-232C INTERFACE
rS.P: 9442 PRINTER

READY

lamp is turned on, turn

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2.2 Powering on and off the Unit

11

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2.3 Probe Connection



WARNING

To avoid shock and short circuits, turn off all power before

connecting probes.



To avoid electrical accidents, confirm that all connections are secure.
The increased resistance of loose connections can lead to
overheating and fire.

The 9296 CURRENT PROBE (with alligator clip) and 9297 CURRENT APPLY
PROBE are available as optional probes. Connect two sets of the 9296 or a single
combined set of 9296 and 9297.
You can use a custom-built probe. If you do use a custom-built probe, make sure
the wire/cable used for it has sufficient current capacity (AWG 12/cross-sectional

2

area 3.5 mm

min.)

(1) Rotate the current output terminal counter-clockwise to open.

(2) Connect the current output plug as shown in the figure on the left.

(3) Rotate the current output terminal clockwise to close.

(4) Insert the banana-type voltage measurement plug into the voltage

measurement terminal.

(5) With the 9296 CURRENT PROBE, be sure to connect the probe to the other

terminals using the same procedure.
To use the 9297 CURRENT APPLY PROBE, insert the switch signal line
plug into the external switch terminal.

To use the push switch on the 9297 CURRENT APPLY PROBE, use the

･

current output terminal and the voltage measurement terminal on the right,
as shown in the figure.

Make sure the switch signal line plug is correctly oriented. If the plug is

･

dislocated during testing, the unit will enter READY state.

Switch signal line plug

･

NOTE

To activate the push switch, connect the switch signal line plug to the external
switch terminal before startup. For more information on the push switch, see
Section 4.9, "Momentary OUT."

･

The 9297 CURRENT APPLY PROBE can be used unless it is connected to the
external switch terminal. In this case, the push switch cannot be used.

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2.3 Probe Connection

12

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2.4 Short Bar Connection



WARNING

To avoid shock and short circuits, turn off all power before
connecting probes.



To avoid electrical accidents, confirm that all connections are secure.
The increased resistance of loose connections can lead to
overheating and fire.



In a test using two terminals, be sure to use the current output
terminal. Use of the voltage measurement terminal may lead to the
terminal overheating, resulting in burns or equipment damage.

When connecting a probe incompatible with four-terminal measurement, or when
measuring with two terminals, connect the short bar between the voltage measurement
terminal (the SENSE terminal) and the current output terminal (the SOURCE
terminal). Connect to both the voltage measurement terminal and the current output
terminal. In this case, be sure to connect the probe to the current output terminal.

Short bar

(1) Rotate the current output terminal and the voltage measurement terminal

counter-clockwise to open.

(2) Connect the probe and short bar as shown in the figure on the left.

(3) Rotate the current output terminal and the voltage measurement terminal

clockwise to close. Be sure to connect the other terminals using the same
procedure.

In a test using two terminals, be sure to use the current output terminal.

*The figure on the left shows how to connect the probe and the shortbar to the

terminals on the right. The shortbar can be connected to the terminals on the
left in the same manner.

NOTE

Measurement with two terminals will be affected by a voltage drop in the probe,
leading to inaccurate results. Before beginning a test, perform zero adjustment (see
Section 3.4, Zero Adjustment Function).

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2.4 Short Bar Connection

13

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2.5 Connecting the REMOTE CONTROL BOX

WARNING

NOTE

To avoid shock and short circuits, turn off all power before connecting
probes.

To prevent malfunctions, do not remove the remote-control box following startup.
Before removing it, be sure to turn OFF the power.

Connection of the remote-control box (9613/9614) enables start/stop operations to
be performed easily.

(1) Make sure the Main Power switch and OPERATE switch on the remote-control

box are OFF.

Main power switch

OPERATE switch on the remote-control box

(2) Insert the switch signal line plug into the external switch terminal.

Check the direction of the switch signal line.

(3) Turn ON the OPERATE switch of the remote-control box. The OPERATE

switch can be turned ON/OFF even following startup.

External switch terminal

Switch signal line plug

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2.5 Connecting the REMOTE CONTROL BOX

14

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2.6 Installation Site and Position

Place on a stable, flat surface, using the four-footed stand. Orienting the unit
vertically will block its air outlet, greatly increasing the risk of overheating. In
positioning the unit, make sure the air inlet and outlet are kept open.

Stand

Left side view Right side view

NOTE

Air inletAir outlet

･

Do not insert the foreign objects into the air inlet or outlet.

･

Do not apply strong downward pressure with the stand extended. Damage to the

stand will result.

･

Magnetic fields generated by the unit may affect CRT displays. During testing,

keep the current probe away from such subjects.

────────────────────────────────────────────────────

2.6 Installation Site and Position

15

────────────────────────────────────────────────────

2.7 Connection to the Measured Object



WARNING

To avoid burns, never touch the output current terminal, probe tip, or
contact point while testing (i.e., in TEST state).



Take particular care to avoid touching the tip of the current
application probe, which may be quite hot when operating, due to its
small surface area.

(1) Connecting using two 9296 units

Connect one 9296 to the protection ground terminal
on the measured object.
Connect the other 9296 to the test point. Connect
the probe firmly to prevent disconnection during
testing.
During current output, take care to ensure that
adjacent probes do not touch, as this may result in a
short-circuit.

(2) Connecting using a single combined set of

9296 and 9297

Connect the 9296 to the protection ground terminal
on the measured object.
Connect the 9297 to the test point. Connect the
probe firmly to prevent disconnection during testing.
During current output, take care to ensure that
adjacent probes do not touch, as this may result in a
short-circuit.

────────────────────────────────────────────────────

2.7 Connection to the Measured Object

16

)

)

)

)

)

)

AB(

)

)

)

)

)

)

)

)

AB(

)

)

)

────────────────────────────────────────────────────

2.8 Connection to the 3155 LEAK CURRENT HiTESTER

Attaching optional 9593-02 RS-232C INTERFACE to 3157 enables testing when
connected with 3155.
3155 sends command to 3157 to start testing and receives test results when the
3157 testing is complete. The test results can be saved and printed together with
the 3155 leakage current test results.
For usage for the 3155, see 3155 (-01) Instruction Manual.

When connecting 3155 with 3157 (9593-02), use connection cable as specified
below.

3157(9593-02

GND

2
3
4
5
6
7
8

20

BA(TxD
BB(RxD
CA(RTS
CB(CTS
CC(DSR

CF(DCD
CD(DTR

3155

3

BA(TxD

2

BB(RxD

7 CA(RTS

CB(CTS

8

CC(DSR

6

GND

5

CF(DCD

1

CD(DTR

4

Specification: D-subminiature 25-pin male to D-subminiature 9-pin female

connectors, with "crossed" data connections

Settings

(1) Leave power OFF for both 3155 and 3157 while connecting each RS-232C

connector with the RS-232C cable.
(2) Turn the power ON for both 3155 and 3157.
(3) Set up 3157 test settings. Measurement does not start unless the following

conditions are met.

1. Test settings

･

Unit of the maximum and minimum test values: Resistance

･

Test time: ON

･

Maximumtestvalue:ON

When the optional minimum test value setting function is ON.

･

Minimumtestvalue:OFF

2. Optional function setting
Endless timer function: Not set

────────────────────────────────────────────────────

2.8 Connection to the 3155 LEAK CURRENT HiTESTER

17

e

────────────────────────────────────────────────────

2.9 Pre-operation Inspection

By using the optional two sets of the 9296 CURRENT PROBEs or using each of
the 9296 and the 9297 CURRENT APPLY PROBE, the user can perform four­terminal measurement. In this case, the damage on the cable connecting to the
voltage measurement terminal (the SENSE terminal) will affect the measurement
values.
The 3157 cannot detect the open circuit of this voltage measurement cable when
performing four-terminal measurement. So, please follow the pre-operation
inspection below.

Prepare the follows.

･

9296 CURRENT PROBE or 9297 CURRENT APPLY PROBE

･

Resistance measuring device (e.g. tester)

For the 9296, measure the resistance between the alligator clip and the banana-type
voltage measurement plug. For the 9297, measure the resistance between the tip of
the probe and the banana-type voltage measurement plug.
Perform measurement on the two PROBEs to be used for four-terminal
measurement and make sure the resistance values to be under 1Ω and the wires are
not broken.
(The sketch below shows for the 9296 CURRENT PROBE.)

Alligator clip

Tester or etc.

Current output plug

Banana-type voltag

measurement plug

────────────────────────────────────────────────────

2.9 Pre-operation Inspection

19

────────────────────────────────────────────────────

Chapter 3

Testing Method

This chapter describes the procedural flow for testing, making settings, and proper
testing procedure.
Read Chapter 2, "Testing Arrangements" and make the necessary arrangements for
testing.
Press
Setting the optional functions allows testing under various conditions.
For more information, see Chapter 4, "Optional Functions."

SHIFT

+

STOP

to display the Optional function setting screen.

────────────────────────────────────────────────────

20

────────────────────────────────────────────────────

3.1 Procedural Flow for Testing and Setting Parameters

The 3157 is in one of four states:

READY state

The unit is ready for starting a test. The READY lamp is turned on.

To enter TEST state, press the

Setting in READY state

Setting other functions

START

Setting the output current value

Setting the maximum value

Setting the testing time

Setting the minimum value

Setting the output current
frequency or changing the
test count value

Performing zero adjustment

Setting the key-lock function

key while in READY state.

Settings can't be made if the endless timer is set at
"1: Set."

The minimum value can be set if the minimum
test value is set at "1: Set."

The output current frequency can be set only if
the test count value is set at"0: Not set."

Otherwise, setting and display of the test
count value are enabled.

Setting the optional functions allows testing under various conditions.

Press

────────────────────────────────────────────────────

3.1 Procedural Flow for Testing and Setting Parameters

SHIFT

Setting optional functions

+

STOP

to display the Optional Function Setting screen.

Switching the output current
frequency

PASS/FAIL hold function

Hold function

Setting the minimum test value

Endless timer function

Test data count

Setting the buzzer

Changing currents in TEST state

Momentary OUT

Test mode

Printer output

21

────────────────────────────────────────────────────

TEST state

This state indicates that a test is underway. The TEST lamp is turned on. The current preset in the
READY state is output.
The current output value, a decrease in voltage, and resistance are measured and displayed.
The measured values are compared against the comparator values preset in the READY state.

If the measured value deviate from the comparator value, the unit enters FAIL state and halts
measurement.

If the preset testing time completes without the measured value deviating from the comparator value, the
unit enters PASS state.

Key operation in
the TEST status

Changing output
current values

Forced ending

The output current value can be made changeable by
pressing the
"1: Changeable" in TEST status.

Press the STOP key.

and keys if the current is set to

PASS state

PASS indicates that the measured object passed the test set in READY state. The
on. The PASS state screen is displayed for about 1 second before switching to READY state.

Enabling the PASS hold function in the optional settings makes it possible to retain the PASS state. To
check the test results, enable the PASS/FAIL hold function.

To switch the display between resistance and voltage, press

SHIFT

+

ON/OFF

state (see Section 4.2, "PASS/FAIL Hold Function").

PASS

lamp is turned

(Ω/V) while in PASS

FAIL state

FAIL indicates that the measured object failed the test set in READY state. Both the
lamps light when the measured value exceeds the maximum test value. Both

FAIL

and

FAIL

LOWER

and

UPPER

lamps
light when the measured value drops below the minimum test value. The FAIL state screen is displayed
for about 1 second before switching to READY state.

Enabling the FAIL hold function in the optional settings makes it possible to retain the
FAIL state. To check the test results, enable the PASS/FAIL hold function.

To switch the display between resistance and voltage, press

SHIFT

+

ON/OFF

(Ω/V) while

in FAIL state (see Section 4.2, "PASS/FAIL Hold Function").

────────────────────────────────────────────────────

3.1 Procedural Flow for Testing and Setting Parameters

22

────────────────────────────────────────────────────

3.2 Making Testing Arrangements (in READY State)

Make testing arrangements in READY state, including test parameter settings, key­locking, and zero adjustment. Saving and loading for setting data and the setting of
optional functions are made following the READY state. The READY lamp remains
lit to indicate READY state.

Starting and completing settings

Display the flashing cursor to change set values. Press the
display the flashing cursor with the output current value.

or key to

NOTE

Output current value

Output current frequency or test data count

Press the

/ keys to move the flashing cursor through different settings when

Maximum (minimum) test value

it is lit till the cursor reaches the value to be re-set. Then, press the

Testing time

/ keys to
change the settings.
To erase the flashing cursor, or when settings are complete, press the

STOP

key.

The set values can be printed using the printer output function (see Section4.11).

･

The value range that can be set on the flashing cursor depends on the minimum

test value, the state of the endless timer, and the test data count value on optional
settings.
The range set at the factory is as follows: Output current value
test value

･

If STOP signal (key, external I/O, communication) is input, you cannot perform

Testing time Output frequency.

Maximum

the test even though the READY lights.

────────────────────────────────────────────────────

3.2 Making Testing Arrangements (in READY State)

23

────────────────────────────────────────────────────

3.2.1 Setting Output Current Values

(1) If no flashing cursor is displayed in the READY state, press either the key or

the

key to display the cursor while the output current value is lit.

(2) Change output current values using the

/ keys. The value changes in 0.1 A
increments.
To change the value by 1.0 A, press

SHIFT

+ / keys.

The output current value can be set from 3.0 A to 31.0 A.

(3) When settings are complete, press the

STOP

key.

The output current can be changed using the current changeability in TEST
State (see Section 4.8).

3.2.2 Setting the Maximum (Minimum) Test Value

The maximum resistance is displayed.

The maximum resistance is not displayed.

(1) Using the

/ keys, move the flashing cursor to the maximum test value.

(2) Switching between resistance and voltage indicators

The maximum test value can be set for both resistance and voltage. If both are set,
only the one displayed in READY state is activated.
Press

SHIFT

+

ON/OFF

(Ω/V) to switch between resistance and voltage
indicators. (This key operation is valid no matter where the flashing cursor is
located.)

(3) Setting the maximum test value

After selecting between the resistance and the voltage, set the maximum value using
the
To change the value by 0.010 Ω,press

/ keys.

SHIFT

+ / keys (0.10 V when the
voltage is displayed).
Resistance may be set from 0.000 Ω to 2.000 Ω, while voltage may be set from

0.00 V to 6.00 V.
If no maximum test value is required, turn off the

(4) When settings are complete, press the

────────────────────────────────────────────────────

3.2 Making Testing Arrangements (in READY State)

STOP

ON/OFF

key.

key.