Hioki 3174, 3174-01 Instruction Manual

INSTRUCTION MANUAL

3174

3174-01

AC AUTOMATIC

INSULATION

/

WITHSTANDING HiTESTER

Contents

i

Contens

Introduction.................................................................................1

Confirming Packa g e Co n te n ts.............. .. ... ..................... ... ......... 1

Safety Informa tio n ............. .. ...................... .. ...................... .........2

Operating Precautions................................................................4

Chapter 1
Overview ___________________________________ 7

1.1 Product Overview .................................. .......................7

1.2 Features .......................................................................7

1.3 Names and Fu nctions of Parts . ... .. ... ..................... .......9

1.3.1 3174 (3174-01) ................................................................9

1.3.2 Display ..........................................................................12

1.3.3 Model 9615 H.V.Test Lead ...........................................13

1
2
3

1.4 External Dimensions ..................................................14

1.5 Testing Pro c e s s .............. .. ...................... ...................15

Chapter 2
Testing Arrangements ________________________ 17

2.1 Arrangements Work Flow ...........................................17

2.2 Connecting the Protective Conductor Terminal .........18

2.3 Connecting the Power Cord ............................ ...........19

2.4 Connecting the Test Lead ..........................................20

2.4.1 When using the Contact Check Function ......................21

2.4.2 When not using the Contact Check Function ................23

2.5 Turning the Power On and Off ...................................24

2.6 Pre-test Check ............................ ..................... ..........26

Chapter 3
Withstand-Voltage Test _______________________ 29

3.1 Setting the Test-Conditions ........................................31

Appendix

3.1.1 Setting the Test-Voltage Value .....................................32

3.1.2 Setting the Upper (Lower) Limit Value ..........................33

3.1.3 Setting the Test Time Timer ..........................................34

Index

ii

Contents

3.1.4 Setting the Ramp-up (Ramp-down) Time Timer ...........35

3.1.5 Setting the Test-Frequency ......................... ..... .... ..... ...36

3.1.6 Setting the Initial voltage for ramp-up ...........................37

3.1.7 Setting the Confirm a tion Vol ta ge

used for upper and lower-limits for Contact Check .......38

3.2 Starting a Tes t ..... .. .. ...................... .. ...................... .... 4 0

3.3 Terminate the Test .................................................... 42

3.4 Displaying th e T es t Re su lt . .. ... .. ...................... .. ... .. .... 44

3.4.1 "PASS" Determination ..................................................45

3.4.2 "FAIL" Determination ....................................................46

Chapter 4
Insulation-Resistance Test_____________________47

4.1 Setting the Te st Co n dit io ns ......................... ... .. ... ...... 49

4.1.1 Setting the Test-Voltage Value ............................. ..... ...50

4.1.2 Setting the Upper (Lower) Limit Value ..........................51

4.1.3 Setting the Test Time Timer .........................................53

4.1.4 Setting the Delay Time .................................................54

4.1.5 Setting the Confirm a tion Vol ta ge

used for upper and lower-limits for Contact Check .......55

4.2 Starting a Tes t ..... .. .. ...................... .. ...................... .... 5 7

4.3 Terminate the Test .................................................... 59

4.4 Displaying th e T es t Re su lt . .. ... .. ...................... .. ... .. .... 61

4.4.1 "PASS" Determination ..................................................62

4.4.2 "FAIL" Determination ....................................................63

4.4.3 Influence of capacity on the test result (reference data) 65

Chapter 5
Automatic Test ______________________________69

5.1 Setting the Te st Co n dit io ns ......................... ... .. ... ...... 70

5.2 Starting a Tes t ..... .. .. ...................... .. ...................... .... 7 1

5.3 Terminate the Test .................................................... 73

5.4 Displaying th e T es t Re su lt . .. ... .. ...................... .. ... .. .... 75

5.4.1 "PASS" Determination ..................................................76

5.4.2 "FAIL" Determination ....................................................78

Chapter 6
Useful Functions_____________________________79

6.1 Functions for carrying out the tests safely ................. 79

6.1.1 Key-lock Function .........................................................79

6.1.2 Momentary Out .............................................................80

6.1.3 Double Action ................................................................81

6.1.4 START Protection .........................................................82

6.1.5 Output-Voltage Restricting ............................................83

6.2 Display Hold ( H old Fu n ctio n ) ........... .. .. ... ...................84

6.2.1 PASS Hold ....................................................................85

6.2.2 FAIL Hold ......................... ............................ ..... ..... .......86

6.2.3 STOP Hold ....................................................................87

6.3 Evaluate even for forced termination of test ...............88

6.4 Continue testing even after FAIL result is shown

iii

Contents

3

(Continuous Test Mode, Only Withstanding-Test) .....89

6.5 Limiting the FAIL Hold Cancellation (FAIL mode) ......90

6.6 Changing the Output Voltage

during the withstanding test .......................................91

6.7 Insulation-Resistance Test Termination Mode ...........92

6.8 Auto-range for insulation-resistance test ....................95

6.9 Status Out .............................. ...................... .. ............96

Chapter 7
Saving / Loading test conditions ________________ 99

7.1 Saving the Test Conditions ........................................99

7.2 Loading the Test Conditions ....................................102

Chapter 8
External Interface_____________ __________ ____ 103

8.1 Outline of Ex t e r nal I/O .......... .. .. ...................... ..........103

4
5
6
7

8
9

8.1.1 Explanations of signal line ...........................................104

8.1.2 Connecting the External I/O connector .......................106

8.2 Example of Signal Connection .................................107

8.3 Inter-lo ck Fu n ctio n ........ ... ..................... ....................111

8.4 TEST-Signal Output ................ ............... ..................113

8.5 Selecting test mode and
saved test condition 114

8.6 Timing Chart .............................................................115

8.7 Adjusting the Buzzer sound .....................................119

Chapter 9
RS-232C/GP-IB Interface ____________________121

10
11

Appendix

Index

iv

Contents

9.1 Specifications .......................................................... 122

9.2 Connect i o n an d S et tin g Pro c e d ure s ... .. ................... 1 2 3

9.2.1 Connecting the Connector ..........................................123

9.2.2 Setting the Communication Conditions .......................125

9.3 Communication Methods .............................. ...........127

9.3.1 Message Format .........................................................128

9.3.2 Output Queue and Input Buffer ...................................131

9.3.3 Status Byte Register ...................................................132

9.3.4 Event Registers ..........................................................134

9.3.5 Initialization Items ................................... ..... ..... .... ......137

9.3.6 Local Function ............................................................137

9.3.7 Command Reference List ...........................................138

9.4 Message Reference ........................................ .. ...... 142

9.4.1 Common Command ....................................................143

9.4.2 Device-Specific Commands ........................................148

9.4.3 Transmission and response formats ...........................181

9.4.4 Sample program Flowchart .........................................182

9.5 Interface Command "START" ..................................186

Chapter 10
Specifications______________________________187

10.1 Basic Specifications ................................................. 187

10.2 General Specifications .............................................193

10.3 H.V.Test Lead (Accessory) Specifications .............. 194

Chapter 11
Maintenance and Service_____________________195

11.1 Troubleshooting .......................................................195

11.2 Cleaning .................................................................. 196

11.3 Error Indication ........................................................ 197

11.4 System Reset ...... ..................... ...................... ......... 198

Appendix _________________________________ A 1

Appendix1 Remote Control Box..........................................A 1

Appendix2 List of Optional Functions .................................A 5

Index__________________________________ Index i

Introduction

Thank you for purchasing the HIOKI “Model 3174, 3174-01 AC Automatic Insula­tion/Withstanding H iTester.” To obtain maximum performance from the instru­ment, please read this manual first, and keep it handy for future reference.

Confirming Package Contents

• When you receive the in strument, inspect it c arefully to ensu re that no dam­age occurred during shipping. In particular, check the accessories, panel
switches, and connec tor s. If d amage is evident, or if it fails to op er ate acc ord­ing to the specifications, contact your dealer or Hioki representative.

• When transporting the in stru ment, u se the orig inal packing ma terials in wh ich
it was shipped, and pack in a double carto n. Damage oc curring during tr ans­portation is not covered by warranty.

1

Introduction

Model 3174 (-01) AC Automatic Insula­tion/Withstanding HiTester

..........................................................1

Power Cord.......................................1 Slip Prevention Plate.........................1

Instructi on Manual.......................... 1

* The 3174-01 AC A utomatic Insul ation/ Withstan ding H iTester can be used with

GP-IB.

Options  9613 Remote Control Box (Single)

 9614 Remote Control Box (Dual)
 9615 H.V.Test Lead
 9616 Warning Lamp
 9267 Safety Test Data Management Software
 9637 RS-232C Cable (1.8 m, 9-pin to 9-pin)
 9638 RS-232C Cable (1.8 m, 9-pin to 25-pin)
 9151-02 GP-IB Connector Cable (2 m)
 9151-04 GP-IB Connector Cable (4 m)

Model 9615 H.V.Test Lead

.......................... (HIGH/ LOW, 1 each)

2

Safety Information

Safety Information

This instrument is desi gned to comply with IEC 61010 Safety Standards,
and has been thoroughly tested for safe ty prior t o shipment. How ever, mis­handling during use could result in injury or death, as well as damage to
the instrument. Using this instrument in ways other than those specified in
this manual may damage functions which guarantees the safety of this
instrument. 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 instrument defects.

Safety Symbols

This manual contain s information and warnings essential for safe operation of
the instrument and for ma intainin g it in safe ope rating condi tion. Befo re using it,
be sure to carefully read the following safety precautions.

In the manual, the symbol indicates particularly important informa­tion that the user should read before using the instrument.

The symbol printed on the instrument indicates that the user
should refer to a cor responding topic in the manual (marked with the

symbol) before using the relevant function.

Indicates that dangerous voltage may be present at this terminal.

Indicates DC (Direct Current).
Indicates AC (Alternating Curre nt).

Indicates a grounding terminal.

Indicates a protective conductor terminal.

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 operati on pres en ts an extreme haz ­ard 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 instrument.

Indicates advisory ite ms related to performance or corre ct
operation of the instrument.

Other symbols

3

Safety Information

This symbol indicates that the product conforms to safety regulations
set out by the EC Directive.

Indicates a prohibited action.

( p. )

Indicates the location of reference information.
Indicates quick references for operation and remedies for trouble-

shooting.

*

Indicates that descriptive information is provided below.

Accuracy

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

f.s. (maximum display value or scale length)
The maximum d isplaya ble v alue o r scal e len gth. This is usually the na me of t he
currently selected range.
rdg. (reading or displayed value)
The value currently being measured and indicated on the measuring instrument.
dgt. (resolution)
The smallest dis playable unit on a digital measurin g instrument, i.e., the input
value that causes the digital display to show a "1" as the least-significant digit.

Measurement categories (Overvoltage categories)

This instrument complies with CAT I, CAT II safety requirements.
To ensure safe operation of measurement instrument, I
safety standards for various electrical environments, categorized as CAT I to
CAT IV, and called measurement categories. These are defined as follows.

CAT I:

CAT II:

CAT III:

CAT IV:

Secondary electrical circuits connected to an AC electrical outlet
through a transformer or similar instrument.

Primary electrica l circui ts in equip men t connec ted to an AC ele ctr ica l
outlet by a power cord (portable tools, household appliances, etc.)

Primary electrical circuits of heavy equipment (fixed installations)
connected directly to the distribution panel, and feeders from the dis­tribution panel to outlets.

The circuit from the se rvice drop to the servi ce entrance, and to the
power meter and primar y overcu rrent pr otection in strum ent (di stribu­tion panel).

EC 61010 establishes

Higher-numbered catego­ries correspond to electri­cal environments with
greater momentary
energy. So a measurement
instrument designed for
CAT III environments can
endure greater momen­tary energy than a instru­ment designed for CAT II.
Using a measurement instrume nt in an environment designated with a hi gher­numbered category than that for which the instrument is rated c ould result in a
severe accident, and must be carefully avoided.
Never use a CAT I measuring instrument in CAT II, III, or IV environments.
The measurement categories comply with the Overvoltage Categories of the
IEC60664 Standards.

4

Operating Precautions

Operating Precautions

Instrument Installation

Operating temperature and humidity:

Temperature and humidity range for guaranteed accuracy:

Avoid the following locations that could cause an accident or damage
to the instrument.

0 to 40°C at 80% RH or less (no condensation)

23±5°C, 80%RH or less (no condensation)
after 10 minutes minimum warm-up

Installation

Exposed to direct sun­light
Exposed to high tem­perature

Exposed to liquids
Exposed to high hu­midity or condensa­tion

Exposed to high lev­els of particulate dust

• The instrument should be operated only with the bottom side downwards.

In the presence of cor­rosive or explosive
gases

Exposed to strong
electromagnetic fields
Near electromagnetic
radiators

Subject to vibration

Spacing of more
than 10 cm

• Vents must not be obstructed.

Spacing of more
than 10 cm

Ventilation holes

Ventilation holes

5

Operating Precautions

Before Use

Before using the instrument the first time, verify that it operates normally to
ensure that the no damage oc curred during sto rage or shipping. If y ou find any
damage, contact your dealer or Hioki representative.

Before using the instrument, make sure that the insulation on the test
leads is undamaged and that no bare conductors are improperly exposed.
Using the instrument in su ch c o ndi tions co uld cause an elec tric sh ock, so
contact your dealer or Hioki representative for repl acements. (Model 9615
H.V.Test Lead)

Handling the Instrument

• To avoid electric shock, do not remove the instrument's case. The inter-

nal components of the instrument carry high voltages and may become
very hot during operation.

• To avoid damage to the instrument, protect it from physical shock when

transporting and handling. Be especially careful to avoid physical shock
from dropping.

Handling the test leads

• For safety reasons, when taking mea surements, only use the 9615 H.V. Test

Lead provided with the instrument.

• To avoid breaking the test leads, do not bend or pull them.

Safety Precautions during Testing

To prevent electric sho ck, whe n the DANGER lamp is lit or during the test,
never touch the voltage output terminals, test lead, or the tested object.

Tested object

6

Operating Precautions

1.1 Product Overview

Overview Chapter 1

1.1 Product Overview

Inaccuracies i n measurements ha ve been noted to occur during th e withstand­voltage and insulatio n-resistance tests bec ause of variations in the tes t voltage
caused by fluctuations in the voltage supply, breaking of the test leads and
improper connection.
Model 3174, 3174-01 AC Automatic Insulation/Withstanding HiTester is an
affordable insu lation/withstanding testing instrument equipped with stab le volt­age supply and c ontact check fu nction s t o preven t a decr ease in te stin g reliab il­ity caused by these factors.
In addition, to improve the efficiency of the testing process on the production
line, it allows testing setti ngs to be retrieve d from b oth RS-232 C (GP-IB) as well
as EXT I/O.

7

1

Front Panel Rear Panel

1.2 Features

Carry out standards-based tests with simple operations

Once test conditions have been pre-set beforehand, withstanding and insulation­resistance tests w hich meet indu strial st andards ca n be carried out with just the
simple push of a button. Functions such as PASS-FAIL evaluation based on
upper-limit and lower-limit test values, testing time timer, ramp-up/ramp-down
time timer to control voltage fluctuations ensure accurate test results are
obtained.

Saving and loa ding test conditions

Once test conditi ons required for th e various ind ustrial standards and device to
be tested have been saved, tests can be carried out smoothly by just switching
to the required te st conditions. Up to 8 conditions can be saved for the with­standing and insu lation-re sistance te sts respec tively. In a ddition, tes t conditi ons
for the last test are automatically retrieved when the power is switched on.

8

1.2 Features

Automatically carry out consecutive withstanding and insulation­resistance tests

Withstanding and insulation-resistance tests can be carried out consecutively
when the respective test conditions have been pre-set. Pressing the W→I key
will automaticall y run th e withstand ing test f ollowed by the insu lation-resi stance
test, pressing the I→W key will automatically run the insulation-resistance test
followed by the withstanding test.

Contact check function to increase testing reliability

With the contact chec k functi on, the re lia bility o f tests carried o ut impr oves wi th­out the need to incr ease t esting ti me (Ano ther s et of t he 9615 H.V. Tes t Lead is
necessary)

Real execution value shown

By showing t h e r e al ex ec u ti o n v al u e, te st s f a ith f ul t o in dustrial s t an d ar ds ar e car­ried out.

Cutting out influence from supply voltage fluctuations

By using PWM switching power supply, the desired voltage supply can be set so
even if the supply voltage flu ctuates within ±10% of the preset value, the test
voltage will not be affected. This improves the reliability of the test results.

Continuation of testing even after test failure makes analysis of
sample possible (Test Continuation status)

Under normal conditions, testing immediately stops when the test fails, making it
impossible to determine whether the cause is because of a short circuit or a
value exceeding the thresho ld value. The Test Continuation Status allows the
test to continue even after a FAIL r esult is obtained, thus making it possi ble to
analyze the problem.

EXT I/O in standard package

This instrument is equipped with EX T I/O as a standa rd package. This enab les
signal transmissions fro m E XT I/O, start and stop controls of tes ts an d retr i evals
of saved test conditions.

RS-232C (Standard Package)/GP -IB Interface (Standard Package
for 3174-01 only)

This instrument is equipped with RS-232C as a standard package and the 3174­01 is also equipped with GP -IB as a sta ndard package. By connecting to a com­puter, they allow for auto testing to be carried out and test results to be read.

Easy-to-see big screen

Big-sized fluo rescent dis play tubes are use d for the disp lay, allow ing te st c ondi­tions and test results to be confirmed easily.

Remote Control Box for safer test administrations (optional)

When the optional Rem ote Co ntrol Box is conne cted to the instrument, test start
or test stop functions ca n be performed without touching the instrument, thus
making test adm inistr ations s afer. The 961 3 R emote C ontrol B ox ( Single) , 961 4
Remote Control Box (Dual) are available.

9

1.3 Names and Functions of Parts

1.3 Names and Functions of Parts

1.3.1 3174 (3174-01)

Explanations on names and parts of instrument.

Front Panel

DANGER lamp

Light blinks to warn of voltage supply.

To prevent electric shock, when the

DANGER lamp is lit, never touch

the voltage output terminals, test
lead, or the tested object.

Display

(p. 12)

Please carry out the test regularly on th e instrument
by following the test procedures in "2.6 Pre-test
Check" (p. 26).

See "6.1.3 Double Action" (p. 81)

START Key

Start a test.
(Functions only when the lamp is lit.)

STOP Key

Terminate a test.

Operation Keys

(p. 10)

1

Connection terminal for
remote control

Connect the remote con­trol box (optional)

HIGH Voltage output terminal

The HIGH terminal is a high-volt­age terminal for voltage outputs.

LOW Voltage output terminal

The LOW terminal is a low-volt­age terminal for voltage outputs.
It has the same electric potential
as the unit body.

POWER Switch

Turns the instrument on and off.

: Power on
: Power off

(The diagram shows a 3174 AC Au­tomatic Insulation/Withstanding
HiTester.)

10

1.3 Names and Functions of Parts

Operation Keys

Moves the flashing cursor to the left.

Moves the flashing cursor to the right.

Raise the selected value with the flashing cursor.

Lower the selected value with the flashing cursor.

UNLOCK

(LOCAL)

Change the ON/OFF for the selected setting with the flashin g
cursor. If turned off, the set value is not used in testing.

• The following item can't perform the switching on/off:
Withstand-voltage test:
Test-voltage value, Test-voltage frequency, Upper-limit test
value
Insulation-resistance test:
Test-voltage value, Lower-limit test value

Used to lock the keys.
Only the following keys are available during Key Lock. (p. 79)

UNLOCK key (LOCK + SHIFT key)
START key
STOP key

• In the remote state, this key functions as a LOCAL key.
It cancels the remote state.

Used in combination with other keys.

• SHIFT + key
Displaying the loading screen.(p. 102)

• SHIFT + key
Displaying the saving screen.(p. 99)

• SHIFT + LOCK key
Cancels the key lock.
When GP-IB is used for communication, go to LOCAL state.

• SHIFT + / key
Changing the increment size of setting values.

Performs withstand-voltage tests and settings.
"Chapter 3 Withstand- Voltage Test" (p. 29)

Performs insulation-resistance tests and settings.
"Chapter 4 Insulation- Resistance Test" (p. 47)

Tests for withstand-voltage, then insulation-resistance.
"Chapter 5 Automatic Test" (p. 69)

Tests for insulation-resistance, then withstand-voltage.
"Chapter 5 Automatic Test" (p. 69)

Rear Panel

11

1.3 Names and Functions of Parts

1

RS-232C connector

Used for remote con­trol with RS-232C.

Power Inlet

Connect the supplied power cord
here

Protective conductor terminal

Used to earth a protective
ground wire. Be sure to make
grounding connections before
starting a test.

Status Out Relay Terminal

When conditions pre-set in the Status
Out setting are met, the relay connec­tion gets switched ON.

EXT I/O connector

For output of 3174 state
and input of start and stop
signals.

GP-IB connector (3174-01)

Used for remote con trol with
GP-IB.

HIGH voltage output terminal

A high-voltage terminal for volt­age output. Connected to the
HIGH terminal on the front panel.

LOW voltage output terminal

A low-voltage terminal for voltage
output. Contains the sa me electrical
potential as this units casing.

HIGH contact check terminal

A high-voltage terminal for c ontact check.
Use the Slip Prevention Plate.

Buzzer adjustment knob

Used for buzzer sound adjustment.
Two knobs are prov ided: one for PASS
screening and one for FAIL screening.

The diagram shows a 3174- 01 (wi th GP- IB) AC A utomati c Ins ulatio n/With stand­ing HiTester.

LOW contact check terminal

A low-voltage terminal for contact check.

12

.

1.3 Names and Functions of Parts

1.3.2 Display

Test setting conditions and current status of the instrument are shown in the
panel on front of the instrument.

Test type

Test-voltage value

Test-frequency
Initial voltage for ramp-up

SAVE: Saving screen
LOAD: Loading screen

Test type

Test-voltage value

Upper-limit value icon Lights up when indicating the upper-limit test value.
Lower-limit value icon Lights up when indicating the lower-limit test value.

Upper-limit test value
Lower-limit test value

Test time
Ramp-up time
Ramp-down time
Delay time

Test-frequency
Initial voltage for
ramp-up

Upper-limit value icon
Lower-limit value icon

Upper-limit test value
Lower-limit test value

Indicates the current condition of the instrument

: The instrument is ready for starting a test
: The instrument is in the TEST state.
: The tested object passed the test.
: The tested object failed to pass the test.

“AC” lights up during withstanding testing.
“DC” lights up during insulation-resistance testing.

During testing and READY:

Monitors and indicates the voltage of the output ter­minal.

During voltage setting:

Indicates the ea ch item set. (output voltage, Con -

tact Check upper (lower)-limit voltage)
Reverse current cannot b e detected bec ause monitor
shows voltage and residual voltage.

Indicates the upper-limit test value when the upper­limit value icon lights up and indicate s the lower-limit
test value when the lower-limit value icon lights up.
Also indicates the Contact Che ck upper-limit voltage
when [Hi] is shown in Test Frequency and Initial
Ramp-up Voltage, and indicates the Contact Check
lower-limit voltage with [Lo].

Indicates testing time.
Indicates the ramp-up time when [UP] is shown in T est
Frequency and Initi al Ramp -up Voltage, and indicates
the ramp-down time together with [dn].
Indicates the delay time together with [dL] during insu­lation-resistance testing.

Indicates Test Frequency (50 Hz/60 H z) when [Hz] is
shown. Indicates the Initial Voltage (proportion to Test­ing Voltage) when Ramp-up Timer is being used
within the range of 0 to 1.0.

Test time
Ramp-up time
Ramp-down time
Delay time

13

1.3 Names and Functions of Parts

1.3.3 Model 96 15 H.V.Te st Lead

Explanations on names and parts of Test Lead.

To prevent electric sho ck, whe n the DANGER lamp is lit or during the test,
never touch the voltage output terminals, test lead, or the tested object.
There is no insulation/withstand-voltage on the Alligator clip vinyl cover­ing.

Tested object

9615 H.V.Test Lead

1

Alligator Clip

Connect to a test point on the test­ed object.

High-voltage output plug

Connect to the HIGH voltage output
terminal on the instrument.

Alligator Clip

Low-voltage output plug

Connect to the LOW voltage output
terminal on the instrument.

14

1.4 External Dimensions

1.4 External Dimensions

Model 3174, 3174-01 AC Automatic Insulation/Withstanding HiTester

15

1.5 Testing Process

1.5 Testin g Proc e ss

Explanation of the basic flow of withstanding and insulation-resistance tests.

Testing Arrangements
(p. 17)

1. Connect the protective conductor terminal.

2. Connect the power cord.

3. Connect the test lead. (Voltage output terminal, Contact check terminal)

4. T u rn on the power.

5. Carry out pre-test check.

2

1

1

4

ON

3

Tested object

Withstand-voltage test (p. 29) Insulation-resistance test (p. 47)
Select the test type Press the W key. Press the I key.
Set test conditions 1. Set the test voltage value.

(p. 32)

2. Set the upper (lower) limit value.
(p. 33)

3. S et the tes t time timer .
(p. 34)

4. Set the ramp-up (ramp-down)
timer. (p. 35)

5. S et the tes t- freque nc y. (p. 36)

6. Set the Initial voltage for ramp-up.
(p. 37)

Set the upper-limit voltage and lower-limit voltage for Contact Check, if neces­sary.
(p. 38) (p. 55)

1. Set the test voltage value.
(p. 50)

2. Set the upper (lower) limit value.
(p. 51)

3. Set the test time timer.
(p. 53)

4. Set the delay time. (p. 54)

Executing a test Press the START key. (p. 40 ) Press th e START key. (p. 57)

Displaying the test result

or is displayed.

(p. 44)

or is displayed.

(p. 61)

16

1.5 Testing Process

Testing

17

2.1 Arrangements Work Flow

Arrangements Chapter 2

2.1 Arrangements Work Flow

Getting ready to start the test.

2

1

3

2

4

ON

Tested object

1
2
3

4
5

To carry out a safer test

• The Remote Control Box to start or stop the test can be used.

"Appendix1 Remote Control Box" (p. A1)

•

The instrument can be controlled with EXT I/O, RS-232C or GP-IB (only
for 3174-01).

"Chapter 8 External Interface" (p. 103)
"Chapter 9 RS-232C/GP-IB Interface" (p. 121)

"Connecting the Protective Conductor Terminal" (p. 18)

"Connecting the Power Cord" (p. 19)

"Connecting the Test Lead" (p. 20)

"Turning the Power On and Off" (p. 24)

"Pre-test Check" (p. 26)

<Ex.>
Without Contact Check

18

Rear panel

2.2 Connecting the Protective Conductor Terminal

2.2 Connecting the Protective Conductor Termi­nal

To carry out the test safel y, connect the protectiv e conductor termin al found on
the back of the instrument to earth.
If the ground-type dou ble- pole po wer cord that is suppl ied with th e inst rumen t is
used, the instrument is automatically grounded.

T o avoid electric shock, observe the following.

• Connect the protective conductor terminal to earth (earth ground) before
making any other connections.

• Be sure to connect the protective conductor to earth (earth ground).

Connect to
earth

Prepare:

Phillips-head screwdriver,

Earth wire or cable

1. Make sure that the power switch is turned

off.

2. Using a Phillips-head screwdriver, remove

the protective conductor terminal from the
rear of the instrument.

3. Connect an electric wire with a sufficient

current capacity to the protective conduc­tor terminal.
(

A wire with a diameter of more than

2

1.25mm

is recommended.)

4. Secure the wire using a Phillips-head

screwdriver.

5. Ground the other end of the wire or cable.

Protective conductor terminal

2.3 Connecting the Power Cord

Connect the power cor d to the p owe r inl et on the b ack o f the ins trument and the
plug to the wall socket to provide power to the instrument.

To avoid electrical accid ents and to maintain the safety specificati ons of
this instrument, connect the power cord only to a 3-conta ct (two-conduc tor
+ ground) outlet.

Make sure the po wer i s turned off befo re c onn ectin g or disconnecting the power
cord.

Rear panel

1. Make sure that the power switch is turned

off.

19

2.3 Connecting the Power Cord

2

Plug

2. Connect the power cord provided to the

power inlet on the back of the instrument.

3. Insert the plug into the grounded outlet.

Power inlet

20

2.4 Connecting the Test Lead

2.4 Connecting the Test Lead

Connect the 9615 H.V. Test Le ad to the Vo ltage O utput T erminal on the fron t of
the instrument. When using Contact Ch eck, connect to th e Contact Check Te r­minal on the back as well.

• Before using the instrument, make sure that the insulation on the test
leads is undamaged and that no bare conductors are improperly
exposed. Using the instrument in such conditions could cause an elec­tric shock, so contact your dealer or Hioki representative for replace­ments. (Model 9615 H.V.TEST LEAD)

• To avoid shock and short circuits, turn off power before connecting test
leads.

• To avoid electric shock, make sure the test lead is secur ely connected
before starting a test, as a loose test lead can cause a hazard when a
voltage is output.

• Never touch the voltage output term inals, test lead, or th e tested object
during a test (when is light up).

• Voltage may still remain on the voltage output terminal even after the test
has completed. Confirm that no more voltage is left on the voltage output
terminal when touching the voltage output terminals, test lead, or the
tested object.

• To av oid ele ctric sho ck, mak e su re t he power is switched off befor e co n­necting a ferrite or resistor to remove noise.

• Inaccuracy in meas urement m ay occu r during insulati on-resistance test if the

instrument is put in a humi d plac e so try t o avoid d oin g so. If th ere i s a poss i­bility of the test lead becoming too humid, protecting the test lead with desic­cant is recommended. If the test lead touches other metals, leakages in
electric current may i ncreas e so be ca reful when coi ling the test lea d to avoid
touching other parts.

• Do not allow the test l ead used for Contact Check (HIGH, LOW terminal s) to

directly touch the test lead for the voltage output terminals (HIGH, LOW termi­nals) as this may make detecting loose conn ection difficult.

• If the HIGH and LOW voltage output terminals short-circuit or a dielectric

breakdown occurs in the tested object during the test, noise will be generated
and such noise m ay lead to a malfunction of this instrument or o f a nearby
electronic device . If t his p robl em oc cu rs , connect a ferrite core or a r es istor to
the H. V. Test Lead (high voltage side). When using a r esistor, choose one
appropriate for the power rating and withstand voltage. Also, b e alert to any
drop in test voltage.

2.4 Connecting the Test Lead

1.

y

n

y

h

r-

e
e

e

ill

e

2.4.1 When using the Contact Check Function

When using the Contact Check Function, connect the test lead as follows.
On the usage of Contact Check,

ting the Confirmation Voltage used for upper and lower-limits for Contact Check".

To prevent electric sho ck, whe n the DANGER lamp is lit or during the test,
never touch the voltage output terminals, test lead, or the tested object.

Tested object

see "2.6 Pre-test Check" "3 .1.7" "4.1.5 S et-

21

2

When the front terminal is used

The H.V. Test Lead
(low voltage side)

2

3

4

1

When the back terminal is used

5

Remove the LOW voltage output terminal b
turning it counterclockwise.

2. As shown in the left figure, insert the plug o

the H.V. Test Lead (low voltage side).

3. Secure the LOW voltage output terminal b

turning it clockwise.

4. Connect the plug on the H.V. Test Lead (hig

voltage side) to the HIGH voltage output te
minal.

5. Connect in the same way when using th

voltage output terminals on the back of th
instrument as well.

6

7

Tested object

6. Connect the test lead of the LOW voltag

output terminal to the tested object.
Ensure the connection is secure so that it w
not come off during the test.

7. Connect the test lead of the HIGH voltag

output terminal to the tested object as well.

22

8.

i-

st

ct
ct

h
i-

ill

ct

s

-

2.4 Connecting the Test Lead

11

Tested object

Contact check function

By measuring the t erminal voltage of th e tested object, it i s possible to confir m
whether a test voltage is supplied to the tested object or not (Contact check func­tion).
To use the Contact check function, besides the test output terminal, a set of
9615 H.V. Test Lead for test is necessary. (optional)
For this instrument, th e voltage detected by the Contact ch eck terminal will be
differentiated from the test voltage and referred to as the contact voltage.
When the Contact voltage is smaller than the pre- set lowe r-lim it voltage fo r con­tact check, broken wire or poor connection is suspe cted and a contact error wil l
be displayed (Refer to "3.1 .7", "4.1.5 Setting the Confirmation Volta ge used for
upper and lower-limits for Con tac t Che ck", "11 .3 Err or Indi c ati on" for erro rs) . By
setting an upper-lim it voltage for Contact check, d etection for any abnormality
(supply of voltage higher than the pre-set value) in the output voltage is possible.
When the Contact check terminal is conn ected to the test ed object, ens ure that
the test lead for the Contact check do es not directly touch the test lea d for the
test as shown in the di agram (ensure that the test lead for the C ontact check
touches the test lead for the test through the terminal for the tested object).
If the test lead for the Cont act ch eck d irectl y touches the tes t lead for the te st, a
broken wire will be detected but a supply of test voltage to the tested object can­not be confirmed.

• When the contact chec k terminal on the LOW side is connected not to the

• A voltage of approximately DC15 V runs thr ough the contact chec k term inals.

Remove the slip protection plate of the term
nals for Contact Check and connect the te
leads in the same way as steps 2 to 4.

9

8

10

9. Connect the test lead of the LOW Conta

Check terminal to the tested object.
Make sure the probe on the LOW Conta
Check terminal side does not directly touc
the probe on the LOW Voltage Output Term
nal side during this process.
Ensure the connection is secure so that it w
not come off during the test.

10. Connect the probe on the HIGH Conta

Check terminal side to the tested object a
well.

11. Put back the slip protection plate after con

nection.

tested object but to GND , an accurate contact check cannot be carried out.
Ensure that the contact c heck terminal on the LOW side does not touch th e
GND even when it is removed.

During insulation-resistance measurements, when the LOW Contact Check
terminal is connected to the HIGH measurement terminal, a voltage of approx­imately 15 V will be indicated however this is not a malfunction.

2.4 Connecting the Test Lead

When the front terminal is used

2.4.2 When not using the Contact Check Function

When not using the Contact Check Function, connect the test lead as follows.

23

2

The H.V. Test Lead
(low voltage side)

2

3

1

When the back terminal is used

5

4

1. Remove the LOW voltage output terminal

by turning it counterclockwise.

2. As shown in the left figure, insert the plug

on the H.V. Test Lead (low voltage side).

3. Secure the LOW voltage output terminal

by turning it clockwise.

4. Connect the plug on the H.V. Test Lead

(high voltage side) to the HIGH voltage
output terminal.

5. Connect in the same way when using the

voltage output terminal s on the back of the
instrument as well.

6. Connect the test lead of the LOW voltage

output terminal to the tested object.
Ensure the connection is secure so that it
will not come off during the test.

7. Connect the test lead of the HIGH voltage

output terminal to the tested object as
well.

24

2.5 Turning the Power On and Off

2.5 Turning the Power On and Off

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

To avoid dam aging the power cord, grasp the plug, not the cord, when unpl ug­ging it from the power outlet.

• Allow 10 minutes warming up after powering on.

The Remote Control Box, extern al I/O device, RS- 232C interface, and GP-IB
interface are active only when they are connected prior to startup. If these
devices are connected after the power is turne d on, thus causing a malfunc­tion.

• After the power has been switched off, wait for about 5 minutes before turning

on the power again.

Turning Power On

Front panel

25

2.5 Turning the Power On and Off

1. Turn the power switch to on ( ).

2. The “3174” (model name) and software

version are displayed on the screen.

Model name

Software version
(This diagram shows version 1.00.)

State of interface
"rS.0": RS-232C 9600 bps
"rS.1": RS-232C 19200 bps
"G.XX": GP-IB address XX

3. When the lamp is lit (it does not

light up in the Double Action mode), the
keys are ready for operation.

Action" (p. 81)

"6.1.3 Double

2

Turning Power Off

Front panel

1. For safety reasons, check the following.

• Test has completed

•The DANGER lamp is off.

• The lamp is lit.

2. Turn the power switch to off ( ).

26

2.6 Pre-test Check

2.6 Pre-test Check

For safety reasons, check the following before starting test.

START key, STOP key

For safety reasons, switch off the power and pull the electric plug from the
socket before carrying out the check.

1. Press the center of the START key and STOP key in the front panel slowly with

your finger to confirm the feel of the key clicking. Pressing the side of the key will
make it difficult to feel the click.
(The feel of the c lick will be easier to unders tand when y ou press the key a f ew
times or compare it with the STOP key.)

* Feel of the click
When you press the key slowly, you will feel an initial resistance which seems to
be preventing the key from going down further. Press the key harder and you will
feel the clicking of the key.

Breaking current

2. The key is working properly if you feel the click.

3. The key may be damaged if you do not feel the click.

Contact your dealer or Hioki representative.

Before starting the withstanding test, check whether electric current has been
shut out when the pre-set voltage is outputted.

Recommended Insulation: High voltage-high insulat ion flat chip resist ors

GS series (from KOA Corporation) or similar
products
Note the usage voltage and power.

1. Prepare a resistor with a resistance smaller than that of the calculation result

from the test-voltage value and tes t upper- limit tes t value (breaki ng curr ent) that
are preset in the withstand -voltage test. When selecting the resistance, ensure
that the maximum volta ge usage is higher than the test voltage and the rate d
power is higher than the value which is calculated from the test voltage and
resistance values.

(Test-voltage)
(Test-voltage) < Maximum usage voltage of pre-set resistance
Square of test-voltage

÷ (Breaking current) > Resistance

÷ Resistance < Rated power of pre-set resistance

2. Set an upper-limit test value.

3. Connect the resistor that you prepared to the test lead.

4. Start the test. Confirm that the current is cut off whe n the preset voltage is out-

put. (i.e., make sure the instrument is in the FAIL state).

Measured resistance

1. Prepare a resista nce with a val ue which is hig her than t he lo wer-limit te st val ue

2. Set a test voltage.

3. Connect the resistor that you prepared to the test lead.

27

2.6 Pre-test Check

Before starting the in sulat ion-res ista nce test , chec k th at the resi stance va lue for
measurement is the same as the pre-set value.

Recommended Insula tion: High voltage-high insulation flat chip resistors

GS series (from KOA Corporation) or similar
products
Note the usage voltage and power.

but close to it. W hen selec ting the re sist ance, ens ure that th e max imum volta ge
usage is higher than the test voltage and the rated power is higher than the value
which is calculated from the test voltage and resistance values.

(Test-voltage) < Maximum usage voltage of pre-set resistance
Square of test-voltage

÷ Resistance < Rated power of pre-set resistance

2

4. Make sure that the resistance measured matches the resistor that you prepared.

Inter-lock

If the Inter-lock fun ction is set, m ake sure the Inter-lock functi on works proper ly
before starting test.

See "8.3 Inter-lock Function" (p. 111)

Confirming the Contact Check Function

Check whether the Contact Check Function is functioning properly.
For safety reasons, carry out the check only after removing the high voltage
probe on the voltage output terminal side from the instrument.

1. Set the upper-limit and lower-limit voltages of the Contact Check Function.

Withstand-voltage test : "3.1.7 Setting the Confirmation Voltage used for
Insulation-resistance test : "4.1.5 Setting the Confirmation Voltage used for

2. Connect the low voltag e side for probe for Contact Check and lo w voltage side

for probe for voltage ou tput termin al side afte r removing the high v oltage pro be
on the voltage output terminal side.

upper and lower-limits for Contact Check" (p. 38)
upper and lower-limits for Contact Check" (p. 55)

3. Start testing and confirm “ ” appears immediately. Then,

the test is stopped wit h an error number display. T his is the correct functio n of
the contact check.

If the test is comp let ed and either " ", " " , " " or
" " appears, the Contact Check Function is not ON or the instrument is

defective.

4. Start the test after separatin g the low v oltage si de pr o be for Con tac t Che ck from

the low voltage side of the voltage output terminal side probe.
Confirm that there i s a beeping sou nd from the inst rument and /

(Err4) appears. If the test starts, this coul d mean that the Contact Check

Function is OFF or there is a malfunction.

28

2.6 Pre-test Check

Self-testing of the Contact Check Function

After finishing laying ou t the wires for the test, hold down the SHIFT key and
press the START key to start the Contact Check self-testing (The wire layout for
the test is the actual test wire layout or the wire layout used d uring the pre-test
check).

1. Connect the instrument to the tested object following the instructions in "Chapter

2 Testing Arrangements " ( p. 17) in this manual. Connection used in the pr e- test
checks will work as well.

2. Set the test conditions (test voltage, upper and lower e lectric current li mits or

insulation-resis tance upper and l ower limits) fol lowing the ins tructions in "Chap­ter 3 Withstand- Voltage Test" (p. 29), "Chapter 4 Insulation- Resistance Test"
(p. 47) in this manual.

3. Check that the surrounding is clear the n in the READY status, hold down the

SHIFT key and press the START key. Contact Check self-testing will start. The

test-frequency and initial voltage for r amp-up parts will display “CC”. Pressing
the SHIFT and START keys in status other than READY will be ignored.

4. During the self-testing, the following will be checked and if no abnormality is

detected, “ ” wi ll be indicated and the inst ru men t wi ll r etu rn to RE ADY s ta­tus.
If an abnormality is detected, an error n umber (see "11.3 Error I ndication" (p.

197)) will be indicated followed by “ ”.

1. Test voltage check

Check if the output voltage is similar to the pre-set test voltage
Judgement includes error margin of the instrument’s voltmeter

2. Check for volta ge in excess of upper- limit Contact Check voltage for H side

terminal
The instrument will intentionally output a voltage higher than the pre-set Con­tact Check upper-limit voltage to check for excess upper-limit voltage.
This test will not be carr ied out if the Contact Check upper-limit value is n ot
set (during OFF)

3. Check for voltage below lower-limit Contact Check voltage for H side terminal

The instrument will intentiona lly outpu t a voltage l ower than the pre-set Con­tact Check lower-lim it voltage to check for volta ge below the lower-limit vo lt­age.
This test will not be carr ied out if the Contact Check low er-limit value is not
set (during OFF)

• Take note that checks for the L side Contact Check will not be carried out. Be

sure to carry out the check for the L side using the procedures used for pre­test check for the Contact Check Function.

• As the upper-limit vo ltage for Contact Chec k is 5. 00 kV, the judgment may be

inaccurate if the test voltage is set at 5.00 kV.

• As the lower-limit voltage for Contact Chec k is 0.2 0 kV, the judgment may be

inaccurate if the test voltage is set at 0.20 kV.

29

Withstand-

Voltage Test Chapter 3

This chapter describes how to set withstand-voltage test conditions
and the proper testing procedure. Read "Chapter 2 Testing
Arrangements" (p. 17), and make the necessary preparations for
testing.

Refer to "Chapter 5 Automa tic Test" (p. 69) for carrying out withstanding and
insulation-resistance tests consecutively.

To prevent electric sho ck, whe n the DANGER lamp is lit or during the test,
never touch the voltage output terminals, test lead, or the tested object.

3

Tested object

• To prevent electric shocks, do not connect to or remove the test lead
from the tested object when there is a voltage supply during the test.
There is a danger of a voltage higher than the pre-set voltage being sup­plied due to the stabilization function of the voltage output. When this
happens, the instrument may malfunction due to the noise produced.

• The instrument and peripheral electrical devices may not function prop­erly when the tested object’s insulation is broken or when the test lead s
are not connected properly. When this happens, connect a ferrite core or
a resistor to the test lead on the hi gh voltage side. Be careful of a dip in
the test voltage caused by the rated power, withstanding voltage and
resistor when choosing a resistor.

• Wear insulated gloves and confirm that automatic control is off before
changing the tested object or touching the test lead and tested object
directly.

• To in crease test efficienc y, this instrument can be controlled by EXT I/O
or RS-232C and GP-IB and can start tests automatically. As a result, there
is a danger of electric shock accidents. Measures to prevent people from
coming near the instrument or the tested object unintentionally must be
taken when starting the instrument automatically.

• When the tested objec t in use shows dependen cy on voltage (impedance of
ceramic condenser, etc.), the wavefo rms of the output v oltage may become
distorted. The tested object may malfunction depending on the distortion of the
waveforms.

• When the tested object in use possesses an induc tivity like a coil, a voltage
higher than the pre-se t voltage may appear transitionally, causing damage in
the tested object.

30

Select the Withstand-voltage test mode

W

Set test conditions

"3.1.1 Setting the Test-Voltage Value" (p. 32)

"3.1.2 Setting the Upper (Lower) Limit Value" (p. 33)

"3.1.3 Setting the Test Time Timer" (p. 34)

"3.1.4 Setting the Ramp-up (Ramp-down) Time Timer" (p. 35)

"3.1.5 Setting the Test-Frequency" (p. 36)

"3.1.6 Setting the Initial voltage for ramp-up" (p. 37)

Starting a test

Press the START key to start a test. (p. 40)

START

Displaying the test result

PASS

Test result (p. 42)

31

3.1 Setting the Test-Conditions

3.1 Setting the Test-Conditions

For safety reasons, be sure to carry out pre-test check (p. 26) before setting the test conditions.

Setting the test conditions.
Pre-set test conditions can be retrieved to carry out the test.

See "7.2 Loading the Test Conditions" (p. 102)

3

Test setting
state

When lights up on the screen, pressi ng the / key will change the
status to the test conditions status. The test voltage will flash ( will go off).

Set the test conditions in this status.
When Double Action is set, / key is enabled even when is not lit.

test-voltage
value

upper-limit for Contact Check voltage

lower-limit for Contact Check voltage

upper-limit
test value

(Initial voltage for ramp-up)

lower-limit
test value

test-time

ramp-up time

ramp-down time

test-frequency

If the item is not nee ded in the test, se t it to OFF using the ON/OFF key. How­ever, the test-voltage value, the upper-limit test value, and the test-frequency
cannot be set to OFF.
Pre-set test conditions can be saved. (p. 99)
The initial voltage for ramp-up is displayed only when ramp-up time is set.

• In the test setting state, the test cannot start . Test will only start when

lights up.

• Indicates the voltage for the output te rminal in Test-voltage v alue in READY

and test status.

When lights up, READY for EXT I/O turns Lo at the same time.

•

32

3.1 Setting the Test-Conditions

3.1.1 Setting the Test-Voltage Value

Set a test-voltage value. When the test is started, the pre-set voltage will be sup­plied to the tested object from the voltage output terminal via the test lead.
The test will not start if th e load is large and the out put voltage does not re ach

±30 V of the set test-voltage. ( flashes.)
If the output voltage fai ls to rea ch ±30 V of the test -vol tage wit hin app roxi mately
5 seconds after completion of the ramp-up time, the instrument will change to the
FAIL state and the test will be terminated.Also, if the output voltage deviates
from test-voltage and does not re turn to ±30 V of the set value with in 5 se co nds ,
the test is terminated.

1.

2.

When is lit on the screen, press the key to get to the test condi­tions mode.

* When Double Action is set, / key is enabled even when is not lit.

Press the / keys to set the test-voltage value.

or

<Ex.> Set to 0.3 kV.

Setting range: 0.20 to 5.00 kV (The value changes by 0.01 kV.)
To change the value by 0.1 kV, while holding down the SHIFT key, press /

keys.

3.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

STOP

To continue to the setting for the next item, press the key.

• The output voltage can be re st rict ed to prevent accidents caused by imp roper
settings. (When the default is set to 5.00 kV.)

See"6.1.5 Output-Voltage Restricting" (p. 83)

• Note that the instrument do es not start test if the test-voltage valu e is greater
than the output-voltage restricting value.

See"6.1.5 Output-Voltage Restricting" (p. 83)

• The tested object may damage if a v ol tage high er than necessary is supplied.
Be careful when setting the output voltage to ensure that the teste d object
does not receive a voltage higher than necessary.

• The tested object m ay dam age if a voltage is supplie d l ong er than necessary.
Be careful when setting the test time.

• Refer to relevant safety regulations and laws when setting the test voltage
value.

3.1 Setting the Test-Conditions

3.1.2 Setting the Upper (Lower) Limit Va lue

Set a upper-limit test v alue and a lower -limit te st value. For example, when the

upper-limit (lower-limit) test value is set at 10 mA, a “
when

a current less than (more than) 10 mA is supplied to the tested object. If no
lower-limit test value is required, set it to “OFF” using the ON/OFF key. However,
the upper-limit test value cannot be set to OFF.

33

PASS” will be shown

1.

2.

3.

4.

or

or

Press the key t o move t he flas hin g cursor to t he uppe r-li mit test value.

is lit.

Press the / keys to set the upper-limit test value.

<Ex.> Set to 0.2 mA.

Setting range: 0.1 to 20.0 mA (The value changes by 0.1 mA.)
To change the val ue by 1 mA , wh il e h old ing do wn the SHIFT key, press /

keys.

Press the key to move the flashing cursor to the lower-limit test value.

is lit.

Press the / keys to set the lower-limit test value.

3

5.

STOP

Setting range: 0.1 to 19.9 mA (The value changes by 0.1 mA.)

<Ex.> Set to 0.1 mA.

If no lower-limit test value is required, set it to “OFF” using the ON/OFF key.

<Ex.> Set to OFF.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.
To continue to the setting for the next item, press the key.

• The electric current range will be decided by the lower-limit test value (10 mA-

range for “lower-li mit test value ≤ 10.0 mA”, and 20 mA-range for “lower-lim it
test value > 10.0 mA”)

• The setting resolution of the upper (lower)-limit test value is 0.1 mA.

• The current measurement res olution during a tes t depends on the se t upper-

limit test value: 0.01 mA at 0.10 mA to 10.00 mA and 0.1 mA at 10.1 mA to

20.0 mA.

• If the set lower-limit test value is greater than the upper-limit test value,

unable to get out of setting screen. In such a case, correct the upper- or

lower-limit test value.

• A lower-limit test value is not necessary in the withstanding test but pre-setting

it will allow the instrument to be used for simple Contact Checks.

34

3.1 Setting the Test-Conditions

3.1.3 Setting the Test Time Timer

When the test tim e t ime r is s et, the te st wil l auto mat ic al ly run and s top whe n the
time is up. If no test-time timer is required, set it to “OFF” using the ON/OFF key.

1.

2.

or

Press the key to move the flashing curs or to the test-time timer.

Press the / keys to set the test-time timer.

<Ex.> Set to 0.3 s.

Setting range: 0.3 to 999 s

• When the set time scale is 0.3 s to 99.9 s
The value changes by 0.1 s. To change the value by 1 s, while holding down

the SHIFT key, press /

• When the set time scale is 100 s to 999 s
The value changes by 1 s. To ch ange the v alue b y 10 s, while holdin g down

the SHIFT key, press /

If no test-time timer is required, set it to “OFF” using the ON/OFF key.

keys.

keys.

3.

Set to OFF .

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

STOP

To continue to the setting for the next item, press the key.

• The setting resolution of the t est-time timer is 0.1 s between 0.3 and 99.9 s,
and becomes 1 s between 100 and 999 s.

• If a test-time timer has been set, the reduction tim er will operate during the
test.

• If the test-time timer is set to OFF, the time elapsed during the test is dis­played. When this time exce eds 999 s, "- - -" will appea r, but the test will con­tinue.

3.1 Setting the Test-Conditions

3.1.4 Setting the Ramp-up (Ramp-d own) Time Timer

Ramp-up time means the time to increase the voltage until it reaches the set
test-voltage value set in the "Setting the Test-Voltage Value" (p.32). Ramp-down
time means the time to dec rease the voltage upon comp letion of the test time.
When the ramp-u p t ime a nd ra mp-do w n tim e are set, the test voltage durin g t he
test can be controlled.

flashes during th e ramp-up time an d the ramp-down time.If no ramp-up

(ramp-down) time timer is required, set it to “OFF” using the ON/OFF key.

1.

Press the key to move the flashing cursor to the ramp-up time timer.

35

3

2.

3.

4.

Press the / keys to set the ramp-up time timer.

or

<Ex.> Set to 0.1 s.

Setting range: 0.1 to 99.9 s (The value changes by 0.1 s.
If no ramp-up time timer is required, set it to “OFF” using the ON/OFF key.

Press the key to move the flashing cursor to the ramp-down time
timer.

Press the / keys to set the ramp-down time timer.

or

<Ex.> Set to 0.1 s.

Setting range: 0.1 to 99.9 s (The value changes by 0.1 s.)

5.

STOP

If no ramp-down time timer is required, set it to “OFF” using the ON/OFF key.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.
To continue to the setting for the next item, press the key.

• During the ramp-down time, screening using the upper- or lower-limit test
value is invali d.

• A ramp-up time of 0.1 seconds is always inserted even when the ramp-up
time timer is set to OFF.

• Ramp-down time will not be inserted during a forced termination.

• Due to the response time of the ci rcui t, sometimes immediately after the w ith­stand voltage test has started, both the time taken for the output voltage to
reach initial voltage of r amp-up and the time taken for the outp ut voltage to
reach the accurate tes t voltage after the ramp-up time ha s ended, may take
longer, depending on the loads. As a result, the actual test t ime will be; time
taken for the output voltage to reach the ini tial vo ltage level + setting ramp-up
time + time taken for the output voltage to reach the accurate test voltage level
+ test time + ramp-down time.

36

3.1 Setting the Test-Conditions

3.1.5 Setting the Test-Frequency

In the withstand-voltage test, the test-frequency (50 Hz/ 60 Hz AC) can be
selected.

1.

2.

3.

Press the key to move the flashing curs or to the test-frequency.

Press the / keys to set the test-frequency.

or

<Ex.> Set to 50 Hz AC.

Setting range: 50 Hz/ 60 Hz AC

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

STOP

To continue to the setting for the next item, press the key.

3.1 Setting the Test-Conditions

3.1.6 Setting the Initial voltage for ramp-up

When setting the vo lta ge-r ai sing ti me (ramp-up time), the initial value can be s et
by setting it as a p roportion of the test voltag e. The default v alue is 0.0 a nd the
initial voltage for ramp-up is 0 V.

37

1.

2.

Press the key to move the flashing cursor to the Initial voltage for
ramp-up.

3

In the frequency di sp la y, a d oub le- di gi t v ol tage rati o ( p ro porti on of t est voltage)
will be shown to indicate the ramp-up initial voltage setting.

Press the / keys to set the Initial voltage for ramp-up.

or

<Ex.> Set the initial voltage as 0.1 times the test voltage

3.

Setting range: 0.0 to 1.0 (The value changes by 0.1.)

• Setting is not possible when the ramp-up time is OFF.

• When the test is started, a voltage indi cated by the test voltage mu ltipl ied by
the voltage ratio will be outpu tted. After that, it wi ll use the pre-s et “ramp-up
time” to rise almost linearly until the test voltage is achieved.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

STOP

To continue to the setting for the next item, press the key.

• Setting is not possible if the ramp-up time timer is not set.

• If the voltage calculated from a pro por ti on of th e in iti al voltage and t he pre- se t
voltage is less than 100 V, the initial voltage will be 100 V.

• Due to the response time of the ci rcui t, sometimes immediately after the w ith­stand voltage test has started, both the time taken for the output voltage to
reach initial voltage of r amp-up and the time taken for the outp ut voltage to
reach the accurate tes t voltage after the ramp-up time ha s ended, may take
longer, depending on the loads. As a result, the actual test t ime will be; time
taken for the output voltage to reach the ini tial vo ltage level + setting ramp-up
time + time taken for the output voltage to reach the accurate test voltage level
+ test time + ramp-down time.

38

.

3.1 Setting the Test-Conditions

3.1.7 Setting the Confirmation Voltage used for upper and lower-limits for Contact Check

Confirmation Voltage used for upper and lower-limits for Contact Check.
Contact Check can be carried out by measuring the terminal voltage of the
tested object. W hen this functio n is pre-set, test ab normalities ca n be detected
whenever the output vo ltage deviates from the pre-set ranges. The setting for
the upper or lower limit v oltage confirmati on is the same as that us ed for the H
side terminal Contact Chec k, but setting either the upper li mit or the lower limit
will also automatically allow for Contact Checks on the L side terminals.
By measuring the voltage on the H side terminals of the tested object, checks on
whether an accur ate voltage is supplied to t he tes t t er mi nals or n ot (w heth er th e
test lead is properl y connected or not: Contact Check ) can be ca rri ed o ut. W he n
a value outside the range of the pre-set terminal voltage is achieved, an error
number will show and the test will terminate.
When Contact Check Function is not in use, press the ON/OFF key to set to
"OFF".

1.

2.

Press the key to move the flashing cursor to the upper-limit confirma­tion voltage for Conta ct Check.

Press the / keys to set the upper-limit confirmation voltage for Con­tact Check.

or

<Ex.> Set to 0.4 kV

Setting range: 0.20 to 5.00 kV (The value changes by 0.01 kV.)
To change the value by 0.1 kV, while holding down the SHIFT key, press /

keys.
If no upper-limit confirmation voltage for Contact Check is required, set it to

“OFF” using the ON/OFF key.

3.

Press the key to move the flashing cursor to the lower-limit confirma­tion voltage for Contact Check.

39

.

3.1 Setting the Test-Conditions

4.

5.

or

STOP

Press the / keys to set the lower-limit confirmation voltage for Con­tact Check.

<Ex.> Set to 0.2 kV

Setting range: 0.20 to 5.00 kV (The value changes by 0.01 kV.)
To change the value by 0.1 kV, while holding down the SHIFT key, press /

keys.
If no lower-limit confirmation voltage for Contact Check is required, set it to
“OFF” using the ON/OFF key.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.
To continue to the setting for the next item, press the key.

• A value for the Contact Check up per-limit co nfirmation voltage whic h is lower
than the test voltage o r a l owe r-l im it vo ltage which is higher than the test volt­age can be set but during this time, pressing the START key will not start the
test.

• When contact error is detected, the following errors will be displayed and the
test will terminate.

Contact error at the L side terminal

Err4
Err5 Test voltage setting lower than the lower-limit confirmation voltage

(wrong setting)

Err6 Output measurement voltage lower than the lower-limit confirmation

voltage (output abnormality)

Err7 Contact voltage(p. 22) lower than the lower-limit confirmation voltage

(measurement-type malfunction, contact error)

Err8 Pre-set voltage higher than the upper-limit confirmation voltage

(wrong setting)

Err9 Output voltage higher than the upper-limit confirmation voltage

(output-type or measurement-type malfunction)

* Test for Err6 and Err7 will not be carri ed out during ramp-up and ramp-

down.

* When FAIL hol d is no t set, an err or mes sage will appe ar fo r abo ut 0.3 sec-

onds before returning to READY mode.

3

• To prevent ramp-up function and fluctuations in output voltage loads, carry out
the HIGH side terminal Contact Check only after the output voltage has
reached the test voltage value.

• As the upper-limit voltage for Contact Che ck is 5 .00 kV, the judgment may be
inaccurate if the test voltage is set at 5.00 kV.

• As the lower-limit voltage for Co ntact Check is 0.20 kV, the judgment may be
inaccurate if the test voltage is set at 0.20 kV.

• Setting the voltages for the upper-limit and lower-limit Contact Check after tak­ing into account the error margin of this instrument is recommended.

• The detected voltage for the C ontact Check is the average d etected value.
Therefore, if the waveform dis tortions are large, the margins of error from the
test voltage display will also be large.

40

3.2 Starting a Test

3.2 Starting a Test

Carry out the test after finishing setting the test conditions (p. 31).
For safety reasons, key lock is recommended. All keys except the START key
and STOP key are disabled while the key-lock function is active. (p. 79)

T o prevent electric shock, check the following before starting test.

Front panel

• When the tested objec t in use shows depend ency on voltage (impedance of
ceramic condens er, etc.), the waveforms of the output voltage may become
distorted. The tested object may malfunction depending on the distortion of the
waveforms.

• Continuous output of a high v oltage ma y h eat th e bottom of the instrument.

prevent from getting scalded, do not touch the bottom.

•The DANGER lamp is
OFF.

• The lamp is lit
(it is off in the Double
Action mode).

To

• There is a priority hierarchy for the START keys.

Priority hierarchy: Remote Control Box > E XT I/O > Front panel of the 3174
(3174-01)
Note that when a START key with a higher priority is in use, lower-priority
keys are disabled.

• When the tested obje ct in use possess es an inductivity l ike a coil, a voltage
higher than the pre- set voltage may appear tra nsitionally, causing damage i n
the tested object.

• The tested object may damage if a v ol tage high er than necessary is supplied.
Be careful when setting the output voltage to ensure that the teste d object
does not receive a voltage higher than necessary.

• The tested object m ay dam age if a voltage is supplie d l ong er than necessary.
Be careful when setting the test time.

41

3.2 Starting a Test

Double action state

1.

2.

3.

( is lit)

STOP

START

will not be displayed because the default factory setting for this

instrument is Double Action.

is not lit.

Press the STOP key once in the beginning.

When the STOP key is pressed, will be shown for 0.5 seconds.

To start the test, press the START key when is shown.

The DANGER lamp on the front panel of instrument is lit.

3

• flashing on screen : Output voltage rising (within time shown on
ramp-up timer). (FAIL will display if the current
measurement value is higher than the upper-limit
test value.)

• lit up on screen : Output voltage has reached the test voltage. Test
starts.

•“UP”

•“dn”

• To forcibly terminate the test, press the STOP key.

If the DANGER lamp does not go off even after the test has finished, this
could mean that some voltage stronger than the safe voltage (about AC 30
V or DC 60 V) still remains in the voltage output terminal . To prevent elec­tric shock, never touch the voltage output terminals.

Double Action can be released with the Option Setting.
In this case, will be displayed, and the test can be started by just pressing

the START key.

See "6.1.3 Double Action" (p. 81)

display : ramping up

display : ramping down

The instrument will immediately stop outputting a
voltage and switch to the READY state.

Test does not start

• When lower-limit test value ≥ upper-l imit test value,

out of setting screen

• When the output-voltage rest ricting val ue (optiona l function ) < test
voltage value, the test will not start.

See"6.1.5 Output-Voltage Restricting" (p. 83)

To change the output voltage during a test

See "6.6 Changing the Output Voltage during the withstanding test" (p. 91)

To set the upper-limit test voltage for safety reasons
(initial setting at 5.00 kV)

See "6.1.5 Output-Voltage Restricting" (p. 83)

.

unable to get

42

3.3 Terminate the Test

3.3 Terminate the Test

When the test-time is set

Test will automatically stop when the test is carried out during the pre-set
test time.

Front panel

Off

When the test-time has not been set

Press the STOP key to termin ate the test.

Front panel

Off

Forcibly terminate

Pressing the STOP key during the test will forcibly stop the test.

Test forcibly stopped when / judgment is
shown ( all light up)

• During the test, if the output voltage deviates from test-voltage
and does not return to ±30 V of the set value within 5 seconds.

• If the output voltage does not reach ±30 V of the set test-volt­age.

• If the output voltage fails to reach ±30 V of the test-voltage
within approximatel y 5 seconds after comp letion of the r amp-up
time.

or

• If the measured-current v alue exceeds the upp er- or lower-limit
test value during the test-time.

To show test results even when test is forcibly terminated

See "6.3 Evaluate even for forced termination of test" (p. 88)

To hold the value shown when test is forcibly terminated

See "6.2.3 STOP Hold" (p. 87)

43

3.3 Terminate the Test

Never touch the voltage output terminals, test lead, or the tested object
until the DANGER lamp has gone off and the output voltage indicator
shows 0.00V.

Tested object

When a test object that contains a capacity component is subjected to a test, the
object might remain electrically charged, thereby causing an electric shock.

• The instrument does n ot return to the READY state until the DANGER lamp
goes out upon completion of the test. Until the instrument returns to the
READY state, no key operation is accepted.

• With an optional setting, the instrument can change to the READY state,
regardless of the DANGER lamp indication, upon completion of the test.

See"6.1.4 START Protection" (p. 82)

In such a case, the voltage output terminals may contain residu al electricity
even when the instrument is in the READY state.

3

44

Front panel

•The DANGER lamp is

lit
le

3.4 Displaying the Test Result

3.4 Displaying the Test Result

Even following a test, there may be a residual voltage at the output termi­nal. Therefore, to prevent electric shock, check the following before touch­ing the output-voltage termin al, test le ad, or tested o bject, make sure that
no high voltage is being applied between the output terminals.

The test result is displayed on the screen. ”PASS” or “FAIL” screening is c on­ducted based on whether a measured-current value exceeds the upper- or
lower-limit test value within the set test-time.

Display Test result

PASS wil l appear when the current measure ment value is

is lit

is lit

lower than the upper-limit test value and higher than the
lower-limit test value.

FAIL will appear when the current measurement value is

higher than the upper-limit test value or lower than the
lower-limit test value.

OFF.

• The lamp is
(it is off in the Doub
Action mode).

If the output voltage fails to reach ±30 V of the test volt age within approxi mately
5 seconds after the START key is pressed (or after the ramp-up time has
elapsed, if the ram p-up time has been set), the instrum ent returns a UPPER/
LOWER FAIL result.

In the following case s, tests are terminated, and , , and
light up:

• The output voltage does not reach ±30 V of the set test-voltage.

• During the test, the output voltage deviates from test-voltage and does not
return to ±30 V of the set value within 5 seconds.

Test voltage

Initial

voltage for

ramp-up

Ramp-up

time

Set test time

Ramp-down

time

0.03 kV AC

READY

TEST

flashes

TEST

DANGER is lit

TEST

flashes

PASS

3.4.1 "PASS" Determination

Test is successful when lights up.

In the initial setting, will light up for about 0.3 seconds before retu rnin g to
READY mode.

To hold the display

See "6.2.1 PASS Hold" (p. 85)

45

3.4 Displaying the Test Result

3

When test time is set, PASS will appear when the test has completed.
If the ramp-down tim e is se t, the r eductio n timer starts c ounti ng down the ramp ­down time. Upon expiration of the time, the measurement result upon completion
of the test is displayed , and the instrument changes to the PASS state. In the

PASS state, is lit .

46

Remaining test-time (test-time: ON)

F)

3.4 Displaying the Test Result

3.4.2 "FAIL" Determination

Test is unsuccessful when lights up. display will be retained.
(default condition)

When a current 1.5 time s higher than the upper- limit test value is flowing wh ile
performing a withstan d-voltage test, the voltag e is immediately blocked by the
insulation circu it, res ul tin g in an UP PE R F AI L. In s uch cas es , the m eas ur ed cu r­rent value is not displayed correctly. The current value is not displayed, and
“- - - “ will appear.

Voltage-value in the FAIL state

V olt age out put t ime (test-time: OF

Current-value in the FAIL state

Indicates current measurement value
higher than the upper-limit test value

Indicates current measurement value
lower than the lower-limit test value

Indicates test abnormalities such as the
output voltage not reaching the set volt­age.

To return to the READY stat e, press the STOP key, which will cancel the FA IL
Hold function.

To delete the held value shown when the test ended in FAIL.

See "6.2.2 FAIL Hold" (p. 86)

In normal tests, it takes abou t 100 ms for t he instrument to de tect FAIL unti l the
output voltage is OFF.

Test voltage

Initial

voltage for

ramp-up

READY

Ramp-up

time

TEST

flashes

Set test time

DANGER is lit

TEST

Ramp-down

time

※

0.03 kV AC

FAIL

UPPER/LOWER

TEST

※

flashes

47

Insulation-

Resistance Test Chapter 4

This chapter describes how to set insulation-resistance test condi­tions and the proper testing procedure.Read "Chapter 2 Testing
Arrangements" (p. 17), and make the necessary preparations for
testing.

Refer to "Chapter 5 Automati c Test" (p. 69) for carrying out withstandi ng and
insulation-resistan ce tes ts cons ec utivel y .

To prevent electric sho ck, whe n the DANGER lamp is lit or during the test,
never touch the voltage output terminals, test lead, or the tested object.

Tested object

• To prevent electric shocks, do not connect to or remove the test lead
from the tested object when there is a voltage supply during the test.
There is a danger of a voltage higher than the pre-set voltage being sup­plied due to the stabilization function of the voltage output. When this
happens, the instrument may malfunction due to the noise produced.

• The instrument and peripheral electrical devices may not function prop­erly when the tested object’s insulation is broken or when the test lead s
are not connected properly. When this happens, connect a ferrite core or
a resistor to the test lead on the hi gh voltage side. Be careful of a dip in
the test voltage caused by the rated power, withstanding voltage and
resistor when choosing a resistor.

• Wear insulated gloves and confirm that automatic control is off before
changing the tested object or touching the test lead and tested object
directly.

• To in crease test efficienc y, this instrument can be controlled by EXT I/O
or RS-232C and GP-IB and can start tests automatically. As a result, there
is a danger of electric shock accidents. Measures to prevent people from
coming near the instrument or the tested object unintentionally must be
taken when starting the instrument automatically.

4

• When the tested object in use possesses an induc tivity like a coil, a voltage
higher than the pre-se t voltage may appear transitionally, causing damage in
the tested object.

48

Select the insulation-resistance test mode

I

Set test conditions

"4.1.1 Setting the Test-Voltage Value" (p. 50)

"4.1.2 Setting the Upper (Lower) Limit Value" (p. 51)

"4.1.3 Setting the Test Time Timer" (p. 53)

"4.1.4 Setting the Delay Time" (p. 54)

Starting a test

Press the START key to start a test. (p. 57)

START

Displaying the test result

PASS

Test result (p. 59)

49

4.1 Setting the Test Conditions

4.1 Setting the Test Conditions

For safety reasons, be sure to carry out pre-test check (p. 26) before setting the test conditions.

Setting the test conditions.
Pre-set the insulation-resistance test termination mode for the optional functions.

See "6.7 Insulation-Res is t an ce Test Termination Mode" (p. 92)

Pre-set test conditions can be retrieved to carry out the test.

See "7.2 Loading the Test Conditions" (p. 102)

Test setting
state

When lights up on the screen, pressi ng the / key will change the
status to the test conditions status. The test voltage will flash ( will go off).
Set the test conditions in this status.

test-volt­age value

contact check lower-limit voltage

If the item is not needed in the test, set it to OFF using the ON/OFF key. How­ever, the test-voltage value and the lower-limit test value cannot be set to OFF.
Pre-set test conditions can be saved.

See "7.1 Saving the Test Conditions" (p. 99)

lower-limit
test value

upper-limit
test value

test-time

contact check upper-limit voltage

delay time

4

• In the test setting state, the test cannot start . Test will only start when

lights up.

• Indicates the voltage for the output te rminal in Test-voltage v alue in READY

and test status.

When lights up, READY for EXT I/O turns Lo at the same time.

•

50

4.1 Setting the Test Conditions

4.1.1 Setting the Test-Voltage Value

Set a test-voltage value. When the test is started, the pre-set voltage will be sup­plied to the tested object from the voltage output terminal via the test lead. Select
from 500 V and 1000 V.
The test will not start if the load is lar ge and the outp ut volta ge does not r each a
level higher than the set test-voltage. ( flashes.)
If the output voltage dev iates from test-voltage and does not retu rn to a level
higher than the set voltage-value within 5 seconds, the test is terminated.

1.

2.

When is lit on the screen, press the key to get to the test condi­tions mode.

* will not be displayed during the Double Action setting.

Press the / keys to set the test-voltage value.

or

<Ex.> Set to 1000 V.

Set voltage: 500 V/ 1000 V

3.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

STOP

To continue to the setting for the next item, press the key.

• The tested object may damage if a v ol tage high er than necessary is supplied.
Be careful when setting the output voltage to ensure that the teste d object
does not receive a voltage higher than necessary.

• The tested object m ay dam age if a voltage is supplie d l ong er than necessary.
Be careful when setting the test time.

• When the tested object faces a capacity load, the output voltage may become
higher than the pre-set voltage (set the pre-se t voltage 1.2 times lower under
a capacity load of more than 5 μF)

4.1 Setting the Test Conditions

4.1.2 Setting the Upper (Lower) Limit Value

Set a upper-limit tes t value and a lo wer-limit test value. F or example, when t he
lower-limit (upper-limit) test value is set to 100 MΩ, a "PASS" will show if the
measurement resistan ce val ue is more tha n (o r be low ) 100 MΩ. If no uppe r-l imit
test value is required, set it to “OFF” using the ON/OFF key. However, the lower­limit test value cannot be set to OFF.

51

1.

2.

3.

Press the key to move the flashing cursor to the lower-limit test value.

Press the / keys to set the lower-limit test value.

Refer to the next page for the Setting Resolution.

or

4

<Ex.> Set to 100 MΩ.

Guaranteed accuracy range: 0.5 MΩ to 2000 MΩ
Press / keys while holding down the SHIFT key, the value increase s or

decreases 10 times more rapidly than when the SHIFT key is not held down.

Press the key t o move t he flas hin g cursor to t he uppe r-li mit test value.

4.

5.

or

STOP

<Ex.> Set to 2000 MΩ.

Press the / keys to set the upper-limit test value.

Guaranteed accuracy range: 0.5 MΩ to 2000 MΩ
If no upper-limit test value is required, set it to “OFF” using the ON/OFF key.

<Ex.> Set to OFF.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

• If the set lower-limit test value is greater than the upper-limit test value,

unable to get out of setting screen. In such a case, correct the upper- or

lower-limit test value.

• A upper-limit test value is not ne cessary in the insulatio n-resistance test but
pre-setting it will allow the instrument to be used for simple Contact Checks.

52

4.1 Setting the Test Conditions

Upper- or lower-value and Resolution

Setting range

(MΩ)

Setting resolution

(MΩ)

0.20 to 2.00 0.01

2.10 to 20.0 0.1

21.0 to 200 1

210 to 2000 10

Relationship between test voltage, lower-limit test values and
ranges, measurement ranges

Test voltage

(V)

500

1000

Lower-limit test

values (MΩ)

0.20 to 2.00 2 MΩ

Ranges Measurement

ranges (MΩ)

0.17 to 10.0

2.10 to 20.0 20 MΩ 1.70 to 100

21.0 to 200 200 MΩ 17.0 to 1000

210 to 2000 2000 MΩ

1.00 to 4.00 4 MΩ

170 to 2200

0.50 to 20.0

4.10 to 40.0 40 MΩ 3.40 to 200

41.0 to 400 400 MΩ 34.0 to 2000

410 to 2000 2000 MΩ

340 to 2200

*1

*2
*3

*2

*

1: 0.17 to 0.49 Outside confirmed range

*

2: 2001 to 2200 Outside confirmed range

*

3: 0.50 to 0.99 Outside confirmed range

• When the resistance value exceeds the measurement range, it is displayed as
"O.F." (overflow).

• When the set resistance value does not reach the measurement range, values
are displayed on the "U.F." (underflow).

• You can m ake the resistance measurem ent range a fixed range or an auto­matic range.

See"6.8 Auto-range for insulation-resistance test" (p. 95)

• In fixed range measurements, the upper and lower limit values that can be set
in the respective rang es ar e th e v alu es of t he m eas urem ent ra nge s wi thi n th e
reliable guaranteed range for each of the range.
When it is not poss ible to get out of the s etting screen, the up per-limit value
and the lower-limit val ue may be out of th e rang es sh own above. Conf irm the
setting value.

4.1.3 Setting the Test Time Timer

When the test time tim er is se t, th e t est wi ll au toma tic al ly r un an d s top whe n t he
time is up. If no test-time timer is required, set it to “OFF” using the ON/OFF key.

53

4.1 Setting the Test Conditions

1.

2.

Press the key to mo v e the fla s h i n g cu rsor to the test-ti m e tim e r.

Press the / keys to set the test-time timer.

or

4

<Ex.> Set to 0.3 s.

Setting range: 0.3 to 999 s

• When the set time scale is 0.3 s to 99.9 s
The value changes by 0.1 s. To change the value by 1 s, while holding down

the SHIFT key, press / keys.

• When the set time scale is 100 s to 999 s
The value changes b y 1 s. To chan ge the val ue by 10 s, wh ile hol ding do wn

the SHIFT key, press / keys.

If no test-time timer is required, set it to “OFF” using the ON/OFF key.

3.

<Ex.> Set to OFF.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

STOP

To continue to the setting for the next item, press the key.

• Screening is not conducte d for insulation-resistance tests when the test time
timer is set to O FF. However, if "Evaluate even for forced termin ation of tes t"
(p. 88) for an optional function is set, evaluation will be carried out when test is
forcibly terminated. Al so, the time ela psed during the test is displayed. When
this time exceeds 999 s, "- - -" will appear, but the test will continue.

• If a test-time timer has b een set, the reduction timer wi ll operate during the
test.

• When Auto Range is set (see "6.8 Au to-range for insulat ion-resistance test"
(p. 95)), it takes appr oximately 1.5 s for the range to sta bilize after the test

starts. When the set test time is shorter than this, test may end in

.

• If the test time is short, the output voltage may not reach the pres et test volt­age, depending on the tested object.

• When testing a tested object which includes some capacity properties, set the
delay time and test time after factoring in the charging time by using the "Insu­lation-Resistance Test Termination Mode" (p. 92).

54

4.1 Setting the Test Conditions

4.1.4 Setting the Delay Time

Time during which screening is not performed from the start of a test (delay time)
can be set. This is effective when a tested object contains a capacity component.

1.

2.

3.

Press the key to move the flashing curs or to the test-time timer.

Press the key again to display the delay time setting screen.

or

<Ex.> Set to 0.1 s.

Setting range: 0.1 to 99.9 s (The value changes by 0.1 s.)
To change the value by 1 s, while holdin g down the SHIFT key, press /

keys.

If no delay time is required, set it to “OFF” using the ON/OFF key.

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

STOP

To continue to the setting for the next item, press the key.

• After the delay time is se t, if it is turned O FF and turned ON again using th e

ON/OFF key, the delay time returns to the value set before OFF.

• Screening is not conducted for insulation-resistance tests when the tes t time
timer is set to OFF. However, if "Evaluate even for forced te rmination o f test"
(p. 88) for an optional function is set, evaluation will be carried out when test is
forcibly terminated.

• When some capacity propertie s are included to the te sted object, it may take
time for the meas urement v alue to be stabili zed. Set the dela y time appropri­ately to allow the ample time for the measurement value to stabilize.

55

4.1 Setting the Test Conditions

4.1.5 Setting the Confirmation Voltage used for upper and lower-limits for Contact Check

Confirmation Voltage used for upper and lower-limits for Contact Check
Contact Check can be carried out by measuring the terminal voltage of the
tested object. Whe n this function i s pre-set, test abno rmalities can be detected
whenever the output volt age deviates from the pre-set ranges. The setti ng for
the upper or lower lim it voltage confirmati on is the same as t hat used for the H
side terminal Contact Che ck, but setting either the upper limit or the lower limit
will also automatically allow for Contact Checks on the L side terminals.
By measuring the voltage on the H side terminals of the tested object, checks on
whether an accurate voltage is supplied to the tes t terminal s or not (whet her the
test lead is prope rl y co nne cte d or n ot: Conta ct Chec k) ca n be c ar ried out. Wh en
a value outside th e range of the pre-set terminal vo ltage is achieved, an error
number will show and the test will terminate.
When Contact Check F unction is not in use, press the ON/OFF key to set to
"OFF".

4

1.

2.

Press the key to move the flashing cursor to the upper-limit confirma­tion voltage for Contact Check.

When measuring the insulation-resistance, the following values will
automatically be set when the upper-limit Contact Check voltage is set
to ON.

Test-voltage 500 V : Upper-limit voltage 600 V
Test-voltage 1000 V: Upper-limit voltage 1200 V

If no upper-limit confirmation voltage for Contact Check is required, set it to
“OFF” using the ON/OFF key.

56

4.1 Setting the Test Conditions

3.

4.

Press the key to move the flashing cursor to the lower-limit confirma­tion voltage for Contact Check.

When measuring the insulation-resistance, the following values will
automatically be set when the lower -li mit Contact Check voltage is set to
ON.

Test-voltage 500 V : Lower-limit voltage 500 V
Test-voltage 1000 V: Lower-limit voltage 1000 V

If no lower-limit confirmation voltage for Contact Check is required, set it to
“OFF” using the ON/OFF key.

5.

STOP

Press the STOP key to complete the setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

When contact error is detected, the following errors will be displayed and the test
will terminate.

Contact error at the L side terminal

Err4
Err6 Output measurement voltage lower than the lower -limit confirmation

voltage (output abnormality)

Err7 Contact voltage lower than the lower-limit confirmation voltage

(measurement-type malfunction, contact error)

Err9 Output voltage higher than the upper-limit confirmation volta ge

(output-type or measurement-type malfunction)

* When FAIL hold is not s et, an error mess age wi ll appe ar for abo ut 0.5 sec-

onds before returning to READY mode.

4.2 Starting a Test

Carry out the test after finishing setting the test conditions (p. 49).
For safety reasons, ke y lock is recommended. All key s except the START key
and STOP key are disabled while the key-lock function is active.(p. 79)

T o prevent electric shock, check the following before starting test.

57

4.2 Starting a Test

Front panel

After measuring the insulation-resistance for a tested object which has
some capacity properties, t he capacitor of the tested obje ct may become
charged. The instrument will make use of the elect rical dischar ge function
to show a DANGER warning signal until the safety voltage is reached, but
if the electricity is not discharg ed properly, it may cause electrical shocks
or damages to other instruments.

• If a capacity load is applied to the tested object, the output voltage may exceed
the preset voltage, thereby damaging the equipment.

• Continuous output of a high voltage may heat the bottom of the instr ume nt. To
prevent from getting scalded, do not touch the bottom.

•The DANGER lamp is
OFF.

• The lamp is lit
(it is off in the Double
Action mode).

4

• There is a priority hierarchy for the START keys.

Priority hierarchy: Rem ote Control Box > EXT I /O > Front panel of the 31 74
(3174-01)
Note that when a START key with a higher priority is in use, lower-priority
keys are disabled.

• When measuring the insulation-r es istance for a t est ed obj ect w hich has so me
capacity properties, the ou tput voltage may di p bec au se s ome curr ent is used
to charge the capacitor, resulting in inaccurate measurement of the insulation­resistance value. Carry out the test (PASS, F AIL) only when the output voltage
is stable and the delay time has been set.

58

4.2 Starting a Test

Double action state

1.

2.

3.

( is lit)

will not be displayed because the default factory setting for this

instrument is Double Action.

is not lit.

Press the STOP key once in the beginning.

When the STOP key is pressed, will be shown for 0.5 seconds.

STOP

To start the test, press the START key when is shown.

The DANGER lamp on the front panel of instrument is lit.

START

• flashing on screen : Output voltage rising.

• lit up on screen : Output voltage has reached the test voltage. Test
starts.

• To forcibly terminate the test, press the STOP key.

The instrument will immediately stop out putting a voltage and switch to the

READY state.

If the DANGER lamp does not go off even after the test has finished , this
could mean that some voltage stronger than the safe voltage (about 30 V
AC or 60 V DC) still remains in the voltage output terminal. To prevent elec­tric shock, never touch the voltage output terminals.

Test does not start
When lower-limit test value ≥ upper-limit tes t value,

out of setting screen

When the test time is not set, a test judgment will not appear. To forcibly te r-

minate the test, press the STOP key. A test judgement will not be carried out
when the test is forcibly terminated, but it is still possible to do so with the
optional function setting.

See "6.3 Evaluate even for forced termination of test" (p. 88)

.

unable to get

4.3 Terminate the Test

Front panel

When the test-time is set

Test will automatically stop when the test is carried out during the pre-set
test time.

Front panel

Off

When the test-time has not been set

59

4.3 Terminate the Test

4

Press the STOP key to terminate the test.

Off

Forcibly terminate

Pressing the STOP key during the test will forcibly stop the test.

Test forcibly stopped when / judgment is
shown ( all light up)

• During the test, if the output voltage dev iates from test-voltage
and does not return to the set value within 5 seconds.

• If the output voltage does not reach the set test-voltage.

or

• When the test time timer is activated, and a resistance measure­ment value higher or lo wer than the upper and lo wer-limits test
values is reached during testing when “FAIL Completion” is set.

• When the test time timer is activated, and time continues to pass
when a resistance meas urement value high er or lower than the
upper and lower- limits tes t values is reach ed even w hen “Timer
Completion” is set.

• When the test time ti mer is activate d and “PASS Completion” is
set, duration of test time in the case when the resistance mea­surement value is beyond the upper or lower limit values.

To show test results even when test is forcibly terminated.

See "6.3 Evaluate even for forced termination of test" (p. 88)

To hold the value shown when test is forcibly terminated.

See "6.2.3 STOP Hold" (p. 87)

60

4.3 Terminate the Test

Automatic discharge function

This instrument is equipped with a function to discharge residual electric­ity upon termination of the insulation-resistance test (discharge resis­tance: 800 kΩ).
Never touch the voltage output terminals, test lead, or the tested object
until the DANGER lamp goes out.

Tested object

When a test object that contains a capacity component is subjected to a test, the
object might remain electrically charged, thereby causing an electric shock.
The instrument automatically switches to the internal discharge circuit to dis­charge the test obje ct (the DANGER lamp is lit).When the voltage betwee n the
output terminals falls below the safety voltage (approximately 60 V DC), the

DANGER lamp goes out.The lar ger the capacity component of the test obj ect,

the more time is required to discharge the test object.

• The instrument does no t return to the READY state until the D ANGER lam p
goes out upon completion of the test. Until the instrument returns to the
READY state, no key operation is accepted.

• With an optional setting, the instrument can change to the READY state,
regardless of the DANGER lamp indication, upon completion of the test.

See"6.1.4 START Protection" (p. 82)

In such a case, the vo ltage output terminals may con tain residual electricity
even when the instrument is in the READY state.

4.4 Displaying the Test Result

Even following a test, there ma y be a r esidual voltage at the output termi­nal. Therefore, to prevent electric shock, check the following before touch­ing the output-voltage terminal, test lead, or te sted object, make sure that
no high voltage is being applied between the output terminals.

61

4.4 Displaying the Test Result

Front panel

The test result is displayed on the s creen. ”PASS” or “FAIL” screening is con­ducted according to the insulation-resistance test termination mode settings
based on whether a measure d-resistance value exceeded the upper- or lower­limit value.

Display Test result

PASS will appe ar when the resi stance measurement val ue

is lit

is lit

is lower than the upper-lim it test value and higher than the
lower-limit test value.

FAIL will appear when the resistance measurement value is

higher than the upper-limit test value or lower than the
lower-limit test value.

•The DANGER lamp is
OFF.

• The lamp is lit
(it is off in the Double
Action mode).

4

If the output voltage fail s to reach the test voltage within approx imately 5 sec­onds after the START key is pressed, the instrument returns a UPPER/LOWER
FAIL result.

In the following cases, tests are terminated, and , , and
light up:

• If the output voltage does not reach the set test-voltage.

• During the test, if the o utput voltage de viates from tes t-voltage and does n ot
return to the set value within 5 seconds.

62

4.4 Displaying the Test Result

4.4.1 "PASS" Determination

Test is successful when lights up. Under the settings in the insulation-

resistance t est t erm ina ti on mod e, whe n t he r e sis t ance me asu remen t value i s
higher than the lower-limit test value, and lower than the upper-limit test
value, a

PASS will show and the voltage output will stop.

Voltage-value in the PASS state Resistance-value in the PASS state

In the initial setting, will light up for about 0.3 seconds before returning to
READY mode.

To hold the display

See "6.2.1 PASS Hold" (p. 85)

See "6.7 Insulation-Resistance Test Termination Mode" (p. 92)

Installation Flow of PASS determination

(Timer stops: See "6.7 Insulation-Resistance Test Termination
Mode" (p. 92))

Test voltage

Set delay time

(Undetermined

period)

Time to

increase

the voltage

Set test time

Discharge

time

START

READY TEST

TEST

flashes

DANGER is lit

60 V DC

Time

PASS

4.4.2 "FAIL" Determination

Test is unsuccessful when lights up. display will be retained.
(default condition)
The instrument switc hes to the FAIL s tate and stops ou tputting a voltage i f the
measured resistance value deviates from the upper or lower-limit test value.

63

4.4 Displaying the Test Result

Voltage-value in the FAIL state

When the FAIL status is retained, to return to the READY state, press the

STOP key, which will cancel the FA IL Hold function. In normal tests ,

from when the in stru men t a chi ev es a nd det ec ts a F AIL eva lu at ion t o t he time
when the output voltage becomes OFF depends on the size of the capacity
property of the tested object.

Resistance-value in the FAIL state

Indicates resistance measurement value
higher than the upper-limit test value

Indicates resistance measurement value
lower than the lower-limit test value

Indicates test abnormalities such as the
output voltage not reaching the set volt­age.

the time

4

To delete the held value shown when the test ended in FAIL.

See "6.2.2 FAIL Hold" (p. 86)

See "6.7 Insulation-Resistance Test Termination Mode" (p. 92)

64

e

4.4 Displaying the Test Result

Installation Flow of FAIL determination

(Timer stops: See "6.7 Insulation-Resistance Test Termination
Mode" (p. 92))

Test voltage

READY TEST

START

Set delay time

(Undetermined

period)

Time to

increase

the voltage

TEST

flashes

Set test time

Discharge

time

60 V DC

FAIL

（UPPER/LOWER）

Tim

DANGER is lit

• When the optional "Insulation-Resistance Measurement Range" function is
set to "1: Auto Range", it takes up to 1 .5 s to display the resi stance value.

When the test finishes before the preset test time, test m ay end in

.

• When a fixed range is set, “O.F.” will show when the value is beyond the
range’s measurements and “U.F.” will show when the value is lower than the
measurement range.

• During Auto Range evaluation “O.F.”, “U.F.” will be shown when the instru-
ment’s measurement ranges are exceeded.

4.4 Displaying the Test Result

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

)

2200

2175

2199(O.F.)

2154

2199(O.F.)

2097

2199(O.F.)

2100

2086

2116

2057

2124

2025

2160

2000

1987

2015

1966

2019

1918

2043

1900

1883

1905

1863

1908

1829

1920

1800

1789

1811

1766

1815

1745

1826

1700

1688

1710

1679

1723

1639

1729

1600

1591

1607

1568

1612

1551

1612

1500

1492

1506

1480

1508

1457

1522

1400

1393

1406

1384

1408

1359

1412

1300

1292

1307

1287

1310

1270

1317

1200

1194

1299

1185

1207

1172

1210

1100

1095

1103

1090

1106

1080

1201

1000

996

1003

989

1003

976

1005

900

895

901

889

900

883

906

350

349

350

348

350

347

350

Resistance

Capacitance

0.5 μF

1 μF

2 μF

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

)

2000

1955

1985

1940

1999

1926

2023

1900

1857

1891

1844

1898

1818

1912

1800

1768

1787

1757

1793

1729

1814

1700

1677

1689

1661

1699

1635

1711

1600

1571

1590

1561

1595

1538

1605

1500

1477

1494

1466

1499

1454

1518

1400

1379

1394

1372

1398

1354

1409

1000

990

996

987

998

981

1004

900

890

898

887

898

881

903

800

792

799

791

799

784

801

180

178.8

179.1

178.7

179.1

179.1

180

Resistance

Capacitance

0.5 μF

1 μF

2 μF

4.4.3 Influence of capacity on the test result (reference data)

Test conditions

Test mode : Insulation-resistance test mode (Retrieve 100 s worth of data

every 0.1 s in RS-232C Communication)

Load : DECADE RESISTANCE BOX DR1551 0
Capacity load : 0.5 μF, 1.0 μF, 2.0 μF
Range : 2000 M-range (1000 V / 500 V)

400 M, 40 M, 4 M-range (1000 V)
200 M, 20 M, 2 M-range (500 V)

Note: The instrument spec ificatio ns are specific ations for the forward re sistance

loads.
The following fluctuations may occur when measuring the capacity loads.

2000 M-range (output voltage: 1000 V)

65

4

value (MΩ)

value (MΩ)

value (MΩ)

2000 M-range (output voltage: 500 V)

value (MΩ)

value (MΩ)

value (MΩ)

* 2001 M to 2200 M: Outside confirmed range

value (MΩ)

value (MΩ

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ

66

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

)

2000

1941

1983(O.F.)

1901(U.F.)

1981(O.F.)

1829(U.F.)

1981(O.F.)

1900

1795

1905

1760

1866

1760

1981

1800

1697

1793

1729

1829

1671

1831

1700

1639

1699

1639

1699

1558

1761

1600

1533

1585

1509

1698

1486

1697

1500

1378

1486

1419

1486

1398

1535

1400

1359

1401

1340

1399

1303

1420

1000

971

991

971

1013

952

1002

900

880

906

880

906

865

906

800

786

799

779

799

773

807

700

689

700

684

705

684

7053534.7

34.9

34.8

34.9

Resistance

Capacitance

0.5 μF

1 μF

2 μF

34.9

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

)

1000

956

996

975

995

936(U.F.)

995

900

868

885

868

901

852

901

800

770

810

770

796

770

796

700

673

692

673

702

673

702

600

582

597

582

597

575

597

500

487

497

487

497

482

497

400

391

397

388

398

22

Resistance

Capacitance

2 μF

21.9

21.9

21.9

0.5 μF

1 μF

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

)

200

190.5

197.9

190.5

197.9

190.5

197.9

190

183.7

190.7

180.5

187.1

180.5

187.1

180

171.5

177.5

171.5

180.7

177.3

180.7

170

163.1

165.9

166.0

171.6

166.0

171.6

160

156.0

161.0

155.9

160.9

153.4

160.9

150

144.9

151.4

144.9

151.4

147.1

151.4

130

126.8

130.3

125.4

128.6

126.8

128.6

3.5

Resistance

Capacitance

1 μF

2 μF

0.5 μF

3.48

3.48

3.48

4.4 Displaying the Test Result

400 M-range

value (MΩ)

value (MΩ)

value (MΩ)

200 M-range

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ)

* Colored portion: outside scope of reliability.

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ

value (MΩ

value (MΩ)

ーー

40 M-range

value (MΩ)

value (MΩ)

* Colored portion: outside scope of reliability.

value (MΩ)

* Colored portion: outside scope of reliability.

value (MΩ)

value (MΩ)

value (MΩ

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

)

100

95.6

99.3

97.6

99.5(O.F.)

97.4

99.4(O.F.)

90

87.6

89.2

87.5

89.1

87.5

90.7

80

78.3

82.1

77.0

80.7

77.1

80.8

70

67.0

68.9

68.9

69.9

67.1

69.9

60

58.6

60.0

59.4

60.1

59.4

60.1

50

49.2

49.7

49.2

49.7

48.7

49.2

1.8

1.79

1.79

1.79

0.5 μF

Capacitance

Resistance

value (MΩ)

2 μF

1 μF

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

)

20

19.91

19.92

19.54

19.92

19.14

19.89

19

18.47

19.16

18.80

19.18

18.46

19.16

18

17.87

17.94

17.86

17.90

17.52

18.16

17

16.88

16.95

16.88

16.95

16.41

16.68

16

15.87

15.91

15.91

15.94

15.43

16.17

12

11.91

11.95

11.91

11.95

11.89

12.05

1

1.00

1.00

1.00

Resistance

Capacitance

0.5 μF

1 μF

2 μF

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

)

10

9.80

10.00

9.80

10.00(O.F.)

9.80

10.00(O.F.)

9

8.81

8.96

8.65

9.12

8.65

9.11

8

7.87

8.12

7.75

7.87

7.75

8.12

7

6.93

7.02

6.74

6.92

6.74

6.92

6

5.97

6.04

5.97

6.04

5.90

6.04

2

1.99

2.00

1.99

2.00

1.99

2.00

0.5

Resistance

Capacitance

1 μF

2 μF

0.5 μF

0.50

0.50

0.50

67

4.4 Displaying the Test Result

20 M-range

value (MΩ)

value (MΩ)

4 M-range

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ)

* Colored portion: outside scope of reliability.

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ)

value (MΩ

value (MΩ

4

value (MΩ)

2 M-range

value (MΩ)

value (MΩ)

* Colored portion: outside scope of reliability.

value (MΩ)

* Colored portion: outside scope of reliability.

value (MΩ)

value (MΩ)

value (MΩ

68

4.4 Displaying the Test Result

69

10

Automatic Test Chapter 5

In the continuous test, withstand-voltage and insulation-resistance
tests are conducted successively. Read "Chapter 3 Withstand­Voltage Test" (p. 29) and "Chapter 4 Insulation- Resistance Test"
(p. 47), and set the test conditions.

Set each test condition

Withstand-voltage test"3.1 Setting the Test-Conditions" (p. 31)

insulation-resistance test"4.1 Setting the Test Conditions" (p. 49)

Select the test mode

W→I

Starting a test

Withstand-voltage test

↓

Insulation-resistance test

START

I→W

Press the START key to start a test. (p. 71)

Insulation-resistance test

↓

Withstand-voltage test

5

8
9

Displaying the test result

11

PASS

付録

Test result (p. 73)

索引

70

5.1 Setting the Test Conditions

5.1 Setting the Test Conditions

For safety reas o ns , be su r e to ca rr y ou t pr e -te st check (p. 26) before se tt ing the test conditions.

Setting the test conditions.
To set or change the test conditions, do so in the test setting mode for the
respective withstanding and insulation-resistance tests.

Withstand-voltage test : "3.1 Setting the Test-Conditions" (p. 31)
Insulation-resistance test : "4.1 Setting the Test Conditions" (p. 49)

• If the test time is set to OFF in the withstand-voltage mod e or in su lat ion -res i s­tance mode, the test mode with its time set to OFF is dis pl ay ed (OFF flashes)
upon startup of the test in th e Auto t est mode, an d the tes t canno t be started.
Return to withstand-voltage or insulation-resistance mode, and set the test
time to ON.

• When setting for the current or r esistance v alue is s et at lower-li mit tes t valu e

≥ upper-limit test valu e, each va lue wil l flash when the tes t starts and the set-

ting screen will freeze, making it impossible to get out.

• If the test-voltage value is greater than the output-voltage restricting value,
unable to get out of setting screen.

See"6.1.5 Output-Voltage Restricting" (p. 83)

10

5.2 Starting a Test

Carry out the test after finishing setting the test conditions.
For safety reasons, ke y lock is recommended. All key s except the START key
and STOP key are disabled while the key-lock function is active.(p. 79)

To prevent electric shock, check the following before starting test.

71

5.2 Starting a Test

Front panel

• If a capacity load is applied to the tested object, the output voltage may exceed
the preset voltage, thereby damaging the equipment.

• Continuous output of a high voltage m ay hea t th e bo ttom of th e i ns trume nt. To
prevent from getting scalded, do not touch the bottom.

There is a priority hierarchy for the START keys.

Priority hierarchy: Remote Control Box > EXT I/O > Front panel of the 3174
(3174-01)
Note that when a START key with a higher prior ity is in use, lower-pr iority keys
are disabled.

•The DANGER lamp is
OFF.

• The lamp is lit
(it is off in the Double
Action mode).

5

8
9

11

付録

索引

72

5.2 Starting a Test

Double action state

1.

2.

3.

( is lit)

will not be displayed because the default factory setting for this

instrument is Double Action.

is not lit.

Press the STOP key once in the beginning.

When the STOP key is pressed, will be shown for 0.5 seconds.

STOP

To start the test, press the START key when is shown.

The DANGER lamp on the front panel of instrument is lit.

START

In W → I mode, the test order is Withstand-voltage test → Insulation-resistance
test.
In I → W mode, the test order is Insulation-resistance test → Withstand-voltage
test.

• To forcibly terminate the test, press the STOP key.
The instrument will immediately stop out putting a voltage and switch to the

READY state.

If the DANGER lamp does not go off even after the test has finished , this
could mean that some voltage stronger than the safe voltage (about AC 30
V or DC 60 V) still remains in the voltage output terminal. To prevent elec­tric shock, never touch the voltage output terminals.

Test does not start

• When lower-lim it test value
will flash when the test starts and the s etting screen will freeze,
making it impossible to get out.

• When the output-voltage restricting value (optional function) <
test voltage value, unable to get out of setting screen.

See"6.1.5 Output-Voltage Restricting" (p. 83)

≥ upper-limit test val ue, each value

To set the upper-limit test voltage for safety reasons
(initial setting at 5.00 kV)

See "6.1.5 Output-Voltage Restricting" (p. 83)

10

5.3 Terminate the Test

Automatically stops when the withstanding test and insulation-resistance
test stop.

Front panel

Off

73

5.3 Terminate the Test

Forcibly terminate

Press the STOP key to terminate the test.

Test forcibly stopped when / judgment is
shown ( all light up)
In the withstand-voltage test:

• During the test, if the output vo ltage deviates from test-voltage
and does not return to ±30 V of the set value within 5 seconds.

• If the test voltage does not reach ±30 V of the set test-voltage.

In the insulation-resistance test:

• During the test, if the output vo ltage deviates from test-voltage
and does not return to the set value within 5 seconds.

• If the test-voltage does not reach the set test-voltage.

or

• In the withstand-voltage test, if the measured-current value
exceeds the upper- or lower-limit test value during the test-time.

• In the insulation-resistance tes t, when the te st time timer is acti­vated, and a resistance measurement value higher or lower than
the upper and lower- limits test values is r eached during testi ng
when “FAIL Completion” is set.

• In the insulation-resistance test, whe n the test ti me timer i s acti­vated, and time contin ues to pass when a resistance measure­ment value higher or lo wer than the upper and lo wer-limits test
values is reached even when “Timer Completion” is set.

• In the insulation-resis tance test, when the test ti me timer i s acti­vated and “PASS Completion” is set, duration of test time in the
case when the resistance measurement value is beyond the
upper or lower limit values.

5

8
9

11

To hold the value shown when test is forcibly terminated.

See "6.2.3 STOP Hold" (p. 87)

付録

During consecutiv e testing, a test judgment in a forced termination cannot be
carried out.

索引

74

5.3 Terminate the Test

Automatic discharge function

This instrument is equipped with a function to discharge residual electric­ity upon termination of the insulation-resistance test (discharge resis­tance: 800 kΩ).
Never touch the voltage output terminals, test lead, or the tested object
until the DANGER lamp goes out.

Tested object

When a test object that contains a capacity component is subjected to a test, the
object might remain electrically charged, thereby causing an electric shock.
The instrument automatically switches to the internal discharge circuit to dis­charge the test object ( the DANGER lamp is lit). When the volt age between th e
output terminals fal ls below the safety v oltage (approximately 30 V AC or 60 V
DC), the DANGER lamp goes out. The larger the capacity component of the test
object, the more time is required to discharge the test object.

•In W → I mode, the insulation-resistance tes t does not start up if the voltage
between the output terminals has not fallen below the safety voltage (approxi­mately 30 V AC) upon completion of the withstand-voltage test.

•In I → W mode, the withstand-voltage test does not start until the voltage
between the output terminals has fallen below the safety voltage (approxi­mately 60 V DC) upon completion of the insulation-resistance test.

• The instrument does no t return to the READY state until the DANGER lamp
goes out upon completion of the test. Until the instrument returns to the
READY state, no key operation is accepted.

• With an optional setting, the instrument can change to the READY state,
regardless of the DANGER lamp indication, upon completion of the test.

See"6.1.4 START Protection" (p. 82)

In such a case, the vo ltage output terminals may con tain residual electricity
even when the instrument is in the READY state.

10

5.4 Displaying the Test Result

Even following a test, there ma y be a r esidual voltage at the output termi­nal. Therefore, to prevent electric shock, check the following before touch­ing the output-voltage terminal, test lead, or te sted object, make sure that
no high voltage is being applied between the output terminals.

75

5.4 Displaying the Test Result

Front panel

Display Test result

is lit

is lit

In the following cases, tests are terminated, and , , and
light up:
In the withstand-voltage test:

• During the test, the output voltage deviates from test-voltage and does not
return to ±30 V of the set value within 5 seconds.

• If the test-voltage does not reach ±30 V of the set test-voltage.

In the insulation-resistance test:

• During the test, if the output voltage deviates from test-voltage and does not
return to the set value within 5 seconds.

• If the test-voltage does not reach the set test-voltage.

Both the withstand-voltage and insulation-resistance tests
were passed.

Either the withstand-voltage or insulation-resistance test
was failed.

•The DANGER lamp is
OFF.

• The lamp is lit
(it is off in the Double
Action mode).

5

8
9

When PASS hold and FAIL hold fo r optional functions ar e set, pressing the W
key or the I key when the test has stopped enables the respective tes t results to
be confirmed. Tests results for tests not carried out cannot be confirmed then.

See "6.2.1 PASS Hold" (p. 85)
See "6.2.2 F AIL Hold" (p. 86)

If the first test sh ows FAIL in the autom atic test mode, the next test will not be
carried out.

11

付録

索引

76

5.4 Displaying the Test Result

5.4.1 "PASS" Determination

Test is successful when lights up.

will light up for about 0.3 seconds before returning to READY mode.

To hold the display

See "6.2.1 PASS Hold" (p. 85)

A PASS will be shown when both the withstanding and insulation-resistance
tests pass upon completion of the tests.
If the ramp-down tim e is set , the r educt ion ti mer star ts coun ting do wn the ramp­down time. Upon expiration of the time, the measurement result upon completion
of the test is display ed, and the instrument change s to the PASS state. In the

PASS state, is lit.

10

Flow of PASS determination

W → I

Test voltage

77

5.4 Displaying the Test Result

Initial

voltage for

ramp-up

START

READY

Ramp-up

time

TEST

flashes

Set test time

TEST

DANGER is lit

Ramp-down

time

0.03 kV AC

flashes

(Undetermined

Time to

increase

the voltage

TEST

Set delay time

period)

Set test time

TEST

DANGER is lit

Discharge

time

60 V DC

5

Time

PASS

I → W

Test voltage

Initial

voltage for

ramp-up

READY

the voltage

START

Set delay time
(Undetermined

period)

Time to

increase

TEST

flashes

Set test time

TEST

DANGER is lit

Discharge

time

60 V DC

TEST

flashes

Ramp-up

time

Set test time

TEST PASS

DANGER is lit

Ramp-down

time

PASS

8
9

0.03 kV AC

Time

11

付録

索引

78

5.4 Displaying the Test Result

5.4.2 "FAIL" Determination

Test is unsucc ess ful wh en lights up. Similar to the wi thstand-voltage test
or insulation-resistance test FAIL state.

Withstand-voltage test : "3.4.2 "FAIL" Determination" (p. 46)
Insulation-resistance test : "4.4.2 "FAIL" Determination" (p. 63)

• When a current 1.5 times higher than the upper-limit test value is flowing while
performing a withstand-voltage test, the voltage is immediately blocked by the
insulation cir cuit, result ing i n an U PPER FAIL. In such cases, the c urrent value
is not displayed, and “- - - “ will appear.

• When the optional "Insulation-Resistance Measurement Range" function is
set to "1: Auto Range", it takes up to 1 .5 s to display the resi stance value.
When the insulation-r esistance test finishes before the preset test time, test

may end in .

• When a fixed range is set, “O.F.” will show when the value is beyond the
range’s measurements and “U.F.” will show when the value is lower than the
measurement range.

6.1 Functions for carrying out the tests safely

Useful Functions Chapter 6

6.1 Functions for carrying out the tests safely

6.1.1 Key-loc k Function

It inactivates all keys except the START key and STOP key.
The KEYLOCK lamp is li t whil e the key -lock funct ion is a ctive. Us e thi s functi on
when you do not want to change the test mode or test settings.

Even when the key-lock function is activated, the START and STOP keys on the
remote control box and the signals on the external I/O terminal remain active.

79

Key-lock

LOCK

To switch to the KEY-LOCK state, press the LOCK key.

All keys except the

Canceling the key-lock

SHIFT

+

LOCK

To cancel the key-lock, press the LOCK key while holding down the

SHIFT key.

6

START key and STOP key are disabled.

80

6.1 Functions for carrying out the tests safely

6.1.2 Momentary Out

See "Appendix2 List of Optional Functions" (p. A5)

The momentary out functi on allows the test only while the START key is held
down. Releasing the START key is equivalent to pr essing the STOP key and
ends the test.
To perform PASS/FAIL screening, hold down the START key until the preset test
time elapses. During the "6.3 Evaluate even for forced ter mination of test" (p.

88) setting, evaluation will take place when the START key is released.

The START key on the remote control box or the START s ignal via ex ternal I/O
has the same effect.

1.

2.

3.

4.

( is lit)

SHIFT

+

STOP

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

Press the key to move the flashing curs or to the posit ion of momentary

out

.

Press the / keys to select the mode.

5.

or

SHIFT

+

STOP

<Ex.> Momentary out is set to ON.

0: Momentary out is OFF (Initial setting)
1: Momentary out is ON

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

There is a priority hierarchy for the START keys.

Priority hierarchy: Remote Control Box > EXT I/O > Front panel of the 3174
(3174-01)

6.1.3 Double Action

See "Appendix2 List of Optional Functions" (p. A5)

Functions to prevent mishandling and to carry out the tests safely.
The test starts if the START key is pressed wi thin approximately 0.5 s of the

STOP key b ei n g pre s se d. N o rm al ly , pr es si ng t h e START key only starts the test.

However, when using the double action function, the STOP key must b e p re ssed
before pressing the START key. This function in creases testing sa fety by pre­venting operational errors.

only lights up for approximately 0.5 seconds after the STOP key is

pressed.

1.

( is lit)

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

81

6.1 Functions for carrying out the tests safely

2.

3.

4.

SHIFT

+

STOP

or

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

6

Press the key to move the flashing cursor to the position of double
action.

Press the / keys to select the mode.

<Ex.> Double action is set to ON.

0: Double action is OFF
1: Double action is ON (Initial setting)

5.

SHIFT

+

STOP

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

• The double action function can be set in co mbinatio n with the momentary out
function. If settings are made in this way, press the START key within 0.5 sec-
onds after the STOP key is pressed to start a test. Hold down the START ke y
during the test.

• When STOP hold and Doubl e Action a re set simulta neously, the display dur­ing STOP hold will be the same as the display fo r Double Action. F irst, pres s
the STOP key once to release hol d, then start using the D ouble Action fu nc­tion.

82

6.1 Functions for carrying out the tests safely

6.1.4 START Protection

See "Appendix2 List of Optional Functions" (p. A5)

This is a function for prev entin g the i nstrumen t from startin g the n ext tes t dur ing
discharge time upon completion of each withstand-voltage or insulation-resis­tance test.

1.

2.

( is lit)

SHIFT

+

STOP

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

3.

4.

5.

6.

or

SHIFT

+

Press the key to move the flashing cursor to the position of page, and
then press the

Press the key to move the flashing cursor to the position of START
protection.

Press the / keys to select the mode.

0: START protection is OFF
1: START protection is ON (Initial setting)

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

/ keys to display the optional screen (page 2).

<Ex.> START protection is set to OFF.

STOP

To continue to the setting for the next item, press the key.

• If the START protection function is used for tests that are to be performed suc­cessively, such as tests in auto-test mode, the instrument does not proceed to
the next test until completion of discharge, as the discharging function is
enabled upon term ination of each tes t (in the meantime, no key operation is
accepted).

• Note that if "0: OFF" is sel ec ted, ev en wh en the i ns tr ume nt i s in REA D Y state
upon completion of the test, residu al electricity may remai n between the out­put terminals.

• During automatic test mode, p rotection k icks in and START for electricity dis­charge will not be accepted.

6.1 Functions for carrying out the tests safely

6.1.5 Output-V oltage Restricting

See "Appendix2 List of Optional Functions" (p. A5)

Enable this function to set the upper-limit for the voltage to be output by this
instrument.
Set the value in the range o f 0.2 kV to 5.0 kV (in 0.1-kV steps , effective v alue).
Only available for withstanding test.
When the factory default is set to 5.0 kV.

83

1.

2.

3.

4.

( is lit)

SHIFT

+

STOP

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

Press the key to move the flashing cursor to the position of output­voltage restricting.

Press the / keys to select the mode.

6

5.

or

SHIFT

+

STOP

<Ex.> Set to 3 kV.

Setting range: 0.2 to 5.0 kV (The value changes by 0.1 kV.)
(Initial setting: 5.0 kV)

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

• If the set test voltage is greater than the vo ltage value set here, an err or will
occur upon startup of the test (the test-voltage value flashes), and it will not be
possible to conduct the test.

• If the test-voltage value that is load ed by loading a set value is g reater than
the set upper-limit, an error will occur upon startup of the test (the test-voltage
value flashes), and it will not be possible to conduct the test.

84

6.2 Display Hold (Hold Function)

6.2 Display Hold (Hold Function)

There are 3 types of fu nctions, PASS Hold, FA IL hold, STOP hold, to hol d the
display.

Distinction between the PASS Hold, FAIL Hold, and STOP Hold

READY

Press the START key to start a test.

TEST

Press the STOP key to abort a test.

Determination at

forced termination

ON

Determination

FAIL

(withstand-voltage mode)

Determination （Insulation-resistance

FAIL

FAIL termination mode）

If the test-voltage deviates from the set
value.

Determination （Insulation-

PASS

resistance PASS termination mode）

Test time elapses.

Determination （Insulation-

FAIL

resistance timer termination mode）

Determination （Insulation-

PASS

resistance timer termination mode）

Determination

PASS

(withstand-voltage mode)

OFF

FAIL Determination

PASS Determination

STOP Hold

function

ON

OFF

OFF

READY

OFF

PASS Hold FAIL Hold

ON

Press the STOP key to inactivate the hold function.

ON

• If the test time is set to OFF in withstand-voltage mode, PASS screening is not
performed. In such a case , FAIL screening is performed or the test is termi­nated using the STOP key.

• In insulation-resistance mode, if the test time is set to OFF, PASS screening is
not performed. In such a case, the test is terminated using the STOP key.

• Even when the test time is set t o OFF dur ing t he withstandi ng and i nsulati on­resistance tests, setting the instrum ent to the "6.3 Evaluate even for force d
termination of test " (p. 88 ) setting and press ing the STOP key will enable the
instrument to evaluate PASS or FAIL at the end of the test.
(A FAIL evaluation for the withstand-voltage test is acquired when FAIL is
shown.)

6.2.1 PASS Hold

See "Appendix2 List of Optional Functions" (p. A5)

Retains the value shown when the test has ended and PASS is dis played. To
return to the READY state, press the STOP key, which will cancel the Hold.
When the PASS hold function is disabled, the test result is displayed for 0.3 sec­onds, and the instrument reverts to the READY state.

85

6.2 Display Hold (Hold Function)

1.

2.

3.

( is lit)

SHIFT

+

STOP

or

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

6

Press the / keys to select the setting PASS hold.

<Ex.> Select PASS hold.

0: PASS hold is not used (Initial setting)
1: PASS hold is used

4.

SHIFT

+

STOP

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

86

6.2 Display Hold (Hold Function)

6.2.2 FAIL Hold

See "Appendix2 List of Optional Functions" (p. A5)

Retains the value shown when the test has ended and FAIL is displayed. To
return to the READY state, press the STOP key, which will cancel the Hold.
When the FAIL hold fu nction is disabled, t he test result is displayed for 0.3 se c­onds, and the instrument reverts to the READY state.

See "6.5 Limiting the FAIL Hold Cancellation (FAIL mode)" (p. 90)

1.

2.

3.

4.

( is lit)

SHIFT

+

STOP

or

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

Press the key to move the flashing curs or to the position of FAIL hold.

Press the / keys to select the mode.

5.

SHIFT

+

STOP

<Ex.> Select Without FAIL hold.

0: FAIL hold is not used
1: FAIL hold is used (Initial setting)

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

6.2.3 STOP Hold

See "Appendix2 List of Optional Functions" (p. A5)

Retains the value w hen the test has been forcibly terminate d by pressing the

STOP key during the test. To return to the R EADY state, press the STOP key,

which will cancel the Hold.
If the Hold function is not s elected, the instrum ent switc hes to th e READY state
upon forced termination of the test.
When the "Evaluate even for forced termination of test" is set for the optional
function, this setting will be ignored.

87

6.2 Display Hold (Hold Function)

1.

2.

3.

4.

( is lit)

SHIFT

+

STOP

or

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

6

Press the key to move the flashing cursor to the position of STOP hold.

Press the / keys to select the mode.

5.

SHIFT

+

STOP

<Ex.> Select STOP hold.

0: STOP hold is not used (Initial setting)
1: STOP hold is used

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

88

6.3 Evaluate even for forced termination of test

6.3 Evaluate even for forced termination o f test

See "Appendix2 List of Optional Functions" (p. A5)

Under normal circumstances, the test result will not be shown when the test
is forcibly terminated. However, setting this function will allow for the test
result to be shown even when the test has been forcibly terminated.

1.

2.

( is lit)

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the key to move the flashing cursor to the position of page, and
then press the / keys to display the optional screen (page 2).

3.

4.

5.

or

SHIFT

+

Press the key to move the flashing cursor to the position of judgment
when test has been forcibly terminated.

Press the / keys to select the mode.

<Ex.> Select ON for evaluation in a forced termination.

0: evaluation in a forced termination OFF

(No evaluation during a forced termination) (Initial setting)

1: evaluation in a forced termination ON

(

Evaluate even during forced termination)

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

STOP

To continue to the setting for the next item, press the key.

• In order to carry out evaluation whe n the tim er PASS/FAIL and all tests hav e
completed, the STOP hold setting is not valid.

• An / result will ap pea r und er the fo llo win g f or ce d te rm i­nations

(1) When the average measuremen t value, etc. is not comp letely proces sed immediat e-

ly after the start of a test, etc.
(2) When test abnormalities occur due to voltage instabilities
(3) When the measu rement current d oes not exceed the upper-limit during ramp-up and

ramp-down in a withstanding test
(4) When the range c an not be det erm ine d b y a uto -rang e i n th e d ela y d uri ng t he insula-

tion-resistance measurement.

• Evaluation will not be carried out in fo rced terminations note d in "Chapter 5
Automatic Test".

89

6.4 Continue testing even after FAIL result is shown (Continuous Test Mode, Only Withstanding-

6.4 Continue testing even after FAIL result is

1.

2.

shown

( is lit)

SHIFT

+

(Continuous Test Mode, Only Withstanding-Test)

See "Appendix2 List of Optional Functions" (p. A5)

Set the instru ment to continue or disc ontinue the test when a NG test result is
shown.

Under this function, the test wi ll continu e with lightin g up next to UPP ER
or LOWER until the test time has run out, except for under the following condi­tions. When the test is con tinued under an NG result, the instrum ent will buzz
and stop the test under the following conditions.
(1) When a current highe r than about 24 mA (20 mA -range) or about 1 2 mA (10

mA-range) is detected in a withstanding test (UPPER FAIL).

(2) When broken wir e or poor conn ection is detec ted in Contact Chec k function

(Err message)

See"3.1.7" "4.1.5 Setting th e Confirma tion Voltage used for upper and lower-limit s for

Contact Check"

When FAIL hold is set, the test will hold when the test time has run out.

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

6

3.

4.

5.

STOP

or

Press the key to move the flashi ng cursor to the position of page, and
then press the

Press the key to move the flashing cursor to the position of Continu­ous Test Mode.

Press the / keys to select the mode.

/ keys to display the optional screen (page 2).

<Ex.> Select Continuous Test ON mode.

0: Continuous Test Mode OFF

(Test completes when an NG result is shown) (Initial setting)

1: Continuous Test Mode ON

(

Continue testing even when NG result is shown)

90

6.5 Limiting the FAIL Hold Cancellation (FAIL mode)

6.

SHIFT

+

STOP

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

When carrying out continuous test mode settin g, the maximum cur rent detected
and the timer will be displayed at the end of the test. Sometimes a current higher
than the maximum cu rrent displayed during testi ng may be displayed beca use
the display may not capture the fluctuations in current quick enough.

6.5 Limiting the F AIL Hold Cancellation (FAIL mode)

See "Appendix2 List of Optional Functions" (p. A5)

FAIL mode is a function enabli ng users to cancel the FAIL hold status only with
the STOP key on the main instrument.

1.

2.

( is lit)

SHIFT

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

3.

4.

+

STOP

or

Press the key to move the flashing cursor to the position of FAIL
mode.

Press the / keys to select the mode.

<Ex.> FAIL mode is set to ON.

0: FAIL mode is OFF

Cancellation of FAIL hold status is possible with all STOP functions) (Ini-

(
tial setting)

1: FAIL mode is ON (Cancellation of FAIL hold status is only possible with

STOP key on the main instrument.)

5.

SHIFT

+

STOP

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

To continue to the setting for the next item, press the key.

6.6 Changing the Output Voltage during the withstanding test

6.6 Changing the Output Voltage during the
withstanding test

The output voltage ca n be changed and the withstandi ng condition can be con­firmed during the withstanding test.

• To prevent electric shock, never touch the tested object or test lead.

• When changing the output voltage from RS-232C or GP-IB, it is difficult
to grasp the timing of vo ltage changes as the voltage chang es automa ti­cally. As electric shock accidents can happen easily, take measures to
prevent people from coming near the instrument or the tested object
when changing the output voltage automatically.

• When the tested objec t in use shows dependen cy on voltage (impedance of
ceramic condenser, etc.), the wavefo rms of the output v oltage may become
distorted. The tested object may malfunction depending on the distortion of the
waveforms.

• When the tested object in use possesses an induc tivity like a coil, a voltage
higher than the pre-se t voltage may appear transitionally, causing damage in
the tested object.

• The tested object may damag e if a v oltage hig her than nec es sa r y is s uppl ie d.

Be careful when setting the output voltage to ensure that the tested object
does not receive a voltage higher than necessary.

• A contact error will occur w hen the output voltage is changed during th e test

and the contact check upper-limit voltage and lower-limit voltage are
exceeded.

91

6

When changing the voltage using the panel key

1. See "9.5 Interface Command "START"" (p. 186),

Effecting the output voltage change

2. S tar t the tes t.

3. Move on to the next key, tak ing care not to touch the tested o bject and test

lead during the test.
To increase the test voltage:

ON/OFF +

SHIFT + .....................Increasing the voltage by 100 V each

To decrease the test voltage:

ON/OFF +

SHIFT + .....................Decreasing the voltage by 100 V each

Note: Test voltage changed during output will not be saved

..................Increasing the voltage by 10 V each

..................Decreasing the voltage by 10 V each

To change the voltage in RS-232C and GP-IB

1. See "9.5 Interface Command "START"" (p. 186),

Effecting the output voltage change

2. S tar t the tes t.

3.

Send voltage setting command from RS-232C and GP-IB du ring testing

”:CONFigure:WITHstand:VOLTage voltage value (0.20kV to 5.00 kV)”

Note: Test voltage changed during output will not be saved

92

6.7 Insulation-Resistance Test Termination Mode

6.7 Insulation-Resistance Test Termination
Mode

See "Appendix2 List of Optional Functions" (p. A5)

When performing an i nsulatio n-re sistanc e test, set whet her yo u want to con duct
the test for the set test time rega rdless of the decision , terminate the test when
PASS screening is p e rfor me d, o r termi nat e th e test when FAIL screening is pe r­formed. (Insulation-resistance mode only.)

0: Test for set time (Timer Ended status mode) (Ini tial setting)

The test is only conducted for the set time, and the value is decided when the
test is terminated.

with no evaluati on.

1: Terminate test at PASS screening (PASS Ended status mode)

The test is terminated when PASS screening is conducted within the set time.
If PASS screening is not conducted within the set time, the test is terminated
when FAIL screening is conducted after the set time.

er is OFF, the tests will continue with no evaluation.

When the test time timer is OFF, the tests w ill continue

When the test time tim-

1.

2.

3.

( is lit)

SHIFT

+

STOP

2: Terminate test at FAIL screening (FAIL Ended status mode)

The test is terminated when FAIL screening is conducted within the set time
(excluding delay time). If FAIL screening is not conducted within the set time,
the test is terminated when PASS screening is conducted after the set time.

When the test ti me timer is OFF, the tests will continu e wit h no ev aluati on.

“6.4 Continuous Test Mode” setting will be ignored.

Make sure the lamp is lit on the screen.

* will not be displayed during the Double Action setting.

Press the STOP key while holding down the SHIFT key to display the
optional screen (page 1).

Press the key to move the flashing cursor to the position of page, and
then press the

/ keys to display the optional screen (page 2).

or

93

6.7 Insulation-Resistance Test Termination Mode

4.

5.

6.

or

SHIFT

+

STOP

Press the key to move the flashing cur sor to the posi tion of insul ation­resistance test termination mode.

Press the / keys to select the mode.

<Ex.> Select “Terminate test at FAIL screening”.

0: Test for set time (Initial setting)
1: Terminate test at PASS screening
2: Terminate test at FAIL screening

Press the STOP key while holding down the SHIFT key to complete the
setting value.

The instrument reverts to the READY state.

6

To continue to the setting for the next item, press the key.

• Any of the following settings is useful during a test on a tested object with
capacity properties.

(1) "0: Test for set time"
(2) "1: Terminate test at PASS scree ning", and set the delay time necess ary

for charging.

(3) "2: Terminate test at FAIL screening", and set the delay time necessary for

charging.

• When the test time is set to OFF, the setting of this mode is invalid. Press t he

STOP key to terminate the test.

94

6.7 Insulation-Resistance Test Termination Mode

"0: Test for set time"

Test vol t ag e

Set delay time

(Undetermined

period)

Time to

increase the

voltage

START

READY

TEST

flashes

Set test time

TEST

DANGER is lit

Discharge

time

60 V DC

Time

PASS

/FAIL

"1: Terminate test at PASS screening"

Test voltage

READY

increase the

START

Set delay time

(Undetermined

period)

Time to
voltage

TEST

flashes

DANGER is lit

Discharge

time

PASS

※

60 V DC

READY

"2: Terminate test at FAIL screening"

Test voltage

Set delay time

(Undetermined

period)

Time to

increase the

voltage

Discharge

time

Test stops when PASS

evaluation is atta in ed

Set test time

Test stops when FAIL

evaluation is attained

Set test time

※

TEST

Time

START

READY FAIL

TEST

flashes

DANGER is lit

※

60 V DC

TEST※

Time

READY