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OPERATING PRINCIPLE

TOS8870A

Chapter 4

OPERATING PRINCIPLE

This Chapter describes operating principle of the tester, used the block diagram.

4.1 Block Diagram

Fig.4-1

TOS8870A Block Diagram

HIGH VOLTAGE
PRESTABILIZATION
CIRCUIT

HIGH VOLATAGE
STABILIZATION
CIRCUIT

WINDOW

COMPARATOR

CONTROL

CIRCUIT

FAIL ALARM

START

STOP

PROTECTION

CIRCUIT

HIGH LIMIT
REFERENCE VALUE
SETTING CIRCUIT

LOW LIMIT
REFERENCE
VALUE
SETTING
CIRCUIT

CURRENT
DETECTOR
CIRCUIT WITH
LOG CONVERTER

[1]

[2]

[4]

[3]

[5]

[6]

[7]

[8]

Ω

POWER

SOURCE

RELAY

VOLTAGE

REGULATOR

HIGH VOLTAGE

TRANSFORMER

AC LINE

[9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

WINDOW

COMPARATOR

CURRENT

DETECTOR

OUTPUT

TERMINAL

INSULATION RESISTANCE TESTER

WITHSTANDING VOLTAGE TESTER

DISCHARGE

CIRCUIT

Summary of Contents for TOS8870A

Page 1: ...RESISTANCE TESTER OPERATION MANUAL DANGER This Tester generates high voltage Any incorrect handling may cause death Read Chapter 2 WARNINGS AND CAUTIONS FOR OPERATING THE TESTER in this manual to prev...

Page 2: ...ets lost or soiled a new copy can be provided for a fee In either case please contact Kikusui distributor agent and provide the Kikusui Part No given on the cover This manual has been prepared with th...

Page 3: ...eath by electric shock the output terminal the test lead wire connected to the output terminal the Device Under Test DUT any part of the Tester which is electrically connected to the output terminal a...

Page 4: ...haracteristics suitable for this product The use of a fuse with a different rating or one that short circuits the fuse holder may result in fire electric shock or irreparable damage AC power cord The...

Page 5: ...me or consumer use Purposes of use Do not use the product for purposes other than those described in the operation manual Input power Use the product with the specified input power voltage For applyin...

Page 6: ...l be included when the product is relocated Operation Check that the AC input voltage setting and the fuse rating are satisfied and that there is no abnormality on the surface of the AC power cord Be...

Page 7: ...IN JAPAN WARNING TO AVOID ELECTRIC SHOCK THE POWER CORD PROTECTIVE GROUNDING CONDUCTOR OR THE PROTECTIVE CONDUCTOR TERMINAL MUST BE CONNECTED TO GROUND DO NOT REMOVE COVERS REFER SERVICING TO QUALIFI...

Page 8: ...ich if ignored may result in damage to the product and other property Shows that the act indicated is prohibited Is placed before the sign DANGER WARNING or CAU TION to emphasize these When this symbo...

Page 9: ...p plied from the fixed installation Examples of such equipment are appliances portable tools and other household and similar loads If such equipment is subjected to special requirements with regard to...

Page 10: ...rnings and Cautions when Operating the Tester 7 2 2 1 Connecting of test lead wire on LOW side 7 2 2 2 Connection of test lead wire on high voltage output side 7 2 2 3 Power switch 7 2 2 4 Change of t...

Page 11: ...ting the LOWER REFERENCE value 15 3 3 Single Insulation Resistance Test 17 1 Selecting the insulation resistance test mode 17 2 Check the Zero ohm 17 3 Selecting a test voltage 17 4 Setting the PASS F...

Page 12: ...n of Rear Panel Items 35 Chapter 6 MAINTENANCE AND CALIBRATION 6 1 Cleaning the Outer Surfaces 36 6 2 Inspection 36 6 3 Maintenance 36 6 4 Calibration 36 Chapter 7 SPECIFICATIONS 7 1 Withstanding Volt...

Page 13: ...reset on the front panel of the Tester but also when it is less than the low limit reference value which is continuously adjustable down to one half of the high limit reference value thereby contribut...

Page 14: ...able atmosphere To prevent explosion or fire do not use the unit near alcohol or thinner or in an atmosphere con taining such vapors Avoid locations where the unit is exposed to high temperature or di...

Page 15: ...ting in electrical shock or fire Do not use the unit in locations where highly sensitive measuring instru ments or receivers are nearby Such instruments may be affected by the noise generated by the u...

Page 16: ...s posted near the AC line power input terminal of the Tester If no particular indication is made on this indicator sheet the AC line setting of the Tester is for the standard nominal voltage 100 VAC A...

Page 17: ...panel 4 Plug in the AC power cord 1 6 Grounding Electric shock may occur if proper grounding is not furnished Connect the ground terminal to an electrical ground safety ground If you do not ground the...

Page 18: ...nded when the Tester output is shorted to an earth line or to a conveyor or other device which is connected to an earth line or when it is shorted to the AC line the Tester chassis can be charged up t...

Page 19: ...h 2 Confirm if the indicator of the output voltmeter is at 0 3 Confirm if the DANGER lamp has been off 4 Connect the high voltage test lead wire with the HIGH VOLTAGE terminal 5 Short the high voltage...

Page 20: ...d the high voltage areas test lead wire probe or output terminal for correction of the wiring or any other purpose provided that the following confirmation has been made the indication of output volta...

Page 21: ...nnect the DUT from the Tester during testing If it is disconnected check the two points above before touching high voltage areas 2 Consideration of discharge time The time required to discharge electr...

Page 22: ...t short circuit the Tester output with the ground or a conveyer or any device connected to the ground or with the commercial power line around Tester location Such a short circuit may cause high volta...

Page 23: ...ted at the CUTOFF CURRENT of 100 mA leave a sus pension time longer than the test duration Incidentally the maximum allowable test duration is 30 minutes at ambient temperature of 40 C or lower The ab...

Page 24: ...ART switch The conditions for illuminating of the lamp are given on 5 1 Descrip tion of Front Panel Items on page 31 Eliminate the conditions and then press the STOP switch to reset the Tester When th...

Page 25: ...page 19 5 Setting the test voltage 1 Set both TIMER ON OFF switch and LOWER ON OFF switch to the OFF state 2 Check that the PROTECTION lamp is not illuminating If the PROTECTION lamp is illuminating p...

Page 26: ...luminate to indicate that the test volt age is ready to be applied to the DUT 5 Gradually turn clockwise the TEST VOLTAGE dial until the necessary test voltage is obtained 6 When the required test tim...

Page 27: ...t is possible that the cur rent which flows through stray capacitances of the test leadwires and other DUT becomes larger than the low limit reference value and no low limit judgement for low leakage...

Page 28: ...e when the leakage current of the DUT is smaller than the minimum detectable current of the Tester or when the current which flows in the stray cappacitances of the test leadwires and other device tes...

Page 29: ...stances The window comparator system is especially advantageous when the distribution of the insu lation resistances of DUT can be predicted and the predicted high limit value is in the range of the d...

Page 30: ...of the time setup switch equals the timer setting When the range selector switch is pressed the timer setting equals the setting of the time setup switch multiplied by 0 1 The setting of the timer se...

Page 31: ...test If the Tester is in the RESET state the test will start as you press the START switch As you press the STOP switch the output voltage is cutoff and the test ends 9 Reapplication of test voltage r...

Page 32: ...to the DUT 7 Connect the high voltage test leadwire to the DUT 4 Test procedure 1 Set the Tester in the RESET state 2 Press the START switch 3 The Tester will automatically perform the two types of t...

Page 33: ...that the high test voltage is not generated inadvertently Also provide full measures to ensure that nobody is con tacted with the high voltage areas DUT test lead wire probe or output terminal etc whe...

Page 34: ...er A timing of STOP signal for clearing of FAIL alarm sends STOP signal more than 20 ms after doing 100 ms or more after FAIL signal generated as follows Fig 3 7 With a view to prevent erroneous opera...

Page 35: ...e interlock terminal is short circuited with a shorting piece to cancel the protection mode on a casual basis To perform a with standing voltage test you must use the interlock function to operate the...

Page 36: ...conditions are met Power of the Tester is turned on The STOP signal is not applied or the STOP switch is not pressed Not in the TEST ON state Not generating the PASS signal Not generating the FAIL al...

Page 37: ...en by this signal The minimum rating of the load applicable to the contact is 5 V 10 mA or higher Set V and R so that a load with higher rating is applicable Noise measures are also required in some c...

Page 38: ...you press the START switch the Tester is driven into the TEST ON state In this mode testing cannot be performed simply by pressing the START switch Testing will only start when the STOP switch is pres...

Page 39: ...perating the Tester in the MOMENTARY mode and using RC02 TOS Remote Control Box both hand type option in conjunction When test is made with the timer the Tester generates a PASS signal for approximate...

Page 40: ...CONTROL CIRCUIT FAIL ALARM START STOP PROTECTION CIRCUIT HIGH LIMIT REFERENCE VALUE SETTING CIRCUIT LOW LIMIT REFERENCE VALUE SETTING CIRCUIT CURRENT DETECTOR CIRCUIT WITH LOG CONVERTER 1 2 4 3 5 6 7...

Page 41: ...tisfy the specification accuracy 5 Ohmmeter This meter is driven by the above logarithmic signal to indicate the insulation resistance of the DUT 6 High limit reference value setting circuit Sets the...

Page 42: ...alue set with the LOWER REFERENCE value control When the leakage current is not within the above range the comparator generates a FAIL judgement 4 3 Zero Start Switch If a regular mechanical contact t...

Page 43: ...h is pressed the ohmmeter indicates the value of measuring resistance When the LOWER switch is pressed the ohmmeter indicates the low limit reference value for PASS FAIL judgment when UPPER switch is...

Page 44: ...leakage current is more than the high limit reference value The LOWER ON OFF switch enables or disables this function 10 LOWER REFERENCE The potentiometer is used to set the low limit reference value...

Page 45: ...illuminates When this has occurred remove the cause of the trip and then press the STOP switch to reset the Tester 1 When the RANGE 2 5kV 5kV switches of withstanding voltage tester are changed 2 Whe...

Page 46: ...lecting the timer range on page 13 19 TEST VOLTAGE The dial controls the output voltage for withstanding voltage test The output voltage increases as you turn this dial clockwise Be sure to set the di...

Page 47: ...milliammeter between them The milli amme ter should be capable of measuring the leakage current Be sure to connect the shorting bar when the current is not monitored A current may flow also when in in...

Page 48: ...cuited by using a circuit tester or other instrument If the test leadwire is damaged its sheath is damaged or its core wire is open cir cuit it can be a cause of electric shock hazards Never use imper...

Page 49: ...s cutoff and FAIL alarm is gen erated If no FAIL judgment is made after preset period has elapsed PASS signal is generated High limit reference value CUTOFF CURRENT 0 5 1 2 4 8 10 100 mA 7 values By c...

Page 50: ...asuring current 1 0 mA Short circuit current 12 mA or less Effective Measuring Ranges 500 V range 1 M to 1 000 M 1 000 V range 2 M to 2 000 M Values center of scale 500 V range 20 M 1 000 V range 50 M...

Page 51: ...and FAIL alarm Signal Name Conditions for Signal Generation Type of Signals TEST ON signal Delivered during entire test on period Make contact signal and lamp PASS signal Delivered when PASS judgment...

Page 52: ...Conforms to the requirements of the following directive and standard EMC Directive 89 336 EEC EN61326 EN61000 3 2 EN61000 3 3 Under following conditions 1 Used HV test leadwire TL01 TOS 2 No discharge...

Page 53: ...TOS8870A SPECIFICATIONS 41 7 4 Outline Drawing Unit mm Fig 7 1...

Page 54: ...time with your both hands thereby enhancing the operating safety Functions of switches OPERATE switch This switch enables when ON or disables when OFF the START switch or switches START switch The te...

Page 55: ...if you do this the DUT may be damaged If you disconnect the probe from the DUT while letting it deliver the test voltage the items of the tested circuit may remain charged up to the high test voltage...

Page 56: ...TOS8870A OPERATION MANUAL...

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