IET 1863 Guida alla risoluzione dei problemi

♦PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT ♦

Email: inf[email protected]

TEL: (516) 334-5959 • FAX: (516) 334-5988

www.ietlabs.com

IET LABS, INC.

1863 and 1864

Megohmmeters

User and Service Manual

Visit www.ietlabs.com for manual revision updates

1863-1864 im/Aug 2018

♦PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT ♦

Email: inf[email protected]

TEL: (516) 334-5959 • FAX: (516) 334-5988

www.ietlabs.com

IET LABS, INC.

Revision History:

Date Description By

7/28/10 • Corrected Errors

• Automatic TOC created

5/25/11 • Corrected input/output identiﬁcation error

on Page 4

• Voltage range on page 4 was 200-230

• Added fuse specs on

Aug 2018 • Major update for standardization of

marking and required information in the

manual

WARRANTY

We warrant that this product is free from defects in material and workmanship and, when properly used,

will perform in accordance with applicable IET speciﬁcations. If within one year after original shipment,

it is found not to meet this standard, it will be repaired or, at the option of IET, replaced at no charge when

returned to IET. Changes in this product not approved by IET or application of voltages or currents greater

than those allowed by the speciﬁcations shall void this warranty. IET shall not be liable for any indirect,

special, or consequential damages, even if notice has been given to the possibility of such damages.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED,

INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR

FITNESS FOR ANY PARTICULAR PURPOSE.

WARNING

OBSERVE ALL SAFETY RULES

WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES.

Dangerous voltages may be present inside this instrument. Do not open the case

Refer servicing to qualiﬁed personnel

HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT

WHENEVER HAZARDOUS VOLTAGES (> 45 V) ARE USED, TAKE ALL MEASURES TO

AVOID ACCIDENTAL CONTACT WITH ANY LIVE COMPONENTS.

USE MAXIMUM INSULATION AND MINIMIZE THE USE OF BARE

CONDUCTORS WHEN USING THIS INSTRUMENT.

Use extreme caution when working with bare conductors or bus bars.

WHEN WORKING WITH HIGH VOLTAGES, POST WARNING SIGNS AND

KEEP UNREQUIRED PERSONNEL SAFELY AWAY.

CAUTION

DO NOT APPLY ANY VOLTAGES OR CURRENTS TO THE TERMINALS OF THIS

INSTRUMENT IN EXCESS OF THE MAXIMUM LIMITS INDICATED ON

THE FRONT PANEL OR THE OPERATING GUIDE LABEL.

1863 and 1864 Meghommeters

iCONTENTS, FIGURES, AND TABLES

Contents

Condensed Operating Instructions..........................................................v

Safety Summary.........................................................................................vi

Safety Symbols ..........................................................................................viiI

Speciﬁcations.............................................................................................x

Chapter 1: INTRODUCTION.......................................................................1

1.1 Description............................................................................................................... 1

1.2 Opening and Tilting the Cabinet .............................................................................. 1

1.3 Controls, Connectors and Indicators........................................................................ 1

1.4 Preﬁxes..................................................................................................................... 6

1.5 Connections.............................................................................................................. 6

Chapter 2: INSTALLATION.........................................................................7

2.1 Initial Inspection ...................................................................................................... 7

2.2 Dimensions .............................................................................................................. 7

2.3 Repackaging for Shipment....................................................................................... 7

2.4 Storage ..................................................................................................................... 8

2.5 Bench Setup ............................................................................................................. 8

2.6 Rack Mounting......................................................................................................... 8

2.7 Power Connections .................................................................................................. 8

Chapter 3: OPERATION .............................................................................9

Shock Hazard ................................................................................................................ 9

3.1 Operating Guide ..................................................................................................... 10

3.1.1 Ground-Link Connection............................................................................... 10

3.1.2 Test Voltage Selection.................................................................................... 10

3.1.3 Initial adjustments.......................................................................................... 10

3.1.4 Connection of Unknown................................................................................ 10

3.1.5 Measurement Procedure ................................................................................ 11

3.1.5.1 Measuring an Unknown Value ............................................................ 11

3.1.5.2 Measuring a Known Value .................................................................. 11

3.2 Output for Remote Indication .................................................................................. 12

1863 and 1864 Meghommeters

ii CONTENTS, FIGURES, AND TABLES

Chapter 4: APPLICATIONS........................................................................13

4.1 Insulation Testing..................................................................................................... 13

4.2 Test Sample Resistivity Measurements.................................................................... 13

4.3 Capacitor Insulation Resistance.............................................................................. 14

4.3.1 General........................................................................................................... 14

4.3.2 Charging Time Constant ................................................................................ 14

4.3.4 Discharge Time.............................................................................................. 15

4.3.5 Large Capacitors, Very High Resistance ....................................................... 15

4.4 Resistance Measurements ........................................................................................ 16

4.5 Measurement of Voltage Coefﬁcient........................................................................ 16

4.6 Guarded 3-Terminal Measurements......................................................................... 16

4.7 Remote Shielded Measurements.............................................................................. 17

4.8 Measurements Under Humid Conditions................................................................. 17

Chapter 5: THEORY....................................................................................19

5.1 Theory Overview .................................................................................................... 19

5.2 Circuit Description................................................................................................... 19

5.2.1 Type 1863 Megohmmeter .............................................................................. 19

5.2.2 Type 1864 Megohmmeter .............................................................................. 20

Chapter 6: Service And Maintenance.......................................................21

6.1 Service...................................................................................................................... 21

6.3 Cabinet Removal...................................................................................................... 23

6.4 Troubleshooting ....................................................................................................... 23

6.5 Calibration................................................................................................................24

6.5.1 Meter Tracking............................................................................................... 24

6.5.2 Voltage Accuracy ........................................................................................... 24

6.5.3 Range-Resistor Accuracy............................................................................... 25

6.5.4 Coarse Adjustment .................................................................................... 25

6.6 Knob Removal ......................................................................................................... 25

6.7 Knob Installation...................................................................................................... 26

6.8 Meter Cover Care..................................................................................................... 27

Chapter 7: PARTS LISTS AND DIAGRAMS ..............................................29

1863 and 1864 Meghommeters

iiiCONTENTS, FIGURES, AND TABLES

Figures

Figure 1-1. Type 1864 Front-Panel View ......................................................iv

Figure 1-2. Type 1863 Front-panel Controls, Connectors and Indicators.....2

Figure 1-3. Type 1864 rear-panel controls and connectors.........................4

Figure 1-4. Methods of connection to the measurement terminals..............5

Figure 2-1. Dimensions of the GR/IET 1863 Megohmmeters ......................7

Figure 3-1 Connection to GUARD and +UNKNOWN terminals...................10

Figure 4-1. Electrode arrangement for resisitivity measurements...............14

Figure 4-2 Basic megohmmeter circuit ........................................................15

Figure 4-3. Guarded measurement of a three-terminal resistor...................16

Figure 5-1 Megohmmeter block diagram .....................................................20

Figure 6-1. Connections for measuring standard resistors ..........................22

Figure 6-2. Top interior view of 1863 Megohmmeter....................................25

Figure 6-3. Bottom interior view of 1863 Megohmmeter ..............................25

Figure 6-4. Top interior view of 1864 Megohmmeter...................................26

Figure 6-5. Bottom interior view of 1864 Megohmmeter ..............................26

Figure 7-1. Replaceable mechanical parts on the 1863...............................32

Figure 7-2. Replaceable mechanical parts on the 1864...............................33

Figure 7-3. Type 1863 switching diagram....................................................34

Figure 7-4. Regulator and ampliﬁer circuits etched-board assembly ...........35

Figure 7-5. Type 1863 rectiﬁer circuit etched-board assembly....................35

Figure 7-6. Type 1863 schematic diagram ...................................................36

Figure 7-7. Type 1864 switching diagram.....................................................37

Figure 7-8. Type 1864 rectiﬁer circuit etched-board assembly.....................38

Figure 7-9. Type 1864 schematic diagram ...................................................39

Figure 7-10. Complete cabinet assembly.....................................................40

1863 and 1864 Meghommeters

Figure 1-1. Type 1864 Front-Panel View

NOTE: The 1863 front panel is similar.

See Figure 1-2.

SET ∞

HIGHEST RANGE SET ∞GUARD + UNKNOWN -

GROUND

MULTIPLIER

DIAL

FUNCTION

SWITCH

TEST-VOLTAGE

DIAL

POWER-OFF

SWITCH

METER

1863 and 1864 Meghommeters

Condensed Operating Instructions

In order to measure an unknown resistor (as a sample

test):

1. Set that the function switch is set to the

DISCHARGE position.

2. Turn the unit On.

3. Verify that the DANGER light is not lit.

Note: The DANGER light is triggered

by a voltage-sensing circuit within the

Megohmmeter. It is independent of the

switch setting.

4. Connect the shorting link between the

GROUND terminal and the GUARD.

(For additional information, see section

3.1.1)

5. Set test-voltage dial the lowest possible volt-

age setting and increase later if necessary.

6. For 1863 set the Multiplier dial to 1 M.

For 1864 set Multiplier dial to 100 k.

7. Adjust the SET ∞control knob to ∞reading

on the meter.

For additional information, see section

3.1.3.

8. Connect the unknown resistor to the

UNKNOWN terminals.

9. Set the function switch to the CHARGE

position and pause for a few seconds.

If the sample has a large capacitance,

charging time has to be increased

accordingly.

10. Set the function switch to the MEASURE

position and wait for the reading to stabilize.

11. If the meter reading is above 5.0, adjust

the Multiplier dial, increasing the indicated

resistance range until an on-scale reading is

obtained.

If the meter reading is below 0.5, the

resistance is too low to be measured by

the Megohmmeter.

Value = Meter reading * Range multiplier

12. Set the function switch to DISCHARGE and

wait a few seconds.

13. Disconnect the resistor from the UNKNOWN

terminals.

DANGER

The energy stored in a capacitor connected to the terminals

may be LETHAL. Always set the function switch to DIS-

CHARGE before you connect or disconnect the unknown.

Otherwise the terminals of the Megohmmeter, cables and

unknown should be considered under high voltage of up

to 1090 Vdc.

1863 and 1864 Meghommeters

SAFETY SUMMARY

The following general safety precautions must be observed during all phases of operation, service,

and repair of this instrument. Failure to comply with these precautions or with speciﬁc WARNINGS

elsewhere in this manual may impair the protection provided by the equipment. Such noncompliance

would also violate safety standards of design, manufacture, and intended use of the instrument.

IET Labs assumes no liability for the customer’s failure to comply with these precautions.

The 1863 and 1864 Megohmmeters comply with INSTALLATION CATEGORY I as well as

POLLUTION DEGREE 2 as deﬁned in IEC61010-1.

Voltages of up to 1090 Vdc maybe present at measurement terminals of the 1864 Megohmmeter and

voltages of up to 500 Vdc on the measurement terminals of the 1863 Megohmmeter.

If an instrument is marked CAT I (IEC Measurement Category I), or it is not marked with a

measurement category, its measurement terminals must not be connected to line-voltage mains and

it is not designed for use as for measurements within measurement categories II, III and IV,

The 1863 and 1864 Megohmmeters are an indoor use product.

DANGEROUS PROCEDURE WARNINGS

Comply with all WARNINGS - Procedures throughout in this manual prevent you from potential

hazard. These instructions contained in the warnings must be followed.

BEFORE APPLYING POWER

Verify that all safety precautions are taken. Make all connections to the instrument before applying

power. Note the instrument’s external markings described under “Safety Symbols”.

GROUND THE INSTRUMENT

This is a Safety Class I instrument. To minimize shock hazard, the instrument chassis and cabinet

must be connected to an electrical ground. The power terminal and the power cable must meet

International Electrotechnical Commission (IEC) safety standards.

Questo manuale è adatto per i seguenti modelli

Indice

Altri manuali iET Strumento di misura

iET

iET 1316 Guida alla risoluzione dei problemi

iET

iET DE-6000 Guida alla risoluzione dei problemi

iET

iET PRS-300 Series Manuale utente

iET

iET LOM-4000 Guida alla risoluzione dei problemi

Manuali Strumento di misura popolari di altre marche

Suaoki

Suaoki D40 Manuale utente

Elster

Elster BK-G1.6 Manuale utente

Endress+Hauser

Endress+Hauser Deltabar FMD71 Manuale

Duratool

Duratool D03128 Manuale utente

Vega

Vega VEGAPULS 65 Manuale utente

Tonghui

Tonghui TH2618B Manuale utente

Tenmars

Tenmars TM-801 Manuale utente

MSR

MSR 145 Manuale utente

TPS

TPS WP-82 Manuale utente

ELMETRON

ELMETRON CP-511 Manuale utente

PCB Piezotronics

PCB Piezotronics 003C30 Manuale utente

Tenma

Tenma 72-10465 Manuale utente

Endress+Hauser

Endress+Hauser Proline Promag 50 Specifiche tecniche

Siemens

Siemens SITRANS F Coriolis FCT030 Manuale elenco delle parti

KLINGER

KLINGER CMF V Series Manuale utente

EXFO

EXFO FTB-2 Manuale operativo e di manutenzione

Keysight

Keysight M8290A Manuale utente

ADTEK

ADTEK MW-5 Manuale utente

iET 1863 Guida alla risoluzione dei problemi

Manuali Strumento di misura popolari di altre marche