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AEMC 1000N Calibration Manual

Megohmmeter
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Rev. 8 3/04
MEGOHMMETER
MODEL 1000N
(CATALOG# 185.100)
REPAIR AND CALIBRATION MANUAL

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  • Page 1 Rev. 8 3/04 MEGOHMMETER MODEL 1000N (CATALOG# 185.100) REPAIR AND CALIBRATION MANUAL...

  • Page 2: Table Of Contents

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 TABLE OF CONTENTS Repair and Technical Services ..................3 Introduction........................4 Specific Features......................4 Principal Characteristics ....................4 Specifications ........................6 Operation........................7 Calibration ........................11 Taking the Instrument Apart ..................14 Troubleshooting......................
  • Page 3 To guarantee that your instrument complies with the factory specifications, we recommend that the unit be submitted to our factory service center at one year intervals for recalibration, or as required by other standards. For instrument repair and/or calibration, please call our factory at (800) 945-AEMC. ® CHAUVIN ARNOUX , Inc.

  • Page 4: Introduction

    REPAIR AND CALIBRATION MANUAL CAT. #185.100 INTRODUCTION The Model 1000N Megohmmeter is a portable instrument which is essentially intended for performing insulation tests upon various components of electrical systems and equipment. The instrument allows completion of measurements according to multiple voltage levels (step voltage method), making it possible for the user to evaluate insulation quality and to plan preventive maintenance accordingly (especially for motors).
  • Page 5 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 Continuity Testing: 0.1Ω to 100Ω (typical accuracy: ± 5% of reading, max: ± 10% of reading or 5 mΩ) The logarithmic scale is the same for the Ω and KΩ range. The 0.1Ω is calibrated at the output terminal of the instrument.

  • Page 6: Specifications

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 SPECIFICATIONS: VOLTAGE TESTS (SAFETY CHECK) ELECTRICAL VOLTAGE RANGE: 0 to 600 V DC ACCURACY: 3% of full scale INSULATION TESTS DC TEST VOLTAGE: 50, 100, 250, 500, 1000 V GENERAL SPECIFICATIONS MEGOHM RANGE:...

  • Page 7: Operation

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 OPERATION: a) Mode of Operation for MΩ and GΩ: An oscillator (Z1) provides a low voltage signal which is amplified by the transformer (T1) then rectified and filtered (CR201, C201). This high DC voltage is regulated through the divider (R202 to R209) and the operational amplifier (Z4).
  • Page 8 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 The beeper (BZ1) is power by the oscillator (Z8) and the transistor (Q3) every six seconds, except for when in the ohm range where the comparator (Z2) allows the beeper to operate continuously for resistance levels under 200 Ω...
  • Page 9 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 c) Voltmeter - Mode of Operation: When the push-to-measure button is up, the Model 1000 Megohmmeter functions as a DC or an AC voltmeter. The input resistance is close to R214 + R215 = 90 K Ω . The voltage is reduced by means of (R212) and (R213) and rectified by the diode (CR10) and (CR11).
  • Page 10 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 d) Ohmmeter - Mode of Operation: Measuring Amplifier (Z5) (RX) CONSTANT CURRENT GENERATOR (R26) Shift from 0 to 0.1 Ohm for Start of Scale The high voltage section is not used when the instrument functions as a ohmmeter.

  • Page 11: Calibration

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 CALIBRATION: Recommended Cleaning Procedures: The exterior should be cleaned periodically with a cloth moistened with water and a mild detergent solution. (Do not use chlorinated solvents or solvents containing hydrocarbons). Wipe the instrument and let it dry completely before using it again.
  • Page 12 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 d) Offset adjustment of the amplifier (Z5) when RX = ∞ (open) • Supply the Model 1000 with 10.5 V DC. • Connect the voltmeter between the T and D solder pins (the ground connection D can be made on the spacer of the high voltage switch.)
  • Page 13 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 NOTE: The 0.1 Ω resistor must include the value of the leads used in the calibration. i) Adjustment of the Short Circuit Current: • Connect an ammeter in series with the battery supply and adjust battery voltage to 9 V DC.

  • Page 14: Taking The Instrument Apart

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 TAKING THE INSTRUMENT APART: Necessary Tools: • Standard screwdriver • 30 W soldering iron • Desoldering iron • Phillips No 2 screwdriver IMPORTANT: This is a high precision instrument. It is very important to keep the printed circuit boards absolutely clean.
  • Page 15 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 D) Removing the Selector Switch Rod: • Place the top panel on the table in an upside down position. • Remove the attachment clamp and then remove the metal washer and spring washer. Lift up the panel in order to remove the selector switch rod.
  • Page 16 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 I) Reassembling the Printed Circuit Boards: • In order to reassemble the printed boards, complete the previously described procedures in reverse, but do not tighten the screws completely. Slide the rod into the selector switch opening to ensure proper alignment of the boards.

  • Page 17: Troubleshooting

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 TROUBLESHOOTING: Check the condition of the batteries before performing any troubleshooting procedures. The green "BAT" light turns of whenever battery condition is lower than approx. 9 Volts (See Section A on page 13).
  • Page 18 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 • Supply voltage to the circuits with a voltage level of 12 V while monitoring the current with an ammeter connected in series. Normal consumption is typically less than 50 mA. • Excessive power consumption may be attributed to a short circuit at (Q1), or to defects in the integrated circuits identified as (Z1), (Z4), and (Z8).
  • Page 19 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 • Check the test points identified as (4), (5), (6), and (8). • Proper functioning at point (6): Check (T1), (CR201), and (C201). • Proper functioning at point (5), but not at point (6): Check (Q1) and (CR2).

  • Page 20: Summary Of Malfunctions

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 Summary of Malfunctions: • Control functions begin at over voltage level between two steps on the selector switch: Leakage from (CR5), (Z4), and (CR6), towards (Z1). • Adjustment of the short-circuit current: Transformer (T1) - (Z1) not operable.
  • Page 21 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 IX. PARTS LIST: MAIN BOARD #679473-93 3.3 K 1/4 W STANDARD 522152M00 18 K 1/4 W STANDARD 521779D00 1.5 K 1/4 W STANDARD 521823L00 100 K 1/4 W STANDARD 521779C00 18 K...
  • Page 22 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 R43 TO R47 RESISTOR NETWORK 682636-79 1/8 W 50 ppm 523921L00 8.87 K 1/8 W 50 ppm 523128G00 10 K 1/8 W 50 ppm 523087G00 10 K 1/8 W 50 ppm 523087G00 4.42 K...
  • Page 23 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 CAPACITOR 0.1 F 100 V 10 % POLY. 524121B20 CAPACITOR 0.1 F 100 V 10 % POLY. 524121B20 CAPACITOR 1 F 50 V ELECTROLITIC ALU. 524401F20 CAPACITOR 0.1 F 100 V 10 % POLY.
  • Page 24 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 C101 CAPACITOR 220 F 16 V CHEMICAL 523124B00 C102 CAPACITOR 2200 F 16 V CHEMICAL 523096K00 E101 90 V DISCHARGER 524540A00 FUSE FAST ACTION FUSE 6 * 32, 0.315 A/ 660V 100.429...

  • Page 25: Mechanical Parts List

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 MECHANICAL PARTS LIST DESCRIPTION for MODEL 1000N PART # SCREW: C M3X6 524087-57 SCREW: M3X8 485503108 SCREW: C M3X25 485103325 SCREW: C M3X10 487103610 SCREW: C M4X16 485104316 LOSSPROOF SCREW: M3X8 677941-54 SIM SCREW: 0 2.84X6.4...
  • Page 26 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 BATTERY HOLDER 524334-00 RING 670201-96 FLAT CABLE (connection between boards) 525090-00 FACEPLATE 686803-82B PREVIOUS MODEL 1000 - DESCRIPTION PART # COAXIAL PLUG 522615-00 FACEPLATE 679502-90 LOCK WASHER 520569C40 RING 670201-96 SOCKET 360806-54 REV.

  • Page 27: Test Points

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 VOLTAGE LEVELS AND OSCILLOGRAMS FOR PROPER OPERATION Unless otherwise indicated, all of the potentials cited herein are direct potentials measured with respect to ground. The respective oscillograms correspond to a situation where the instrument is set at the 500 V / MΩ position with +P =12 V.
  • Page 28 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 MODELS 1000N/5000N POWER SUPPLY Specifications Open Voltage: 10 V ± 5% Output Voltage at Max Load: 9.4 V ± 5% Max Load: 350 mA Ripple: < 2% Peak to Peak Supply Variation: 110 V ± 15% or 220 V ± 15% (45 Hz to 70 Hz)
  • Page 29 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005...

  • Page 30: Main Board

    MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 MAIN BOARD 679473-93 A1: SHORT CIRCUIT ADJ. A2: END OF SCALE A5: 100 MΩ ADJ. OHMETER Ð Ð Ð Ð Ð Ð A4: 1 MΩ ADJ. POINT D = ONE OF THE BOTTOM...
  • Page 31 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 MEASUREMENT BOARD 679298-95 C102 A102 C101 R109 R103C SHORT CONTACT R107 R108 R104 R102 R101 R101 REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal. Man - 1000MAN.DOC 4/21/2005...
  • Page 32 MODEL 1000N REPAIR AND CALIBRATION MANUAL CAT. #185.100 HV BOARD 679299-95 R216 R211 C202 Short Contact R201 Clear Wire (short) C201 Green Wire to Green Terminal R214 R215 Clear Wire R213 C203 Clear Wire From Switch R202C REV. 7: March 13, 2004 FILE LOCATION: Manuals - Cal.

  • Page 33: High Voltage Board

    MODEL 1000N MEGOHMMETER CAT. #185.100 R214 R215 R213 R212 294K 2.67M 249K C203 1µF R9 10K 24.9K R210 1N4148 1/4 TL 084 Measurement Board R202 R203 R204 R205 R206 R207 R208 R209 1/4 TL 084 9.5M 250K 150K 2.4K 22.6K...
  • Page 34 MODEL 1000N MEGOHMMETER CAT. #185.100 A4: 1 M Ω adj. (M Ω scale) A5: 100 MΩ adj. (MΩ scale) 100K 178K 178K 200K 1µF 8.87K 2.2K C16 C17 Rad. 1 0.1µF 0.1µF 47 Ω 2.37K CR11 1N4148 AD536 499 Ω...

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