Simpson 444 Operator's Manual
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Simpson 444 Operator's Manual

Digital micro-ohmmeter
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Model 444
Digital Micro-Ohmmeter
OPERATOR'S MANUAL

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Summary of Contents for Simpson 444

  • Page 1 Model 444 Digital Micro-Ohmmeter OPERATOR’S MANUAL...
  • Page 2 SIMPSON ELECTRIC COMPANY nei- ther assumes nor authorizes any other persons to assume for it any other liability in connection with the sales of its products.
  • Page 3 1010-1:1990 but UL-1244 specifies a slightly different test network. Simpson Electric manufactures test equipment to measure shock hazard as set forth by both specifications. The Simpson Model 228 uses the networks specified by IEC-1010-1 and is suitable for measuring shock hazard as defined in that document.

  • Page 4: Table Of Contents

    Contents 1. INTRODUCTION ................5 Items And Accessories ............... 5 Safety Considerations ................ 5 Technical Data Specifications ............5 2. INSTALLATION .................. 6 Unpacking And Inspection ..............6 Warranty ....................7 Shipping ..................... 7 Power Source Requirements ............. 7 How to Position Instrument While Operating ........7 3.

  • Page 5: Introduction

    20 ohms. It measures by using a small test voltage (100 microvolt maxi- mum) and a 4 wire measurement technique. The measured resistance is dis- played on 4-1/2 digit LCD display. The 444 is designed to be run from the power line, but self-contained rechargeable Ni-Cad batteries are provided for field use.

  • Page 6: Installation

    NOTE: Other optional Kelvin type test leads are available from Simpson Electric. INSTALLATION This section contains instructions for the installation and shipping of the 444. Included are unpacking and inspection procedures, warranty, shipping, power source requirements, and operation positions. Unpacking And Inspection Examine the shipping carton for damage.

  • Page 7: Warranty

    Pack the Instrument carefully and ship it prepaid and insured. Power Source Requirements The Simpson 444 is a power line operated Instrument with built-in recharge- able battery backup. The battery automatically charges when the Instrument is plugged in. The battery may not be charged when the Instrument is shipped.
  • Page 8 Figure 3-1. Front Panel Description This switch is used to enable the audible conti- nuity alarm. Set: This switch is used to display the user adjust- able resistance level which triggers the audible continuity alarm. Level: This control is used to set the resistance level which triggers the audible continuity alarm.

  • Page 9: Operation

    The Model 444 Micro-Ohmmeter is intended for use only by personnel qualified to recognize shock hazards and trained in the safety precau- tions required to avoid possible injury.

  • Page 10: Operating Instructions

    Operating Instructions 4.2.1 AC Measurement Mode The AC measurement mode will provide accurate results on resistances hav- ing negligible inductances. To measure resistance using the AC measure- ment mode: The ALARM SET button and the MODE DC/PULSE buttons must be in the out position.

  • Page 11: Theory Of Operation

    A different approach must be used to measure low resistances where such constraints apply. The Simpson Model 444 is designed to measure resistances down to several micro-ohms without resorting to high test currents used by other micro-ohm- meters.
  • Page 12 In this mode, the test current provided by the Model 444 is auto- matically switched from one direction to the other 40 times each second. The...

  • Page 13: Operator Maintenance

    OPERATOR MAINTENANCE Improper repairs can be dangerous to the operator of the Instrument. Servic- ing other than as described in this section should be performed only by quali- fied personnel. Refer to Authorized Service Centers or factory should Instru- ment require repair or calibration. Cover Removal The bottom cover can be removed for maintenance purposes by the doing the following:...

  • Page 14: Preventive Maintenance

    Preventive Maintenance Do not clean this Instrument with the test leads connected to a power source or when it is connected to the AC power line. Immediately clean all spilled materials from the Instrument and wipe dry. If necessary, moisten a cloth with soap and water to clean plastic sur- faces.
  • Page 15 NOTES:...
  • Page 16 SIMPSON ELECTRIC COMPANY 853 Dundee Avenue Elgin, IL 60120-3090 (847) 697-2260 FAX (847) 697-2272 Printed in U.S.A. Part No. 06-114500 Edition 6, 02/03 Visit us on the web at: www.simpsonelectric.com...

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