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Summary of Contents for Simpson Electric 270 Series 5
- Page 1 Simpson 270 Series 5 Volt-Ohm-Milliammeter INSTRUCTION MANUAL SIMPSON ELECTRIC COMPANY 520 Simpson Avenue Lac du Flambeau, WI 54538-0099 (715) 588-3311 FAX (715) 588-3326 Printed in U.S.A. Part No. 06-111642 Edition 14, 05/07 Visit us on the web at: www.simpsonelectric.com...
- Page 2 SIMPSON ELECTRIC COMPANY neither assumes nor autho- rizes any other persons to assume for it any other liability in connection with the sales of its products.
- Page 3 NOTES NOTES...
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Page 4: Table Of Contents
Contents Schematic Diagram 1. INTRODUCTION ................7 General Description ................7 Overload Protection ................7 Internal Batteries .................. 8 Printed Circuit ..................8 Phenolic Case ..................8 Adjust-A-Vue Handle ................8 Test Leads .................... 8 Technical Data ..................8 Definition of Accuracy ................ 10 1.10 Safety Considerations ................ - Page 5 NOTES Reference Reference Symbol Description Part No. Symbol Description Resistor, 11 , 5W 6-111979 (Bussman Type BBS or 5-119056 Littlefuse Type BLS) (Wire Wound) Resistor, 1.095 k 6-111639 For Function Switch 1-115789 Resistor, 138 6-111640 Knobs: For Zero Ohms Adjust 1-115790 Resistor, 17.320 k 6-111638...
- Page 6 NOTES Verify Instrument accuracy by performing operational checks using known, accurate, stable sources. If proper calibration equipment is not available, contact the nearest Authorized Service Center. If the Instrument has not been used for 30 days, check the batteries for leakage and replace if neces- sary.
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Page 7: Introduction
R x 1 and R x 100 ranges (refer to ZERO OHMS ADJUSTMENT paragraph 4.17) replace the 1.5V battery. When it is no longer possible to The Simpson Volt-Ohm-Milliammeter 270 Series 5 is a rugged, accurate, com- adjust the pointer to zero on the R x 10,000 range, replace the 9V battery. -
Page 8: Internal Batteries
Internal Batteries OPERATOR SERVICING The following paragraphs describe the battery replacement, fuse replacement, There are two batteries in the ohmmeter circuits, a NEDA 13F size D cell that test lead inspection and care for the 270-5. furnishes 1.5-volts for the R x 1 and R x 100 ranges and a NEDA 1604 battery that furnishes 9-volts for the R x 10,000 range. -
Page 9: Bussman Type Bbs Or
Note: The OHMS scale reads from right to left for increasing values of resistance. 4. OUTPUT VOLTAGE (AC): Ranges: 0-2.5-10-50-250 (limited to 350 VDC) To determine the actual resistance value, multiply the reading by the factor at 5. DC MICROAMPERES: the switch position. -
Page 10: Definition Of Accuracy
4.17 Zero Ohms Adjustment **Responds to the average value of an AC current, and is calibrated to indicate the RMS value of a pure sine wave. ***Per ANSI C39.5 April 1974: “The maximum voltage, with respect to Ground, When resistance is measured, the INTERNAL batteries B1 and B2 furnish power which may safely and continuously be applied to the circuit of an Instrument.”... -
Page 11: Installation
Current test leads. Warranty Restore circuit to original condition. The Simpson Electric Company warranty policy is printed on the inside front 4.16 Direct Current Measurement 0-10A Range cover of this manual. Read the warranty policy carefully before requesting any warranty repairs. For all assistance, including help with the Instrument under warranty, contact the nearest Authorized Service Center for instructions. -
Page 12: Controls, Jacks And Indicators
CONTROLS, JACKS AND INDICATORS All operating and adjustment controls, jacks and indicators for the Simpson 270- y l t 5 are described in this section. Become familiar with each item before operating the Instrument. Front Panel Description The front panel controls, jacks and indicators are described in Table 3-1 and illus- trated in Figure 3-1. -
Page 13: Operation
Turn OFF power. Off/Transit Position: This function switch position opens Connect the test leads across the cir- the 270 common and + jack inputs to avoid accidental cuit being measured with the black instrument overload or internal battery drain. It also test lead to the ground side. -
Page 14: Polarity Reversing
The 270 should only be used by personnel qualified to recognize shock hazards and who are trained in the safety precautions required to avoid possible injury. Do not connect any terminal of this Instrument to a circuit point at which a Turn off power to the circuit and wait until the meter indicates zero before discon- voltage exceeding 1000 volts AC or DC may exist with respect to earth necting the test leads. -
Page 15: Measurement Of Unknown Voltage Or Current
Connect the test leads across the cir- circuit power. When making measurements on the 50µA/250mV, 1 volt, or 10 amp cuit voltage to be measured with the range, polarity can be corrected only by interchanging the test lead connector to black lead to the grounded side. -
Page 16: Dc Voltage Measurement 0-2.5 Through 0-500V Range
0-10. Then divide the reading by 10. charged. Connect the black test lead to the negative side of the circuit being measured DC Voltage Measurement 0-2.5 Through 0-500V Range. and the red test lead to the positive side of the circuit. Turn on power in circuit being measured.
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