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Simpson 270 Series 5

Volt-Ohm-Milliammeter

INSTRUCTION MANUAL

32

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

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Summary of Contents for 270 Series 5

Page 1: ...liammeter INSTRUCTION MANUAL 32 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: ...red by it to be free from defects in material and workmanship under normal use and service its obligation under this warranty being limited to making good at its factory or other article of equipment which shall within one 1 year after delivery of such instrument or other article of equipment to the original purchaser be returned intact to it or to one of its authorized service centers with transp...

Page 3: ...3 NOTES 30 NOTES ...

Page 4: ... DC Voltage Measurement 0 2 5 Through 0 500V Range 16 4 8 DC Voltage Measurement 0 1000v Range 16 4 9 AC Voltage Measurement 0 2 5 Through 0 500V Range 17 4 10 AC Voltage Measurement 0 1000V Range 18 4 11 Output Voltage Measurement 19 4 12 Decibel Measurement 20 to 50 dB 20 4 13 Direct Current Measurement 21 4 14 Direct Current Measurement 0 50 µA Range 21 4 15 Direct Current Measurement 0 1mA thr...

Page 5: ...5 112004 F1 Fuse 1 Amp 250V 3AG 1 1 4 x 1 4 Quick acting Littlefuse Type 312001 1 112507 F2 Fuse 2A 600V Bussman Type BBS or 5 119056 Littlefuse Type BLS For Function Switch 1 115789 Knobs For Zero Ohms Adjust 1 115790 For Range Switch 10 864352 Case Assembly Phenolic Complete including Handleless Battery Compartment Front Cover 10 864996 Cover Assembly 10 861724 Rubber Bumper Plug 5 115039 270 5 ...

Page 6: ...ned in this manual and should be read and understood thoroughly before ordering replacement parts for the Instrument 6 1 Removing the Instrument Case To open the Instrument panel first de energize and disconnect the test leads and remove the cover from the battery compartment Remove the four case fastening screws and lift the case from the panel When replacing the case make certain that the wires ...

Page 7: ...use may be burned out Refer to paragraph 5 3 for fuse replacement A 1 Amp spare fuse is furnished with each Instrument Fuses are located in the battery and fuse compartment NOTE The 0 10A range is not fused The shunt connects directly to the 10A and 10A jacks d Two diodes connected across the meter movement afford protection to the movement by circumventing excessive current around the movement in...

Page 8: ...st probe s to extend the Instrument AC or DC voltage range The test leads and the insulated alligator clips are rated for the voltage and current ranges available on the 270 Maximum ratings are 1000 V AC or DC or 10 DC amperes These ratings for the test leads must not be exceeded in any application 1 8 Technical Data Table 1 1 Technical Data 1 DC VOLTS Ranges 0 1 2 5 10 50 250 500 1000V Sensitivit...

Page 9: ... increasing values of resistance e To determine the actual resistance value multiply the reading by the factor at the switch position K on the OHMS scale equals one thousand 4 19 Resistance Measurement of Semiconductors Make sure that the OHMS range being used will not damage any of the semicon ductors refer to Table 1 1 item 8 Section 1 If there is a forward and backward resistance such as in dio...

Page 10: ... 4 17 Zero Ohms Adjustment When resistance is measured the INTERNAL batteries B1 and B2 furnish power for the circuit Since batteries are subject to variation in voltage and internal resistance the Instrument must be adjusted to zero before measuring a resis tance as follows a Turn range switch to desired ohms range b Plug the black test lead into the COMMON jack and the red test lead into the jac...

Page 11: ...nge positions marked 1 mA 10 mA 100 mA or 500 mA d Turn OFF power Discharge any ca pacitors in circuit e Open the grounded side of the circuit in which the current is being mea sured Connect the VOM in series with the circuit Connect the red test lead to the positive side and the black test lead to the negative side f Turn the power on Read the current in milliamperes on the black DC scale For the...

Page 12: ...rence level subtract 7 dB from the reading obtained on the 270 5 4 13 Direct Current Measurement a Do not change the setting of the range or change the function switches while circuit under measurement is energized b Never disconnect test leads from circuit under measurement while the circuit is energized c Always turn the circuit power off and discharge all the capacitors before setting the switc...

Page 13: ...tion often specially designed instruments operated by specially trained personnel who use appropriate protective equipment and procedures 4 1 Safety Precautions The following precautions are commonly recognized safe practices to adopt and specific hazards to avoid and are not implied to be sufficient to safeguard un trained personnel in all circumstances Neither is this manual a substitute for tec...

Page 14: ...voltage must not exceed the Instrument s rated maximum circuit to ground voltage n Do not measure where the air may contain explosive concentrations of gas or dust such as in mines grain elevators gasoline stations or in the pres ence of charging batteries until determined to be safe by qualified personnel Note that even metallic dusts can be explosive o No general purpose VOM is to be used to mak...

Page 15: ...t the function switch at DC Figure 4 1 b Plug the black test lead into the COMMON jack and the red test lead into the 1V jack c Set the range switch at 1V COMMON position with 2 5V d Connect the black test lead to the negative side of the circuit being measured and the red test lead to the positive side of the circuit e Read the voltage on the black scale marked DC and use the figures marked 18 e ...

Page 16: ...WARNING READ MANUAL BEFORE USE 270 17 charged e Connect the black test lead to the negative side of the circuit being measured and the red test lead to the positive side of the circuit f Turn on power in circuit being measured g Read the voltage using the 0 10 figures on the black scale marked DC Multiply the reading by 100 Turn off power to the circuit and wait until the meter indicates zero befo...

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