Simpson 260® Series 8 Volt-Ohm-Milliammeters INSTRUCTION
Contents
1. 4 13 Output Voltage Measurement It s often necessary to measure the AC component of an Output Voltage where both AC and DC voltage levels exist This occurs primarily in amplifier circuits The 260 8 has a 0 1 mfd 400 volt capacitor in series with the OUTPUT jack The capacitor blocks the DC component of the current in the test circuit but al en 2 5 VAC RANGE lows the AC or desired compo JOVAG RANGE nent to pass on to the indicating NE instrument circuit The blocking capacitor may alter the AC re sponse at low frequencies but is usually ignored at audio fre quencies Figure 4 8 Do not connect the OUTPUT jack to a circuit in which the DC voltage component exceeds 350V Figure 4 8 Frequency 10Hz 100Hz 1KHz 10KHz 100KHz 1MHz Response Output Ranges FREQUENCY 21 Before proceeding with the fol lowing steps review the Safety WE N Precautions in Paragraph 4 1 EN a Set the function switch to AG volts only position Fig ure 4 9 b Plug the black test lead into y the COMMON jack and the apis red test lead into the OUT gm Q epos vi 260 i ALLTERMINALS 1V MAX I FH PUT jack c Set the range switch at one Figure 4 9 Jacks and Switch Positions for Output Measurements of the range positions marked 2 5V 10V 25V 50V or 250V d Connect the test leads across the circuit being mea sured wit2. nsuunnessnnnnnnnneeenneeenn 12 3 1 Front Panel Description 44444444 ahiretit 12 4 OPERATION as een engere ne dene tet 14 4 1 Safety Precautions unnenssenssnnnnnnnnnnonnnnnnnnnnnnnnnnnnnnnonnnnnnnnnnnnnnnnnnn 14 4 2 Polarity Reversing catala opakt inten tte 15 4 3 Measurement of Unknown Voltage or Current 15 4 4 Test Leads miii aida 15 4 5 DC Voltage Measurement 0 250mV Range mrnnrnnnvnnnnrnnrrnnnnrnennnnen 16 4 6 DC Voltage Measurement 0 1V Range anrnnnvnnnnvnnnnvnnnrnrsnrnnnvnnrnrenn 16 4 7 DC Voltage Measurement 0 2 5 0 250V Range een 17 4 8 DC Voltage Measurement 0 500V Range merrnrrvrnenvnrnvnnrnrnnnrnrrnreen 17 4 9 DC Voltage Measurement 0 1000V Range mrnvrnnnvnnnnvnenvennnrnenrenen 18 4 10 AC Voltage Measurement 0 2 5 0 250V Range seese 18 4 11 AC Voltage Measurement 0 500V Range manrrnenrnnnnnnnnrnrrvrnrnrnennnnen 19 4 12 AC Voltage Measurement 0 1000V Range ccocociocccoccconccconcconccnancnns 20 4 13 Output Voltage Measurement ranrnnnnnnnnrnnnvnnnnrnervnnnnvnrnrnrsnrernrnrrnreenn 21 4 14 Decibel Measurement 20 to 50 dB uersenenesenennnsnnner nennen 22 4 15 Direct Current Measurement cccocococcncnnnoonnnncnononnnnnnnonononnnnnnnnnonannnoos 23 4 15 1 Direct Current Measurement 0 50uA Range esec 23 4 15 2 Direct Current Measurement 0 1mA through 0 500mA Range 24 4 15 3 Direct Current Measurement 0 10A range 4 16 Resistance Measur
3. Simpson 260 Series 8 Volt Ohm Milliammeters INSTRUCTION MANUAL About this Manual To the best of our knowledge and at the time written the information contained in this document is technically correct and the procedures accurate and adequate to operate this instrument in compliance with its original advertised specifica tions Notes and Safety Information This Operator s Manual contains warning symbols which alert the user to check for hazardous conditions These appear throughout this manual where appli cable and are defined below To ensure the safety of operating performance of this instrument these instructions must be adhered to Warning refer to accompanying documents AN Caution risk of electric shock AN This instrument is designed to prevent accidental shock to the operator when properly used However no engineering design can render safe an instrument which is used carelessly Therefore this manual must be read carefully and com pletely before making any measurements Failure to follow directions can result in serious or fatal accident Shock Hazard As defined in American National Standard C39 5 Safety Re quirements for Electrical and Electronic Measuring and Controlling Instrumenta tion a shock hazard shall be considered to exist at any part involving a potential in excess of 30 volts RMS sine wave or 42 4 volts DC or peak and where a leakage current from that part to ground exceeds 0 5 milli
4. forward and reverse bias resis tance measurements consider the following before making the measurement a The polarity of the battery voltage will be as marked at the jacks when the switch is in the DC position and reversed in the DC position b Ensure that the range selected will not damage the semiconductor Refer to Table 1 1 item 8 and review the specification limits of the semiconductor according to the manufacturer s ratings c If the semiconductor is a silicon diode or conventional silicon transistor no precautions are normally required d If the semiconductor material is germanium check the ratings of the device and refer to Table 1 1 item 8 NOTE The resistance of diodes will measure differently from one resistance range to another on the VOM with the function switch in a given position For example a diode which measures 80 ohms on the R X 1 range may measure 300 ohms on the R X 100 range The difference in values is a result of the diode characteristics and is not indicative of any fault in the VOM switch position K on the OHMS scale equals one Ww thousand Figure 4 12 Jacks and Switch Positions for Measuring Resistance 26 5 OPERATOR MAINTENANCE The following paragraphs in this section describe battery replacement fuse re placement and preventive maintenance procedures for the 260 8 5 1 Inspect
5. marked DC For the 2 5V range use the 0 250 figures and divide by 100 Forthe 10V 50V and 250V ranges read the figures directly For the 25V range use the 0 250 figures and divide by 10 NOTE Turn off power to the circuit and wait until the meter indicates zero before disconnecting the test leads 4 8 DC Voltage Measurement 0 500V Range A Use extreme care when working with high voltage circuits Do not touch the Instrument or test leads while power is on in the circuit being measured Before proceeding with the following steps review the Safety Precautions in paragraph 4 1 a Set the function switch at DC Fig 7 ure 4 2 b Set the range switch at the 250V 500V 1000V position c Plug the black test lead into the COMMON jack and the red test lead into the 500V jack d Be sure power is off in the circuit be ing measured and all capacitors dis charged Connect the black test lead FY to the negative side of the circuit be adi ing measured and the red test lead i to the positive side of the circuit af y e Turn on power in circuit being mea Per sured BR ay oe f Read the voltage using the 0 50 fig 7 O ures on the black scale marked DC W Multiply the reading by 10 NOTE Turn off power to the circuit and Figure 4 2 Jacks and Switch wait until the meter indicates zero before Positions for Measur
6. the need to hand hold test prods to a circuit for extended periods the test clips also reduce hand proximity to a high voltage circuit while energized Circuit power must of course be turned off and any charged capacitors discharged before connecting or disconnecting clips to or from the current 15 4 5 4 6 a b DC Voltage Measurement 0 250mV Range Before making voltage measurements review the SAFETY PRECAUTIONS listed in paragraph 4 1 Also when using the 260 as a millivoltmeter care must be taken to prevent damage to the indicating instrument from excessive voltage Before using the 250 millivolt range use the 1 0 volt DC range to determine that the voltage measured is not greater than 250 millivolts or 25 volt DC Set the function switch at DC Figure 4 1 Plug the black test lead into the COMMON jack and the red test lead into the 50 uA 250mV jack Set the range switch at 50 yA common position with 50V 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 Read the voltage on the black scale marked DC and use the figures marked 0 250 Read directly in millivolts NOTE For polarity reversing see paragraph 4 2 DC Voltage Measurement 0 1V Range Set the function switch at DC Fig ure 4 1 Plug the black test lead into the COMMON jack and the red test lead into the 1V jack Set the range switch at
7. 1MA D C 50A AOS or COMMON 4 260 Figure 4 11 Jacks and Switch Positions for Measuring Direct Current A This range is only intended for measurements in low voltage circuits under 25 V DC such as the primary power in vehicles or their accessories 4 15 3 Direct Current Measurement 0 10A range a Plug the black test lead into the 10A jack and the red test lead into the 10A jack b Set the range switch at 10 AMPS dual position with 10 mA c Open the grounded side of the circuit in which the current is being measured Connect the VOM in series with the circuit connecting the red test lead to the positive side and the black test lead to the negative side NOTE The function switch has no effect on polarity for the 10 AMPS range d Turn the power on Read the current directly on the black DC scale Use the 0 10 figures to read directly in amperes 24 e Turn the power off and disconnect the test leads A NOTE The 10A range is not internally fused in the 260 8 When using the 10A range never disconnect a test lead from a jack or from the circuit while the circuit is energized Doing so may damage the test jacks or leads and the arcing may be hazardous to the operator Turn off circuit power and wait for the meter reading to drop to zero The polarity reversing feature of the function switch does not operate on the 0 10A range If polarity is found to be incorrect turn off circuit power
8. 1V com mon position with 10V 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 Read the voltage on the black scale marked DC and use the fig ures marked 0 10 Then divide the reading by 10 gt COMMON 4 De NV 0C wan nk ALLTERMINALSIV MAX I NS O Figure 4 1 Jacks and Switch Positions for Measuring DC Voltages 0 through 250V Ranges NOTE For polarity reversing see paragraph 4 2 16 4 7 DC Voltage Measurement 0 2 5 0 250V Range a Set 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 jack c Set the range switch at one of the five voltage range positions marked 2 5V 10V 25V 50V or 250V NOTE When in doubt as to the voltage present always use the highest voltage range as a protection to the Instrument If the voltage is within a lower range the switch may be set for the lower range to obtain a more accurate reading Be sure power is off in the circuit being measured and all capacitors discharged 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 Turn on the power in the circuit being measured f Read the voltage on the black scale
9. DA 1604 battery that furnishes 9 volts for the R X 10 000 range The 1 5 volt D cell is held in place with two spring clips which also serve as battery contacts The polarity symbols for the D cell are marked near the battery contacts The 9 volt battery is held in place with a spring clip but contact is made with a separate connector that is polarized Always observe correct polarity when replacing the 1 5 volt D cell 7 1 4 1 5 1 6 1 7 1 8 Printed Circuit Most of the component parts are mounted on a printed circuit board which simpli fies assembly and maintenance thus extending the useful life of the Instrument Phenolic Case The phenolic case has heavy reinforced walls for maximum durability and pro vides excellent protection for the circuit components Batteries and fuses can be accessed by unscrewing a single captivated screw at the bottom of the case and sliding out the compartment cover Rubber plug bumpers on the bottom of the case reduce sliding should the 260 be accidentally pulled by the test leads when the Instrument is on a workbench Adjust A Vue Handle A carrying handle is attached to the Instrument case The handle may be used to support the Instrument in a convenient sloping position for easy viewing The case can also be placed in either a vertical or horizontal position The horizontal position provides greater accuracy since the Instrument is calibrated in this posi tion Test Leads Each Instru
10. IT POWER AND DISCHARGE ANY CAPACITANCE IN THE CIR CUIT BEFORE CONNECTING OR DISCONNECTING TEST LEADS OR CHANG ING SWITCH SETTINGS B DOUBLE CHECK FOR CORRECT SWITCH SETTINGS AND TEST LEAD CONNEC TIONS BEFORE APPLYING POWER DO NOT TOUCH THE INSTRUMENT TEST LEADS OR CIRCUIT WHILE POWER IS ON D DO NOT USE ANY INSTRUMENT OR TEST LEADS THAT ARE DAMAGED CON TAMINATED DETERIORATED MOIST OR WHICH HAVE MISSING PARTS 4 READ THE OPERATOR S MANUAL FOR ADDITIONAL PRECAUTIONS AND IN STRUCTIONS MADE IN U S A BY O SIMPSON ELECTRIC COMPANY Ne ELGIN ILLINOIS z Figure 5 1 Battery and Fuse Compartment a Two batteries supply power for resistance measurements a 1 5 volt D cell and a 9 volt battery When it is no longer possible to adjust the pointer to zero for the R X 1 and R X 100 ranges refer to ZERO OHMS ADJUSTMENT paragraph 4 16 replace the 1 5 volt cell When it is no longer possible to adjust the pointer to zero on the R X 10 000 range replace the 9 volt battery b To install or replace a battery de energize and disconnect test leads from the Instrument then remove the cover to the externally accessible battery com partment by loosening the single captivated screw 27 5 3 5 4 5 5 NOTE Batteries should be replaced before their useful life has expired Failure to do so may result in corrosion and battery leakage c Observe polarity when replacing the 1 5 volt D cell and connect as indicated T
11. MMON jack and the red test lead into the jack d Turn off power to the circuit to be measured and discharge any capacitors e Connect the test leads across the circuit voltage to be mea sured with the black lead to the y 4 grounded side w f For the 2 5V range read the value directly on the scale M marked 2 5 VAC For the 10V 25V 50V and 250V ranges read the red scale marked AC and I ALLTERMINALS1V MAX I PERGENT RELATIVE ERROR 10Hz 100Hz 1KHz 10KHz FREQUENCY FIGURE 4 4 Frequency Response AC Voltage Ranges 100KHz 1MHz use the black figure immedi ately above the scale it WEE Figure 4 5 Jacks and Switch Positions for Measuring AC Voltage 0 2 5 through 0 250V Ranges COMMON 4 11 Use extreme care when working in high voltage circuits Do not handle the Instrument or test leads while the circuit being measured is energized OB SERVE ALL SAFETY PRECAUTIONS in paragraph 4 1 and in the instruction manual for the equipment being tested 19 AC Voltage Measurement 0 500V Range Do not attempt any voltage measurement which may exceed 1000 volts or the circuit to ground voltage of the Instrument 1000 volts maximum Be sure that the range switch is set to the 250V 500V 1000V range function switch to AG volts only position and test leads connected to common and 500V jack Do not touch t
12. 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 e Itis recommended that the Instrument be returned annually to the nearest Authorized Service Center or to the factory for an overall check adjustment and calibration f When not in use store the Instrument in a room free from temperature ex tremes dust corrosive fumes and mechanical vibration or shock If storage time is expected to exceed 30 days remove batteries 28 NOTES 29 NOTES 30 NOTES 31 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 114338 Edition 10 1 02 Visit us on the web at www simpsonelectric com
13. ails 6 Pointer Adjust For Zero This control is used to mechanically zero the Instru ment With the function switch set to an operating position DC DC or AG volts only and no ap plied input the pointer should read zero If it does not use a screwdriver to turn this adjustment until it does Once this adjustmentis made back off slightly so that the pointer rests freely over the zero mark 13 4 OPERATION A Multifunction instruments VOM s such as the 260 8 are intended as general purpose measuring Instruments for use in low power circuitry such as found in consumer appliances TV and radio receivers and in general laboratory applica tions Their use is not recommended in high voltage high power circuitry where operator errors and inadequate personal protective measures could result in serious injury from arcing or explosion Such circuitry is found in industrial or commercial applications such as induction r f heaters and broadcast transmit ters power substations and distribution centers x ray equipment large motor controls etc Working in the high voltage section of such equipment requires single function often specially designed instruments used by specially trained personnel using appropriate protective equipment and procedures This section of the manual contains information required to operate the 260 8 in a safe and proper manner 4 1 Safety Precautions The following precautions are suggestions of c
14. ampere when mea sured with an appropriate measuring instrument defined in Section 11 6 1 of ANSI C 39 5 Technical Assistance SIMPSON ELECTRIC COMPANY offers assistance Monday through Friday 7 30 am to 5 00 pm Central Time by contacting Technical Support or Customer Service at 847 697 2260 Internet http www simpsonelectric com Warranty and Returns SIMPSON ELECTRIC COMPANY warrants each instrument and other articles manufactured 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 transportation charges prepaid and which its examination shall disclose to its satisfaction to have been thus defective this warranty being expressly in lieu of all other warranties expressed or implied and of all other obligations or liabilities on its part and 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 This warranty shall not apply to any instrument or other article of equipment which shall have been repaired or altered outside the SIMPSON ELECTRIC COMPANY factory or authorized service centers nor which ha
15. and operating position Unpacking and Inspection Examine the shipping carton for signs of damage If damaged notify the carrier and supplier and do not attempt to use the Instrument If Instrument appears to be in good condition read Operator s Manual in its entirety Become familiar with the Instrument as instructed in the manual then check the electrical performance as soon as possible Also check that all items listed in Table 1 2 are included with the Instrument After unpacking the Instrument a 1 5V battery and a 9V battery may be found in separate envelopes in the box with the Instrument and the test leads Two alliga tor clips for the test leads are in a polyethylene bag See Section 5 for instruc tions on how to install the batteries Warranty The Simpson Electric Company warranty policy is printed on the inside front cover of this manual Read it carefully before requesting any warranty repairs For all assistance including help with the Instrument under warranty contact the nearest Authorized Service Center If necessary contact the factory directly give full details of any installation difficulty and include the Instrument model number series number and date of purchase Service data or shipping instructions will be mailed promptly If an estimate of charges for non warranty or other service work is required a maximum charge estimate will be quoted This charge will not be exceeded without prior approval Pack the I
16. e instruction manual for the equipment being tested Do not attempt any voltage measure ment which may exceed 1000 volts or the circuit to ground voltage of the Instru ment 1000 volts maximum Be sure that the range switch is set to the 250V 500V 1000V range function switch to AC Volts Only position and test leads connected to common and 1000V 20 jack Do not touch the Instrument or test leads while the power is on in the circuit being measured Before proceeding with the fol lowing steps review the Safety NG S Precautions in Paragraph 4 1 a NN a Set the function switch at AC Figure 4 7 b Set the range switch at 250V 500V 1000V position 6 c Plug the black test lead into e te the COMMON jack and the g A Y red test lead in the 1000V jack d Be sure the power is off in the circuit being measured and that all its capacitors have been discharged e Connect the test leads kst ok i 5 ONLY 251 ZERO OHM across the circuit voltage to ww be measured with the black EN lead to the grounded side zov COMMON 1000v Pre f Turn on the power in the cir cuit being measured RN auremmaussvua I O Gh g Read the voltage on the red scale marked AC Use the 0 10 figures and multiply by 100 FIGURE 4 7 Jacks and Switch Positions for Measuring AC Voltage 0 Through 1000V Range Va A CNOLTS N
17. ement cocccccccccccocononononononononnnnnnnnonononononononons h 4 16 1 Measuring Resistance rnsnrnnnrnnvrnnvrnvvvnnvannvenvrensvrnrvensrersvenrrenvvensvene 4 16 2 Resistance Measurement of Semiconductors uu eee 26 5 OPERATOR MAINTENANCE coocccccoococncccnnnnononnnnnnnnonnnnncncnnnnannoncnnnnos 27 5 1 Inspections ad 27 5 2 Battery Replacement r r444u4n nenne nnnonennnnnnennnnnennnennennnnnn nennen 27 5 3 Fuse Replacement eiii niert Bien 28 5 4 Test Lead Inspeccion ct do een 28 A AO 28 NOTES NOTES 1 1 1 1 2 1 3 INTRODUCTION General Description The Simpson Volt Ohm Milliammeter 260 Series 8 hereafter referred to as the 260 or as the Instrument is a rugged accurate compact easy to use Instrument equipped with mirrored dial to eliminate parallax The Instrument can be used to make accurate measurements of AC and DC voltage direct current resistance decibels and Output Voltage The Output Voltage function is used for measuring the AC component of a mixture of AC and DC voltage This occurs primarily in amplifier circuits New Features in the 260 8 are 0 25V AC DC Range Mirrored Dial Overload Protection No single protective device nor even a combination of devices as found in the 260 can fully protect a multipurpose Instrument under all overload conditions Overloads of such severity as to damage the Instrument despite all the built in protection provided are possible when the Instrument i
18. ged Disconnect shunting components from the circuit before measuring its resistance b Set the range switch to one of the resistance range positions as follows Figure 4 12 1 Use R X 1 for resistance readings from 0 to 200 ohms 2 Use R X 100 for resistance readings from 200 to 20 000 ohms 3 Use R X 10 000 for resistance readings above 20 000 ohms c Set the function switch at either DC or DC position Operation is the same in either position unless there are semiconductors in the circuit See para graph 4 16 2 Adjust ZERO OHMS control for each resistance range 25 NOTE The OHMS scale reads d Observe the reading on the OHMS scale at the top of the NG DN dial K from right to left for increasing values of resistance e To determine the actual re sistance value multiply the reading by the factor at the 0 bumpen 260 4 16 2 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 I If there is a forward and backward resistance such as in diodes the resistance should be relatively low in one direction for forward polarity and higher in the opposite direction Rotate the function switch between the two DC positions to reverse polarity This will determine if there is a difference between the resistance in the two directions To check a semiconductor in or out of a circuit
19. h This switch may be rotated in either direction to select any one of the available voltage current or resistance ranges 3 Function Switch The function switch has four positions Off DC DG and AC Volts Only To measure DC current or voltage set the function switch at the DC or DC position depending on the polarity of the input sig nal To measure AC voltage set the function switch to the AC position For resistance measurement the switch may be set in either the DC or DC position The polarity of the test voltage will be as marked at the jacks when the switch is in the DC position and reversed in the DC position Set this switch to off when not using the meter to take mea surements 4 Zero Ohms This control is used when measuring resistance to calibrate the ohms range selected to read zero with the test leads shorted Refer to paragraph 4 20 12 Figure 3 1 5 Circuit Jacks 104 OUTPUT 3504 ACNOLTS wax ONLY Bon ZERO _OMMS Front Panel Controls Jacks and Indicators There are eight jacks on the front panel marked with the functions they represent These jacks pro vide the electrical connections to the test leads The COMMON jack is used as the reference point for the measurement of all the functions with the exception of the 10A range Refer to the Opera tion Section 4 for det
20. h the black test lead to the ground side e Turn on the power in the test circuit Read the output volt age on the appropriate AC voltage scale For the 0 2 5V range read the value directly on the scale marked 2 5 VAC For the 10V 25V 50V or 250V ranges use the red scale marked AC and read the black figures immediately above the scale 4 14 Decibel Measurement 20 to 50 dB Some industries measure in terms of voltage or current ratios WE Ny decibels based on a specific 18 N reference level The dB scale on the 260 8 serves this purpose and is calibrated to a reference level zero dB of 0 001 watt into 600 ohms The scale calibration RO to of 20 to 10 dB is for the 0 2 5V i range zero dB 0 775V Higher ranges may be used by adding an appropriate dB value to the reading in accordance with the chart on page 23 a Review the safety precau tions in paragraph 4 1 b Refer to Figure 4 10 for switch settings and jack connections Figure 4 10 Jacks and Switch Positions for Measuring Decibels 22 C Use operating instructions for AC VOLTAGE MEASUREMENT 0 2 5 10 25 50 250V RANGES paragraph 4 10 NOTE Do not use the 500V or 1000V ranges for decibel readings d Read decibels on the bottom scale marked dB For the 10 25 50 250V ranges add the appro
21. he D cell is held in place with spring clips which also act as battery contact clips The 9 volt battery contacts and connector are polarized To remove the 9 volt battery first withdraw battery with mated connector from the compart ment Then remove the connector Fuse Replacement The 1 and 2 ampere fuse also the 1A spare is located in the externally acces sible battery and fuse compartment Access compartment by disconnecting the test leads and loosening the single captivated screw on the compartment cover To replace or check a fuse apply pressure to the 1 amp fuse cup then rotate the plate to expose a selected fuse for removal from the panel s cavity NOTE When replacing fuses it is important to use the same type and value as the ones you have removed Test Lead Inspection Periodic inspection of the test leads is recommended to detect cuts burned ar eas deterioration or other damage that could reduce the insulation strength of leads Care a Immediately clean all spilled materials from the Instrument and wipe dry If the spillage is corrosive use a suitable cleaner to neutralize the corrosive action b When the Instrument is not in use rotate the function switch to the OFF position c Avoid prolonged exposure or usage in areas which are subject to tempera ture and humidity extremes vibration or mechanical shock dust or corrosive fumes or strong electrical or electromagnetic interferences d Verify Instrument
22. he Instrument or test leads while the power is on the circuit being measured Before proceeding with the following steps review the Safety Precautions in Paragraph 4 1 a Set the function switch to AC Volts Only position Figure 4 6 A NOTE When making AC voltage measurements with the function switch incorrectly set to DC the Instrument pointer will remain at or near zero in dicating a false no voltage present condition that could be hazardous b Set the range switch at 250V Sineo 500V 1000V position on asu zen vie c Plug the black test lead into the bl COMMON jack and the red test Bis A lead in the 500V jack common mos 2 d Be sure the power is off in the NE auremmarsienn L O Yy circuit being measured and that all its capacitors have been dis nr EEE th FIGURE 4 6 Jacks and Switch ONAPI eads Across ine Positions for Measuring AC Voltage circuit voltage to be measured 2 with the black lead to the pe Ranas grounded side f Turn on the power in the circuit being measured g Read the voltage on the red scale marked AC Use the 0 50 figures and multiply by 10 4 12 AC Voltage Measurement 0 1000V Range Use extreme care when working in high voltage circuits Do not handle the Instrument or test leads while the circuit being measured is energized OB SERVE ALL SAFETY PRECAUTIONS in paragraph 4 1 and in th
23. ich the current is being measured 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 Read the current on the black DC scale Use the 0 50 figures to read directly in microamperes NOTE For polarity reversing see paragraph 4 2 23 4 15 2 Direct Current Measurement 0 1mA through 0 500mA Range a Set the function switch at DC Figure 4 11 b Plug the black test lead into the COMMON jack and the red test lead into the jack c Set the range switch at one of the four range positions marked 1 mA 10 mA 100 mA or 500 mA d Open the grounded side of the circuit in which the cur rent is being measured 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 e Turn the power on Read the current in milliamperes on the black DC scale For the 1 mA range use the 0 10 figures and divide by 10 For the 10 mA range use the 0 10 figures directly For the 100 mA range use the 0 10 figures and multi ply by 10 For the 500 mA range use the 0 50 figures and multiply by 10 f Turn the power off and dis connect the test leads NE O AN ALLTERMINALSIVMAX I Simp O Q HA 50 pANPS 350VDC ACNOLTS max S00MA JO0M FBO MV ONIX 10MA AMPS DE
24. ing DC Voltage disconnecting the test leads 0 500V Range 17 49 DC Voltage Measurement 0 1000V Range Use extreme care when working with high voltage circuits Do not touch the Instrument or test leads while power is on in the circuit being measured Before proceeding with the following steps review the Safety Precautions in paragraph 4 1 a Setthe function switch at DC Fig ure 4 3 7 b Set the range switch at the 250V 500V 1000V position c Plug the black test lead into the COMMON jack and the red test lead into the 1000V jack d Be sure power is off in the circuit being measured and all capacitors discharged Connect the black test lead to the negative side of the cir cuit being measured and the red test lead to the positive side of the BATI circuit R Jy e Turn on power in circuit being mea 20 E sured T f Read the voltage using the 0 10 fig op n m Fr ures on the black scale marked DC NE autemmaus vma 2 O Ly Multiply the reading by 100 NOTE Turn off power to the circuit and Figure 4 3 Jacks and Switch wait until the meter indicates zero Positions for Measuring DC before disconnecting the test leads Voltage 0 1000V Range 4 10 AC Voltage Measurement 0 2 5 0 250V Range A Branch and distribution circuits 120 240 480V etc can deliver dangerous ex plosive power momentarily int
25. ion The user is protected from electrical shock by the insulation of the 260 and its test leads Frequently examine them for any insulation damage such as cracks cuts chips burns or deterioration that expose internal metal parts or reduce the spac ing between such metal parts and hand contact by the operator Make certain that the battery compartment cover is securely fastened in place before the Instrument is used Do not use an Instrument with a broken meter glass If the battery compartment cover is removed for any reason check that the proper fuses are being used 5 2 Battery Replacement SPARE 1A FUSE 2A FUSE 9V BATTERY WARNING TO AVOID ELECTRIC SHOCK MAKE CERTAIN THAT THE TEST LEADS ARE DISCON NECTED FROM ANY CIRCUITS BEFORE REMOVING THE BATTERY AND FUSE COM PARTMENT COVER DO NOT ATTEMPT ANY FURTHER DISASSEMBLY NO OTHER USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL CARELESSNESS AND MISUSE OF THIS INSTRUMENT CAN BE DANGEROUS BEFORE CONNECTING THIS INSTRUMENT CAREFULLY READ THE INSTRUCTIONS AND PRECAUTIONS IN THE OPERATOR S MANUAL FAILURE TO FOLLOW INSTRUC TIONS CAN RESULT IN A SERIOUS OR FATAL INJURY SAFETY TIPS DO NOT ATTEMPT ANY MEASUREMENTS UNLESS TRAINED QUALIFIED AND AUTHORIZED TO DO SO DO NOT CONNECT TO ANY CIRCUIT WHERE THE VOLTAGE WITH RESPECT TO EARTH GROUND MAY EXCEED 1000 VOLTS WHENEVER MAKING MEASUREMENTS WITH THIS INSTRUMENT TURN OFF CIRCU
26. ment is furnished with one pair Catalog Number 00043 of probe type test leads one red and one black each 48 inches long for all applications of the Instrument These test leads have elbow prods on one end to connect the leads to the recessed jacks on the Instrument front panel The probe tips at the opposite end have threaded shoulders to accept the screw on insulated alligator clips furnished with the test leads or the 5000 volt test 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 260 Maximum ratings are 1000V AC or DC or 10 DC amperes NOTE These ratings for the test leads must not be exceeded in any application Technical Data TABLE 1 1 Technical Data for the 260 8 1 DCVOLTS Ranges 0 1 2 5 10 25 50 250 500 1000V Sensitivity 20 000 ohms per volt 2 DC MILLIVOLTS Range 0 250mV Sensitivity 20 000 ohms per volt 3 ACVOLTS Ranges 0 2 5 10 25 50 250 500 1000V Sensitivity 5 000 ohms per volt 4 OUTPUT VOLTAGE AC Ranges 0 2 5 10 25 50 250 limited to 350 VDC 8 5 DC MICROAMPERES Range 0 50uA Voltage Drop 250mV 6 DC MILLIAMPERES Ranges 0 1 10 100 500 mA Voltage Drop Approx 250 mV 255 mV 300 mV 500 mV 7 DCAMPERES Range 0 10A Voltage Drop Approx 255 mV NOTE The 10A range is not internally fused Range 0 2 0000 0 200 0000 0 20 MO Center Reading 12000 120 0000 N
27. nstrument carefully and ship it prepaid and insured 11 2 3 Power Source Requirements There are two batteries in the ohmmeter circuits a NEDA 13F D size cell that 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 The 1 5 volt D cell is held in place with two spring clips which also serve as battery contacts The 9 volt battery is held in place with a spring clip but contact is made with a separate connector that is polarized Always observe correct polarity when replacing the 1 5 volt D cell 2 4 Operating Position A handle is attached to the side of the Instrument case The handle may be used to support the Instrument in a convenient sloping position for easy viewing The VOM case can also be placed either in a vertical or horizontal position The horizontal position promises greater accuracy since the Instrument is calibrated in this position 3 CONTROLS JACKS AND INDICATORS The functions of all the controls jacks and indicators used to operate the Simpson 260 8 are described in this section Become familiar with each item before oper ating the Instrument 3 1 Front Panel Description Figure 3 1 depicts the front panel controls jacks and indicators described below 1 Front Panel The 260 8 Volt Ohm Milliammeter is a large easy to read 4 1 4 indicating Instrument Below the In strument are four controls and eight circuit jacks 2 Range Switc
28. o a short circuit before the fuse breaker opens the circuit Make certain that the Instrument switches are set properly jacks are connected properly and that the circuit power is turned off before making con nections to such circuits The 260 responds to the average value of an AC waveform It is calibrated in terms of the RMS value of a pure sine wave If the waveform is nonsinusoidal and depending upon its waveform the reading may be either higher or lower than the true RMS value of the measured voltage Thus an error may be introduced if the 260 is used to measure a nonsinusoidal waveform Also accuracy is lessened at higher input frequencies Figure 4 4 18 Before proceeding with the following steps review the Safety Precautions in Paragraph 4 1 a Set the function switch to AC Volts Only position Figure 4 5 NOTE The meter will not indicate if the switch is incorrectly set to a DC position AG VOLTAGE RANGES 2 5 VAC RANGE 10 VAC RANGE 25 VAC RANGE 50 VAC RANGE 250 VAC RANGE 500 VAC RANGE _ 1000 VAC RANGE b Set the range switch at one of the five voltage range positions marked 2 5V 10V 25V 50V or 250V When in doubt as to ac tual voltage present always use the highest voltage range as a protection to the Instru ment If the voltage is within a lower range the switch may be set for the lower range to ob tain a more accurate reading c Plug the black test lead into the CO
29. ominal Open Circuit 1 5V 1 5V 9V Voltage Nominal Short Circuit 125mA 1 25mA 75uA Current 9 ACCURACY DC Voltage Ranges 2 of Full Scale DC Current 0 50 uA Range 1 5 of Full Scale Other Ranges 2 of Full Scale AC Voltage Ranges 3 of Full Scale Frequency Response Referenced to 100 Hz Figures 4 4 and 4 9 Resistance Ranges RX1 2 5 of Arc R X 100 2 of Arc RX 10 000 2 of Arc Accuracies specified are for the 260 in a horizontal position Responds to the average value of an AC current and is calibrated to indicate the RMS value of a pure sine wave 10 DECIBELS Range 20 to 10 dB 8 to 22 dB 0 to 30 dB 6 to 36 dB 20 to 50 dB Reference Level With zero dB power level equal to 1 mW across a 6000 line 11 BATTERIES Voltage 1 54 9V NEDA No 13F 1604 12 FUSE F1 1A 250V type 3AG quick acting Littlefuse Type 312001 F2 2A 600V Littlefuse Type BLS or 2A 600V Bussman Type BBS 13 TESTLEADS 1 red 1 black 48 long 14 SIZE 5 1 2 x 7 x 3 1 8 13 34 x 17 78 x 7 94 cm 1 9 15 WEIGHT 3 Ibs 1 359 kg 16 RATED CIRCUIT TO GROUND VOLTAGE 1000V AC DC Max Per ANSI C 39 5 April 1974 The specified voltage with respect to ground which may be safely and continuously applied to the circuit of an Instrument Definition of Accuracy The voltage and current accuracy of this Instrument is commonly expressed as a percent of full scale This should not be confused
30. ommonly recognized safe prac tices to adopt and specific hazards to be avoided and are not implied to be sufficient to safeguard untrained personnel in all circumstances Neither is this manual a substitute for technical manuals covering the equipment in which mea surements are to be made Always refer to the equipment manual and its specific warnings and instructions and observe them as well as those contained herein a The 260 8 should only be used by personnel qualified to recognize shock hazards and who are trained in the safety precautions required to avoid possible injury b Do not connect any terminal of this Instrument to a circuit point at which a voltage exceeding 1000 volts AC or DC may exist with respect to earth ground Refer to Table 1 1 item 16 c Turn off power and discharge any capacitors in the circuit to be measured before connecting to or disconnecting from it d Before using this Instrument check accessories if any and test leads for missing damaged deteriorated or otherwise faulty insulating parts Do not use or permit the use of equipment with faulty insulation until it has been properly repaired e Always wear safety glasses when working in electrical circuitry f Do not work alone on high voltage circuits Make certain that someone capable of giving aid is alert and located nearby g Do not handle the Instrument its test leads or the circuitry while high voltage is being applied h Hands shoes flo
31. or and workbench must be dry Avoid making measure ments under humid damp or other environmental conditions that could effect the dielectric withstanding voltage of the test leads or Instrument i Do not change switch settings or test lead connections while taking mea surements A mistake could result in damage to the Instrument and possible personal injury 14 4 2 4 3 4 4 j Locate all voltage sources and accessible current paths before making con nections to circuitry High voltage may appear unexpectedly or in unexpected locations in faulty equipment An open bleeder resistor for example may result in a capacitor retaining a dangerous charge k Make certain that the equipment being worked on is properly grounded and fuses are the proper type and rating I Double check switch positions and jack connections before applying power to the Instrument m Remain alert for low voltage circuits which may be floating at high voltage with respect to earth ground and for composite voltages AC DC such as are found in r f amplifiers The floating voltage or composite voltage must not exceed the Instrument s rated maximum circuit to ground voltage n Do not make electrical measurements where the air may contain explosive concentrations of gas or dust such as in mines grain elevators gasoline stations or in the presence of charging batteries until determined to be safe by qualified personnel Note that even metallic dusts can be ex
32. plosive o No General Purpose VOM is to be used to make electrical measurements on blasting circuits or blasting caps Use only VOMs designed for this purpose Polarity Reversing The function switch conveniently reverses polarity of the internal battery to facili tate testing semiconductor devices The DC and DC positions transpose inter nal connections to the COMMON and jacks and therefore can also be used to reverse polarity of external voltages and currents connected to these jacks only Because polarity reversing momentarily interrupts the circuit it should not be done while measuring current or voltage without first turning off the circuit power When making measurements on the 50mA 250mV 1 volt or 10 amp range po larity can be corrected only by reversing the test leads Measurement of Unknown Voltage or Current The approximate voltage or current to be measured is sometimes known and the correct range can easily be selected However particularly when working upon faulty equipment the voltage or current can either be unknown or higher than normal or anticipated When working upon unfamiliar or unknown equipment always begin a measurement using the highest range available on the Instru ment Once it is determined that the voltage is within the limits of a lower range change to the lower range Test Leads Test leads are provided with accessory screw on alligator clips which may be attached to the probe tips Eliminating
33. priate factor from the chart below 0 2 5V 20 to 10 read directly 0 25V 0 to 30 add 20dB to reading 0 10V 8 to 22 add 12 dB to reading 0 50V 6 to 36 add 26 dB to reading 0 250V 20 to 50 add 40dB to reading NOTE The maximum voltage ratio that can be measured is 50 dB on the 0 250V range e 4 15 e If dB measurements are being made to a 0 006 watt into 500 ohm reference level subtract 7 dB from the reading obtained on the 260 Direct Current Measurement A Do not change the range setting of the range or function switches while the circuit is energized Never disconnect test leads from the circuit under measurement while it is energized Always turn the power off and discharge all the capacitors before the setting of the switches is changed or the leads disconnected Never exceed the circuit to ground voltage of the instrument 1000 v max table 1 1 item 16 Always connect the instrument in series with the grounded side of the circuit In all direct current measurements make certain the power to the circuit being tested has been turned off before connecting and disconnecting test leads or restoring circuit continuity Direct Current Measurement 0 50uA Range Set the function switch at DC Plug the black test lead into the COMMON jack and the red test lead into the 50uAMPS 250mV jack Set the range switch at 50UAMPS dual position with 50V Open the grounded side of the circuit in wh
34. s been subject to misuse negligence or accident incorrect wiring by others or installation or use not in accord with instructions furnished by the manufacturer 2609 is a Registered Trademark of the Simpson Electric Co 2 NOTES Contents Ti INTRODUCTION hast ra ga 7 1 1 General Description riisiin raae o a N ai 7 1 2 Overload Protection msrnonvnnonrnnnrnnnnrnnnvnnrnrenrvnnnnvnnvannnnvnnsnrsenvnsenenenen 7 1 3 Internal Batteries vcd ia 7 TA Printed Gireult 2 23 ac EARE 8 1 5 AA hanne daud rene danene 8 1 6 Adjust A Vue Handle nuuersnsnenssnnnnnsnnnnnnnnnnnnnnnnnnnnennnnnnnnnnnnnennnennrnnnn 8 17 Testkeads unan ae eine ee a te N 8 1 8 Technical D t unir league aan PA PEEN A E intake 8 1 9 Definition of Accuracy rianaire a a ea 10 1 10 Safety Considerations rrronrnnnnvnnnvrnnnvrnnnrnrnvrnrnrnnrnrnnnvnnenrenennnsnnenen 10 1 11 Accessory AC High Voltage Probe rrnnnnrnnnvnnnvnnnnrnnnvnnenrnnnvrnenrnennnn 11 1 12 Amp clamp Model 150 2 uuuussnessssnenenennnnnnnnnnnnnnnnennnnnnnnnnnennnnnnr nenn 11 2 INSTALLATION a 2a sanactoecdasdecenteddaadeaaneedcatagacnedeed 11 2 1 Unpacking and Inspection u zununersneersennnnnennnennnnnnnnnnnnen ernennen 11 222 Wa rranty EEA street iacteced esas d agsehsersicedpadicsuaeiirasaetan 11 2 3 Power Source Requirements usserssnnsneensnnnnnnensnnnnnennnnnnnnnnnnnn 12 2 4 Operating Position reellen 12 3 CONTROLS JACKS AND INDICATORS
35. s misused The 260 8 has been designed to afford maximum instrument protection under overload condi tions which might occur within the measuring capabilities of the Instrument how ever the operator must exercise care to avoid severe overloads particularly when working in high voltage circuits Basic overload protection is provided by a small inexpensive and easily obtain able 3 AG type 1 Amp quick blow fuse This fuse is rated to interrupt circuit voltages up to 250 V For maximum protection it is important to replace the 1A fuse with the Littlefuse type 312001 only A supplemental high energy fuse is provided for additional protection from se vere overloads This fuse is rated for an interruption capacity of 10 000 Amps up to 600 V Littlefuse Type BLS or Bussman Type BBS If the Instrument fails to indicate a reading the 1 Amp or the 2 Amp fuse 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 Two diodes connected across the meter movement affords protection to the move ment by circumventing excessive current around the movement in the event of an overload Internal Batteries There are two batteries in the ohmmeter circuits a NEDA 13F size D cell that furnishes 1 5 volts for the R X 1 and R X 100 ranges and a NE
36. wait for the meter indication to reach zero and then interchange test lead connections to the circuit 4 16 Resistance Measurements AN Voltage applied to a resistance range will cause reading errors if low and dam age the Instrument if high When making in circuit measurements make certain that the circuit is completely de energized before making connections to it When making in circuit measurements circuit paths in parallel with the resis tance being measured may cause reading errors Check circuit diagrams for the presence of such components before assuming that the reading obtained is correct When resistance is measured the batteries furnish power for the circuit Since batteries are subject to variation in voltage and internal resistance the Instru ment must be adjusted to zero before measuring a resistance 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 jack c Connect the ends of test leads together to short the VOM resistance circuit d Rotate the ZERO OHMS control until pointer indicates zero ohms If pointer cannot be adjusted to zero one or both of the batteries must be replaced For battery replacement refer to Section 5 e Disconnect shorted test leads 4 16 1 Measuring Resistance a Before measuring resistance in a circuit make sure the power is off to the circuit being tested and all capacitors are dischar
37. with accuracy of reading indi cation For example 2 of full scale on the 10 volt range allows an error of 0 20V at any point on the dial This means that at full scale the accuracy reading would be 2 but at half scale it would be 4 Therefore it is advantageous to select a range which gives an indication as near as possible to full scale 1 10 Safety Considerations This Operator s Manual contains cautions and warnings alerting the user to haz ardous operating and service conditions This information is flagged by CAU TION or WARNING symbols throughout the publication where applicable and is defined on the inside front cover of the manual under NOTES AND SAFETY INFORMATION Adhere to these instructions in order to ensure the safety of operating and servicing personnel and to retain the operating conditions of the Instrument TABLE 1 2 ltems and Accessories Furnished with this Instrument Quantity Description Catalog No 1 Test Lead Set one red and one black 48 long each with combination probe tip and removable rubber sleeved alligator clip 00043 1 1 5 Volt D Cell NEDA 13F 1 9 0 Volt Cell NEDA 1604 2 1 Amp 250V Fuse Littlefuse Type 312001 1 2A 600V Fuse Littlefuse Type BLS or Bussman Type BBS 1 Operator s Manual 6 114338 Batteries are standard items replaceable from retail stores TABLE 1 3 Additional Accessories Description Catalog Number Deluxe Gases ae an innen 00812 Leatherette Ever Red
38. y Hard Case Drop Front rrrnenrnnnvrnonrnnnvnnenrernn 00805 Model 150 2 Amp Clamp eronrnnnrnnrnronnnnnnnrnnrnrnnnnnnrnrennvenvnnnensnnrnnnnnrene 00545 Model 151 2 Line Splitter srnnrnrnnrvrnnnvnnnrrnenrnnnnrnrnronnnnnnnrnnrnnnnnvnnnnnnen 00544 10 1 11 Accessory AC High Voltage Probe The 10 000 V AG high voltage probe extends the 260 8 AC voltage range The probe can be used with the Simpson 260 8 10 volt AC range NOTE Instructions are furnished with each high voltage probe 1 12 Amp clamp Model 150 2 2 1 2 2 The Simpson Amp Clamp Model 150 2 allows AC current measurements with out breaking the circuit under test The Amp Clamp works as a transformer con taining a split core for accommodating the conductor which carries the current being measured The current carrying conductor becomes the transformer pri mary and a coil in the Amp Clamp serves as the secondary winding The Amp Clamp output voltage is proportional to the current measured and can be applied to the 260 8 as an AC voltage The Amp Clamp has a range selector with 6 positions Any of the following current ranges can be used with the 260 8 5 10 25 50 100 or 250 amperes NOTE Instructions are furnished with each Amp Clamp INSTALLATION This section contains information and instructions for the installation and ship ping of the Simpson 260 8 Included are unpacking and inspection procedures warranty shipping power source requirements
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