Simpson 260® Series 8XI Volt-Ohm-Milliammeter
Contents
1. Simpson 260 Series 8XI Volt Ohm Milliammeter 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 headings 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 Warning Refer to accompanying documents AN Caution risk of electric shock This instrument is designed to prevent accidental shock to the operator when properly used However no engineering design can render safe an instrument whick is used carelessly Therefore this manual must be read carefully and com pletely before making any measurements Failure to follow directions can result in ser ious or fatal accident Shock Hazard As defined in American National Standard C39 5 Safety Requrements for Electrical and Electronic Measuring and Controlling Instrumen tation a shock hazard shall be considered to exist at any part involving a poten tial in excess of 30 volts RMS sine wave or 42 4 volts DC or peak and where a leakage current2. 1 7 Test Leads Each Instrument is furnished with one pair Catalog No 00125 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 s 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 amps Do not exceed these ratings for the test leads in any application 1 8 Technical Data Table 1 1 Technical Data 1 DCVOLTS Ranges 0 1 2 5 10 25 50 250 500 1000V Sensitivity 20 000V per Volt 2 DC MILLIVOLTS Range 0 250mV Sensitivity 20 000 per Volt 3 ACVOLTS Ranges 0 2 5 10 25 50 250 500 1000V Sensitivity 5 000V per Volt 4 OUTPUT VOLTAGE AG Ranges 0 2 5 10 25 50 250 limited to 350V DC 5 DC MICROAMPERES Range 0 50uA Voltage Drop 250mV 8 6 DC MILLIAMPERES Ranges Voltage Drop Approx DC AMPERES Range Voltage Drop Approx 0 1 10 100 500 mA 250 mV 255 mV 300 mV 500 mV 0 10A 255 mV NOTE The 10A range is not internally fused Resistance Range Center Reading Nominal Open Nominal Sh
3. Read the output voltage on the ap propriate AC voltage scale For the 0 2 5V range read the value di rectly 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 im mediately above the scale Figure 4 9 Jacks and Switch Positions for Output Measurements Decibel Measurement 20 to 50 dB Certain industries measure in terms of voltage or current ratios decibels based on a specific reference level The dB scale on the 260 serves this purpose and is calibrated to a reference level zero dB of 0 001W into 6000 The scale calibra tion of 20 to 10 dB is for the 0 2 5V range zero dB 0 775V Higher ranges may be used by adding an appropriate dB value to the reading in accordance with the chart below Before proceeding with the following steps review the Safety Precautions in Paragraph 4 2 55 a Refer to Figure 4 10 for switch settings and jack connections b Use operating instructions for AC VOLTAGE MEASUREMENT 0 2 5V 10 25V 50V 250V RANGES Paragraph 4 10 NOTE Do not use the 500V or 1000V ranges for decibel readings c Read decibels on the bottom scale marked dB For the 10V 25V 50V 250V ranges add the appropriate factor from the chart below NOTE The maximum voltage ratio that can be measured is 50 dB on the 0 250V range d IfdB measurements are being made to a 0 006W into 5000 reference level subtract 7 dB from the reading obtained
4. Direct Current Set the function switch at DC Figure 4 11 Plug the black test lead into the COMMON jack and the red test lead into the jack Set the range switch at one of the four range positions marked 1 mA 10 mA 100 mA or 500 mA Open the grounded side of the circuit in which the cur rent is being measured Con nect 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 Turn the power on Read the current in milliamperes on the black DC scale For the 1 mA Figure 4 11 Jacks and Switch Positions range use the 0 10 figures for Measuring Direct Current and divide by 10 For the 10 mA range use the 0 10 figures directly For the 100mA range use the 0 10 figures and multiply by 10 For the 500 mA range use the 0 50 figures and multiply by 10 Turn the power off and disconnect the test leads 24 A This range is only intended for measurements in low voltage circuits under 25V DC such as the primary power in vehicles or their accessories 4 9 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 Set the range switch at 10 AMPS dual position with 10 mA Open the grounded side of the circuit in which the current is being measured Connect the VOM series with the circuit connecting the red test lead to the positive side and the black test lead to the negative s
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6. 4 1 2 indicating Instru ment Below the Instrument are three controls and seven circuit jacks Switch positions and circuit jacks are marked in black characters for easy reading This switch is used to select one of the twelve range positions Figure 3 1 Front Panel Controls Jacks and Indicators 3 Function Switch The function switch has four position Audio DG DC 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 signal applied across the test leads 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 internal ohmmeter battery voltage will be as marked at the jacks when the switch is in the DC position and reversed in the DC position To check circuit continuity set the func tion switch to the position 13 4 Zero Ohms This control is used to compensate for variations in the voltage of the internal batteries when making resistance measurements 5 Circuit Jacks There are seven jacks on the front panel marked with the functions they represent Figure 3 1 These jacks provide the electrical connections to the test leads The COMMON jack is used in conjunction with the black test lead as the reference point for the measurement of all the func tions with the exception of the 10A range 6 Pointer
7. Adjust For Zero With the Volt Ohm Milliammeter in an operating position check that the pointer indicates zero at the left end of the scale when there is no input If pointer is off zero adjust the screw located in the cover below the center of the dial Use a small screwdriver to turn the screw slowly clockwise or counterclockwise until the pointer is exactly over the zero mark at the left end of the scale With the indicating pointer set on the zero mark reverse the direction of the rotation of the zero adjuster slightly to introduce mechanical freedom or play but not enough to disturb the position of the indi cating pointer This procedure will avoid disturbances to the zero setting by subsequent changes in temperature humidity vibration and other environmental conditions 4 OPERATION This section of the manual contains information required to use and operate the Instrument in a safe and proper manner 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
8. and use the black figure immediately above the scale 4 7 2 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 AC Volts Only position and the test leads connected to COMMON and 500V jack Do not touch the Instrument or test leads while the power is on the circuit being measured Use extreme care when working in high voltage circuits Do not handle the Instru ment or test leads while the circuit being measured is energized Review all Safety Precautions in paragraph 4 2 and in the instruction manual for equipment being tested a Set the function switch at AC Volts Only position A When making AC voltage measure ments with the function switch incorrectly set to DC the Instrument pointer will re main at or near zero indicating a false no voltage present condition that could be hazardous BER AA Setthe range switch at 250V 500V 1000V position Plug the black test lead into the COMMON jack and the red test lead into the 500V jack Be sure the power is off in the cir cuit being measured and that all capacitors have been discharged gt e Connect the test leads across the Figure 4 6 Jacks and Switch Positions circuit voltage to be measured with for MeasuringAC Voltage 0 50
9. either higher or Figure 4 4 Frequency Response AC lower than the true RMS value Voltage ranges of the measured voltage Therefore an error may occur if the 260 is used to measure a nonsinusoidal waveform Also accuracy is lessened at higher input frequencies Figure 4 4 Before proceeding with the following steps review the Safety Precautions in Paragraph 4 2 4 7 1 AC Voltage Measurement 0 2 5 Through 0 250V Range a Set the function switch at AC Volts Only position NOTE The meter will not indicate if the switch is incorrectly set to a DC position 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 Instrument If the voltage is within a lower range the switch may be set for PERCENT RELATIVE ERROR Figure 4 5 Jacks and Switch positions for measuring AC Voltages 0 2 5 through 0 250V Ranges the lower range to obtain a more accurate reading Plug the black test lead into the COMMON jack and the red test lead into the jack d Turn off power to the circuit being measured and discharge all capacitors e Connect the test leads across the circuit voltage to be measured with the black lead to the grounded side f For the 2 5V range read the value directly on the scale marked 2 5 VAC For the 10V 25V 50V and 250V ranges read the red scale marked AC
10. live circuits 5 1 Battery and Fuse Replacement 1 The batteries and 1 Amp fuse are located inside an isolated compartment at the top rear of the Instrument case Open the compartment as follows a Place the Instrument face down on soft padded surface b Unscrew the single screw on the cover Remove the cover from the case and set aside Batteries and fuse can now be replaced NOTE If replacement of the 2 AMP high current interrupting fuse is necessary the instrument case must be removed see paragraph 5 3 Battery replacement is necessary whenever the instrument cannot be adjusted to infinity ee with open test leads on the Lower Power Ohmmeter ranges or with shorted test leads on the conventional ohmmeter ranges If these adjustments cannot be made replace the 1 5V D size cell If the ohms adjustment cannot be made on the RX 10K range replace the 9V battery 2 Replace the D size cell as follows a Remove the D size cell b Grasp the battery at the center and pull directly up c Insert the new cell end first while pushing against the terminal spring clip d Gently push the side of the cell into place 3 To remove the 9V battery a Remove the battery with the mating connector from the compartment b Take the connector off the old battery and connect it to the new battery c Insert new battery into the compartment d Place the connector leads so they rest between the cavity walls and clear the
11. scale reads from right to left for increasing values of resis tance To determine the actual resistance value multiply the reading by the factor at the switch position K on the OHMS scale equals one thousand e 4 12 Resistance Measurement of Semiconductors AN Make sure that the OHMS range being used will not damage any of the semicon ductors refer to table 1 1 item 8 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 forward and reverse bias resis 26 tance measurements consider the following before making measurement a 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 If the semiconductor is a silicon diode or conventional silicon transistor no precautions are normally required If the semiconductor material is germanium check the ratings of the device and refer to Table 1
12. 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 One is a NEDA 13F size D cell that furnishes 1 5 volts for the RX 1 and R X 100 ranges NEDA 1604A alkaline battery 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 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 15 Case The case has an externally accessible battery and fuse compartment Access to the batteries and 1 amp fuse is obtained by unscrewing a single screw on the back of the case and sliding out the compartment cover 1 6 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 is preferable for greater accuracy since the Instrument is calibrated in this position
13. 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 3 16 4 6 2 4 6 3 DC Voltage Measurement 0 2 5 Through 0 250V Range 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 jack Set the range switch at one of the five voltage range positions marked 2 5V 10V 25V 50V or 250V A When in doubt as to the highest voltage present always use the highest voltage range as a protection to the Instrument If the voltage is within 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 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 Turn on the power in the circuit be ing Measured Read the voltage on the black scale marked DC For the 2 5V range use the 0 250 figures and divide by 100 For the 10V 50V and 250V ranges read the figures directly For the 25V range use the 0 250 figures and divide by 10 Turn off power to the circuit and wait until the meter indicates zero be fore disconnecting the test leads Figure 4 1 Jacks and Switch Positions for Measuring DC Voltages 0 250V Ranges DC Voltage Measurement 0 500V Range Use extreme care w
14. 0V the black lead to the grounded side Range E ra ES mean if any f Turn on 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 20 4 7 4 7 3 AC Voltage Measurement 0 1000 Range A Use extreme care when working in high voltage circuits Do not handle the Instru ment or test leads while the circuit being measured is energized OBSERVE ALL SAFETY PRECAUTIONS in paragraph 4 2 and in the instruction manual for the equipment being tested Do not attempt any voltage measure ment which may exceed 1000V or the circuit to ground voltage of the instru ment 1000V max 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 jack Do not touch the instrument or test leads while the power is on in the circuit be ing Measured a Set the function switch at AC b Setthe range switch at 250V 500V 1000V position Plug the black test led into the COMMON jack and the red test lead in the 1000V jack d Be sure the power is off in the cir cuit being measured and that all capacitors are discharged e Connect the test leads across the circuit voltage to be measured with the black lead to the 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 10 fi
15. 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 Turn off all power to the circuit under test before proceeding any further 4 13 Continuity Tests a Setthe FUNCTION switch to the A Insert the black test lead into the COMMON and the red test lead into the jacks Figure 4 13 b Touching the test lead probe tips together should produce sound To test for continuity probe the cir cuit or component in question An audible sound indicates continuity d The higher the circuit s resistance the lower the sound level The lower the circuit s resistance the higher the sound level e Refer to paragraph 4 20 Figure 4 12 for measurements of circuit re sistance if any that exists Figure 4 13 Jacks and Switch Positions for Continuity Tests 27 5 OPERATOR SERVICING This Instrument has been carefully designed and constructed with high quality components By providing reasonable care and following the instructions in this manual the user can expect a long service life of the Instrument Prior to opening the battery compartment cover disconnect the test leads from
16. 5 Rheostat 3 kQ 6 111488 R2A Resistor 2 2 5 118606 R3 Resistor 0250 6 111575 R4 Resistor 45 kQ 1 114192 R5 Resistor 150 kQ 1 113366 R6 Resistor 300 kQ 5 116808 R7 Resistor 500 kQ 1 114090 R8 Resistor 4 1 113362 R9 Resistor 11 25 6 114332 R9A Resistor 3 75 6 114331 R10 Resistor 3 75MQ 1 115765 R10A Resistor 1 25 MO 6 114333 30 Reference Symbol R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R23 R24 R26 R27 R28 R29 R30 C1 D1 D2 Fi F2 Description Part Number Resistor 15 Resistor 0 480 SW wire wound Resistor 20 5W wire wound Resistor 22 50V 3W wire wound Resistor 2380 Resistor 110 5W wire wound Resistor 1 095 kQ Resistor 1380 Resistor 17 320 kQ Resistor 113 860 Potentiometer 11 25 Resistor 4 Resistor 7 5 Resistor 37 5 Resistor 75 kQ Resistor 125 Resistor 1MQ Capacitor 0 1 uF 400V Diode Germanium Fuse 1A 250V 3AG 1 1 4 x 1 4 Quick acting Littlefuse Type 312001 Fuse 2A 600V Littlefuse Type BLS or 2A 500V Bussman Type BBS For Function Switch Knobs For Zero Ohms Adjust For Range Switch Case Assembly Complete Including Handle less Battery Compartment Cover Battery Compartment Cover Assembly Cover Assembly for indicating Instrument Probe Tip Leads 1 red amp 1 black Audio Transducer 31 1 113347 6 114537 5 115271 1 112507 1 115789 1
17. Figure 4 10 Jacks and Switch Positions for Measuring Decibels 4 9 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 changing the 23 switch settings or disconnecting the leads Never exceed the circuit to ground voltage of the instrument 1000V Max Table 1 1 Item 16 Always connect the instrument in series with the ground 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 4 9 1 a b e Direct Current Measurement 0 50 Range Set the functions 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 which 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 3 4 9 2 Measurement 0 1mA through 0 500mA Range a b
18. RS 3 1 Front Panel Description srrrrnnvnnnvnvonnvnvrerrnnrnnrrvrnnnrnrarrrnrrerenvnneen OPERATION a neh 4 2 Safety Precautions aisis aiot a aa 4 3 Polarity Reversing 4 4480 4 4 Measurement of Unknown Voltage or Current 4 5 REE EG JE EE eee 4 6 Voltage 4 6 1 DC Voltage Measurement 0 250 mV Range 4 6 2 DC Voltage Measurement 0 2 5 Through 0 250V Range 4 6 3 DC Voltage Measurement 0 500V Range 4 6 4 DC Voltage Measurement 0 1000V Range 4 7 Voltage Measurement 4 7 1 Voltage Measurement 0 2 5 Through 0 250V Range sh 4 7 2 Voltage Measurement 0 500V 4 7 3 AC Voltage Measurement 0 1000 Range 4 7 Output Voltage 4 8 Decibel Measurement 20 to 50 dB 4 9 Direct Current Measurement 4 9 1 Direct Current Measurement 0 50uA Range 4 9 2 Direct Current Measurement 0 1mA through 0 500mA Range 24 4 9 3 Direct Current Measurement 0 10A Range 25 4 10 Zero Ohms Adjustment 25 4 11 Measuri
19. ated When working upon unfamiliar or unknown equip ment always begin a measurement using the highest range available on the Instrument Once it is determined that the voltage is within the limits of a lower range change to the lower range Test Leads These are provided with accessory screw on alligator clips which may be at tached to the probe tips As well as eliminating the need to hand hold test prods to a circuit for extended periods the test clips reduce hand proximity to a high voltage circuit while energized Circuit power must be turned off and any charged capacitors discharged before connecting or disconnecting clips to or from the current DC Voltage Measurement A Before measuring voltage review the SAFETY PRECAUTIONS listed in para graph 4 2 Also when using the 260 as a millivoltmeter care must be taken to prevent damage to the indication instrument from excessive voltage Before us ing the 250 millivolt range use the 2 5V DC range to determine that the voltage measured is not greater than 250mV or 25V DC 1 DC Voltage Measurement 0 250 mV Range a Set the function switch at DC Figure 4 1 b Plug the black test lead in the COMMON jack and the red test lead into the 50 uAmps 250mV 10A jack Set the range switch at 50 Amps COMMON position with 50V 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
20. 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 4 2 Safety Precautions The following precautions are suggestions and reminders of commonly recog nized safe practices as well aspecific hazards to be avoided and are not implied to be sufficient enough to ensure the safety of untrained personnel in all circum stances Neither is this manual a substitute for technical manuals covering the equipment being measured Always refer to the equipment manual and its spe 14 cific warnings and instructions and observe them as well as those contained herein a The Instrument 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 voltage exceeding 1000V AC or DC may exist with respect to earth ground Refer to Table 1 1 item 16 Turn off power and discharge all capacitors in the circuit to be measured before connecting to or disconnecting from it Before using this Instrument check accessories if any and check test leads for missing damaged deteriorated or otherwise faulty insulating parts Do not
21. e nor even a combination of devices as found in the 260 can fully protect a multi purpose Instrument under all overload conditions Despite all the built in protection provided overloads severe enough to damage the Instrument are possible when the Instrument is misused The fuse in the 260 affords maximum Instrument protection under overload con ditions which might occur within the measuring capabilities of the Instrument however 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 ampere quick blow fuse This fuse is rated to interrupt circuit voltages up to 250 volts 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 amperes up to 600 volts 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 2 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 shunt connects directly to the 10A and 10A jacks Two diodes connected across the meter movement affords protection
22. ed test lead into the 1000V jack d Be sure power is off in the cir cuit being measured and all ca pacitors discharged Connect the black test lead to the nega tive side of the circuit being measured and the red test lead to the positive side of the circuit e Turn on power in circuit being measured f Read the voltage using the 0 10 figures on the black scale marked DC Multiply the read ing by 100 g Turn off power to the circuit anc wait until the meter indicates zero before disconnecting the test leads 18 E 1 O O TS Figure 4 3 Jacks and Switch Positions for Measuring DC Voltage 1000V Range 4 7 Voltage Measurement A Branch and distribution circuits 120 240 480V etc can de AC VOLTAGE RANGES i 2 5 RANGE liver dangerous explosive TOVAG RANGE power momentarily into a short 50 VAC RANGE 250 VAC RANGE 500 VAC RANGE _ 1000 VAC RANGE circuit before the fuse breaker opens the circuit Make certain that the instrument switches are set properly jacks are con nected properly and that the circuit power is turned off be fore making connections to such circuits Refer to Para graph 4 7 d The 260 responds to the aver age 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 10Hz 100Hz 1 2 10KHz 100 2 1MHz depending on its waveform the FREQUENGY reading may be
23. el To aid in troubleshoot ing a schematic diagram is shown on page 32 The replacement parts list Table 6 1 describes the components and refers to Simpson part numbers Reference Symbol numbers correlate the components shown on the schematic diagram with the parts list A Improper or makeshift repairs and or parts substitutions may be dangerous to the next user Replacement parts must have mechanical and electrical characteris tics identical to the original parts The following information is provided as an adjunct to the overall text contained in this manual and should be read and understood thoroughly before ordering replacement parts for the instrument Removing the Instrument Case To gain access to the inside of the Instrument panel 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 leading to the battery com partment are seated in their respective slots within the compartment wall This will prevent damage to the wire insulation Replacement Parts and Schematic Diagram To obtain replacement parts address order to the nearest Authorized Service Center Refer to paragraph 2 3 1 for ordering instructions Table 6 1 Replacement Parts Reference Symbol Description Part Number Ri Rheostat 150 6 111487 RIA Resistor 20 5 119705 R2 R22 Rheostat 3 6 111488 R2
24. from that part to ground exceeds 0 5 milliampere when mea sured with an appropriate measuring instrument defined in Section 11 6 1 of ANSI 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 o
25. full scale This should not be confused with accuracy of reading indi cation For example 2 of full scale on the 10V 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 the closest indication 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 CAUTION or WARNING symbols where applicable throughout this publication and is de fined on the inside front cover of this manual under Notes and Safety Information Adhere to these instruction in order to ensure the safety of operating and servic ing personnel and to retain the operating conditions of the Instrument 1 11 Audio Alarm The 260 Audio Alarm transducer will emit an audio sound when the continuity of a circuit being tested is completed No circuit continuity tests are to be made with electrical power ON Turn OFF all electrical power 1 12 Accessories Table 1 2 ltems and Accessories Furnished with this Instrument Quantity Description Number 1 Test Lead Set one red and one black 48 long 00125 each with combination probe tip and removable rubber sleeved alligator clip 1 1 5 Volt D Cell NEDA 13F 1 9 0 Volt Cell NEDA 1604A 2 1 Amp 250V Fuse Litt
26. fuse terminals The extended leads are placed between the battery holder and the top wall of the case NOTE One ampere and two ampere fuse replacement is necessary when there is no meter deflection on any of the DC AC Volts or Ohms ranges but the DC Amps range operates properly 4 Replace the 1 Amp fuse is as follows a Pull the defective fuse from its retaining spring clips b Snap in the replacement fuse and replace cover NOTE A spare fuse is located in a cavity next to the fuse clip Use only if proper replacement is not available save the internal spare for an emergency 28 5 2 5 3 Fuse Protection 1 250V quick acting fuse and 2A high voltage high interruption capac ity fuse is connected in series with the input circuit as additional protection to the VOM against excessive energy fault current such as a power line overload It is important to replace the 1 Amp fuse with a Littlefuse Type 312001 only to prevent the 2 Amp high interruption capacity fuse from opening on a nominally high overload If the Instrument fails to indicate the 1 Amp or 2 Amp fuses may be burned out Refer to Paragraph 5 2 for fuse replacement A 1 Amp spare fuse is furnished with each instrument Both 1 Amp fuses are located in the battery and fuse compartment The 2 Amp fuse is located on the instrument panel under the printed circuit board a Do not attempt to clean this instrument with test leads connected to a power so
27. gures and multiply by 100 Figure 4 7 Jacks and Switch Positions for Measuring AC Voltage 0 1000V Range Output Voltage Measurement The following steps instruct how to measure the AC component of an Output Voltage where both AC and DC voltage levels exist This occurs primarily in amplifier circuits A 0 1 mfd 400V capacitor in series with the OUTPUT jack blocks the DC component of the current in the test circuit but allows the AC or desired component to pass on to the indicating instrument circuit The blocking capacitor may alter the AC response at low frequencies but is usually ignored at audio frequencies Figure 4 8 Do not connect the OUTPUT jack to a circuit in which the DC voltage component exceeds 350V 21 4 8 Before proceeding with the following steps review the Safety Precautions in Para graph 4 2 10 OUTPUT RANGES 8 2 5 VAC RANGE 10VAC RANGE 5 50 VAC RANGE 250 VAC RANGE Figure 4 8 Frequency Response Output Ranges PERCENT RELATIVE ERROR 108 10Hz 100Hz 1KHz 10KHz 100KHz 1MHz FREQUENCY a Set the function switch at AC Volts Only position Figure 4 9 b Plug the black test lead into the COMMON jack and the red test lead into the OUTPUT jack Set the range switch at one of the range positions marked 2 5V 10V 25V 50V or 250V d Connect the test leads across the circuit being measured with the black test lead to the grounded side e Turn onthe power in the test circuit
28. hen 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 2 a b Set the function switch at DC Figure 4 2 Set the range switch at the 250V 500V 1000V position Plug the black test lead into the COMMON jack and the red test lead into the 500V jack Be sure power is off in the circuit being measured and all capacitors dis charged 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 17 e Turn on power in circuit being measured f Read the voltage using the 0 50 figures on the black scale marked DG Multiply the reading by 10 g Turn off power to the circuit and wait until the meter indicates zero before disconnecting the test leads Figure 4 2 Jacks and Switch Positions for Measuring DC Voltage 0 250 Ranges 4 6 4 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 2 a Set the function switch at DC Figure 4 3 b Set the range switch at the 250V 500V 1000V position Plug the black test lead into the COMMON jack and the r
29. ide 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 e Turn the power off and disconnect the test leads oy The 10A range is not internally fused in the 260 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 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 incorrect turn off circuit power wait for the meter indicator to reach zero and then interchange test lead connections to the circuit 4 10 Zero Ohms Adjustment A Voltage applied to a resistance range will cause reading errors if low and dam age to the Instrument if high When making in circuit measurements make cer tain 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 INTERNAL batteries B1 and B2 furnish power for the circuit Since batteries are subject
30. lefuse Type 312001 1 2A 600V Fuse Littlefuse Type BLS or Bussman Type BBS 1 Operator s Manual 6 115021 Batteries are standard items replaceable at local retail stores 10 1 13 Additional Accessories Table 1 3 Additional Accessories Description Catalog No Deluxe a Seii n anemi 00812 VinylSheath aE 01818 Leatherette Ever Redy Hard Case Drop 00805 5 000 Volt AC Probe 5 00794 5 000 Volt DC Probe 20 KONV 2 00795 10 000 Volt AC Probe 5 KO V 00036 10 000 Volt DC Probe 20 00034 Model 150 2 Amp Clamp rvonnnrnorvnnvnrnnnvnnenvnnnrnnenrnnnnrnenrenennnnnrnnsnrennnnnenre 00541 Model 151 2 Line 00544 High voltage probes and test prod adapters provide a convenient and economi cal means of extending the voltage range of the 260 They are intended for high voltage measurements in low power consumer type products such as TV receiv ers oscilloscopes burner ignition systems etc They are NOT intended for and should NOT be used for measurements in high power circuitry such as power substations or distribution centers RF induction heaters or broadcast transmit ters x ray equipment or other applications where an operator error may create a dangerous condition 1 13 1 Accessory DC High Voltage Probe
31. ng 26 4 12 Resistance Measurement of 1 26 4 19 Continuity Tests naaa pide ja 27 Contents Continued OPERATOR SERVICING 2 28 5 1 Battery and Fuse 28 5 2 FUSE Protection 29 533 set an ret eae ee 29 PARTS LIST AND SCHEMATIC 30 6 1 Removing the Instrument Case 30 6 2 Replacement Parts and Schematic Diagram 30 NOTES 1 11 1 2 1 3 INTRODUCTION General Description The Simpson Volt Ohm Milliammeter 260 Series 8XI 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 are 0 25V AC DC Range Continuity Test Alarm Individual Dual Jacks for the 500V AC DC and 1000V AC DC Ranges High Impact Case Yellow Overload Protection No single protective devic
32. ns for the installation and ship ping of the Instrument Included are unpacking and inspection procedures war ranty shipping power source requirements and operating position 2 1 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 the 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 perfor mance as soon as possible Check that all tems are included with the Instrument Refer to Table 1 2 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 alligator clips for the test leads are in a polyethylene bag See Section 5 for instructions on how to install the batteries 22 Warranty The Simpson Electric Company warranty policy is printed on the inside front cover of this manual Read carefully before requesting warranty repairs For all assistance contact the nearest Authorized Service Center or the factory directly Give full details of any installation difficulties 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 n
33. ort ES RX100 RX1000 0 20000 0 200 0000 0 20 0 12000 120 0000 Circuit Current 125mA 1 25mA 75uA ACCURACY DC Voltage Ranges DC Current 0 50 yA Range Other Ranges AC Voltage Ranges Frequency Response Resistance Ranges RX1 R X 100 R X 10 000 DECIBELS Range Reference Level BATTERIES Voltage NEDA No FUSE TESTLEADS SIZE 2 of Full Scale 1 5 of Full Scale 2 of Full Scale 3 of Full Scale Referenced to 100 Hz Figures 4 4 and 4 8 2 5 of Arc 2 of Arc 2 of Arc 20 to 10 dB 8 to 22 dB O to 30 dB 6 to 36 dB 20 to 50 dB With zero dB power level equal to 1 mW across a 600V line 1 5V 9V 13F 1604A F1 1A 250V type 3AG quick acting Littlefuse Type 312001 F2 2A 600V Littlefuse Type BLS or 2A 600V BussmanType BBS 1 red 1 black 48 long 5 1 4 x 7 x 3 1 8 13 34 x 17 78 x 7 94 cm 15 WEIGHT 2 1 2 lbs 0 9331 kg 16 RATED CIRCUIT TO GROUND VOLTAGE 1000 V AC DC Max 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 Per ANSI C39 5 April 1974 The specified voltage with respect to ground which may be safely and continuously applied to the circuit of an Instrument 19 Definition of Accuracy The voltage and current accuracy of this Instrument is commonly expressed as a percent of
34. ot be exceeded without prior approval 2 3 Shipping Pack the Instrument carefully and ship it prepaid and insured to the proper destination 2 4 Power Source Requirements There are two batteries in the ohmmeter circuits One is a NEDA 13F D size cell that furnishes 1 5 volts for the R X 1 and R X 100 ranges A NEDA 1604A battery 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 5 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 is preferable for greater accuracy since the Instrument is cali brated in this position 12 3 3 1 CONTROLS JACKS AND INDICATORS Front Panel Description All operating and adjustment controls jacks and indicators for the Instrument are illustrated in this section along with a list Table 3 1 describing their function Become familiar with each item before operating the Instrument Table 3 1 Controls Jacks and Indicators 1 Front Panel 2 Range Switch The 260 is a large easy to read
35. r authorized service centers nor which has been subject to misuse negligence or accident incorrect wiring by others or installation or use not in accord with instructions furnished by the manufacturer 260 is a Registered Trademark of the Simpson Electric Company 2 NOTES Contents INTRODUCTION Eee Men a ike 1 1 General 1 2 Overload 1 3 Internal Batteries ooomoocccnnnnniccccnnnnconcccnnnnnnncccncnnnnnnccnnnnnnnnnnncnnnnnns 1 4 Printed Circuit o les atadas ida A bd 1 6 Adjust A Vue Handle 1 7 Testeado era 1 8 Technical Data ceda 1 9 Definition Of Accuracy cccoooccccnoncccnnnancnonnnnnnnnnnnnn cnn raro 1 10 Safety Considerations 1 11 Audio Alar coc eee AN A NEO 1 13 Additional Accessories 1 13 1 Accessory DC High Voltage Probes 1 13 2 Accessory AC High Voltage Probe 1 13 3 Amp Clamp Model 150 2 INSTALLATION ernten 2 1 Unpacking and Inspection 2 2 Wade cata etn GE 2133 SHIPPING sun budene fe 2 4 Power Source 2 5 Operating PoSition cialis CONTROLS JACKS AND INDICATO
36. s The DC high voltage probes are designed for use with the Simpson 260 or any 20 000 ohms per volt VOM having a 2 5 volt DC range and scale graduations from 0 10 or multiple thereof for the 10 kV probe Accuracy Probe Resistance 2 DC high voltage test probes are available at local electronic parts distributors 1 13 2 Accessory AC High Voltage Probe The 10 000 volts AC accessory probe is similar to the high voltage DC probes with the following exceptions The AC high voltage probe is designed to extend the 260 8 AC voltage range The probe can be used with the Simpson 260 10 volt AC range NOTE Instructions are furnished with each high voltage probe 1 13 3 Amp Clamp Model 150 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 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 as an AC voltage The Amp Clamp has a range selector with 6 positions Any of the following cur rent ranges can be used with the 260 5 10 25 50 100 or 250 amperes NOTE Instructions are furnished with each Amp Clamp 11 2 INSTALLATION This section contains information and instructio
37. tage must not exceed the Instrument s rated maximum circuit to ground voltage 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 explosive No General Purpose VOM is to be used to make electrical measurements on blasting circuits or blasting caps 15 4 3 4 4 4 5 4 6 4 6 Polarity Reversing The function switch provides a convenient means to reverse polarity of the inter nal battery to facilitate testing semiconductor devices The DC and DC posi tions transpose internal 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 cir cuit it should not be done while measuring current or voltage without first turning off the circuit power When making measurements on the 50uA 250mV or 10A range polarity can be corrected only by reversing the test leads Measurement of Unknown Voltage or Current Sometimes the approximate voltage or current to be measured is known and the correct range may easily be selected Often however particularly when working upon faulty equipment the voltage or current is unknown or may be much higher than normal or anticip
38. 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 jack c Connect the ends of test leads together to short the VOM resistance circuit 25 4 11 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 Disconnect shorted test leads Measuring Resistance Before measuring resistance in a circuit make sure the power is off to the circuit being tested and all capacitors are discharged Dis connect shunting components from the circuit before measuring its resistance Set the range switch to one of the resistance range positions Figure 4 12 as follows 1 Use R X 1 for resistance read ings from 0 2000 2 Use R X 100 for resistance readings from 200 to 20 0000 3 Use R X 10 000 for resistance readings above 20 0000 Set the function switch at either DC or DC position The results are the same in either position un less there are semiconductors in the circuit See paragraph 4 12 Adjust ZERO OHMS control for each resistance range Observe the reading on the OHMS scale at the top of the dial Figure 4 12 Jacks and Switch Positions for Measuring Resistance NOTE The OHMS
39. urce Care b Immediately clean all spilled materials from the instrument and wipe dry If necessary moisten a cloth with soap and water to clean plastic surfaces Do not allow the battery to fully discharge When the batteries reach the end of their useful life they should be replaced promptly Failure to do so may result in corrosion at the battery contacts due to battery leakage d Whenever possible avoid prolonged exposure or usage in areas which are subject to temperature and humidity extremes vibration mechanical shock dust corrosive fumes or strong electrical or electromagnetic interferences e Monthly care 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 necessary f Annual Care It is recommended that the Instrument be returned annually to the nearest Authorized Service Center or the factory for an overall check adjustment and calibration g Storage When the Instrument is not in use store it in a room free from tem perature extremes dust corrosive fumes and mechanical vibration or shock If storage time is expected to exceed 30 days remove batteries 29 6 6 1 6 2 PARTS LIST AND SCHEMATIC DIAGRAM This Instrument must be serviced by qualified personn
40. use or permit the use of equipment with faulty insulation until it has been properly repaired Always wear safety glasses when working in electrical circuitry Do not work alone on high voltage circuits Make certain that someone ca pable of giving aid is watching nearby Do not handle the Instrument its test leads or the circuitry while high voltage is being applied Hands shoes floor 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 the Instrument Do not change switch settings or test lead connections while the circuit is energized A mistake could damage the Instrument and cause personal in jury Locate all voltage sources and accessible current paths before making con nections to circuitry A Dangerously high voltages may appear unexpectedly or in unexpected locations in faulty equipment An open bleeder resistor for example may result in a capaci tor retaining a dangerous charge k Make certain that the equipment being worked on is properly grounded and fuses are of the proper type and rating Double check switch positions and jack connections before applying power to the Instrument Remain alert for low voltage circuits which may be floating at high voltage with respect to earth ground and for composite voltages AC DC as found in r f amplifiers The floating voltage or composite vol
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