Simpson 260® Series 8XPI Volt-Ohm
Contents
1. sssss 3 4 Polarity Reversing iaieiiea pee e ae a aaae aane TEA iaaa ak 3 5 Measurement of Unknown Voltage or Current 3 6 Test LAGS EE une E TA A A ie Se Di 3 7 DC Voltage Measurement rnrrnnnvnnnnvnnnvnnenrnnnvnnenrnnnvnnenrnrsnenenrnsnvenen 3 7 1 DC Voltage Measurement 0 250 mV Range 3 7 2 DC Voltage Measurement 0 2 5 Through 0 250V Range 3 7 8 DC Voltage Measurement 0 500V Range eese 3 7 4 DC Voltage Measurement 0 1000V Range eene 3 8 AC Voltage Measurement rnnnrnnnnnnnnvnenvnnnnrnnnvnnnnrersvnnenenennn 3 8 1 AC Voltage Measurement 0 2 5 Thru 0 250V Range 3 8 2 AC Voltage Measurement 0 500V Range eee 3 8 8 AC Voltage Measurement 0 1000V Range 3 9 Output Voltage Measurement 3 10 Decibel Measurement 20 to 50 dB rrnvrnnnnnvrenenvrnnrrvrnnnenvrerenvnnn 3 11 Direct Current Measurement 3 11 1 Direct Current Measurement 0 50uA Range ssec 3 11 2 Direct Current Measurement 0 1mA Through 0 500mA Rarig anie eet re rere tente nera EE LEER 3 11 3 Direct Current Measurement 0 10A Range 3 12 Zero Ohms Adjustment sss 3 13 Measuring Resistance rrrnnnrnvonnvnnrnrernvnnrenrrnnenrnrernrnnrrnenrenvrerernnne 3 14 Resistance Measurement of Semiconductors Continued Contents Continued 3 15 Gontiri ity Tests 2 E Ron mete 24 4 OPERATING SERVICING rrrrrrnnv2. 3 8 1 AC Voltage Measurement 0 2 5 Thru 0 250V Range Before proceeding with the following steps review the Safety Precautions in Para graph 3 2 a Set the function switch to AC volts only positions NOTE The meter will not indicate if the switch is incorrectly set to a DC position b Setthe range switch at one of the five voltage range positions marked 2 5V 10V 25V 50V or 250V When in doubt as to actual 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 17 more accurate reading c Plug the black test lead 45 into the COMMON jack AG VOLTAGE RANGES 2 5 VAC RANGE the test lead into 4 OVAC RANGE the jack 50 VAC RANGE 3 250 VAC RANGE 500 VAC RANGE 2 d Turn off power to the cir cuit to be measured and discharge any capaci tors 1 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 3 the value directly on the scale marked 2 5VAC For the 10V 25V 50V and 250V ranges read the red scale marked AC and use FETU the black figure immedi 10Hz 100Hz 1KHz 10KHz 100KHz ately above the scale FREQUENCY Figure 3 2 Frequency Response AC Voltage Ranges PERCENT
3. Simpson 260 Series 8XPI 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 specifications 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 applicable and are defined below To ensure the safety of operating performance of this in strument these instructions must be adhered to N Warning refer to accompanying documents AN Caution risk of electric shock A 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 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. 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 A 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 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 wait for the meter indication to read zero and then interchange test lead connections to the circuit 3 12 Zero Ohms Adjustment When resistance is measured the INTERNAL batteries B1 and B2 furnish power for the circuit Since batteries are subject to variation in voltage and internal resis tance the Instrument 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 ref
5. 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 1 9 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 with accuracy of reading indica tion 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 CAUTION or WARNING symbols throughout the publication where applicable and is de fined on the inside front cover under Notes and Safety Information Adhere to these instructions in order to ensure the safety of operating and servicing person nel 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
6. Output Ranges scale marked 2 5VAC For the 10V 25V 50V or 250V ranges use the red scale marked AC and read the black figures immediately above the scale 3 10 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 8 serves this purpose and is calibrated to a reference level zero dB of 0 001 watt into 600 ohms The scale calibration 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 accor dance with the chart below a Review the safety precautions in paragraph 3 2 b Use operating instructions for AC VOLTAGE MEASUREMENT 0 2 5 10 25 50 250V RANGES paragraph 3 8 c Read decibels on the bottom scale marked dB For the 10 25 50 250V ranges add the appropriate factor from the following chart 0 2 5 V 20 to 10 read directly 0 10 V 8 to 22 add 12 dB to reading TTT TTT 6 4 2 PERCENT RELATIVE ERROR Ho ii 10KHz 100KHz 0 50 V 6 to 36 add 26 dB to reading 0 25 V 0 to 30 add 20 dB to reading 0 250 V 20 to 50 add 40 dB to reading NOTE The maximum voltage ratio that can be measured is 50 dB on the 0 250V range d If dB measurements are bei
7. RELATIVE ERROR o 3 8 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 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 OBSERVE ALL SAFETY PRECAUTIONS in paragraph 3 2 and in the instruction manual for the equipment being tested a Set the function switch to 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 250V 500V 1000V position c Plug the black test lead into the COMMON jack and the red test lead in the 500V jack d Be sure the power is off in the circuit being measured and that all its capaci tors have been discharged e Connect the test leads across the circuit voltage to be measured with the black lead to the grounded side 18 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 3 8 3
8. by the factor at the switch position K on the OHMS scale equals one thousand 3 14 Resistance Measurement of Semiconductors A 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 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 23 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 Section 1 NOTE The resistance of diodes will measure differently from one resistance range to another on th
9. case can also be placed either in a vertical or horizontal position The hori zontal position is preferable for greater accuracy since the Instrument is calibrated in this position 11 3 OPERATION This section of the manual contains information required to use and operate the 260 8 in a safe and proper manner Multifunction instruments VOM s such as the 260 8 are intended as general pur pose measuring Instruments for use in low power circuitry Such as found in con sumer appliances TV and radio receivers and in general laboratory applications Their use is not recommended in high voltage high power circuitry where opera tor 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 transmitters power sub stations and distribution centers x ray equipment large motor controls etc Work ing in the high voltage section of such equipment requires single function often specially designed instruments operated by specially trained personnel who use appropriate protective equipment and procedures 3 1 Safety Precautions The following precautions are suggestions and reminders of commonly recog nized safe practices as well as specific hazards to be avoided and are not implied to be sufficient to ensure the safety of untrained personnel in all circumstances Neither i
10. 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 rotation of the zero adjuster slightly to introduce mechanical freedom or play but in sufficient to disturb the position of the indicating pointer This procedure will avoid disturbances to the zero setting by subsequent changes in tem perature humidity vibration and other environ mental conditions This white button is the overload protection circuit breaker Resetting this button will restore meter to full operation providing overload condition has been removed 14 3 4 Polarity Reversing The function switch provides a convenient means to reverse polarity of the internal battery to facilitate testing semiconductor devices The DC and DC positions 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 circuit it should not be done while measuring current or voltage without first turning off the circuit power When making measurements on the 50uA 250mV 1 Volt or 10 Amp range polarity can be corrected only by reversing the te
11. relay contacts Some overload conditions may cause the fuses to burn out as well as open the relay contacts d When an overload of sufficient magnitude is applied to the VOM the reset button will pop up approximately 3 16 inch above the surface of the panel To reset the VOM for normal operation first remove the overload and depress the button If the overload remains connected to the Instrument resetting the overload protection reset button will not connect the VOM input circuit In addition to the overload protection circuit a pair of diodes protects the indicat ing instrument circuit The diode limits the current through the coil in case of overload 1 2 1 Fuses Basic overload protection is provided by a small inexpensive and easily obtainable 3 AG type 1 Amp quick blow fuse This fuse is rated to interrupt circuit voltages up to 250V A supplemental high energy fuse is provided for additional protection from severe overloads This fuse is the Bussman Type BBS 2A 600V with an interrupt capacity of 10 000 Amps AC The Littlefuse Type BLS 2A 600V may also be used NOTE If the 260 fails to indicate a reading the 1 or 2 Amp fuse may be burned out Refer to paragraph 4 2 for fuse replacement Use only the specified fuse type The 0 10 A range is not fused The shunt connects directly to the 10 A and 10 A jacks The relay fuse and diodes will prevent serious damage to the Instrument in most cases of accidental overload How
12. the batteries 2 2 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 LL 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 instruc tions 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 2 3 Shipping Pack the Instrument carefully and ship it prepaid and insured to the proper des tination 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 16044 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
13. the top wall of the case NOTE 1 Amp and 2 Amp 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 c To replace the 1 Amp fuse 1 Pull defective fuse from its retaining spring clips 2 Snap in the replacement fuse and replace the cover NOTE A spare fuse is located in a cavity next to the fuse clip 4 3 Fuse Protection A 1 Amp 250V quick acting fuse and a 2A high voltage high interruption capacity fuse are connected in a 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 nominally high overload If the Instrument fails to indicate the 1 Amp or the 2 Amp fuses may be burned out Refer to paragraph 4 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 25 4 5 Care N a Do not attempt to clean this Instrument with the test leads connected to a power source b 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 c D
14. AC Voltage Measurement 0 1000V Range 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 3 2 and in the instruction manual for the equipment being tested Do not attempt any voltage measurement which may exceed 1000V or the circuit to ground voltage of the instrument 1000V maxi mum Do not attempt any voltage measurement which may exceed 1000V or the circuit to ground voltage of the Instrument 1000V maximum Make certain 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 being measured a Set the function switch at AC NOTE The meter will not indicate if the switch is incorrectly set to a DC position b Set the range switch at 250V 500V 1000V position c Plug the black test lead into the COMMON jack and the red test lead in the 1000V jack d Make sure the power is off in the circuit being measured and that all its ca pacitors have been 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 figures and multiply by 100 3 9 Outp
15. Through 0 500mA Range a Set the function switch at DC 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 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 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 multiply by 10 For the 500 mA range use the 0 50 figures and multiply by 10 21 f Turn the power off and disconnect the test leads AN 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 3 11 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 10mA Open the ground 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
16. ain 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 24 4 2 Battery and Fuse Replacement The batteries and 1 Amp fuse are located inside an isolated compartment at the top rear of the Instrument case To open the battery and fuse compartment a Place the Instrument face down on a soft padded surface b Unscrew the single screw on the cover c Remove the cover from the case and set aside Batteries and fuse may now be replaced NOTE If replacement of the 2 Amp high current interrupting fuse is necessary the Instrument case must be removed If the pointer cannot be adjusted to zero ohms or the R X 1 or R X 100 range replace the 1 5 V battery If the pointer cannot be adjusted to zero on the R X 10K range replace the 9 V battery a To replace the D size battery 1 Remove the old 1 5 V battery 2 Insert the end of battery first pushing against the terminal spring clip then gently push the side of the battery into place b Toreplace the 9 V battery 1 Remove the battery with the mating connector from the compartment 2 Take the connector off the old battery and connect it to the new battery 3 Insert new battery into the compartment 4 Place the connector leads so they rest between the cavity walls and clear the fuse terminals The extended leads are placed between the battery holder and
17. 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 pur chaser 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 authorizes 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 has
18. atures Range Switch Twelve positions May be rotated 360 in either direction to select any of the five AC amp DC volt ages four DC currents amp three resistance ranges Function Switch The function switch has four positions Audio DG DC and AC Volts only To measure DC cur rent or voltage set function switch to the DC or DC position depending on polarity of the signal applied across the test leads To measure AC volt age set the function switch to the AC position For resistance measurement switch may be set in ei ther the DC or DC position Polarity of the inter nal ohm meter battery voltage will be as marked at the jacks when switch is in the DC position and reversed in the DC position Zero Ohms This control is used to compensate for variation in the voltage of the internal batteries when making resistance measurements 13 4 5 6 Figure 3 1 Operational ltems and Features Circuit Jacks Point Adjust For Zero Reset Button 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 in conjunction with the black test lead as the reference point for the measurement of all the functions with the excep tion of the 10A range 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
19. been subject to misuse neg ligence 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 Company 2 Contents INTROBUGTION icti ette ete irer 1 1 General Description vicina romae te cte mete e 1 2 Overload Protection raii erena araa erara e ae a e enne 1 2 1Fuses vis 1 3 Internal Batteries saadan datiden 1 4 Overload Circuit Test 1 5 Printed Circuit 1 6 X Adjust A Vue Handle 1 7 Test Leads T 1 8 echnical Data uk ic co eei ti t ib need 1 9 Definition Of Accuracy sssssssseeeenenneeneenee nennen 1 10 Safety Considerations wits W241 Audio Alarm cuni Ee ie cete eo ELE UE Erie e Da ERO TIR 1 12 ACCeSSOrIGS uiia eei aen debuts dn eten 1 13 Additional Accessories ssssssssse 1 13 1 Accessory DC High Voltage Probes 1 13 2 Accessory AC High Voltage Probe 1 13 3 Amp Clamp Model 150 2 sse INSTAEBATION s tini tette tte tree eMe te ee de 2 1 Unpacking and Inspection 2 2 Warranty osise eee trenes 2 3 Shipping isst ELE 2 4 Power Source Requirements ccesceseeeeeeeeeeeeeeeeeseeeeeneessaeeeeeeenaees 2 5 Operating POSION gs sseni sasatan aere ert ite es OPERATION loeo reto ed oct TE 3 1 Safety Precautlons 35 5 2 eerte RM 3 2 Operational Items and Features
20. e 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 N Turn off all power to the circuit being tested before proceeding any further a Setthe FUNCTION switch to the 5 Insert the black test lead into the COM MON and the red test lead into the jack b Touch the test lead probe tips together An audio sound should be heard 3 15 Continuity Tests C To test for continuity probe the circuit or component in question An audible sound indicates continuity The higher the circuit s resistance the lower the sound level The lower the circuit s resistance the higher the sound level 4 OPERATING SERVICING This Instrument has been carefuly 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 from these instruments ZN Before opening the battery compartment cover disconnect the test leads from live circuits 4 1 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 Next remove the four case fas tening screws and lift the case from the panel When replacing the case make cert
21. e function switch at DC b Plug the black test lead in the COMMON jack and the red test lead into the 50 uA 250mV jack Set the range switch at 50 uA 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 e 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 3 4 15 3 7 2 DC Voltage Measurement 0 2 5 Through 0 250V Range a Set the function switch at DC 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 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 t
22. e switch settings or test lead connections while the circuit is 12 3 2 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 Make certain that the equipment being worked upon 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 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 Do not make electrical measurements where the air may contain explosive concentrations of gas or dust such as in mines grain elevators gasoline sta tions 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 Operational Items and Features Table 3 1 describes the function of all the items used to operate the Instrument These items are illustrated in Figure 3 1 Become familiar with these items prior to operating the Instrument for the first time 1 2 3 Table 3 1 Operating Items and Fe
23. er to Section 4 e Disconnect shorted test leads 22 3 13 Measuring Resistance A Voltage applied to a resistance range will cause reading errors if low and damage 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 resistance being measured may cause reading errors Check circuit diagrams for the pres ence of such components before assuming that the reading obtained is correct a Before measuring resistance in a circuit make sure the power is off to the circuit being tested and all capacitors are discharged Disconnect shunting components from the circuit before measuring its resistance b Set the range switch to one of the resistance range positions as follows 1 Use R X 1 for resistance readings from 0 to 200 2 UseR X 100 for resistance readings from 200 to 20 000 3 Use R X 10 000 for resistance readings above 20 000 Q c Set the function switch at either DC or DC position The results are the same in either position unless there are semiconductors in the circuit see paragraph 3 14 Adjust ZERO OHMS control for each resistance range d Observe the reading on the OHMS scale at the top of the dial NOTE The OHMS scale reads from right to left for increasing values of resis tance e To determine the resistance value multiply the reading
24. ever no overload protection system is com pletely foolproof and misapplication on high voltage circuits can damage the In strument Exercise care and caution to protect both the user and the Instrument 1 3 Internal Batteries Two batteries are in the ohmmeter circuits a NEDA 13F D cell that furnishes 1 5 V for the R X 1 and R X 100 ranges and a NEDA 1604A Alkaline battery that furnishes 9 V for the R X 10 000 range The 1 5 V 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 V battery is held in place with a spring clip but contact is made with a separate connector that is polarized Al ways observe correct polarity when replacing the 1 5 V D cell The 9 V battery must be installed and tested before the Instrument is ready for use Perform the overload test described in Paragraph 1 4 to ensure proper over load circuit operation prior to using the Instrument 1 4 Overload Circuit Test a Setthe range switch to R X 10 000 position and the function switch to the DC position b Plug the black test lead into the COMMON jack terminal and touch the other end of the test lead to the 10 A input terminal The relay reset button should rise indicating that the overload circuit is in working condition NOTE No damage will occur to the Instrument as a result of this test 1 5 Printed Circuit Most of t
25. he 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 3 7 3 DC Voltage Measurement 0 500V Range A Use extreme care when working with high voltage circuits Do not touch the In strument or test leads while power is on in the circuit being measured Before proceeding with the following steps review the Safety Precautions in Para graph 3 2 a Set the function switch at DC 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 Make 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 e Turn on power in circuit being measured f Read the voltage using the 0 50 figures on the black scale marked DC Multiply the reading by 10 NOTE Turn off power to the circuit and wait until the meter indicates zero before disconnecting the test leads 16 3 7 4 DC Voltage Measurement 0 1000V Range A Use extreme care when working with high voltage circuits Do not touch the In strument or test leads while power is on in the circuit being measured Before proceeding with the following steps review the Safety Precautions in Para graph 3 2 a Set the functio
26. he component parts are mounted on a printed circuit board which simpli fies assembly and maintenance thus extending the useful life of the Instrument 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 1 7 Test Leads Each Instrument is furnished with one pair Catalog Number 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 fur nished 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 Amps These ratings for the test leads must not be exceeded in any application 1 8 Technical Data Table 1 1 Technical Data 1 DC VOLTS Ranges 0 1 2 5 10 25 50 250 500 1000V Sensitivity 20 000 ohms per volt 2 DCMILLIVOLTS Range 0 250mV Sensiti
27. is provided regardless of polarity The relay operates at a uniform percent of overload since the indicating instrument circuit is common to all ranges When actuated by an overload the relay contacts which are in the COMMON CIRCUIT latch open until the reset button on the front panel is depressed A Due to its sensitivity to overloads the electronic overload protection relay incorpo rated in the 260 is susceptible to electrostatic fields from high potentials or tran sients either in the circuit being measured or in nearby circuitry Do not assume the relay to be faulty if it trips out without apparent cause It may be indicating a dangerous condition such as excessive circuit to ground floating voltage being applied to the Instrument Avoid loading the Instrument or its test leads until certain that excessive circuit to ground voltage does not exist a A switch that is opened when the relay latches opens the relay circuit and prevents continuous battery drain This condition occurs when the reset but ton has been pressed so that the VOM is operational the protection circuit draws less than the shelf life drain of the battery b Since the 9 V battery is used for both the R X range and the protection circuit the VOM is designed to allow the protection circuit to function normally as long as the R X range can be set to zero and an Alkaline battery is used 5 c The 1 and 2 Amp fuses in the input circuit add protection to the
28. n switch at DC 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 Make sure power is off in the circuit being measured and all capacitors are 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 e Turn on power in circuit being measured f Read the voltage using the 0 10 figures on the black scale marked DC Mul tiply the reading by 100 NOTE Turn off power to the circuit and wait until the meter indicates zero before disconnecting the test leads 3 8 AC Voltage Measurement N Branch and distribution circuits 120 240 480V etc can deliver dangerous explo sive power momentarily into a short circuit before the fuse breaker opens the cir cuit Make certain that the Instrument switches are set properly jacks are con nected properly and that the circuit power is turned off before making connections to such circuits The 260 responds to the average value of an AC waveform lt is calibrated in terms of the RMS value of a pure sine wave If the waveform is nonsinusoidal depending on its waveform the reading may be either higher or lower than the true RMS value of the measured voltage An error may be introduced if the 260 is used to measure a nonsinusoidal waveform Also accuracy is lessened at higher input frequencies Figure 3 2
29. ng made to a 0 006 watt into 5000 reference level subtract 7 dB from the reading obtained on the 260 3 11 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 ener gized Always turn the power off and discharge all the capacitors before changing switch settings or disconnecting leads 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 ground side of the circuit In all direct current measurements make certain that the power to the circuit being tested has been turned off before connecting and disconnecting test leads or restoring circuit continuity 3 11 1 Direct Current Measurement 0 50uA Range a Set the function switch at DC b Plug the black test lead into the COMMON jack and the red test lead into the 50uAMPS 250mV jack c Set the range switch at SOuAMPS dual position with 50V d Open the ground 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 e Read the current on the black DC scale Use the 0 50 figures to read directly in microamperes NOTE For polarity reversing see paragraph 3 4 3 11 2 Direct Current Measurement 0 1mA
30. o not allow the battery to fully discharge When the batteries reach the end of their useful life they should be promptly replaced Failure to do so may result in corrosion at the battery contacts due to battery leakage d 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 e 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 f 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 9 When not in use store Instrument in a room free from temperature extremes dust corrosive fumes and mechanical vibration or shock If Instrument is stored more than thirty days remove batteries 26 NOTES 27 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 115022 Edition 7 11 01 Visit us on the web at www simpsonelectric com
31. rrent 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 six 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 10 2 INSTALLATION This section contains information and instructions for the installation and shipping of the Simpson 260 8XPI Included are unpacking and inspection procedures warranty shipping power source requirements and operating position 2 1 Unpacking and Inspection Examine the shipping carton for obvious signs of damage If damage is noted notify the carrier and supplier and do not attempt to use the Instrument If Instru ment appears to be in good condition read Operator s Manual in its entirety Be come familiar with the Instrument as instructed in the manual then check the electrical performance as soon as possible Make sure that all items are included with the Instrument Table 1 2 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 alligator clips for the test leads are in a polyethylene bag See Section 4 for instructions on how to open the battery compartment and install
32. s this manual a substitute for technical manuals covering the equipment being measured 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 trained in the safety precautions required to avoid possible in jury 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 ca pable of giving aid is watching nearby g Donot handle the Instrument its test leads or the circuitry while high voltage is being applied h Hands shoes floor and workbench must be dry Avoid making measure ments under humid damp or other environmental conditions that could ef fect the dielectric withstanding voltage of the test leads or Instrument i Do not chang
33. st leads 3 5 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 on faulty equipment the voltage or current is either unknown or may be much higher than normal and anticipated When working upon unfamiliar or unknown equipment 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 3 6 Test Leads These are provided with accessory screw on alligator clips which may be attached to the probe tips As well as eliminating the need to hand hold test prods to a circuit for extended periods the test clips provide a means of reducing hand prox imity 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 3 7 DC Voltage Measurement N Before making voltage measurements review the SAFETY PRECAUTIONS listed in paragraph 3 2 Also when using the 260 as a millivoltmeter care must be taken to prevent damage to the indicating instrument from excessive voltage 3 7 1 DC Voltage Measurement 0 250 mV Range Before using the 250 millivolt range use the 2 5V DC range to determine that the voltage measured is not greater than 250 mV or 25 V DC a Setth
34. tage 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 Probes The DC high voltage probes are designed for use with the Simpson 260 Series 8 or any 20 000 ohms per volt VOM having a 2 5 volt DC range and scale gradua tions from 0 10 or multiple thereof for the 10 kV probe 0 50 or multiple thereof for the 40 kV probe The DC high voltage test probes are available at local electronic parts distributors Accuracy Probe Resistance 2 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 8 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 without breaking the circuit under test The Amp Clamp works in effect as a transformer containing a split core for accommodating the conductor which carries the current being measured The cu
35. 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 Items 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 Littlefuse Type 4312001 1 2A 600V Fuse Littlefuse Type BLS or Bussman Type BBS 1 Operator s Manual 6 115022 Batteries are standard items replaceable at local retail stores 9 1 13 Additional Accessories Table 1 3 Additional Accessories Description Catalog Number Deluxe Case uden a agamer ieee ril 00812 Vinyl Sheath Case cenit actin endete te iis eee tt o dae det 01818 Leatherette Ever Redy Hard Case Drop Front sessssss 00805 5 000 Volt AC Probe 5 k Q V ssssssssseseseeeennemem mene 00794 5 000 Volt DC Probe 20 k Q V 00795 10 000 Volt AC Probe 5 k Q V sssssssssssseeeenneen enne 00036 10 000 Volt DC Probe 20 k Q V 00034 Model 150 2 Amp Clamp sse 00541 Model 151 2 Line Splitter rnrrnrnonnnnonrnnnnrnenronnnrnnnvennnrnnnvnnnnrennnnnrnrennen 00544 High voltage probes and test prod adapters provide a convenient and economical means of extending the voltage range of the 260 They are intended for high vol
36. ut Voltage Measurement It is 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 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 3 3 Do not connect the OUTPUT jack to a circuit in which the DC voltage component exceeds 350V 19 Before proceeding with the fol lowing steps review the Safety Precautions in Paragraph 3 2 OUTPUT RANGES 10 2 5 VAC RANGE 10VAC RANGE 25 50 VAC RANGE 250 VAC RANGE 8 a Set the function switch to AC Volts only position b Plug the black test lead into the COMMON jack and the red test lead into the OUTPUT jack c 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 6 measured with the black test lead to the ground 8 side e Turn on the power in the 105 test circuit Read the out Ht HH put voltage on the appro 10Hz 100Hz 1KHz priate AC voltage scale FREQUENCY For the 0 2 5V range read Figure 3 3 Frequency Response the value directly on the
37. vity 20 000 ohms per volt 3 AC VOLTS Ranges 0 2 5 10 25 50 250 500 1 000V Sensitivity 5 000 ohms per volt 7 OUTPUT VOLTAGE AG Ranges DC MICROAMPERES Range Voltage Drop DC MILLIAMPERES Ranges Voltage Drop Approx DC AMPERES Range Voltage Drop Approx 0 2 5 10 25 50 250 limited to 350 VDC 0 50uA 250mV 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 Center Reading 12000 120 0000 13 14 15 Nominal Short Circuit Current 125 mA 1 25 mA 75uA ACCURACY DC Voltage Ranges DC Current 0 50 uA 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 TEST LEADS SIZE WEIGHT 2 of Full Scale 1 596 of Full Scale 2 of Full Scale 3 of Full Scale Referenced to 100 Hz Figures 3 2 and 3 3 2 5 of Arc 2 of Arc 2 of Arc 20 to 10 dB 8 to 22 dB 0 to 30 dB 6 to 36 dB 20 to 50 dB With zero dB power level equal to 1 mW across a 6000 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 Bussman Type 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 2 1 4 Ibs 1 02 Kg 8 16 RATED CIRCUIT TO GROUND VOLTAGE 1000V AC DC
38. vvvnnrrrssrrrrnerrrrssrrrnnrrrsrsrrrnnerssssrrnnnnene 24 4 1 Removing the Instrument Case sese 24 4 2 Battery and Fuse Replacement sssse 25 4 3 FUSE Protection ies incen ta Ave ek edit deeft 25 4 5 Gale une enn Aeneas NG 26 1 INTRODUCTION 1 1 General Description The Simpson Volt Ohm Milliammeter 260 Series 8XPI hereafter referred to as the 260 or 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 Continuity Test Alarm Individual Dual Jacks for the 500 V AC DC and 1000 V AC DC Ranges High Impact Case Yellow 1 2 Overload Protection All the ranges with exception of 1V 200 mV 500 1000 V AC and DC are protected by an electronic overload protection system The protection is from the usual overloads that would damage the VOM A transistorized circuit senses the voltage drop across the indicating instrument and actuates a relay when the voltage reaches approximately 3 to 4 times rated full scale voltage Sensing of the voltage drop is by means of a bridge network so that overload protection
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