User Manual - Temperature & Process Instruments, Inc.
Contents
1. 34 5 B SAFETY CONSIDERATIONS WARNING Please follow manufacturers test procedures whenever possible Do not attempt to measure unknown voltages or components until a complete understanding of the circuit is obtained GENERAL GUIDELINES ALWAYS Test the 183 before using to make sure it is operating properly Inspect the test leads before using to make sure there are no breaks or shorts Double check all connections before testing Have someone check on you periodically if working alone Have a complete understanding of the circuit being measured Disconnect power to circuit then connect test leads to the 183 and then to circuit being measured NEVER Attempt to measure unknown high voltages Attempt to measure current with the meter in parallel to the circuit Connect the test leads to a live circuit before setting up the instrument Touch any exposed metal part of the test lead assembly 4 3 EC Declaration of Conformity This is to certify that model 183 conforms to the protection requirements of the council directive 89 336 EEC in the approximation of laws of the member states relating to Electromagnetic compatibility and 73 23 EEC The Low Voltage Directive by application of the following standards EN 50081 1 1992 Emissions Standard EN 50082 1 1992 Immunity Standard EN61010 1 1993 Safety Standard EN61010 2 031 1995 Safety Standard To en2. 5 Connect test leads to circuit to be measured 6 Reconnect power to circuit to be measured 7 Read the voltage on the 183 Optional Function 8 Press the gray button on the 183 9 Read the frequency of the voltage being mea sured in the lower left hand corner of the LCD Application Notes Disconnect power from the termi nal block find the fuse or circuit breaker that controls the block and turn it off Set up the meter following the steps under Measurement Procedure on page 17 Then proceed with the following Connect the red test lead to the hot side of the block and the black lead to the neutral side of the block Reconnect power to the block and read the voltage on the meter The reading should be approximately 110V to 130V Disconnect power from the block and move the red wire to ground Reconnect power to the block and read the voltage on the meter Typically less than 20V should exist from neutral to ground If 110V or above exists the block may be wired incorrectly 19 18 Application Notes When measuring the DC current of a flame controller follow the steps under Measurement Procedure on page 18 and then proceed with the following Set up the meter for making a mA measurement Connect the meter to the flame controller lead by opening the circuit and inserting the leads in series with the circuit as shown in the picture above c Measuring DC Amps
3. 400 0 1 0 5 of reading 600V DC or 4k 0 001k 5 digits AC Peak 40k 0 01k 400k 0 1k 4M 0 001M 1 of reading 40M 0 01M 10 digits f Diode Test Test Voltage Max Test Current Over Load Protection 3V Approx 2 5mA 600 V DC or Peak AC Warning Use only correct size voltage and current rated fuses Test Leads Use only correct type and overvoltage category rating 3 Specifications cont 3 Specifications cont 11 13 12 Selects the Capacitance function Hz Selects the Frequency function Input Jacks A Red test lead connection for current measurements on the A and A functions mA A Red test lead connection for current measurement on the mA and mA functions COM Black test lead connection for all functions V Red test lead connection for all Volt Ohm Diode and Continuity measurements RS 232C Jack on See section on RS 232C interface right side 2 Power On Options Disable Auto Off Hold down the REC button while turning on the instrument Activate RS 232C Hold down the COMP button while Computer turning on the instrument Also disables Communication Auto Power Off when using computer communication function D MEASUREMENT TECHNIQUES 1 Controls and Functions Push Buttons Activates Back Light for the LCD automatically turns off after approx 70 sec REC Activates the Min Max Ave mode COMP Activat
4. CAUTION Do not attempt to make a current measurement with the test leads connected in parallel with the circuit to be tested Test leads must be connected in series with the circuit WARNING Do not attempt to make a current measurement of circuits with more than 600V present Instrument damage and or personal injury may result Instrument set up FUNCTION BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING umA COM mA 0 01mA 400 0mA A COM A 0 001A 10 00A Measurement Procedure 1 Disconnect power to circuit to be measured 2 Plug black test lead into the COM input jack 3 Plug red test lead into the mA or A input jack depending on the value of current to be measured 4 Set the rotary switch to the mA or A function 5 Connect the test leads in series to the circuit to be measured 6 Reconnect power to circuit to be measured 7 Read the current on the 183 21 20 e Measuring Resistance WARNING Do not attempt to make resistance measurements with circuit energized For best results remove the resistor completely from the circuit before attempting to measure it NOTE To make accurate low ohm measurements short the ends of the test leads together and record the resistance reading Deduct this value from actual readings Instrument set up FUNCTION BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING COM V Hz 0 1 40 00
5. the function as follows 1 To use Compare Mode manually select the correct range for the function 2 Depress the COMP button 3 Depress the EDIT button The right hand digit under the HIGH sub display will start to flash 4 Depress the REL or HOLD buttons until the correct number is selected for the position 5 Depress the REC button The next digit to the right of 3 above will start to flash 6 Repeat steps 4 and 5 until the correct values for all eight digits under LOW and HIGH sub displays are entered 7 After the correct LOW and HIGH values are entered depress the EDIT button 8 Measure the circuit or component being compared to the programmed values Results will be displayed as PASS for the acceptable readings LO for low readings and HI for high readings 9 Depress the COMP button or turn the rotary switch to exit the function 29 28 m Two Hold System The two hold system is a data hold feature that will automatically store a stable reading under the 1 HOLD sub display in the lower left hand corner of the LCD When a new stable reading is obtained the reading under 1 HOLD will be moved to 2 HOLD and the new reading will be displayed under 1 HOLD Depress the HOLD button to activate the feature Push the button again to de activate the feature l Relative Mode The Relative mode takes the actual reading on the main display and compares it to a reference value programmed by t
6. 183 Digital Multimeter Instruction Manual 2 3 A INTRODUCTION 1 Congratulations Thank you for purchasing a TPI Digital Multimeter The Triple Display 183 is an innovative new concept in DMM design The unique display enables you to view more than one event at a time This eliminates the hassle of switching back and forth to review minimum maximum or preset comparative values The meter is also easy to use and built to last The 183 is covered by a 3 Year Limited Warranty 2 Product Description The 183 is a hand held autoranging DMM The backlit LCD can display three readings at one time In addition to basic functions of ACV DCV ACA DCA Diode Test and Continuity the 183 measures Frequency Hz and Capacitance The 183 also has RS232 output and software for recording information into a PC The 183 also features REC Records Min Max and Average readings during specified measurement intervals Time refer ence can also be displayed to determine when the values were recorded COMP Compare actual reading to preset HI and LOW values for Pass Fail testing of components HOLD Two hold system automatically holds the previous stable reading when a new one is obtained The 183 comes complete with the following accessories Battery Rubber Boot Test Lead Set Instruction Manual TABLE OF CONTENTS page A INTRODUCTION 1 Congratulations 3 2 Product
7. ATIONS 0 5 Basic DCV Accuracy
8. Description 3 3 EC Declaration of Conformity 4 B SAFETY CONSIDERATIONS 5 C TECHNICAL DATA 1 Features and Benefits 7 2 Product Applications 8 3 Specifications 9 D MEASUREMENT TECHNIQUES 1 Controls and Functions 12 a Disable Auto Power Off 13 b Activating PC Communications 13 2 Step by Step Procedures a Measuring DC Volts 15 b Measuring AC Volts 17 c Measuring DC Amps 18 d Measuring AC Amps 20 e Measuring Resistance 21 f Measuring Diodes 22 g Continuity Buzzer 23 h Measuring Capacitance 24 i Measuring Frequency 25 j Record Mode 26 k Compare Mode 27 l Relative Mode 28 m Two Hold System 29 n RS 232C Interface 30 E ACCESSORIES 32 F MAINTENANCE 33 G TROUBLE SHOOTING GUIDE
9. Hz 0 05 of reading 600V DC or 2 0000kHz 0 0001kHz 2 digits Peak AC 20 000kHz 0 001kHz 200 00kHz 0 01kHz l General Specifications Max Volt between 1000V any Input and Ground Fuse Protection mA 0 5Amp 600VAC A 10Amp 600VAC Display Type Digital 4 000 Count 4 times per second update Analog 2x41 segments 20 times per sec update Operating Temp 0 to 40 C 32 to 113 F Storage Temp 20 to 60 C 4 to 140 F Relative Humidity 0 to 80 0 35 C 32 95 F 0 to 70 35 55 C 95 131 F Temp Coefficient 0 1 x Specified Accuracy per C for temperature lt 18 C to gt 28 C Power Supply 9 Volt Battery Battery Life 100 hrs Alkaline Size H x L x W 33mm x 86mm x 187mm 1 3 x 3 4 x 7 4 Weight 380g 14 4oz c DCA Range Resolution Accuracy Overload Protection 400 A 0 1 A 0 5 of reading Fuse fast blow 4000 A 1 A 5 digits F600V 5A 31CM 40mA 0 01mA 400mA 0 1mA 4A 0 001A 0 75 of reading Fuse fast blow 10A 0 01A 5 digits F600V 10A 31CM d ACA Range Resolution Accuracy Overload Protection 400 A 0 1 A 0 75 of reading Fuse fast blow 4000 A 1 a 5 digits F600V 5A 31CM 40mA 0 01mA 400mA 0 1mA 4A 0 001A 1 of reading Fuse fast blow 10A 0 01A 5 digits F600V 10A 31CM e OHM Resistance Range Resolution Accuracy Overload Protection
10. M Measurement Procedure 1 Disconnect power to circuit to be measured 2 Plug black test lead into the COM input jack 3 Plug red test lead into V Hz input jack 4 Set the rotary switch on the 183 to the function 5 Connect the test leads to the circuit to be measured 6 Read the resistance value on the 183 d Measuring AC Amps CAUTION Do not attempt to make a current measurement with the test leads connected in parallel with the circuit to be tested Test leads must be connected in series with the circuit WARNING Do not attempt to make a current measurement of circuits with more than 600V present Instrument damage and or personal injury may result Instrument set up FUNCTION BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING umA COM mA 0 01mA 400 0mA A COM A 0 001A 10 00A Measurement Procedure 1 Disconnect power to circuit to be measured 2 Plug black test lead into the COM input jack 3 Plug the red test lead into the mA or A input jack depending on the value of current to be measured 4 Set the rotary switch to the mA or A function 5 Connect test leads in series to circuit to be measured 6 Reconnect power to circuit to be measured 7 Read the current on the 183 23 22 g Continuity Buzzer WARNING Do not attempt to make continuity measurements with circuit energized Instrument set up FUNCTION BLACK
11. RED TEST LEAD TEST LEAD COM V Hz Measurement Procedure 1 Disconnect power to circuit to be measured 2 Plug black test lead into the COM input jack 3 Plug the red test lead into the V Hz input jack 4 Set the rotary switch to the function 5 Press the gray push button to activate the con tinuity buzzer 6 Connect test leads to circuit to be measured 7 Listen for the buzzer to confirm continuity f Measuring Diodes CAUTION Do not attempt to make diode measurements with circuit energized The only way to accurately test a diode is to remove it completely from the circuit before attempting to measure it Instrument set up FUNCTION BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING COM V Hz 0 001V 2 000V Measurement Procedure 1 Disconnect power to circuit to be measured 2 Plug black test lead into the COM input jack 3 Plug red test lead into V Hz input jack 4 Set the rotary switch to the function 5 Connect the black test lead to the banded end of the diode and the red test lead to the non banded end of the diode 6 Reading on the display should be between 0 5 and 0 8 volts 7 Reverse test lead connections in 5 above 8 Reading on the display should be OFL Overload NOTE If diode reads 0 in both directions diode is shorted If diode reads OFL in both directions diode is open 25 24 7 Read the capacit
12. ations ACA Heat anticipator current in thermostats ACV Line voltage ACV or DCV Control circuit voltage DC A Flame safeguard control current OHMS Heating element resistance continuity OHMS Compressor winding resistance OHMS Contactor and relay coil resistance OHMS Continuity of wiring CAP Motor start and run capacitance Hz FREQ Frequency on controls and line voltage REC Record min max voltage of controls and line voltages DCmV Temperature with optional temperature adapter A310 ALL Bar graph to indicate rapid fluctuations in measurements ELECTRICAL ACV Measure line voltage OHMS Continuity of circuit breakers Hz FREQ Frequency of line and control voltage DCV Voltage of direct drive DC motors ELECTRONIC ACV Measure power supply voltage OHMS Continuity of circuit breakers REL Match components COMP Compare readings in circuits or components Hz FREQ Frequency of line and control voltage UL 3111 1 10 g Continuity Buzzer Test Voltage Threshold Over Load Protection 3V 1000 digits 600 V DC or Peak AC h Capacitance Range Resolution Accuracy Over Load Protection 10 F 0 01 F 2 of reading 600V DC or 100 F 0 1 F 5 digits Peak AC 1000 F 1 F 10 000 F 1 F 3 of reading 7 digits i Frequency Range Resolution Accuracy Over Load Protection 200 00Hz 0 01
13. ck Instrument damage and or personal injury may result WARNING Do not attempt to make a voltage measurement of more than 1000V or of a voltage level that is unknown Instrument set up FUNCTION BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING mV COM V Hz 0 1mV 400 0mV V COM V Hz 0 001V 1000V Measurement Procedure 1 Disconnect power to circuit to be measured 2 Plug black test lead into the COM input jack 3 Plug red test lead into the V input jack 4 Set rotary switch to either the mV or V range depending on the voltage to be measured 5 Connect test leads to circuit to be measured 6 Reconnect power to circuit to be measured 7 Read the voltage on the 183 17 16 b Measuring AC Volts CAUTION Do not attempt to make a voltage measurement if a test lead is plugged in the A or mA input jack Instrument damage and or personal injury may result WARNING Do not attempt to make a voltage measurement of more than 750V or of a voltage level that is unknown Instrument set up FUNCTION BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING V Hz COM V Hz 0 001V 750V Measurement Procedure 1 Disconnect power to circuit to be measured 2 Plug black test lead into COM input jack 3 Plug red test lead into the V input jack 4 Set the rotary switch to the VHz function depending on the voltage to be measured
14. d 27 26 j Record Mode The record mode saves minimum MIN and maximum MAX values measured for a series of readings The main part of the LCD displays the actual reading the MAX value is constantly dis played on the lower left hand sub display while the MIN value is constantly displayed on the lower right hand sub display Activate the function as follows 1 Depress the REC button on the 183 2 The 183 will immediately start to record and display MIN MAX values on the two lower sub displays A confirmation beep will sound every time a new value is recorded 3 Press REC button a second time and the AVE average reading will be displayed 4 Press the REC button again to return to normal record mode 5 To terminate the record mode hold the REC button down for approximately 2 seconds or turn the rotary switch to a different function Optional Function Time Reference on Min Max Readings While in Record Mode push the gray button the two sub displays will show the elapsed time in seconds since the last Min Max values were obtained By setting a clock at the start of the recording session you can easily determine the approximate time that values were measured k Compare Mode The compare mode takes the actual reading on the main display and compares it to LOW and HIGH values programmed by the user on the sub displays This is used to compare components or measurements for acceptable readings Activate
15. es the Compare mode REL Activates the REL mode RANGE Activates manual ranging EDIT Activates the EDIT mode for the Compare and Relative functions HOLD Activates two hold data hold mode Activates special dual functions on LCD Min Max time reference Rotary Switch Off Turns the instrument off mV Selects the DC mV function V Selects the DCV function VHz Selects the ACV function Push the yellow button to display frequency of measured voltage on lower display Selects the diode test function Selects resistance function Push yellow button to activate continuity buzzer mA Selects the DC mA function A Selects the DCA function 10A max A Selects the ACA function 10A max mA Selects the AC mA function 15 14 Application Notes When measuring DC Voltage of a battery the most accurate reading can be attained by testing the battery under load To accomplish this follow steps 1 through 4 shown on page 15 and the following with the battery in holder and device turned on Connect the red test lead from the meter to the positive terminal of the battery Connect the black test lead to the negative terminal of the battery Reconnect power to the circuit and read the voltage on the 183 3 Step by Step Procedures a Measuring DC Volts CAUTION Do not attempt to make a voltage measurement if a test lead is plugged in the A or mA input ja
16. f com 2 on return n RS 232C Interface Demonstration software is provided with the 183 The pro gram is written for windows using Visual Basic For your own applications consult the following 1 Specification Baud Rate 1200 Parity Bit None Data Bit 7 Stop Bit 1 2 Data Formats FAR_DDDDDDT Indicator Description F Function Code A Indicates Auto or Manual Range R Range Code _ Space DDDDDD Reading Data with decimal pointer and sign T Data Delimiters Function Codes Code Function Code Function Code Function 0 ACV 4 ACA 8 1 OHMS 5 DCA 9 ACmA 2 DCV 6 Diode A Capacitance 3 DCmV 7 CmA B Frequency Range Codes Func Ranges Code 0 1 2 3 4 5 0 2 4 00V 40 00V 400 0V 1000V 7 9 40 00MA 400 0MA 4 5 4 000A 10 00A 1 400 0 4 000k 40 00k 400 0k 4 000M 40 00M B 200 00Hz 2 0000kHz 20 000kHz 200 00kHz A 400 0nF 4 000 F 40 00 F 3 400mV 6 4 000V 33 32 F MAINTENANCE 1 Battery Replacement The 183 will display BAT when the 9 Volt battery needs replacement Battery replaced as follows a Disconnect and remove all test leads from live circuits and from the 183 b Remove 183 from protective boot c Remove the three screws from back of housing d Carefully pull apart fr
17. he user on the right hand sub display The left hand sub display will show the percentage the actual reading varies from the refer ence value Activate the function as follows 1 To use Relative mode manually select the range for the function 2 Depress the REL button 3 Depress the EDIT button The right hand digit under the REF sub display will start to flash 4 Depress REL or HOLD buttons until correct number is selected for that display position 5 Depress the REC button The next digit to the right of 3 above will start to flash 6 Repeat steps 4 and 5 until correct values for all four digits under REF sub display are entered 7 After the correct REF value is entered depress the EDIT button 8 Measure the circuit or component being com pared to the programmed reference value Results will be displayed as a percentage in the lower left hand sub display 9 Depress the REL button or turn the rotary switch to exit the function 31 30 Auto or Manual Range Codes Code Mode 0 Manual Range 1 Auto Range Example Application Program cls gosub ComOpen on Com 2 on WaitLoop goto WaitLoop CompOpen close 1 open com2 1200 n 7 1 rs cs ds cd as 1 return GetCom com 2 off input 1 rd if len rd gt 9 then RdgData right rd amp FunCode left rd 1 ModCode mid rd 2 1 RgeCode mid rd 3 1 print FunCodes ModCode RgeCode RdgData end i
18. ng the rotary switch returns the 183 to normal Record Records Min Max and Average values Time reference when value was obtained Compare Compares stored value with measured value for matching components Relative Displays measured value as a of stored Percentage value for checking component tolerances RS232 Output Transfers data directly to a PC while measuring Back Light Allows viewing in any light condition Autorange Automatically selects the best range for the measurement 9 8 3 Specifications IEC 1010 Over Voltage CAT II 1000V CAT III 600V Pollution Degree 2 a DCV Range Resolution Accuracy Impedance 400mV 0 1mV 0 3 of reading 10M 4V 0 001V 2 digits 40V 0 01V 400V 0 1V 1000V 1V b1 ACV 45Hz to 450Hz Range Resolution Accuracy Impedance 4V 0 001V 0 75 of reading 10M 40V 0 01V 5 digits 400V 0 1V 750V 1V b2 ACV 450Hz to 5kHz Range Resolution Accuracy Impedance 4V 0 001V unspecified 10M 40V 0 01V 2 of reading 400V 0 1V 5 digits 750V 1V b3 ACV 5kHz to 20kHz Range Resolution Accuracy Impedance 4V 0 001V unspecified 10M 40V 0 01V 2 5 of reading 400V 0 1V 5 digits 750V 1V unspecified 2 Product Applications Perform the following tests and or measurements with the TPI 183 and the appropriate function HVAC R DCmV Thermocouples in furnaces or gas applic
19. ont and rear instrument housing e Remove old batteries and replace with new batteries f Reassemble instrument in reverse order from above 2 Fuse Replacement Both the A and mA A input jacks are fuse protected Use only Fast Blow 600 Volt fuses with correct current ratings Failure to do so will void all warranties If either do not function replace as follows a Disconnect and remove all test leads from live circuits and from the 183 b Remove 183 from protective boot c Remove the three screws from back of housing d Carefully pull apart the front and rear instru ment housing e Remove old fuse s and replace it with new fuse s f Reassemble instrument in reverse order from above 3 Cleaning your 183 Use a mild detergent and a slightly damp cloth to clean the surfaces of the 183 E ACCESSORIES Standard Accessories Part No 9 Volt Alkaline Battery A009A Fuse 0 5 Amp A104 Fuse 10 Amp A110 Test Lead Set A050 Rubber Boot A101 Optional Accessories Part No Demonstration Software A108 Deluxe Test Lead Set SDK1 IEC 1010 Deluxe Test Lead Kit TLS2000B Temperature Adapter A301 Boot Hook A103 Soft Carrying Case A100 These accessories have not been evaluated by UL and are not consid ered as part of the UL Listing of this product 34 G TROUBLE SHOOTING GUIDE Problem Probable Causes Does not power up Dead or defective battery B
20. or value on the LCD i Measuring Frequency WARNING Never attempt a frequency measurement with a voltage source greater than 600V Determine the voltage of any unknown frequency source before connecting the instrument in frequency mode Instrument set up FUNCTION BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING Hz COM V Hz 0 01Hz 200 00KHz Measurement Procedure 1 Disconnect power to circuit to be measured 2 Plug black test lead into the COM input jack 3 Plug red test lead into the V Hz input jack 4 Set the rotary switch to the Hz function 5 Reconnect power to circuit to be measured 6 Read the frequency on the LCD h Measuring Capacitance WARNING All capacitance measurements are to be made on de energized circuits with all capacitors discharged only Failure to de energize and dis charge capacitors before attempting to measure them could result in instrument damage and or personal injury Instrument set up FUNCTION BLACK RED MINIMUM MAXIMUM TEST LEAD TEST LEAD READING READING COM V Hz 0 01 F 10000 F Measurement Procedure 1 Disconnect power to circuit to be measured 2 Remove capacitor from the circuit and discharge it 3 Plug black test lead into the COM input jack 4 Plug the red test lead into the V Hz input jack 5 Set the rotary switch to the function 6 Connect test leads to capacitor to be measure
21. roken wire from battery snap to PCB Won t display current readings Open fuse Open test lead Improperly connected to circuit under test All functions except ohms read high Very weak battery that will not turn on the low battery indicator on the LCD ACV do not read Very weak battery that will not turn on the low battery indicator on the LCD WARRANTY Please refer to product warranty card for warranty statement Test Products International Inc 9615 SW Allen Blvd Ste 104 Beaverton OR USA 97005 503 520 9197 Fax 503 520 1225 info tpi thevalueleader com L183M 07 02 02 copyright 2002 Test Products International Inc Function Range Resolution DCV 400mV 0 1mV 4V 0 001V 40V 0 01V 400V 0 1V 1000V 1V ACV 4V 0 001V 40V 0 01V 400V 0 1V 750V 1V DCA 400 A 0 1 A 4000 A 1 A 40mA 0 01mA 400mA 0 1mA 4A 0 001A 10A 0 01A ACA 400 A 0 1 A 4000 A 1 a 40mA 0 01mA 400mA 0 1mA 4A 0 001A 10A 0 01A OHM 400 0 1 4k 0 001k 40k 0 01k 400k 0 1k 4M 0 001M 40M 0 01M Capacitance 10 F 0 01 F 183 100 F 0 1 F 1000 F 1 F 10 000 F 1 F Capacitance 4nF 1pF 185 40nF 10pF 400nF 100pF 4 F 1nF Frequency 200 00Hz 0 01Hz 2 0000kHz 0 0001kHz 20 000kHz 0 001kHz 200 00kHz 0 01kHz Test Voltage Max Test Current Diode 3V Approx 2 5mA Test Voltage Threshold Continuity 3V 1000 digits 183 SPECIFIC
22. sure conformity with these standards this instrument must be operated in accordance with the instructions and specifications given in this manual CAUTION Even though this instrument complies with the immunity standards the accuracy can be affected by strong radio emissions not covered in the above standards Sources such as hand held radio transceivers radio and TV transmitters vehicle radios and cellular phones generate electromag netic radiation that could be induced into the test leads of this instrument Care should be taken to avoid such situations or alternatively check to make sure that the instrument is not being influenced by these emissions 7 6 INTERNATIONAL SYMBOLS CAUTION RISK OF ELECTRIC SHOCK AC ALTERNATING CURRENT DC DIRECT CURRENT REFER TO INSTRUCTION MANUAL GROUND FUSE DOUBLE INSULATION C TECHNICAL DATA 1 Features and Benefits Safety Meets CE and IEC 1010 requirements UL Listed to U S and Canadian Safety Standards True RMS Needed to accurately measure non sinu soidal AC voltage and current waveforms found on many controls and circuits Triple Display Shows more than one reading simultaneously Analog Bar Shows rapidly changing input signals Graph that the normal display will not Two Hold Holds two readings on the display at System the same time Auto Off Automatically powers instrument off after 30 minutes of inactivity Pressing any push button or turni
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