291

291 Digital Clamp-on Meter Amp Plus Instruction Manual TABLE OF CONTENTS A. INTRODUCTION A. INTRODUCTION 1. Congratulations ..........................3 2. Product Description ....................3 3. Declaration of Conformity ..........4 1. Congratulations!! B. SAFETY CONSIDERATIONS ..............5 C. TECHNICAL DATA 1. Features and Benefits..................6 2. Product Applications ..................7 3. Specifications..............................8 D. MEASUREMENT TECHNIQUES 1. Controls and Functions ............10 2. Step by Step Procedures: ........13 E. ACCESSORIES ................................21 F. MAINTENANCE ................................22 G. TROUBLE SHOOTING GUIDE ..........23 2 Thank you for purchasing TPI products. The Amp Plus is easy to use and is built to last. It is backed by a 3 year limited warranty. Please remember to complete and return your product warranty registration card. 2. Product Description The 291 is a hand-held manual ranging clamp-on DMM. The 291 is an affordable choice offering measurements in all basic electrical functions. • Bar Graph When measuring frequency, bar graph indicates current level. • Peak Mode For start-up and inrush currents. • Sleep Mode Preserves battery life. • Data Hold Holds the reading on the display for easy viewing. The 291 comes complete with the following accessories: Carrying Pouch Test Lead Set Instruction Manual Battery 3 TABLE OF CONTENTS A. INTRODUCTION A. INTRODUCTION 1. Congratulations ..........................3 2. Product Description ....................3 3. Declaration of Conformity ..........4 1. Congratulations!! B. SAFETY CONSIDERATIONS ..............5 C. TECHNICAL DATA 1. Features and Benefits..................6 2. Product Applications ..................7 3. Specifications..............................8 D. MEASUREMENT TECHNIQUES 1. Controls and Functions ............10 2. Step by Step Procedures: ........13 E. ACCESSORIES ................................21 F. MAINTENANCE ................................22 G. TROUBLE SHOOTING GUIDE ..........23 2 Thank you for purchasing TPI products. The Amp Plus is easy to use and is built to last. It is backed by a 3 year limited warranty. Please remember to complete and return your product warranty registration card. 2. Product Description The 291 is a hand-held manual ranging clamp-on DMM. The 291 is an affordable choice offering measurements in all basic electrical functions. • Bar Graph When measuring frequency, bar graph indicates current level. • Peak Mode For start-up and inrush currents. • Sleep Mode Preserves battery life. • Data Hold Holds the reading on the display for easy viewing. The 291 comes complete with the following accessories: Carrying Pouch Test Lead Set Instruction Manual Battery 3 3. EC Declaration of Conformity This is to certify that TPI Model 291 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 EN 50082-1 EN 61010-1 EN 61010-2-031 EN 61010-2-032 1992 Emissions Standard 1992 Immunity Standard 1993 Safety Standard 1995 Safety Standard 1995 Safety Standard To ensure conformity with these standard, this instrument must be operated in accordance with the instructions and specifications given in this manual. 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 • • • • • CAUTION: Even though this instrument complies with the immunity standards, it’s 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 electromagnetic 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 influence by these emissions. • Test the 291 before using it 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 291, 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. CAUTION: 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. 4 5 3. EC Declaration of Conformity This is to certify that TPI Model 291 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 EN 50082-1 EN 61010-1 EN 61010-2-031 EN 61010-2-032 1992 Emissions Standard 1992 Immunity Standard 1993 Safety Standard 1995 Safety Standard 1995 Safety Standard To ensure conformity with these standard, this instrument must be operated in accordance with the instructions and specifications given in this manual. 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 • • • • • CAUTION: Even though this instrument complies with the immunity standards, it’s 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 electromagnetic 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 influence by these emissions. • Test the 291 before using it 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 291, 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. CAUTION: 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. 4 5 INTERNATIONAL SYMBOLS CAUTION: RISK OF ELECTRIC SHOCK AC (Alternation Current) DC (Direct Current) ! REFER TO INSTRUCTION MANUAL GROUND DOUBLE INSULATION EITHER DC OR AC C. TECHNICAL DATA 1. Features and Benefits Agency UL Listed to U.S. and Canadian Safety Standards. Meets CE and IEC 1010. 4000 Count Improves the resolution on all functions and ranges. Data Hold Maintains the reading on the display for hard to reads areas. Peak Mode Measure the inrush current of motors, relays and solenoids. Sleep Mode Automatically powers down after 10 minutes of inactivity. 6 2. Product Applications Perform the following tests and/or measurements with the 291 and the appropriate function: HVAC/R ACA ACV ACV or DCV OHMS OHMS OHMS ACA OHMS ALL • • • • • • • • • Heat anticipator current in thermostats. Line voltage. Control circuit voltage. Heating element resistance (continuity). Compressor winding resistance. Contactor and relay coil resistance. Motor and compressor start up current. Continuity of wiring. Bar graph to indicate rapid fluctuations. ELECTRICAL ACV ACA OHMS DCV ACA • • • • • Measure line voltage. Measure line current. Continuity of circuit breakers. Voltage of direct drive DC motors. Start up current of motors, relays, contactors and transformers. ELECTRONIC ACV • Measure power supply voltage. ACA • Measure power supply current. OHMS • Continuity of circuit breakers and fuses. 7 INTERNATIONAL SYMBOLS CAUTION: RISK OF ELECTRIC SHOCK AC (Alternation Current) DC (Direct Current) ! REFER TO INSTRUCTION MANUAL GROUND DOUBLE INSULATION EITHER DC OR AC C. TECHNICAL DATA 1. Features and Benefits Agency UL Listed to U.S. and Canadian Safety Standards. Meets CE and IEC 1010. 4000 Count Improves the resolution on all functions and ranges. Data Hold Maintains the reading on the display for hard to reads areas. Peak Mode Measure the inrush current of motors, relays and solenoids. Sleep Mode Automatically powers down after 10 minutes of inactivity. 6 2. Product Applications Perform the following tests and/or measurements with the 291 and the appropriate function: HVAC/R ACA ACV ACV or DCV OHMS OHMS OHMS ACA OHMS ALL • • • • • • • • • Heat anticipator current in thermostats. Line voltage. Control circuit voltage. Heating element resistance (continuity). Compressor winding resistance. Contactor and relay coil resistance. Motor and compressor start up current. Continuity of wiring. Bar graph to indicate rapid fluctuations. ELECTRICAL ACV ACA OHMS DCV ACA • • • • • Measure line voltage. Measure line current. Continuity of circuit breakers. Voltage of direct drive DC motors. Start up current of motors, relays, contactors and transformers. ELECTRONIC ACV • Measure power supply voltage. ACA • Measure power supply current. OHMS • Continuity of circuit breakers and fuses. 7 3. Specifications e. OHM (Resistance, ) IEC 1010 Over Voltage: CAT II - 1000V CAT III - 600V Pollution Degree 2 UL 3111-1 Range Res. Accuracy Overload Protection 400Ω 0.1Ω ±1% of reading, ±10 digits 600V DC or AC Peak a. DCV Range Resolution Accuracy Impedance 40V 0.01V ±0.75% of reading, 10MΩ 400V 0.1V ±3 digits 600V 1V Range Resolution Accuracy Impedance 400V 0.1V ±1.2% of reading, 10MΩ 750V 1V ±3 digits ! 8 Threshold Over Load Protection 3V < 50Ω (100 digits) 600 V DC or Peak AC Max. Volt. between any Input and Ground Display Type Operating Temp. Storage Temp. Relative Humidity c. ACA Res. 0.1A 1A Test Voltage h. General Specifications b. ACV Range 400A 700A f. Continuity Buzzer Accuracy ±1.5% of reading, ±4 digits Freq. Response 45Hz to 450Hz *Warning: Test Leads. Use only correct type and overvoltage category rating. Power Supply Battery Life Size (H x L x W) Weight 600V 4,000 Count, 4 times per second update -10° to 45°C (14° to 113°F) -20° to 55°C (-4° to 131°F) 0% to 80% (0° - 35°C/32° - 95°F) 0% to 70% (35° - 50°C/95° - 122°F) 9 Volt Battery 80 hrs. Alkaline 40mm x 190mm x 65mm (1.5in x 7.25in x 2.5in) 315g (11.1oz) 9 3. Specifications e. OHM (Resistance, ) IEC 1010 Over Voltage: CAT II - 1000V CAT III - 600V Pollution Degree 2 UL 3111-1 Range Res. Accuracy Overload Protection 400Ω 0.1Ω ±1% of reading, ±10 digits 600V DC or AC Peak a. DCV Range Resolution Accuracy Impedance 40V 0.01V ±0.75% of reading, 10MΩ 400V 0.1V ±3 digits 600V 1V Range Resolution Accuracy Impedance 400V 0.1V ±1.2% of reading, 10MΩ 750V 1V ±3 digits ! 8 Threshold Over Load Protection 3V < 50Ω (100 digits) 600 V DC or Peak AC Max. Volt. between any Input and Ground Display Type Operating Temp. Storage Temp. Relative Humidity c. ACA Res. 0.1A 1A Test Voltage h. General Specifications b. ACV Range 400A 700A f. Continuity Buzzer Accuracy ±1.5% of reading, ±4 digits Freq. Response 45Hz to 450Hz *Warning: Test Leads. Use only correct type and overvoltage category rating. Power Supply Battery Life Size (H x L x W) Weight 600V 4,000 Count, 4 times per second update -10° to 45°C (14° to 113°F) -20° to 55°C (-4° to 131°F) 0% to 80% (0° - 35°C/32° - 95°F) 0% to 70% (35° - 50°C/95° - 122°F) 9 Volt Battery 80 hrs. Alkaline 40mm x 190mm x 65mm (1.5in x 7.25in x 2.5in) 315g (11.1oz) 9 D. MEASUREMENT TECHNIQUES 1. Controls and Functions: Push Buttons PEAK Activates the Peak Hold function (ACA only.) HOLD Holds the reading on the display until the button is pushed a second time. 1. Controls and Functions: (cont.) Input Jacks COM Black test lead connection for ACV, DCV, Ω, Continuity Buzzer and Diode Test functions. Ω V/Ω Red test lead connection for all ACV, DCV, Ω , Continuity Buzzer and Diode Test functions. Rotary Switch 10 OFF Turns the 291 completely off. V Used to measure DC volts. V Used to measure AC volts. Ω Used to measure resistance and use the continuity buzzer. A Used to measure AC amps. 11 D. MEASUREMENT TECHNIQUES 1. Controls and Functions: Push Buttons PEAK Activates the Peak Hold function (ACA only.) HOLD Holds the reading on the display until the button is pushed a second time. 1. Controls and Functions: (cont.) Input Jacks COM Black test lead connection for ACV, DCV, Ω, Continuity Buzzer and Diode Test functions. Ω V/Ω Red test lead connection for all ACV, DCV, Ω , Continuity Buzzer and Diode Test functions. Rotary Switch 10 OFF Turns the 291 completely off. V Used to measure DC volts. V Used to measure AC volts. Ω Used to measure resistance and use the continuity buzzer. A Used to measure AC amps. 11 2. Step by Step Procedures: a. Measuring DC Volts ! WARNING! Do not attempt to make a voltage measurement of more than 600V or of a voltage level that is unknown. 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 13 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 291. 12 Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD MIN READING MAXI READING V COM 0.1mV 750V V/Ω 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/Ω input jack. 4. Set rotary switch to the appropriate V range. 5. Connect test leads to circuit to be measured. 6. Reconnect power to circuit to be measured. 7. Read the voltage on the 291. Optional Modes • HOLD: Freezes the reading on the LCD. • PEAK: Measures the peak voltage. 13 2. Step by Step Procedures: a. Measuring DC Volts ! WARNING! Do not attempt to make a voltage measurement of more than 600V or of a voltage level that is unknown. 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 13 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 291. 12 Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD MIN READING MAXI READING V COM 0.1mV 750V V/Ω 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/Ω input jack. 4. Set rotary switch to the appropriate V range. 5. Connect test leads to circuit to be measured. 6. Reconnect power to circuit to be measured. 7. Read the voltage on the 291. Optional Modes • HOLD: Freezes the reading on the LCD. • PEAK: Measures the peak voltage. 13 b. Measuring AC Volts ! Application Notes Disconnect power from the terminal 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 15. 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. 14 WARNING! Do not attempt to make a voltage measurement of more than 600V or of a voltage level that is unknown. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD MIN READING MAX READING V COM 0.1mV 750V V/Ω Measurement Procedure: 1. 2. 3. 4. 5. 6. 7. Disconnect power to circuit to be measured. Plug black test lead into COM input jack. Plug red test lead into V/Ω input jack. Set the rotary switch to the appropriate V function. Connect test leads to circuit to be measured. Reconnect power to circuit to be measured. Read the voltage on the 291. Optional Modes • HOLD: Freezes the reading on the LCD. • PEAK: Measures the peak voltage. 15 b. Measuring AC Volts ! Application Notes Disconnect power from the terminal 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 15. 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. 14 WARNING! Do not attempt to make a voltage measurement of more than 600V or of a voltage level that is unknown. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD MIN READING MAX READING V COM 0.1mV 750V V/Ω Measurement Procedure: 1. 2. 3. 4. 5. 6. 7. Disconnect power to circuit to be measured. Plug black test lead into COM input jack. Plug red test lead into V/Ω input jack. Set the rotary switch to the appropriate V function. Connect test leads to circuit to be measured. Reconnect power to circuit to be measured. Read the voltage on the 291. Optional Modes • HOLD: Freezes the reading on the LCD. • PEAK: Measures the peak voltage. 15 c. Measuring AC Amps Application Notes CAUTION! Do not attempt to make a current measurement with the test leads. The 291 measures the current by clamping the jaw around one conductor (wire). Clamping around more than one wire will result in erroneous readings. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD MIN READING MAX READING A NOT USED NOT USED 0.01A 700A When measuring AC Amps of a motor there are two types of measurements that can be made, running current and in-rush or start-up current. Start-up current will usually be much higher than running current. Set up the meter following the steps under “Measurement Procedure” on page 16, and then proceed with the following: • Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Set rotary switch to A function. 3. Clamp the jaws around one conductor of the circuit to be measured. 4. Reconnect power to circuit to be measured. 5. Read the current on the 291. Optional Modes • HOLD: Freezes the reading on the LCD. • PEAK: Measures the peak amperage. 16 • Clamp the meter around a single wire and reconnect power to the device. Read the current displayed on the meter. This is the running current of the motor. Disconnect power to the motor and put the meter in PEAK HOLD mode. Reconnect the power and read the current displayed on the meter. This is the in-rush or start-up current of the motor. 17 c. Measuring AC Amps Application Notes CAUTION! Do not attempt to make a current measurement with the test leads. The 291 measures the current by clamping the jaw around one conductor (wire). Clamping around more than one wire will result in erroneous readings. Instrument set-up: FUNC. BLACK RED TEST LEAD TEST LEAD MIN READING MAX READING A NOT USED NOT USED 0.01A 700A When measuring AC Amps of a motor there are two types of measurements that can be made, running current and in-rush or start-up current. Start-up current will usually be much higher than running current. Set up the meter following the steps under “Measurement Procedure” on page 16, and then proceed with the following: • Measurement Procedure: 1. Disconnect power to circuit to be measured. 2. Set rotary switch to A function. 3. Clamp the jaws around one conductor of the circuit to be measured. 4. Reconnect power to circuit to be measured. 5. Read the current on the 291. Optional Modes • HOLD: Freezes the reading on the LCD. • PEAK: Measures the peak amperage. 16 • Clamp the meter around a single wire and reconnect power to the device. Read the current displayed on the meter. This is the running current of the motor. Disconnect power to the motor and put the meter in PEAK HOLD mode. Reconnect the power and read the current displayed on the meter. This is the in-rush or start-up current of the motor. 17 d. Measuring Resistance ! WARNING! Do not attempt to make resistance measurements with circuit energized. For best results, remove the resistor completely from 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: 18 Application Notes (Resistance) FUNC. When measuring resistance of a motor, make sure the power is disconnected prior to testing. Set up meter following steps under “Measurement Procedure” on page 19, and proceed with the following: Ω • Connect the red test lead to one power input line of the motor and the black test lead to the other power input line of the motor. In most applications if the reading is OFL, the motor winding is open. • Connect the red test lead to the frame of the motor and the black test lead to the winding. In most applications if a reading of 0 Ohms is displayed, the winding is shorted to the motor frame (ground). BLACK RED TEST LEAD TEST LEAD MIN READING MAX READING COM 0.1Ω 400Ω V/Ω Measurement Procedure: 1. 2. 3. 4. 5. 6. Disconnect power to circuit to be measured. Plug black test lead into the COM input jack. Plug red test lead into V/Ω input jack. Set the rotary switch to the 400 Ω function. Connect test leads to circuit to be measured. Read the resistance value on the 291. Optional Modes • HOLD: Freezes the reading on the LCD. 19 d. Measuring Resistance ! WARNING! Do not attempt to make resistance measurements with circuit energized. For best results, remove the resistor completely from 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: 18 Application Notes (Resistance) FUNC. When measuring resistance of a motor, make sure the power is disconnected prior to testing. Set up meter following steps under “Measurement Procedure” on page 19, and proceed with the following: Ω • Connect the red test lead to one power input line of the motor and the black test lead to the other power input line of the motor. In most applications if the reading is OFL, the motor winding is open. • Connect the red test lead to the frame of the motor and the black test lead to the winding. In most applications if a reading of 0 Ohms is displayed, the winding is shorted to the motor frame (ground). BLACK RED TEST LEAD TEST LEAD MIN READING MAX READING COM 0.1Ω 400Ω V/Ω Measurement Procedure: 1. 2. 3. 4. 5. 6. Disconnect power to circuit to be measured. Plug black test lead into the COM input jack. Plug red test lead into V/Ω input jack. Set the rotary switch to the 400 Ω function. Connect test leads to circuit to be measured. Read the resistance value on the 291. Optional Modes • HOLD: Freezes the reading on the LCD. 19 e. Continuity Buzzer ! g. Peak Mode WARNING! Do not attempt to make continuity measurements with circuit energized. Instrument set-up: FUNC. Ω BLACK TEST LEAD COM RED TEST LEAD V/Ω Measurement Procedure: 1. 2. 3. 4. 5. 6. Set the 291 to either the 400 or 700 ACA range and allow the reading on the LCD to settle down to zero. Clamp the jaw around one wire of the device the peak current is to be measured from and again allow the LCD to settle down to zero. Apply power to the device and read the initial current draw by the device being measured. Disconnect power to circuit to be measured. Plug black test lead into the COM input jack. Plug red test lead into V/Ω input jack. Set the rotary switch to the Ω function. Connect test leads to circuit to be measured. Listen for the buzzer to confirm continuity. E. ACCESSORIES* Standard Accessories Part No. 9 Volt Alkaline Battery Test Lead Set Soft Carrying Pouch A009A A040 A200 Optional Modes • HOLD: Freezes the reading on the LCD. Optional Accessories Part No. f. Data Hold Deluxe Test Lead Set IEC 1010 Deluxe Test Lead Kit Hard Carrying Case SDK1C TLS2000BC A201 Press the HOLD button at any time on any function to freeze the reading on the LCD display. This function is very useful when measuring in locations where the display is difficult to read. 20 *These accessories have not been evaluated by UL and are not considered as part of the UL Listing of this product. 21 e. Continuity Buzzer ! g. Peak Mode WARNING! Do not attempt to make continuity measurements with circuit energized. Instrument set-up: FUNC. Ω BLACK TEST LEAD COM RED TEST LEAD V/Ω Measurement Procedure: 1. 2. 3. 4. 5. 6. Set the 291 to either the 400 or 700 ACA range and allow the reading on the LCD to settle down to zero. Clamp the jaw around one wire of the device the peak current is to be measured from and again allow the LCD to settle down to zero. Apply power to the device and read the initial current draw by the device being measured. Disconnect power to circuit to be measured. Plug black test lead into the COM input jack. Plug red test lead into V/Ω input jack. Set the rotary switch to the Ω function. Connect test leads to circuit to be measured. Listen for the buzzer to confirm continuity. E. ACCESSORIES* Standard Accessories Part No. 9 Volt Alkaline Battery Test Lead Set Soft Carrying Pouch A009A A040 A200 Optional Modes • HOLD: Freezes the reading on the LCD. Optional Accessories Part No. f. Data Hold Deluxe Test Lead Set IEC 1010 Deluxe Test Lead Kit Hard Carrying Case SDK1C TLS2000BC A201 Press the HOLD button at any time on any function to freeze the reading on the LCD display. This function is very useful when measuring in locations where the display is difficult to read. 20 *These accessories have not been evaluated by UL and are not considered as part of the UL Listing of this product. 21 F. MAINTENANCE G. TROUBLE SHOOTING GUIDE 1. Battery Replacement: The 291 will display a battery symbol when the internal 9 Volt battery needs replacement. The battery is replaced as follows: Problem a. Disconnect and remove all test leads from live circuits and from the 291. b. Loosen the screw from the back of the 291 battery cover. c. Remove the battery compartment cover. d. Remove old battery and replace with new battery, observing the correct polarity. e. Reassemble the instrument in reverse order from above. 2. Cleaning your 291: Use a mild detergent and slightly damp cloth to clean the surfaces of the 291. Probable Causes Does not power up • Dead or defective battery • Broken 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 AC Volts 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. 22 23 F. MAINTENANCE G. TROUBLE SHOOTING GUIDE 1. Battery Replacement: The 291 will display a battery symbol when the internal 9 Volt battery needs replacement. The battery is replaced as follows: Problem a. Disconnect and remove all test leads from live circuits and from the 291. b. Loosen the screw from the back of the 291 battery cover. c. Remove the battery compartment cover. d. Remove old battery and replace with new battery, observing the correct polarity. e. Reassemble the instrument in reverse order from above. 2. Cleaning your 291: Use a mild detergent and slightly damp cloth to clean the surfaces of the 291. Probable Causes Does not power up • Dead or defective battery • Broken 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 AC Volts 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. 22 23 291 SPECIFICATIONS ±0.75% Basic DCV Accuracy (also see pages 8-9) Func. Range Res. DCV 40V 400V 600V 0.01V 0.1V 1V ACV 400V 750V 0.1V 1V ACA 400A 700A 0.1A 1A OHM 400Ω 0.1Ω Continuity Test Voltage 3V Max Test Current < 50Ω (100 digits) Test Products International, Inc. 9615 SW Allen Blvd., Ste. 104 Beaverton, OR USA 97005 503-520-9197 • Fax: 503-520-1225 tpiusa@msn.com Test Products International plc 2 Newcourt Business Park Perry Road Harlow, Essex CM18 7PR England Tel: 01279 439647 • Fax: 01279 450553 L291M • 12/1/97 copyright © 1997 Test Products International, Inc.