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291

Digital Clamp-on
Meter

Amp Plus

Instruction Manual

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Summary of Contents for 291

Page 1: ...291 Digital Clamp on Meter Amp Plus Instruction Manual ...

Page 2: ...ar 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 TABLE OF CONTENTS A INTRODUCTION 1 Congratulations 3 2 Product Description 3 3 Declaration of Conformity 4 B SAFETY CONS...

Page 3: ...ar 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 TABLE OF CONTENTS A INTRODUCTION 1 Congratulations 3 2 Product Description 3 3 Declaration of Conformity 4 B SAFETY CONS...

Page 4: ...ctive 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 EN 61010 1 1993 Safety Standard EN 61010 2 031 1995 Safety Standard EN 61010 2 032 1995 Safety Standard To ensure conformity with these stan...

Page 5: ...ctive 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 EN 61010 1 1993 Safety Standard EN 61010 2 031 1995 Safety Standard EN 61010 2 032 1995 Safety Standard To ensure conformity with these stan...

Page 6: ...t Applications Perform the following tests and or measurements with the 291 and the appropriate function HVAC R ACA Heat anticipator current in thermostats ACV Line voltage ACV or DCV Control circuit voltage OHMS Heating element resistance continuity OHMS Compressor winding resistance OHMS Contactor and relay coil resistance ACA Motor and compressor start up current OHMS Continuity of wiring ALL B...

Page 7: ...t Applications Perform the following tests and or measurements with the 291 and the appropriate function HVAC R ACA Heat anticipator current in thermostats ACV Line voltage ACV or DCV Control circuit voltage OHMS Heating element resistance continuity OHMS Compressor winding resistance OHMS Contactor and relay coil resistance ACA Motor and compressor start up current OHMS Continuity of wiring ALL B...

Page 8: ...o 80 0 35 C 32 95 F 0 to 70 35 50 C 95 122 F Power Supply 9 Volt Battery Battery Life 80 hrs Alkaline Size H x L x W 40mm x 190mm x 65mm 1 5in x 7 25in x 2 5in Weight 315g 11 1oz 3 Specifications IEC 1010 Over Voltage CAT II 1000V CAT III 600V Pollution Degree 2 a DCV Range Resolution Accuracy Impedance 40V 0 01V 0 75 of reading 10MΩ 400V 0 1V 3 digits 600V 1V b ACV Range Resolution Accuracy Imped...

Page 9: ...o 80 0 35 C 32 95 F 0 to 70 35 50 C 95 122 F Power Supply 9 Volt Battery Battery Life 80 hrs Alkaline Size H x L x W 40mm x 190mm x 65mm 1 5in x 7 25in x 2 5in Weight 315g 11 1oz 3 Specifications IEC 1010 Over Voltage CAT II 1000V CAT III 600V Pollution Degree 2 a DCV Range Resolution Accuracy Impedance 40V 0 01V 0 75 of reading 10MΩ 400V 0 1V 3 digits 600V 1V b ACV Range Resolution Accuracy Imped...

Page 10: ...r and Diode Test functions 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 Rotary Switch OFF Turns the 291 completely off V Used to measure DC volts V Used to measure AC volts Ω Ω Used to measure resistance and use the continuity buzzer A Used to measure AC a...

Page 11: ...r and Diode Test functions 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 Rotary Switch OFF Turns the 291 completely off V Used to measure DC volts V Used to measure AC volts Ω Ω Used to measure resistance and use the continuity buzzer A Used to measure AC a...

Page 12: ...onnect 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 Application Notes When measuring DC Voltage of a bat tery 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 t...

Page 13: ...onnect 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 Application Notes When measuring DC Voltage of a bat tery 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 t...

Page 14: ...es HOLD Freezes the reading on the LCD PEAK Measures the peak voltage 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 s...

Page 15: ...es HOLD Freezes the reading on the LCD PEAK Measures the peak voltage 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 s...

Page 16: ...ower and read the current displayed on the meter This is the in rush or start up current of the motor c Measuring AC Amps 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 MIN MAX TEST LEAD TEST LEAD ...

Page 17: ...ower and read the current displayed on the meter This is the in rush or start up current of the motor c Measuring AC Amps 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 MIN MAX TEST LEAD TEST LEAD ...

Page 18: ...ut jack 4 Set the rotary switch to the 400 Ω function 5 Connect test leads to circuit to be measured 6 Read the resistance value on the 291 Optional Modes HOLD Freezes the reading on the LCD Application Notes Resistance 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 f...

Page 19: ...ut jack 4 Set the rotary switch to the 400 Ω function 5 Connect test leads to circuit to be measured 6 Read the resistance value on the 291 Optional Modes HOLD Freezes the reading on the LCD Application Notes Resistance 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 f...

Page 20: ... test lead into the COM input jack 3 Plug red test lead into V Ω input jack 4 Set the rotary switch to the Ω function 5 Connect test leads to circuit to be measured 6 Listen for the buzzer to confirm continuity Optional Modes HOLD Freezes the reading on the LCD f Data Hold Press the HOLD button at any time on any function to freeze the reading on the LCD display This function is very useful when m...

Page 21: ... test lead into the COM input jack 3 Plug red test lead into V Ω input jack 4 Set the rotary switch to the Ω function 5 Connect test leads to circuit to be measured 6 Listen for the buzzer to confirm continuity Optional Modes HOLD Freezes the reading on the LCD f Data Hold Press the HOLD button at any time on any function to freeze the reading on the LCD display This function is very useful when m...

Page 22: ...rument in reverse order from above 2 Cleaning your 291 Use a mild detergent and slightly damp cloth to clean the surfaces of the 291 G TROUBLE SHOOTING GUIDE Problem 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 Ve...

Page 23: ...rument in reverse order from above 2 Cleaning your 291 Use a mild detergent and slightly damp cloth to clean the surfaces of the 291 G TROUBLE SHOOTING GUIDE Problem 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 Ve...

Page 24: ...IFICATIONS 0 75 Basic DCV Accuracy also see pages 8 9 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 ...

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