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OPERATING INSTRUCTIONS 

Precautions 

1. 

Ensure that the selected meter function matches the measurement to be taken. 

2. 

If the measured current is higher than the range selected for long periods, overheating may 
occur compromising the safety and the operation of the meter’s internal circuits. 

3. 

To avoid discharge risks and erroneous readings, do not measure current on high voltage 
conductors (>600V). 

AC Current Measurements 

WARNING: 

 Make sure that the test leads are disconnected from the meter’s terminals before 

making current measurements with the clamp jaw. 

1. 

Set the Function switch to the 

A

 range.. 

2. 

Press the trigger to open jaw. Fully enclose one conductor to be measured. 

3. 

The clamp meter will automatically select the proper range (Auto Range). 

4. 

Read the measured value from the LCD display. 

Summary of Contents for 38390

Page 1: ...User s Manual Digital AC Clamp Meter Model 38390 ...

Page 2: ...ing operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is incl...

Page 3: ...ol adjacent to another symbol or terminal indicates the user must refer to the manual for further information This symbol adjacent to a terminal indicates that under normal use hazardous voltages may be present Double insulation WARNING This indicates that a potentially hazardous condition which if not avoided could result in death or serious injury CAUTION This indicates that a potentially hazard...

Page 4: ... jaws test leads and the meter for any damage before operating the meter Repair or replace any damage before use 4 Do not exceed the maximum rated input limits 5 Use great care when making measurements especially when the voltages are greater than 25VAC rms or 35VDC These voltages are considered a shock hazard 6 Always discharge capacitors and remove power from the device under test before perform...

Page 5: ...450Hz Input Z 1MΩ 660Vrms OL protect DC Voltage 400 0V 600V 1 5 digits Input Z 1MΩ 660V overload protect Resistance 0 3 to 400 Ω 1 5 digits 1 1 to 1 3V open circuit 600Vrms overload protect Continuity Audible tone 40Ω approximately 1 1 to 1 3V open circuit 600Vrms overload protect Note Accuracy specified as of reading number of digits at 64 o F to 82 o F 18 o C to 28 o C and RH 80 ...

Page 6: ...tic ranging Display 3 3 4 digit 3999 Count LCD Overload Indication OL Low Battery Indication Battery icon Environmental conditions Installation Category II Pollution degree 2 Altitude up to 2000 meters Indoor use only Operating Temperature Humidity 32 to 104F 0 o C to 40 o C 80 RH Storage Temperature Humidity 14 to 140F 10 o C to 60 o C 70 RH Dimensions 7 4 x 2 5 x 1 2 188 x 62 5 x 30 5mm Weight 6...

Page 7: ...y H Display Data Hold A Auto Range Low Battery icon Units V Volt voltage Ω Ohm resistance A Amps current Front panel 1 Jaw opening trigger 2 Function switch OFF A V Ω 3 COM input jack 4 Transformer Jaws 5 DATA HOLD key 6 AC DC Selector key 7 LCD Display 8 VΩ input jack ...

Page 8: ...avoid discharge risks and erroneous readings do not measure current on high voltage conductors 600V AC Current Measurements WARNING Make sure that the test leads are disconnected from the meter s terminals before making current measurements with the clamp jaw 1 Set the Function switch to the A range 2 Press the trigger to open jaw Fully enclose one conductor to be measured 3 The clamp meter will a...

Page 9: ...LLEL with the circuit to be measured 5 Read the measured value from the LCD display Resistance and Continuity Measurements CAUTION Before taking any in circuit resistance measurements remove power from the circuit under test and discharge all capacitors 1 Set the Function switch to the Ω position 2 Insert the black test lead to the COM input jack and the red test lead to the Ω input jack 3 Connect...

Page 10: ...Data Hold Press the HOLD key momentarily to freeze the present reading on the LCD H will appear in the display Press the HOLD key again to return to normal operation ...

Page 11: ...etergent Do not use abrasives or solvents Battery Replacement When the low battery symbol appears on the LCD replace the meter s two button batteries 1 Remove power and remove test leads from meter 2 Remove the two rear Phillips screws and open the meter housing 3 Remove and replace the two 1 55V button batteries per the following illustrations 4 ICE replacement number LR 44 NEDA replacement numbe...

Page 12: ...Battery Replacement Illustrations 1 Slide battery to right 2 Press on other side to lift battery 3 Remove battery 4 Insert battery on angle 5 Press to seat battery ...

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