Extech Instruments EX845 User Manual Download Page 8

 

Resistance Measurements 

Note: Remove power before making resistance measurements 

1. 

Insert the black test lead into the negative 

COM

 terminal and the red 

test lead 

into the 

Ω

 

positive terminal. 

2. 

Set the function switch to the 

Ω 

position. 

3. 

Touch the test probe tips across the circuit or component under test. 

4. 

Read the resistance on the LCD display. 

 

 

Capacitance Measurements 

WARNING:

 To avoid electric shock, discharge the capacitor under test 

before 

measuring. If “

dISC

” appears in the display, remove and 

discharge the 

capacitor. 

1. 

Set the function switch to the 

 

capacitance

 

position. 

2. 

Insert the black test lead banana plug into the negative 

COM

 jack  

and the r

ed test lead banana plug into the 

CAP 

positive jack. 

3. 

Press MODE to zero any stray capacitance. 

4. 

Touch the test probe tips across the part under test. 

5. 

Read the capacitance value in the display. 

6. 

The display will indicate the proper decimal point and value. 

Note: For very large values of capacitance measurement time can be 

several minutes 

before the final reading stabilizes. 

Frequency Measurements 

1. 

Set the function switch to the V Hz Position. 

2. 

Press and hold the MODE button to select the Frequency (Hz)  
function. “k Hz” will appear in the display. 

3. 

Insert the black test lead banana plug into the negative COM jack 

and the red test lead banana plug into the Hz positive jack. 

4. 

Touch the test probe tips across the part under test. 

5. 

Read the Frequency value on the display. 

6. 

The display will indicate the proper decimal point and value. 

7. 

Press and hold the MODE button again to return to the voltage mode 

Summary of Contents for EX845

Page 1: ...User s Guide Bluetooth Series 1000 Amp Clamp Meters with IR Thermometer AC DC True RMS Clamp meter Patented ...

Page 2: ...erature AC DC Voltage Resistance Capacitance Frequency Continuity Diode Specific functions DC Current True RMS Type K thermometer DC Zero Auto Power OFF Max Min recording Data Hold Peak Hold Backlit LCD display Careful use of this meter will provide many years of reliable service ...

Page 3: ...ccuracy CAUTIONS Improper use of this meter can cause damage shock injury or death Read and understand this user manual before operating the meter Always remove the test leads before replacing the battery or fuses Inspect the condition of the test leads and the meter itself for any damage before operating the meter Repair or replace any damage before use Use great care when making measurements if ...

Page 4: ...cons Description HOLD Data Hold Minus sign Negative reading display 0 to 3999 Measurement display digits ZERO DCA Zero P Peak value AUTO Auto Range mode DC AC Direct Current Alternating Current MAX Max reading MIN Min reading Low battery mV or V Milli volts or Volts Voltage Ω Ohms Resistance A Amperes Current F Farad Capacitance Hz Hertz Frequency o F and o C Fahrenheit and Celsius units Temperatu...

Page 5: ...1 5 5d AC Voltage 50 60Hz True RMS 600 VAC 2 0 5d 400 0 mVDC 0 8 2d 4 000 VDC 40 00 VDC 400 0 VDC 1 5 2d DC Voltage 600 VDC 2 0 2d 400 0Ω 1 0 4d 4 000kΩ 40 000kΩ 400 0kΩ 1 5 2d 4 000MΩ 2 5 3d Resistance 40 00MΩ 3 5 5d 4 000nF 5 0 30d 40 00nF 5 0 20d 400 0nF 4 000µF 40 00µF 3 0 5d 400 0µF 4 0 10d 4 000mF 10 10d Capacitance 40 00mF unspecified 4 000kHz 1 5 2d Frequency Sensitivity 100V 50Hz 50V 50 t...

Page 6: ... thermocouple required IR Spectral response 6 to 16µm IR Emissivity 0 95 fixed IR distance ratio 8 1 Input Impedance 10MΩ VDC and VAC AC bandwidth 50 to 400Hz AAC and VAC AC response True rms AAC and VAC Crest Factor 3 0 in 40A and 400A ranges 1 4 in 1000A range 50 60Hz and 5 to 100 of range Operating Temperature 41 F to 104 F 5 C to 40 C Storage Temperature 4 F to 140 F 20 C to 60 C Operating Hum...

Page 7: ...and improves accuracy for DC current measurements To perform a zero select ADC and with no conductor in the jaw 1 Press the DC ZERO button to zero the display ZERO will appear in the display The offset value is now stored andremoved from all measure ments 2 To view the stored value press the DC ZERO button ZERO will flash and the stored value will be displayed 3 To exit this mode press and Hold th...

Page 8: ...ug into the CAP positive jack 3 Press MODE to zero any stray capacitance 4 Touch the test probe tips across the part under test 5 Read the capacitance value in the display 6 The display will indicate the proper decimal point and value Note For very large values of capacitance measurement time can be several minutes before the final reading stabilizes Frequency Measurements 1 Set the function switc...

Page 9: ...terminal 2 Set the function switch to the position 3 Use the MODE button to select continuity The display icons will change when the MODE button is pressed 4 Touch the test probe tips across the circuit or component under test 5 If the resistance is 40Ω a tone will sound Diode Test 1 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positi...

Page 10: ...ot normally present a hazard but may present some potential for hazard if viewed directly for extended periods of time IR Spot to Distance Diagram The 8 1 spot to distance ratio determines the size of the measured surface area with respect to the distance the meter is held away from the surface IR Measurement Notes 1 The object under test should be larger than the spot target size calculated by th...

Page 11: ... continue to update and store the max and min readings 4 To exit MAX MIN mode press and hold the MAX MIN key for 2 seconds Temperature Units F C The temperature units selection switch is located in the battery compartment To change the units remove the battery door lift out the battery and set the switch for the desired units LCD Backlight Button The LCD is equipped with backlighting for easier vi...

Page 12: ... ission FCC of the U S Government These limits are part of comprehensive guidelines and establish permitt ed levels of RF energy for the general population The guidelines are based on standards that were develope d by independent scientific organizations through periodic and thorough evaluation of scientific studies The s tandards include a substantial safety margin designed to assure the safety o...

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