Extech Instruments EX470A User Manual Download Page 12

AUTORANGING/MANUAL RANGE SELECTION 

When the meter is first turned on

it automatically goes into AutoRanging

This automatically selects 

the best range for the measurements being made and is generally the best mode for most 

measurements. For measurement situations requiring that a range be manually selected, perform 

the following: 

1. Press the RANGE key  The • 

AUTO" 

display indicator will tum off

.

2. Press the RANGE key to step through the available ranges until you select the range you

want.

3. To exit the Manual Ranging mode and return to AutoRanging, press and hold the RANGE

key for 2 seconds.

Note: 

Manual ranging does not apply for the Capacitance, Frequency and Temperature functions. 

RELATIVE MODE 

The relative measurement feature allows you to make measurements relative to a stored reference 

value. A reference voltage, current, etc. can be stored and measurements made in comparison to 

that value. The displayed value is the difference between the reference value and the measured 

value. 

1. Perform the measurement as described in the operating instructions

.

2

.

Press the REL button to store the reading in the display and the "REL" indicator will appear

on the display.

3. The display will now indicate the difference between the stored value and the measured value.

4. Press the REL button to exit the relative mode.

Note: 

The Relative function does not operate in the Frequency function.

DISPLAY BACKLIGHT 

Press and hold the HOLD key for >1 second to tum on or off the display backlight function. 

Note: The HOLD feature will activate when the Backlight is turned on. Press the HOLD key 

again 

to 

exit 

Hold

HOLD 

The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or 

to exit the HOLD function. 

AUTO POWER OFF 

The auto off feature will tum the meter off after 15 minutes. 

LOW BATTERY INDICATION 

The R  icon will appear in the lower left conner of the display when the battery voltage becomes 

low. R'eplace the battery when this appears. 

WRONG CONNECTION INDICATION 

The 

icon will appear in the upper right conner of the display and the buzzer will sound 

whenever the positive test lead is inserted into the 1 0A or 

uNmA 

input jack and a non-current 

(green, black or red) function is selected

If this occurs, tum the meter off and reinsert the test lead 

into the proper input jack for the function selected

12 

EX470A-en-GB_v6.0  6/16 

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

 TestEquipmentDepot.com 

Summary of Contents for EX470A

Page 1: ...INSTRUMENTS True RMS Multimeter plus IR Thermometer Extech EX470A CE 1R IllTEMP H0lD REL M 0 i11111i1 0000 EJC tiSl f D c J J Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Page 2: ...tages may be present IDI Double insulation IWARNING I ICAUTION I r MAX _soov This WARNING symbol indicates a potentially hazardous situation which if not avoided could result in death or serious injury This CAUTION symbol indicates a potentially hazardous situation which if not avoided may result damage to the product This symbol advises the user that the terminal s so marked must not be connected...

Page 3: ......

Page 4: ...tv Temoerature 60VDC 24VAC 2 USE EXTREME CAUTION when working with high voltages 3 DO NOT measure voltage if the voltage on the C OM inputjack exceeds 600Vabove earth ground 4 NEVER connect the meter leads across a voltage source while the function switch is in the current resistance or diode mode Doing so can damage the meter 5 ALWAYS discharge filter capacitors in power supplies and disconnect t...

Page 5: ......

Page 6: ...g will stabilize and give a proper measurement when connected to a circuit DC VOLTAGE MEASUREMENTS CAUTION Do not measure DC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter 1 Set the function switch to the green V position 2 Press the SELECT button to indicate DC on the display 3 Insert the black test lead banana plug into the...

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Page 9: ...audible signal will sound If the circuit is open the display will indicate OL DIODE TEST 1 Set the function switch to the green o i l1 position 2 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive Vjack 3 Press the SELECT button to indicate i and Von the display 4 Touch the test probes to the diode under test Forward voltage will t...

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Page 12: ...EL indicator will appear on the display 3 The display will now indicate the difference between the stored value and the measured value 4 Press the REL button to exit the relative mode Note The Relative function does not operate in the Frequency function DISPLAY BACKLIGHT Press and hold the HOLD key for 1 second to tum on or off the display backlight function Note The HOLD feature will activate whe...

Page 13: ...A AC Current 50 to 400Hz 400Hz to 1KHz 400 A 0 1 A 1 8 reading 8 digits 3 0 reading 7 digits 4000 A 1 A 40mA 0 01mA 400mA 0 1mA 4A 0 001A 3 0 reading 8 digits 3 5 reading 10 digits 10A 0 01A Resistance 400 0 1 0 8 reading 4 digits 4k 0 001k 0 8 reading 2 digits 40k 0 01k 1 0 reading 2 digits 400k 0 1k 4M 0 001M 40M 0 01M 3 0 reading 5 digits Capacitance 40nF 0 01nF 5 0 reading 7 digits 400nF 0 1nF...

Page 14: ...ed IR distance ratio 8 1 Input Impedance 7 5MΩ VDC VAC AC Response True rms ACV Bandwidth 50Hz to 1kHz Crest Factor 3 1 at full scale 6 1 at half scale Display 4000 count backlit liquid crystal Overrange indication OL is displayed Auto Power Off 15 minutes approximately Polarity Automatic no indication for positive Minus sign for negative Measurement Rate 2 times per second nominal Low Battery Ind...

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Page 16: ...ver 5 Lift the center circuit board straight up from the connectors to gain access to the fuse holders 6 Gently remove the old fuse and install the new fuse into the holder 7 Always use a fuse of the proper size and value 0 5A 600V fast blow for the 400mA range 10A 600V fast blow for the 10A range 8 Align the center board with the connectors and gently press into place 9 Replace and secure the rea...

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