Extech Instruments EX845 Manual de usuario

User's Guide

Extech EX845

True RMS 1000 Amp Clamp Meter

with Bluetooth

Patented

EX845-EN V2.1 02/10

Introduction

Congratulations on your purchase of the Extech EX845 CAT IV True RMS 1000A Clamp

Meter. This meter is supplied in the Meterlink kit and includes a Bluetooth module

designed for use with the Flir T/B360, T/B400 or i/b60 cameras The combination of a

clamp meter and an IR camera is used for electrical power measurement, analysis and

documentation. The EX845 measurement functions include AC/DC Voltage, AC/DC

Current, Resistance, Capacitance, Frequency, Duty Cycle, Diode Test, Continuity, Type k

thermocouple thermometer plus Non-Contact IR Temperature. Proper use and care of this

meter will provide many years of reliable service.

Safety

International Safety Symbols

This symbol, 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

SAFETY NOTES

•Do not exceed the maximum allowable input range of any function.

•Do not apply voltage to meter when resistance function is selected.

•Set the function switch OFF when the meter is not in use.

•Remove the battery if meter is to be stored for longer than 60 days.

WARNINGS

•Set function switch to the appropriate position before measuring.

•When measuring volts do not switch to current/resistance modes.

•Do not measure current on a circuit whose voltage exceeds 600V.

•When changing ranges always disconnect the test leads from the circuit under test.

Function Maximum Input

A AC, ADC 1000A DC/AC

V DC, V AC 1000V DC/AC

Resistance, Capacitance, Frequency, Diode Test 250V DC/AC

Type K Temperature 60V DC, 24V AC

EX845-EN V2.1 02/10

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 the voltages are greater than 25VAC

rms or 35VDC. These voltages are considered a shock hazard.

•Always discharge capacitors and remove power from the device under test before

performing Diode, Resistance or Continuity tests.

•Voltage checks on electrical outlets can be difficult and misleading because of the

uncertainty of connection to the recessed electrical contacts. Other means should be

used to ensure that the terminals are not "live".

•If the equipment is used in a manner not specified by the manufacturer, the protection

provided by the equipment may be impaired.

•This device is not a toy and must not reach children’s hands. It contains hazardous

objects as well as small parts that the children could swallow. In case a child

swallows any of them, please contact a physician immediately

•Do not leave batteries and packing material lying around unattended; they can be

dangerous for children if they use them as toys

•In case the device is going to be unused for an extended period of time, remove the

batteries to prevent them from training

•Expired or damaged batteries can cause cauterization on contact with the skin.

Always, therefore, use suitable hand gloves in such cases

•See that the batteries are not short-circuited. Do not throw batteries into the fire.

•Do not directly view or direct the laser pointer at an eye. Low power visible lasers

do not normally present a hazard, but may present some potential for hazard if

viewed directly for extended periods of time

EX845-EN V2.1 02/10

Description

Meter Description

1. Current clamp

2. Clamp opening trigger

3. Data Hold Button

4. Mode

5. Peak

6. Range

7. DCA Zero (EX830 only)

8. MIN/MAX

9. Backlit LCD Display

10. Test lead input jacks

11. IR thermometer and laser pointer (rear)

12. Bluetooth/Backlight Button

13. Laser pointer button

14. Function switch

Display icons Description

HOLD Data Hold

Minus sign Negative reading display

0 to 3999 Measurement display digits

ZERO 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)

ΩOhms (Resistance)

A Amperes (Current)

F Farad (Capacitance)

Hz Hertz (Frequency)

oF and oC Fahrenheit and Celsius units (Temperature)

n, m, μ, M, k Unit of measure prefixes: nano, milli, micro, mega, and kilo

•))) Continuity test

Diode test

Laser pointer

Bluetooth active symbol

EX845-EN V2.1 02/10

Operation

NOTES: Read and understand all Warning and Caution statements in this operation

manual prior to using this meter. Set the function select switch to the OFF position when

the meter is not in use.

AC Current Measurements

WARNING: Ensure that the test leads are disconnected from the meter before making

current clamp measurements.

1. Set the Function switch to the AAC

or ADC range

2. Press the trigger to open the jaw.

Fully enclose only one conductor.

For optimum results, center the

conductor in the jaw.

3. The clamp meter LCD will display

the reading.

DCA ZERO

The DC Zero feature removes offset

values 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 and

removed from all measurements.

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 the ZERO button until “ZERO” is no longer in the

display.

AC/DC Voltage Measurements

1. Insert the black test lead into the negative COM terminal and the

red test lead into the positive Vterminal.

2. Set the function switch to the VAC or VDC position.

3. Use the MODE button to select AC or DC Voltage).

4. Connect the test leads in parallel to the circuit under test.

5. Read the voltage measurement on the LCD display.

Correct Incorrect

EX845-EN V2.1 02/10

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 Ωpositive 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 red 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

CAP

EX845-EN V2.1 02/10

Type K Temperature Measurements

1. Set the function switch to the KTemp position.

2. Insert the Temperature Probe into the negative COM and the

positive TEMP jacks, observing polarity.

3. Touch the Temperature Probe tip to the device under test.

Continue to touch the part under test with the probe until the

reading stabilizes.

4. Read the temperature on the display. The digital reading will

indicate the proper decimal point and value.

WARNING: To avoid electric shock, be sure the thermocouple probe

has been removed before changing to another measurement function.

Note: An open input or a temperature overrange the meter will display

“OL” and beep.

Note: See the “Temperature Units” paragraph to select °F or °C

Note: The temperature range of the supplied thermocouple probe is -20 to 250°C (-4 to

482°F)

Continuity Measurements

1. Insert the black test lead into the negative COM terminal and the red test lead into the

Ωpositive 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 positive jack

2. Turn the function switch to position. Use the MODE button to select the diode

function if necessary (diode symbol will appear on the LCD when in Diode test mode)

3. Touch the test probe tips to the diode or semiconductor junction under test. Note the

meter reading

4. Reverse the test lead polarity by reversing the red and black leads. Note this reading

5. The diode or junction can be evaluated as follows:

If one reading displays a value (typically 0.400V to 0.900V) and the other

reading displays OL, the diode is good.

If both readings display OL the device is open.

If both readings are very small or ‘0’, the device is shorted.

EX845-EN V2.1 02/10

Non-Contact InfraRed Temperature Measurements

1. Set the function switch to the IR Temp

position.

2. Aim the infrared sensor (rear of the meter) at

the surface to be measured.

3. Press the button in the center of the rotary

function switch to turn on the laser pointer and

identify the surface spot to be measured.

4. The area of the surface to be measured must

be larger than the spot size as determined by

the distance to spot size specification.

5. Read the temperature in the display.

Note: See the “Temperature Units” paragraph to select oF or oC

WARNING: Do not directly view or direct the laser pointer at

an eye. Low power visible lasers do not 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 the

field of view diagram.

2. If the surface of the object under test is covered with frost, oil, grime, etc., clean

before taking measurements.

3. If an object's surface is highly reflective, apply masking tape or flat black paint to the

surface before measuring.

4. The meter may not make accurate measurements through transparent surfaces such

as glass.

5. Steam, dust, smoke, etc. can obscure measurements.

6. To find a hot spot, aim the meter outside the area of interest then scan across (in an

up and down motion) until the hot spot is located.

10cm

1.25cm

20cm

2.5cm

60cm

7.5cm

Distance to object

Diameter of spot

EX845-EN V2.1 02/10

Data Hold

To freeze the LCD reading, press the HOLD button. While data hold is active, the HOLD

icon appears on the LCD. Press the HOLD button again to return to normal operation.

Peak Hold

The Peak Hold function captures the peak AC or DC voltage or current. The meter can

capture negative or positive peaks as fast as 1 millisecond in duration.

1. Turn the function switch to the A or V position.

2. Use the MODE button to select AC or DC

3. Allow time for the display to stabilize.

4. Press and Hold the PEAK button until “CAL” appears in the display. This procedure

will zero the range selected.

5. Press the PEAK button, Pmax will display.

6. The display will update each time a higher positive peak occurs.

7. Press the PEAK button again, Pmin will display. The display will now update and

indicate the lowest negative peak.

8. To return to normal operation, press and hold the PEAK button until the Pmin or

Pmax indicator switches off.

Note: If the Function switch position is changed after a calibration the Peak Hold

calibration must be repeated for the new function selected.

MAX/MIN

1. Press the MAX/MIN key to activate the MAX/MIN recording mode. The display icon

"MAX" will appear. The meter will display and hold the maximum reading and will

update only when a new “max” occurs.

2. Press the MAX/MIN key and “MIN” will appear The display icon "MIN" will appear.

The meter will display and hold the minimum reading and will update only when a

new “min” occurs

3. Press the MAX/MIN key and a blinking “MAX MIN” will appear. The meter will display

the present reading, but will 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 viewing,

especially in dimly lit areas. Press the backlight button to turn the

backlight on. Press again to turn the backlight off.

Automatic Power OFF

In order to conserve battery life, the meter will automatically turn off after approximately 10

minutes. To turn the meter on again, turn the function switch to the OFF position and then

to the desired function position.

Units Switch

EX845-EN V2.1 02/10

Bluetooth Communication

The meter includes a Bluetooth module designed to communicate with the Flir T/B360,

T/B400 or i/b60 cameras The combination of a clamp meter and an IR camera is used for

analysis and documentation of temperature and current readings on single and three

phase power distribution panels.

Setup

1. Enable the EX485 bluetooth by pressing and holding the side Bluetooth/Backlight

button for two seconds. On the second beep the bluetooth icon will appear in the

display.

2. Pair the meter to the camera by following the “Pairing Bluetooth devices” section in

the camera manual.

3. Once paired, the data from the EX485 will be continuously displayed and updated on

the camera display.

Notes:

1. More than one meter can be paired with one camera to observe multiple legs in three

phase systems.

2. If a paired bluetooth device is removed from a camera list, perform a camera restore.

3. During initialization it can take up to 15 seconds to establish communication and

display results.

4. The data transmit function works in IR, Picture in Picture and Fusion modes, it does

not work in Digital camera mode.

5. If data stops appearing in the display, check that the bluetooth icon is active on the

meter’s display.

Image Editing

A single or series of readings can be applied to a single image by saving and entering the

image edit mode.

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