Extech Instruments EX845 Manuale utente

User's Guide

Bluetooth Series 1000 Amp Clamp Meters with IR Thermometer

AC/DC True RMS Clamp meter

Patented

Introduction

1000A True RMS AC/DC Current Clamp models measure:

Infrared Temperature

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.

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.

•Bluetooth

UL Note

A UL mark does not indicate that this product has been evaluated for accuracy.

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.

Function Maximum Input

A AC, A DC 1000A DC/AC

V DC, V AC 600V DC/AC

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

Type K Temperature 60V DC, 24V AC

Description

eter Description

1. Current clamp

2. Clamp opening trigger

3. Data Hold Button

4. Mode

5. Peak

6. Range

7. DCA Zero

8. MIN/MAX

9. Backlit LCD Display

10. Test lead input jacks

11. IR thermometer and laser pointer (rear)

12. Backlight /BT active / Store trigger 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 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)

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

BT active

Specifications

Function Range & Resolution Accuracy (% of reading + digits)

400.0 AAC ± (2.5% + 8d)

AC Current

50/60 Hz

True RMS 1000 AAC ± (2.8% + 5d)

400.0 ADC ± (2.5% + 5d)

DC Current 1000 ADC ± (2.8% + 5d)

400.0 mVAC ± (1.0% + 10d)

4.000 VAC

40.00 VAC

400.0 VAC

± (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 to 400Hz); 5V (401Hz to 4000Hz)

Function Range and Resolution Accuracy (% of reading + digits)

-4 to 1400oF ± (3%rdg + 9oF)

Temperature

(type-K) -20 to 760oC ± (3%rdg + 5oC)

-58 to -4°F ±9 °F

-4 to 518°F ±2.0% reading or ±4°F whichever is >

-50 to -20°C ±5°C

Temp (IR)

-20 to 270°C ±2.0% reading or ±2°C

General Specifications

Clamp jaw opening 1.7" (43mm) approx.

Display 3-3/4 digits (4000 counts) backlit LCD

Continuity check Threshold 40Ω; Test current < 0.5mA

Diode test Test current of 0.3mA typical;

Open circuit voltage < 3VDC typical

Low Battery indication Battery symbol is displayed

Over-range indication ‘OL’ display

Measurement rate 2 readings per second, nominal

PEAK Captures peaks >1ms

Thermocouple sensor Type K 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 Humidity Max 80% up to 87°F (31°C) decreasing linearly to 50% at 104°F(40°C)

Storage Humidity <80%

Operating Altitude 7000ft. (2000meters) maximum.

Battery One (1) 9V Battery (NEDA 1604)

Auto power OFF After approx. 25 minutes

Dimensions & Weight 10.6x4.3x2” (270x110x50mm); 13.6 oz. (386g)

Safety For indoor use and in accordance with the requirements for double insulation

to IEC1010-1 (2001): EN61010-1 (2001) Overvoltage Category III 600V and

Category II 1000V, Pollution Degree 2.

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/DC 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 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 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 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.

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 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

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

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.

8”

3”

1”

4”

24”

0.5”

(10cm)

(1.25cm)

(20cm)

(2.5cm)

(60cm)

(7.5cm)

Distance to object

Diameter of spot

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.

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