Extech Instruments 382860 Manuale utente

1382860 Ver. 1.5 2/01

Instruction Manual

MODEL 382860

True RMS Power MultiMeter

1. INTRODUCTION

Congratulations on your purchase of the Extech Model 382860 True RMS Power MultiMeter.

Four LCD displays offer four simultaneous readings e.g. during “POWER” measurements,

simultaneous displays of power, current, AC voltage and power factor can be viewed; AUTO

RANGE always selects the correct measuring range to achieve best accuracy; REL

(Relative) function allows the operator to measure a value with respect to a preset reference

value; CMP (Comparator) function allows a comparative measurement to be made (the

upper/lower limits can be defined); MEM (Memory) and RCL (Recall) functions permit 10

measurements to be stored in memory for later recall; AUTO-POWER-OFF extends the life of

the battery by turning off the meter if neither the rotary function switch nor any button is

operated for 12 minutes. The AC Adaptor required for Power measurements is included.

2382860 Ver. 1.5 2/01

2. SPECIFICATIONS

2.1 General Specifications

Display One Main and three Sub 3-3/4-digit (3999 count) LCDs plus 40-

segment bargraph

Max. Input

Current DC/AC : 20A

Operating

Conditions 0 to 104oF (0 to 40°C), relative humidity: <75%, not wetting

Storage

Conditions 0 to 122oF (-10 to 50°C), relative humidity: <76%, not wetting

Power 9V Battery: NEDA 1604 9 V or 6F22

Dimensions 7.36x3.3x1.34” (187x84x34mm)

Weight 9.8oz (305g)

2.2 Range Specifications

NOTES: Accuracies are % of reading and specified at 23oC with RH <75%

for a period of 1 year after production. Warm-up time is 1 minute.

Mode Measuring Range Accuracy Resolution

400 mV 100 µV

4 V 1 mV

40 V 10 mV

400 V

± (0.3% + 1dgt)

100 mV

DC Voltage

1000 V ± (0.5% + 1dgt) 1 V

400 µA0.1µA

4mA ± (1.0% + 1dgt)

1 µA

40mA 10 µA

400mA ± (0.8% + 1dgt)

100µA

4A 1mA

DC Current

20A

± (1.5% + 5dgt)

10mA

AccuracyMode Measuring Range 40Hz-1KHz 1KHz–10KHz Resolution

400 mV 0.1mV

4 V 1mV

40 V 10mV

400 V(<200V)

± (0.8%+3dgts) ± (2.5%+5dgts)

100mV

400V(<400V) 100mV

AC Voltage

750 V

± (1.0%+3dgts) N/A

400 µA0.1µA

4mA 1µA

40mA 10µA

400mA

± (2.5%+5dgts)

100µA

± (1.5%+3dgts)

1mA

AC Current

20A ± (2.0%+5dgts)

N/A

10mA

3382860 Ver. 1.5 2/01

Mode Measuring

Range Accuracy Resolution

4kHz 1Hz

40kHz 10Hz

400kHz 100Hz

4MHz 1kHz

Frequency

(Sensitivity:>300mVrms)

40MHz

± (0.1% + 2dgts)

10kHz

Temperature -40°C to 200°C ± (3%+5dgts)

+200°C to 1200°C ± (3%+2dgts)

1°C

Mode Range Accuracy Resolution

400Ω0.1Ω

4k Ω 1Ω

40k Ω 10Ω

400k Ω 100Ω

4M Ω

± (0.5% + 1dgts)

1kΩ

Resistance

40M Ω ± (1% + 2dgts) 10kΩ

4nF 1pF

40nF 10pF

400nF 100pF

4uF 1nF

40uF 10nF

Capacitance

400uF

±2.0 (rdg + 2digits)

100nF

Diode Test Range 0 to 2000mV, Test current 1.5mA

max. at 1 k ohm, Forward Voltage max. 2.0V 1mV

Continuity Check 400 Ohm; Audible tone < approx. 40 Ohm

Mode Measuring Range Accuracy

Power Measurements

AC Current

AC Voltage

True Power

Phase angle (cosine)

To 16 A

91 to 120V

To 100 W

To 4000 W

-90 to 90 degrees

+/-(2%+5dgts)

+/-(3%+3dgts)

+/-(5%+10dgts)

+/-(2%+5dgts)

Power Factor 00.00 to 1.00

2.3 Overload Protection

•400mA AC/DC in the mA -range

•Resistance Measurement: 40 Mohm overload; Protection : 250 V DC/AC rms

•Frequency Measurement : 40MHz with max 750V DC/AC rms input voltage

•Diode Test/Continuity Test : overload protection : 250 VDC/VAC rms

•Logic Test : max. 39.99 VDC overload protection 250 VDC/VAC rms

Attention: Transistor, capacitance and temperature measurements are not

overload protected. Exceeding the max. input limits can be hazardous to

the user and can damage the meter.

4382860 Ver. 1.5 2/01

3. METER DESCRIPTION

Function Keys:

•Power ON/OFF Key

•FUNCTION Select Key

•Set/Reset Key

•AC/DC Ohm/Continuity Key

•UP Key

•DOWN Key

•Backlight Adjust Button

Input Terminals

•20-A Input Socket

•mA -input

•COM Socket (-Terminal)

•V-ohm Socket (+ Terminal)

4. Safety Notes

•The multimeter is EMC-tested and corresponds to the following EG-standard:

89/336/EWG

•This unit is constructed and checked according to DIN 57 41 Part 1/VDE 0411 Part 1,

Safety Requirement for Electronic Measuring Units and Over-voltage Category II (IEC-

1010-2).

•This multimeter may only be used in fuse lines which are protected to 15A. The voltage

must not exceed 250 VDC/VAC and the maximum load must not exceed 4000 VA.

Installations in the overload range III according to ICE 664 are not permitted. The unit

and the measuring cables are not protected against arcing (IEC 1010-2-031, section

13.101).

•If covers are opened, voltage-carrying components may be accessible. Terminals can

also carry voltage. If it is necessary to open the unit for adjustment, maintenance,

repairing or exchange of parts or modules, the measuring unit has to be removed from

all voltage sources

•Capacitors can still carry voltage, even if the unit has been removed from all voltage

sources.

•Please make sure to use new fuses of the proper rating. Do not use repaired fuses and

do not bridge the fuse holders.

•Use special caution when working with voltages above 25V (AC) and 35 V(DC). Such

voltage may cause a hazardous electrical shock if electrical conductors are physically

touched.

•Make sure before each voltage measurement that the unit is not set to the ampere

range.

•Before changing the measurement range, remove the probe tips from the object to be

measured.

•Before each measurement, check the meter and test leads to make sure they are not

damaged.

•Do not use the meter in areas with adverse environmental conditions or where

flammable gas, steam or dust may exist. For your own safety, avoid getting the meter

and test leads damp or wet.

5382860 Ver. 1.5 2/01

•To avoid an electrical shock, don’t touch directly or indirectly the test probes and the test

points during measurement.

•To avoid serious electrical shock and/or instrument damage, do not apply more than 500

VDC/VAC rms between any meter input terminal and earth ground.

•Do not use meter near strong magnetic fields (loudspeakers, magnets), electromagnetic

fields (transformers, motors, coils, relays, contactors, electromagnets etc.), electrostatic

fields (charge/discharge), and Transmission antennas or HF-generators.

•Don’t switch on the measuring unit immediately after bringing it in from a cold to warm

room. Condensed water might impair or destroy your unit. Give the unit time to warm up

to room temperature before switching it on.

•Safe meter operation is questionable if the unit shows visible damage, the unit does not

appear to work properly, or long-term storage under unfavorable conditions has taken

place.

•For measurements, use only test-leads which are supplied with the meter or equivalent

types. The supplied test-leads are rated for a maximum of 1200V. The maximum rating

of the multimeter is 1000 VDC max or 750 VAC rms. Use special caution when working

with voltage above 25 V AC and above 35 V DC.

SAFETY SYMBOLS

This symbol adjacent to another symbol, terminal or operating device

indicates that the operator must refer to an explanation in the Operating

Instructions to avoid personal injury or damage to the meter.

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 in minor or moderate injury, or damage to the

product or other property.

This symbol advises the user that the terminal(s) so marked must not be

connected to a circuit point at which the voltage, with respect to earth

ground, exceeds the referenced VAC or VDC.

This symbol adjacent to one or more terminals identifies them as being

associated with ranges that may, in normal use, be subjected to particularly

hazardous voltages. For maximum safety, thermometer and its test leads

should not be handled when these terminals are energized.

WARNING

CAUTION

MAX

500V

6382860 Ver. 1.5 2/01

5. BASIC METER OPERATION

5.1 Quick Start

•Connect the test leads to the meter

•Press the “ON/OFF” key to power the meter.

•Turn the rotary function switch to the desired measurement position. The

meter is now ready for “normal” measurement operation.

•To select an advanced function, press the FUNCTION key. The available

functions will appear on the top of the LCD display. Press FUNCTION again to

scroll through this function list. Press the SET/RESET key to select an

advanced function. These functions are explained in detail in Section 5.4

•To exit this menu, press the SET/RESET key twice (in some of the modes you

may have to press the FUNCTION key after the two SET/RESET key

presses).

5.2 Function Key Explanations

•ON/OFF Key: Press the “ON/OFF” key to toggle the meter ON and OFF

•FUNCTION Key: Press once to enter the advanced function menu. The

user can then select Data Hold DH, Range Hold RH, Auto Hold AH, Relative

REL, Memory MEM, Recall RCL, and Compare CMP functions. Each

function is explained in detail in Section 5.4.

•SET/RESET: Used for advanced features explained in Section 5.4.

•DC/AC Ohms/Continuity Key: Press this key to: Toggle between DC/AC

units and switch from resistance measurement to audible continuity check

modes

•UP/DOWN Keys: Used to:

1. Enter reference values in the REL or CMP modes

2. Address stored values in the MEM and RCL modes

3. Manually set the measurement range in the R-H function mode

4. Scroll through advanced Functions list (UP=forward,

DOWN=backward)

•BACKLIGHT ADJUST Key (circular, blue-colored button):Press this key

to deepen the LCD backlight effect. The backlight extinguishes after a 15-

second period of non-use to save battery life and illuminates again when a

keypress is sensed by the meter.

5.3 Input Terminal Designations

•Transistor Socket hFE (PNP NPN)

This terminal, located to the right of the Rotary Selector Switch, is where

transistor devices are inserted for testing. The eight pole transistor terminal is

lettered symmetrically with (E) Emitter, (B) Base, and (C) Collector. Insert the

transistor pins according to transistor type. Remember to remove any voltage

to components before measuring.

•Multi-Purpose Capacitor/Temperature Input Socket PLUS CMOS Signal

Output

This socket is located to the left of the Rotary Selector Switch. Discharged

capacitors and Type K temperature probes to be measured are inserted in

here. Observe correct polarity. The CMOS output signals are also available

here (see Section 8).

•20A Input Terminal

For DC/AC current measurements to 20A max, insert the Red test-lead to this

input socket.

Attention: During current measurements the rotary switch must not be set to

voltage positions.

7382860 Ver. 1.5 2/01

•mA-Measuring Socket

For DC/AC mA current measurements below 400mA, insert the Red test-lead

to this terminal.

•COM (Common or Negative Input Terminal

For all measurements, except capacitance, temperature and transistor

measurements, the Black test lead is connected here

•V/Ohm-Socket

For measurements of voltage, frequency, resistance, continuity, diode and

logic, insert the Red test lead into this terminal.

5.4 Advanced Function Information

•Analog Bargraph: The Bargraph consists of 43 segments and responds faster

than the LCD. If the meter’s measuring range is exceeded, “OL” is displayed on the

LCD and the Bargraph segments will flash. An audible warning tone will sound for

all functions except resistance, diode, and temperature in an overload condition.

•Data-Hold “D-H”: In this mode, you can freeze a reading in the center sub-LCD

display. Press the FUNCTION key then the SET/RESET keys to activate Data

Hold. The center sub-display will indicate the held reading. Press SET/RESET

again to freeze a new reading. Press the FUNCTION key to exit the Data Hold

mode.

•Range Hold “R-H”: Press the FUNCTION key twice then the SET/RESET key

once to access this mode. This function allows the user to switch off automatic

range selection (Auto Range) and set the measuring range manually. Each time

the UP or DOWN button is pressed, the decimal point is moved one position to the

left or to the right, the units of measure are changed respectively (e.g. from KHz to

MHz during frequency measurement). To return from this function mode, press the

SET/RESET key.

•Auto Hold A-H: In this function, the meter will automatically record the

MIN/MAX/AVG readings taken since this mode was accessed. These values are

continuously updated. To access A-H, press the FUNCTION key three times. Then

press the SET/RESET key once. Use the UP and DOWN keys to select the

decimal location for the MIN/MAX/AVG readings. If you fixed the range using

Range Hold R-H (explained above), press the SET/RESET key once again. The

MIN-value is shown on the left sub-display, the MAX-value on the right sub-display,

and the AVG on the center sub-display. Press SET/RESET key to return to normal

meter operation.

•REL(Relative): The relative mode enables the operator to compare a pre-set

reference value (displayed in the right-most sub-LCD) to subsequent readings.

Press the FUNCTION key four times and then press the SET/RESET Key once.

Set the polarity of the reference value via the UP/DOWN keys. Press the

SET/RESET key when polarity is set. Use the UP/DOWN keys to set the desired

reference value and its decimal point (use the SET/RESET key to move through

the digits. When a digit is flashing it is ready to be changed via the UP/DOWN

keys. Press the SET/RESET key repeatedly until the digits cease flashing when

editing is complete. Press the SET/RESET key once more and the meter’s center

sub-LCD will now display the difference (offset) between the stored reference value

and the actual readings, while the present (actual) measurement displays on the

Main LCD. The left sub-display will show the difference in % and the right sub-

display will continue to show the preset reference value.

8382860 Ver. 1.5 2/01

•MEM (Memory): Up to 10 measurements (0 to 9) can be stored and recalled.

Press the FUNCTION key five times then press the SET/RESET key once to store

the present measurement value in the first available memory location. The memory

location number will flash to the upper left of the left-most sub-LCD. The

memorized reading is shown on the center sub-LCD. Use the UP/DOWN keys to

scroll to the next free memory location. Take another measurement and press the

SET/RESET key to store it. If a memory location number which has been used

before is selected, the previous value is updated (erased) with the new

measurement value. If you accidentally exit the function mode by pressing the

SET/RESET key too many times, the memory is not erased. It can be “recalled”

using the RECALL function which follows…

•RCL(Recall): This function recalls memorized readings to the LCD. Press the

FUNCTION key 6 times until the RCL icon flashes. Press the SET/RESET key

once. The memory location reference number flashes to the upper left of the left-

most sub-LCD. Press the UP or Down keys to select a memory address (a number

from 0-9 where the measurement has been stored). Press the SET/RESET key

again to recall the reading memorized in the selected location. The recalled value

(ref. No. 0) will appear on the left sub-display; the 2nd recalled value (ref. No. 1)

appears on the center sub-display and the 3rd recalled value (ref. No. 2) appears on

the right side sub-display, and so on for the remaining locations.

•CMP (Comparison): Comparison mode allows readings to be compared to user

programmable High/Low setpoints. Press the FUNCTION key and then the DOWN

key. Press the SET/RESET key once and the word “LOW” should begin flashing

above the left-most sub-LCD. Press the SET/RESET to begin editing the LOW user

setpoint. Use the SET/RESET key to move from digit to digit and use the

UP/DOWN keys to change a digit’s value. When done, press the SET/RESET key

until the LOW setpoint value ceases flashing. The word “HIGH” will begin flashing

over the right-most sub-LCD. Edit the HIGH setpoint in the same manner as the

LOW setpoint. After both reference values have been defined press the

SET/RESET key again. The R-H (Range Hold) icon will begin flashing. Set the

measurement range via the UP/DOWN keys. On the center sub-display “LO”

appears for readings less than the low reference value, “Hi” is displayed for

readings higher than the highest reference value, and “Pass” is displayed for

readings in the region between the low and high reference values. To exit CMP

mode, press the FUNCTION key.

•AUTO-POWER-OFF extends the life of the battery: if neither the rotary function

switch nor any button is operated for 12 minutes the DMM is automatically turned

off. During active “communication” of the multimeter with a PC, AUTO-POWER-

OFF is disabled.

9382860 Ver. 1.5 2/01

6. MEASUREMENT INSTRUCTIONS

6.1 Voltage AC/DC Measurements (True RMS for AC Voltage)

Attention: Never exceed the maximum input limits (1000VDC or 750 VAC

rms).Keep hands away from circuits where 25 VAC rms or 35 VDC exists.

To measure DC / AC voltage proceed as follows:

1. Set the rotary function switch to the desired position (mV or V)

2. Press the DC/AC key until the desired units are displayed (AC or DC).

3. Connect the test-lead tips to the object under test (load, circuit etc.)

4. Read the LCD

AC / DC Voltage Displays

During True RMS AC voltage measurements, the right-most sub-LCD display will

show the dB-value of the AC voltage, the middle sub-display shows the frequency

and the main display the ACV measurement. During DC voltage measurements,

the left sub-display updates the measurement 1 second later than the Main LCD,

the middle sub-display 2 seconds later, and the right sub-display 3 seconds later.

6.2 AC / DC Current Measurements (True RMS AC Current)

1. Select the desired Current range via the rotary switch (4 mA / 400 mA / 20 A).

2. Press the DC/AC button to select AC or DC Current units

3. “Break” the circuit to be measured and connect the test-leads in series with

circuit under test.

4. Power the device to be measured (circuit load etc.) and read the current on

the LCD. During AC current measurements, the middle sub-display will show

the frequency of the measurement and the main display indicates the current

measurement.

5. During DC current measurements, the left-most sub-display is updated one

second later than the main LCD. The middle sub-display two seconds later

and the right sub-LCD three seconds later.

Attention: Never measure current in circuits where over 250 VDC/VACrms may be

present. The meter fuses are designed for 250 V max. Measure circuits in which

15A fuse protection is provided only. Never measure circuits where Power

exceeds 4000 VA. Current measurements of 20A may only be taken for 30

seconds at 15 minute intervals (DO NOT exceed 20A).

6.3 Continuity Test

Continuity is a low resistance test permitting the testing of fuses, bulbs, test leads,

cable, circuits, etc. Set the rotary switch to the Ohm position and press the DC

Ohm/AC button until the music symbol displays. Connect the test-lead tips to the

device under test. If the resistance is < approx. 40ohms an audible tone sounds.

The left sub-LCD updates one second later than the main LCD, the middle sub-

display 2 seconds later, and the right-most sub-display 3 seconds later.

6.4 Resistance Measurements

Attention: Make sure all objects, circuits and

components under test are NOT powered!

1. Set the rotary switch to the Ohms position. Press the AC/DC key so that the

continuity musical symbol does NOT appear on the LCD.

10 382860 Ver. 1.5 2/01

2. Connect the test-leads to the device under test. Ensure that all power is

removed from devices under test. Auto Range selects the appropriate range

automatically.

3. Normally the resistance of the test-leads can be disregarded (approx. 0.1 to

0.2 Ohm). However, this small value can cause inaccuracy in the 400 Ohm

range. To determine the error before measurement, short the test-lead tips

and read the resistance value on the display. Subtract this value from

readings to cancel lead resistance errors.

4. During resistance tests, make sure that the contact between test leads and

circuits is optimized. Make sure the test points are free of dirt, oil or solder

flux, etc. since these may seriously influence the measurement.

5. For resistance measurements >4M, the display will take several seconds to

stabilize.

6. The left-most sub-LCD updates one second later than the main LCD, the

middle sub-display 2 seconds later and the right-most sub-display 3 seconds

later.

6.5 Diode Test

Attention: During diode tests, ensure that components and circuits under test are NOT

powered. All existing capacities must be discharged.

1. Set the Rotary Switch to the diode symbol position. The diode icon will be

displayed. Manual range selection is not possible during diode tests.

2. Connect the test-lead tips to the object under test. The RED probe-tip

connects to the anode of the device under test and the BLACK test-lead tip

connects to the cathode.

3. A diode’s forward voltage should measure approx. 0.25 V (Germanium) or 0.7

V (Silicon), if the diode is GOOD.

4. Reverse the probe-tips (Red to the cathode and Black to the anode) to check

the diode’s reverse status.

5. If “OL” (overload) is displayed, the diode is open or measures above 2.0 V. If

a value between 0 V and approx. 2.0 is displayed, then a good forward

voltage drop exists.

6. During diode tests the center sub-display indicates GOOD if the diode is o.k.

If the diode is defective (short circuit) or low resistance short then SHORT is

displayed. If the diode is defective due to high resistance or if the test leads

are accidentally reversed (red to cathode and black to the anode) then

“OPEN” for (open circuit) is displayed.

NOTE: Checking LED components in Diode Test mode

The meter’s test voltage in diode test mode is sufficient to “illuminate” most

(low current) LEDs. If the LED has an operating voltage of more than 2.0 V,

the meter will falsely indicate that the LED is defective when it actually may be

good.

6.6 Frequency Measurement

Attention: Observe the max. input limits. Never connect voltages over 750 VDC/VAC

rms. It is hazardous to touch the terminals or probe tips when measuring voltages >

25VAC/35 VDC. Disconnect the test-leads from the contact points when measuring

voltage (over 25 VAC or 35 VDC) and before changing the meter function and range

1. Set the rotary function switch to the “FREQ” position and insert the test leads

to the meter

2. Connect the test-lead tips to the frequency source under test (generator, etc.).

For the best accuracy, the use of BNC-Cables is strongly recommended.

During frequency measurements, the right sub-display shows the dB-value of

the AC voltage, the middle sub-display shows the AC voltage “V” and the

main display: the present input value (frequency).

Indice

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