Extech 382860 Instruction Manual
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.
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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
DC/AC : 20A
Current
Operating
Conditions
Storage
Conditions
0 to 104
0 to 122
o
F (0 to 40°C), relative humidity: <75%, not wetting
o
F (-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
DC Voltage
400 mV
± (0.3% + 1dgt)
100 µV
4 V 1 mV
40 V 10 mV
400 V
100 mV
1000 V ± (0.5% + 1dgt) 1 V
DC Current
400 µA 0.1µA
4mA
40mA
400mA
4A 1mA
20A
± (1.0% + 1dgt)
± (0.8% + 1dgt)
± (1.5% + 5dgt)
1 µA
10 µA
100µA
10mA
Accuracy Mode Measuring Range
Resolution
40Hz-1KHz 1KHz–10KHz
AC Voltage
400 mV 0.1mV
± (0.8%+3dgts) ± (2.5%+5dgts)
4 V 1mV
40 V 10mV
AC Current
400 V(<200V)
400V(<400V) 100mV
± (1.0%+3dgts) N/A
750 V
400 µA 0.1µA
± (1.5%+3dgts)
± (2.5%+5dgts)
4mA
40mA
400mA
4A
N/A
20A ± (2.0%+5dgts)
100mV
1V
1µA
10µA
100µA
1mA
10mA
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Mode Measuring
Accuracy Resolution
Range
Frequency
(Sensitivity:>300mVrms)
4kHz 1Hz
± (0.1% + 2dgts)
40kHz 10Hz
400kHz 100Hz
4MHz 1kHz
Temperature
40MHz
-40°C to 200°C ± (3%+5dgts)
10kHz
1°C
+200°C to 1200°C ± (3%+2dgts)
Mode Range Accuracy Resolution
Resistance
400Ω 0.1Ω
4k Ω
± (0.5% + 1dgts)
1Ω
40k Ω 10Ω
400k Ω 100Ω
Capacitance
4M Ω
40M Ω
4nF 1pF
± (1% + 2dgts)
±2.0 (rdg + 2digits)
1kΩ
10kΩ
40nF 10pF
400nF 100pF
4uF 1nF
40uF 10nF
400uF
Diode Test Range 0 to 2000mV, Test current 1.5mA
100nF
1mV
max. at 1 k ohm, Forward Voltage max. 2.0V
Continuity Check 400 Ohm; Audible tone < approx. 40 Ohm
Mode Measuring Range Accuracy
Power Measurements
AC Current
AC Voltage
True Power
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.
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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 (IEC1010-2).
• 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.
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• To avoid an electrical shock, don’t touch directly or indirectly the test probes and the test
WARNING
CAUTION
MAX
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
500V
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.
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