Omega HHM21 Manual de usuario
OMEGA
HHM21
Digital Multimeter
OMEGAnetSM On-Line Service
http://www.omega.com
Internet e-mail
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omega.com
TM
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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification
of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for any errors it contains,
and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected application.
1
SAFETY INFORMATION
The following safety information must be observed to insure maximum
personal safety during the operation at this meter:
1. Do not use the meter if the meter or test leads look damaged, or if you
suspect that the meter is not operating properly.
2.Thismeterisnotrecommendedforhighvoltageindustrialuse;forexample,
not for measurements of 440 VAC or 600 VAC industrial power mains. The
unit is intended for use with low energy circuits to 600VDC or AC or high
energy circuit to 250 VAC or DC. Accidental misuse by connection across
a high voltage, high energy power source when the meter is set up for mA
measurement may be very hazardous.
3. Turn off power to the circuit under test before cutting, unsoldering, or
breaking the circuit. Small amounts of current can be dangerous.
4.Usecautionwhenworkingabove60Vdcor30Vacrms.Suchvoltagespose
a shock hazard.
5. When Using the probes, keep your fingers behind the finger guards on the
probes.
6.Measuring voltagewhichexceedsthelimitsofthemultimetermaydamage
themeterandexposetheoperatortoashockhazard.Alwaysrecognizethe
meter voltage limits as stated on the front of the meter.
7.Ifthe equipmentisused inamanner notspecifiedby themanufacturer,the
protection provided the equipment may be impaired.
2
SPECIFICATIONS
Display: Liquid crystal display (LCD) with a maximum reading of 4300.
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: "1 OL"or "-1 OL" is displayed.
Lowbatteryindication: the" "isdisplayedwhenthebatteryvoltagedrops
below the operating level.
Measurement rate: 2.5 times per second, nominal.
Operating Environment: 0°C to 40°C at < 70% relative humidity.
Storage Temperature: -20°C to 60°C, 0 to 80% R.H. with battery removed
from meter.
Accuracy: Stated accuracy at 23°C ± 5°C, <75% relative humidity.
Safety: According to EN61010-1 protection class II overvoltage category
(CAT II 600V) pollution degree 2.
Auto Power off: 30minutes after rotary switch and push button no changes.
(except MAX/MIN function)
Power: single standard 9-volt battery.
Battery life: 200 hours typical.
Dimensions: 192mm (H) x 91mm (W) x 52.5mm (D).
Weight: 365g including battery.
Accessories: One pair test leads, One spare fuse installed, 9V battery and
Operating Instructions.
3
DC VOLTS
Ranges: 430mV,4.3V,43V, 430V,600V
Resolution: 100µV
Accuracy: ±(0.25%rdg + 1dgt)
Input impedance: >10MW
Overload protection: 600VDC or AC rms
AC VOLTS (50Hz - 2KHz)
Ranges: 430mV,4.3V,43V,430V,600V
Resolution: 100µV
Accuracy:
Input impedance: >10MW
Overload protection: 600VDC or AC rms
Range 50Hz-100Hz 100Hz-500Hz 500Hz-2KHz
430mV ±(1.5%rdg+3dgts) N/A
4.3V N/A
43V
430V
600V ±(1.5%rdg+3dgts)
±(0.75%rdg+2dgts)
4
DC CURRENT
Ranges: 430µA,43mA,430mA,10A
Resolution: 100nA
Accuracy: ±(0.5%rdg + 1dgt) on µA,mA ranges
±(2.0%rdg + 1dgt) on 10A range
Burden voltage: 1.4V on all ranges, execpt
1.5V on 10A range
Input protection:0.5A / 250V fast blow ceramic fuse
10A / 600V fast blow ceramic fuse
AC CURRENT (50Hz - 1KHz)
Ranges: 430µA,43mA,430mA,10A
Resolution: 100nA
Accuracy: ±(1.0%rdg + 2dgts) on µA,mA ranges
±(2.5%rdg + 2dgts) on 10A range
Burden voltage: 1.4V on all ranges, execpt
1.5V on 10A range
Input protection:0.5A / 250V fast blow ceramic fuse
10A / 600V fast blow ceramic fuse
RESISTANCE
Ranges: 430W,4.3KW,43KW,430KW,4300KW,43MW
Resolution: 100mW
Accuracy: ±(0.3%rdg + 3dgts) on 430Wrange
±(0.3%rdg + 2dgts) on 4.3KWto 4300KWranges
±(1.5%rdg + 4dgts) on 43MWrange
Audible indication: <50W±30W
Open circuit volts: 0.4Vdc
Overload protection: 500VDC or AC rms
5
CONTINUITY
Audible indication: <50W±30W
Overload protection: 500VDC or AC rms
DIODE TEST
Accuracy: ±(3.0%rdg + 3dgts)
Resolution: 1mV
Test current: 1.0±0.6mA
Test voltage: <3.5V
TEMPERATURE
Ranges: -20°C to 1300°C
-4°F to -2372°F
Resolution: 1°C, 2°F
Accuracy: ±(2.0%rdg + 3dgts) on -20°C to 500°C
±(3.0%rdg + 2dgts) on 500°C to 1300°C
±(2.0%rdg + 6dgts) on -4°F to 932°F
±(3.0%rdg + 4dgts) on 932°F to 2372°F
6
OPERATION
Before taking any measurements, read the Safety Information Section.
Always examine the instrument for damage, contamination (excessive dirt,
grease, etc.) and defects. Examine the test leads for cracked or frayed
insulation. If any abnormal conditions exist do not attempt to make any
measurements.
RANGE Button
Press (RANGE) button to select the Manual Range mode and turn off the
"AUTO" annunciator.
In the Manual Range mode. each time you press (RANGE) button, the range
(and the input range annunciator) increments, and a new value is displayed.
To exit the Manual Range mode and return to autoranging, press and hold
down(RANGE)buttonfor2seconds.The"AUTO"annunciatorturnsbackon.
MAX/MIN Button
Press(MAX/MIN)toentertheMAXMINAVGRecordingmode(manualrange
only).TheRECORDannuciatorturnsonandtheautomaticpower-off feature
is disabled.
Push (MAX/MIN) to cycle through the maximum(MAX), minimum(MIN),
average(AVG)andpresentreadings.(AVG)isaveragelasttentimesreading
can be displayed. Press and hold down the (MAX/MIN) for 2 seconds to exit
and erase recorded reading.
7
A-H Button
In Auto hold mode, the meter will capture and hold the first stable non-
zero(>100digits)readingafter a zero reading(<100 digits). Severalconsecu-
tive measurements can be held and displayed without pressing the (A-H)
buttion. Simply by shorting the test leads together between measurements.
Press (A-H) to toggle in and out of the Auto Hold mode.
In the Auto Hold mode, the A-H annunciator is displayed.
RELDD
DD
DButton
Press (RELDD
DD
D) to enter the Relative mode, zero the display, and store the
displayed reading as a reference value. The relative mode annunciator(DD
DD
D) is
displayed.
Press (RELDD
DD
D) again to exit the relative mode.
DD
DD
DSET Button
The Relative value can also be changed by the user.
Toset theRelativevalue ,press the (DD
DD
DSET) toenter the DD
DD
DSETmode,relative
valueenterviayellowbuttons(+/-4300).Thenpressthe(DD
DD
DSET)button,store
the reference value.
Press(RELDD
DD
D)toentertheRelativemode,thenpress(DD
DD
DSET)toenterRelative
set value as a referance value.
8
TIME Button
Press (TIME) to enter elapsed-time mode.
Push (TIME) to cycle through the Minutes and seconds, hours and minuates.
Press and hold down the (TIME) for 2 seconds to exit TIME mode.
Voltage Measurements
1. Connect the red test lead to the "VW" jack and the black test lead to the
"COM" jack.
2. Set the Function/Range switch to the desired voltage function.
3. Connect the test leads to the device or circuit being measured.
4.Fordc,a(-)signisdisplayedfornegativepolarity;positivepolarityisimplied.
Current Measurements
1. Set the Function/Range switch to the desired current range and press the
A toggle button to select AC or DC.
2.Forcurrentmeasurementslessthan430mA,connecttheredtestleadtothe
µAmA jack and the black test lead to the COM jack.
3. For current measurements of 430mA or greater, connect the red test lead
to the 10A jack and the black test lead to the COM jack.
4. Remove power from the circuit under test and open the normal circuit path
wherethemeasurementistobetaken.Connectthemeterinserieswiththe
circuit.
5.Usecautionwhenmeasuring10ampson10Arangefor60s,pleasewaiting
for 10 minutes for next measurement of 10 amps for safety reason.
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