Omega HHM27 User manual
OMEGA
HHM27
Digital Multimeter
OMEGAnetSM On-Line Service
http://www.omega.com
Internet e-mail
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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 voltagewhichexceedsthelimits ofthemultimetermay damage
themeterandexposetheoperatortoashockhazard.Alwaysrecognizethe
meter voltage limits as stated on the front of the meter.
7.Ifthe equipment is used in a manner not specifiedbythemanufacturer, the
protection provided the equipment may be impaired.
2
SPECIFICATIONS
Display: Liquid crystal display (LCD) with a maximum reading of 2500.
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: "OL"or "-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.
AutoPoweroff:30minutesafterrotaryswitchandpushbuttonnochanges.turn
the meter off then on to resume operation.
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: 250mV,2.5V,25V,250V,600V
Resolution: 100µV
Accuracy: ±(0.25%rdg + 5dgt) on 250mV range
±(0.25%rdg + 1dgt) on other ranges
Input impedance: >10MW
Overload protection: 600VDC or AC rms
AC VOLTS (50Hz - 500Hz)
Ranges: 250mV,2.5V,25V,250V,600V
Resolution: 1mV.(100µA on 250mV range)
Accuracy: ±(0.75% of reading + 4dgts) on 2.5V to 600V
no specification on 250mV range
Input impedance: 10MW
Overload protection: 600VDC or AC rms
DC CURRENT
Ranges: 250µA,2.5mA,25mA,250mA,2.5A,10A
Resolution: 100nA
Accuracy: ±(0.75%rdg + 10dgts) on 250µA,25mA ranges
±(0.75%rdg + 1dgt) on 2.5mA,250mA ranges
±(3.0%rdg + 5dgts) on A range
Burden voltage: 325mV on µA,mA ranges
700mV on A ranges
Input protection: 0.5A / 250V fast blow ceramic fuse
10A / 600V fast blow ceramic fuse
In 250µA, 25mA, 2.5A range use RELDbutton, offset the residual reading
toobtainthe actualcurrent,otherwisethemeasurement errorwouldbe great.
4
AC CURRENT (50Hz - 500Hz)
Ranges: 250µA,2.5mA,25mA,250mA,2.5A,10A
Resolution: 100nA
Accuracy: ±(1.5%rdg + 2dgts) on µA,mA ranges
±(3.0%rdg + 2dgts) on A range
Burden voltage: 325mV on µA,mA ranges
700mV on A ranges
Input protection: 0.5A / 250V fast blow ceramic fuse
10A / 600V fast blow ceramic fuse
RESISTANCE
Ranges: 250W,2.5KW,25KW,250KW,2500KW,25MW
Resolution: 100mW
Accuracy: ±(0.3%rdg + 3dgts) on 250Wrange
±(0.3%rdg + 1dgt) on 2.5KWto 2500KWranges
±(3.5%rdg + 4dgts) on 25MWrange
Open circuit volts: 0.4Vdc
Overload protection: 500VDC or AC rms
CONTINUITY
Audible indication: <100W
Overload protection: 500VDC or AC rms
DIODE TEST
Accuracy: ±(3.0%rdg + 3dgts)
Resolution: 1mV
Test current: 0.5±0.3mA
Test voltage: <1.6V
5
25 MILLI - VOLTS (DC/AC@50Hz - 500Hz)
Resolution: 10µV
Accuracy: ±(1.0%rdg + 10dgt)
Input impedance: >1000MW
Overload protection: 0.5A / 250V fast blow ceramic fuse
CAPACITANCE (Autoranging)
Ranges:2.5nF,25nF,250nF,2.5µF,25µF
Accuracy: ±(10%rdg + 10dgts) on 2.5n Frange(use REL)
±(3.0%rdg + 10dgts) on other ranges
Overload protection: 500VDC or AC rms
FREQUENCY (Autoranging)
Ranges:5.000Hz,50.00Hz,500.0Hz,5.000KHz,50.00KHz,
500.0KHz, 5.000MHz
Resolution: 0.001Hz
Accuracy: ±(0.05%rdg + 2dgts)
Sensitivity: 1.0V rms min on 5.000Hz to 1.000MHz ranges
5.0V rms min above 1.000MHz range
TTL or SINE wave signal on all range
Overload protection: 500VDC or AC rms
DUTY CYCLE (2Hz to 20kHz)
Ranges: 0.1% to 99.9%
Resolution: 0.1%
Accuracy: ±[(0.3 multiplied by the pulse width in kHz)dgt + 2dgts] @ 2V rms
min.
Pulse Width: 500nS
Overload protection: 500VDC or AC rms
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.
Auto Power-down mode
If unused for about 30 minutes, the tester will power-down automatically.
Press RESET button switches to resume power-on mode. If you should
disableAutoPower-down mode,press SELECTbuttom whenyouturnonthe
meter.
SELECT Function Button (DC/AC),(WW
WW
W/ )
The SELECT Function button is Yellow in color. Press it to toggle to the
alternatefunction(AC,Audiblecontinuity,andDiode)showninYellowonthe
meter face.
Hz-% Function Button
Press HZ-% button toggle between frequency and duty cycle mode.
RELDD
DD
DButton
Press (RELD) to enter the Relative mode, zero the display, and store the
displayed reading as a reference value. The relative mode annunciator(D) is
displayed.
Press (RELD) again to exit the relative mode.
7
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"annunciator turnsbackon.
Back-Light and Data-Hold Switch ( >2sec),( H):
Pressthis button briefly to activate DATA-HOLD mode. The "H" annunciator
is displayed.
Pressthisbuttonfor2secondstoturntheBack-Lighton.Asthisalsoactivates
the DATA-HOLD mode, briefly press the button to return to normal display.
The Back-Light will switch-off automatically after about 30 seconds.
RESET Button
Press RESET button to reset or initialize system logic. If you suspect that the
meterisnotoperatingproperlyorthemeterwaspower-down,youcanalways
restart from the begining by press the RESET button.
8
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.
25 MILLI - VOLTS Measurements
1. Connect the red test lead to the "µAmA" 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 (µA,mA,A)
position.
2. To toggle between "DC" and "AC" mode, press SELECT button. The "DC"
or "AC" annunciators is displayed in the upper left corner.
3.Forcurrentmeasurementslessthan250mA,connecttheredtestleadtothe
µAmA jack and the black test lead to the COM jack.
4. For current measurements of 250mA or greater, connect the red test lead
to the A jack and the black test lead to the COM jack.
5. Remove power from the circuit under test and open the normal circuit path
wherethemeasurementistobetaken.Connectthemeterinserieswiththe
circuit.
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