Omega HHM64 User manual
OMEGA
HHM64
Digital Multimeter
OMEGAnetSM On-Line Service
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omega.com
TM
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. This meter is not recommended for high voltage industrial use; for example,
notformeasurementsof440VACor600VACindustrialpowermains.Theunit
is intended for use with low energy circuits to 600V AC/DC or high energy
circuit to 250 VAC or DC.
3. Use caution when working above 60V dc or 30V ac rms. Such voltages pose
a shock hazard.
4. When using the probes, keep your fingers behind the finger guards on the
probes.
5. Measuring voltage which exceeds the limits of the meter may cause damage
and expose the operator to a shock hazard. Always respect the voltage limits
as stated on the meter.
6. If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
1
SPECIFICATIONS
Display: 3½ digit liquid crystal display (LCD) with a maximum reading of 3200.
Analog bar graph: 32 segments with measurements 12 times per second.
Polarity: Automatic, (-) negative polarity indication.
Overrange: "OL" mark indication.
Low battery indication: The " " is displayed when the battery voltage drops
below the operating level.
Auto power-down: After 10 mins, Back-Light after 30 secs approx.
Measurement rate: 2 times per second, nominal.
Operating environment: 0°C to 50°C at <70% relative humidity.
Storage environment: -20°C to 60°C at <80% relative humidity.
Safety: According to EN61010-1 protection class II overvoltage category (CAT
II 600V) pollution degree 2.
Power: 4 pcs 1.5V (AAA size).
Battery life: 500 hours typical.
Dimensions: 170mm (H) x 44mm (W) x 40mm (D).
Weight: 140g including batteries.
2
DC Voltage (50Hz - 400Hz)
Ranges 320mV, 3.2V, 32V, 320V, 600V
Accuracy ±0.25%rdg + 1digit
Input impedance 320mV: >1000MW;
3.2V: 11MW,
32V to 600V: 10MW
Maximum input 600VDC or AC rms
AC Voltage (50Hz - 400Hz)
Ranges 3.2V, 32V, 320V, 600V
Accuracy ±0.75%rdg + 4digits
Input impedance 320mV: >1000MW;
3.2V: 11MW,
32V to 600V: 10MW
Maximum input 600VDC or AC rms
3
4
Resistance (effective reading above 100 digits))
))
)
Ranges 320W, 3.2KW, 32KW, 320KW, 3.2MW, 32MW
Resolution 320W: 0.1W; 3.2KW: 1W; 32KW: 10W;
320KW: 100W; 3.2MW: 1KW; 32MW: 10KW
Accuracy 320W: ±0.3%rdg + 3dgts
3.2KWto 320KW: ±0.3%rdg + 3dgts
3.2MW: ±1.2%rdg + 1dgt
32MW: ±3.0%rdg + 1dgt
Test current 320W: <0.7mA; 3.2KW: <0.13mA; 32KW: <13µA;
320KW: <1.3µA; 3.2MW, 32MW: <0.13µA
Input protection 500VDC or AC rms
Diode Test
Test range 0 - 2.0V
Resolution 1mV
Accuracy ±10%rdg + 3dgts
Test current 0.8mA±0.6mA
Input protection 500VDC or AC rms
5
Continuity beeper
Range 320W
Resolution 0.1W
Audible indication <20W±5W
Test current <0.7mA
Input protection 500VDC or AC rms
OPERATION
Before taking any measurements, read the Safety Information Section.
Always examine the instrument for damage, contamination (excessive dirt,
grease,etc.)anddefects.Examinethetestleadsforcrackedorfrayedinsulation.
If any abnormal conditions exist do not attempt to make any measurements.
Autoranging
The meter defaults to autorange when you turn it on. In autorange, the meter
selects the range automatically.
6
Manually Selecting a Range
The meter also has a manual range mode. In manual range, you select and lock
the meter in a range. To manually select a range:
Press [RANGE] button to hold the selected range. The symbol is displayed.
Subsequently pressing the [RANGE ] button will select each range in sequence
from the lowest to highest range. Hold the button for 2 seconds to return to the
Autorange Mode.
Mode Switch ( ), (W)
Press this switch to toggle between DC and AC in the voltage measurements.
Press this switch to toggle between the W/continuity/diode modes. If the function
switch is set to Wposition.
Back-Light and Data-Hold Switch ( >2sec),( H):
Press this button briefly to activate DATA-HOLD mode. The " H" annunciator is
displayed.
Pressthis buttonfor twosecondsto turntheBack-Light on.Asthis alsoactivates
the DATA-HOLD mode, briefly press the button to return to normal display. To
turn the Back-Light off press again for two seconds. The Back-Light will switch-
off automatically after about 30 seconds.
7
Auto Power-down mode:
If unused for about 10 minutes, the tester will power-down automatically. Press
any of the three button switches to resume power-on mode.
Voltage Measurements
1. Connect a red test probe to the "VW" jack and the black test lead to the "COM"
jack.
2. Set the Function switch to the " V/ V" position and press the mode switch
to select DC or AC.
3. Touch the probes to the test points, the range will change automatically to the
level that will display the input voltage with best resolution.
4. Thevalueindicatedinthedisplaywindowisthemeasuredvalueofvoltagewith
proper decimal point and annunciator indication.
5. For dc, a (-) sign is displayed for negative polarity; positive polarity is implied.
8
Resistance Measurements
1. Set the Function switch to the " W" position.
2. Turn off power to the circuit under test. External voltage across the compo-
nents causes invalid readings.
3. Connect a red test probe to the "VW" jack and the black test lead to the "COM"
jack.
4. Connect the test leads to measurement points and read the value from the
display.
WARNING
The accuracy of the functions might be slightly affected, when exposed to a
radiated electromagnetic field environment, eg, radio, telephone or similar.
Diodes Testing
1. Set the Function switch to "W" position.
2. Turn off power to the circuit under test. External voltage across the compo-
nents causes invalid readings.
3. To toggle between the W/continity/diode modes, press Mode Switch.
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