Omega HHM290, Instruction Manual, Page: 10 / 10

8 9
Note: Unplug the test leads and thermocouple probes from
the multimeter before making any capacitance or
inductance measurement.
Capacitance Measurements
Do Not apply external voltage to the Cx Lx sockets. Make sure
that the capacitor is fully discharged, otherwise damage to the
meter may result.
1. Set the Function switch to the desired capacitance range (µF to
nF).
2. Insert the capacitor leads into the Cx Lx sockets.
3. Read the capacitance value.
Inductance Measurements
1. Set the Function switch to the desired inductance range (mH to
H).
2. Insert the inductor leads into the Cx Lx sockets.
3. Read the inductance value.
Diode Tests
1. Connect the red test lead to the "V " jack and the black test
lead to the "COM" jack.
2. Set the Function/Range switch to the " " position.
3. Turn off power to the circuit under test.
4. Touch probes to the diode. A forward-voltage drop is about 0.6V
(typical for a silicon diode).
5. Reverse probes. If the diode is good, OL is displayed. If the
diode is shorted, ".000" or another number is displayed.
6. If the diode is open, OL is displayed, in both directions.
7. If the junction is measured in a circuit and a low reading is
obtained with both lead connections, the junction may be
shunted by a resistance of less than 1K
Ω
. In this case the diode
must be disconnected from the circuit for accurate testing.
Logic Measurements
1. Set the Function/Range switch to the Logic position.
2. Connect the red test lead to the "V
" jack and the black test
lead to the "COM" jack.
3. Connect the red test lead to the test point and the black lead to
the common bus of the logic circuit.
4. A " "on the display indicates TTL logic high and a " " indicates
a TTL logic low. Both indicators are on when the point of
measurement is toggling high and low.
SPECIFICATIONS
Display: Backlit liquid crystal display (LCD) with a maximum
digital reading of 43000 counts. Includes an Analog Bar Graph
of 40 counts.
Display Resolution:
Range: 0-4.3
→
.0001
0-43
→
.001
0-430
→
.01
0-4300
→
.1
0-43000
→
1
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: "OL" or "-OL" is displayed.
Low battery indication: The "
" is displayed when the battery
voltage drops below the operating level.
Measurement rate:
2/sec, nominal; 1/sec, temperature.
20/sec, Analog display.
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 humid-
ity.
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: 6 pcs 1.5V (AA size).
DC Adaptor :DC 9Vmin. - 12Vmax. (LOAD 50mA min.) Use a
certified (CE, VDE) current limited adapter.
Battery life: 100 hours typical.
Dimensions: 202mm (H) x 100mm (W) x 50mm (D).
Weight: Approx. 18.5 oz. (525g) including battery.
Accessories: The unit comes with a protective Rubber Boot, a
pair of test leads, 6 AA size Batteries, One Spare fuse, Type K
Beaded wire thermocouple, and the instruction manual.
Tripod Mount: ¼" - 20 UNC.