Omega HHM22 User Manual page 9

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 switch to the desired voltage type (DCV) or (ACV) position.
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. The value indicated in the display window is the measured value of voltage
with proper decimal point and annunciator indication.
5. For dc, a (-) sign is displayed for negative polarity; positive polarity is implied.
Current Measurements
1. Connect the red test lead to the "µAmA" jack and the black test lead to the
"COM" jack.
2. Set the Function switch to the desired voltage type (DCA) or (ACA) position.
3. For current measurements less than 320mA, connect the red test lead to the
"µAmA" jack and the black test lead to the COM jack.
4. For current measurements of 320mA or greater, connect the red test lead
to the "10A" jack and the black test lead to the COM jack.
5. Remove power from the circuit under test and open the normal circuit path
where the measurement is to be taken. Connect the meter in series with the
circuit.
6. Apply power and read the value from the display.
7. Use caution when measuring 10 amps on 10A range for 60s, please waiting
for 10 minutes for next measurement of 10 amps for safety reason.
7