Dc Current Measurement - Omega CA450 User Manual

4.3.7

DC Current Measurement (

WARNING
To avoid damaging the instrument and other equipment:
• Before you start measuring, make sure that the position of the function switch and
position of the input terminals for connecting the test leads are appropriate for the
desired mode of measurement.
The maximum input current for mA measurement is 0 mA.
) Turn the function switch to the "
2) Connect the black test lead to the COM input terminal,
and connect the red test lead to the
) Connect the test leads to the circuit under measurement,
and then read the value when it stabilizes.
Press the RANGE key to select a range.
Subdisplay (percentage of span)
When the range is 4 to 20 mA
Main display
30 mA range
Subdisplay: Displaying and Configuring the Span
In addition to the DC current value in the main display, you can also display the span value as a
percentage in the subdisplay.
Subdisplay for the 30 mA Range
Input Current Value
(Main display)
-.000 mA
0.000 mA
.000 mA
20.000 mA
0.000 mA
.000 mA
The displayed value varies depending on the setting ( to 20 mA or 0 to 20 mA) made in
section .., "Current Span Setting."
)
" position.
input terminal.
Subdisplay (percentage of span)
When the range is 10 to 50 mA
Main display
100 mA range
Subdisplay for the 0 mA Range
 to 20 mA
-231.3%
-25.0%
0.0%
100.0%
162.5%
181.3%
26
Test leads
Red Black
0 to 20 mA
-165.0%
0.0%
20.0%
100.0%
200.0%
165.0%