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2
Making Measurements
– Press
NOTE
– The Auto function is able to automatically identify the signal component (AC
% Scale of 4-20 mA or 0-20 mA
To display the current measurement in % scale, set up your tester to measure DC
current as shown in
– The 4-20 mA current loop output from a transmitter is a type of electrical
NOTE
– The % scale for 4-20 mA or 0-20 mA in this tester is calculated using its
The analog bar graph displays the current measurement value. (In the example
above, 24 mA is represented as 125% in the 4-20 mA % scale.)
Table 2-6
% Scale measurement range
% Scale of 4-20 mA or 0-20 mA
[a] Applies to both autoranging and manual range selection.
You can change the % scale range (4-20 mA or 0-20 mA) in the Setup
Use the % scale with a pressure transmitter, a valve positioner, or other output
actuators to measure pressure, temperature, flow, pH, or other process variables.
78
to measure the frequency of the AC or DC current source. See
"Measuring Frequency"
or DC) of an electrical source. See
page 72 to learn more.
Figure
signal that is used in a series circuit to provide a robust measurement signal
that is proportional to the applied pressure, temperature, or flow in process
control. The signal is a current loop where 4 mA represents the zero percent
signal and 20 mA represents the 100 percent signal.
corresponding DC mA measurement. The tester will automatically optimize
the best resolution for the selected measurement. Two ranges are available
for the % scale as shown in
999.99%
9999.9%
on page 79 to learn more.
"Auto AC or DC signal identification"
2-14, then press
Table
2-6.
DC mA measurement range
until the % scale is shown.
[a]
6 μA or 600 mA
U1461A/U1453A User's Guide
on
(page
157).
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