YOKOGAWA CA550 User Manual

2.2 DC Current Source
2-4
IM CA500-01EN
Description
Source Range
You can select from the following four source ranges.
Range Source Range
20 mA ±24.000 mA
4-20 mA 0.000 mA to 24.000 mA
4-20 mA√ 0.000 mA to 24.000 mA
4-20 mA Sim 0.000 mA to 24.000 mA
4-20mA
The interval between 0% and 100% is equally divided by four, and the 0%, 25%, 50%, 75%,
and 100% values are output. By default, because the 0% value is assigned to 4.000 mA
and the 100% value is assigned to 20.000 mA, this can be used as a calibration signal for
instruments that use 4 to 20 mA as input signals.
Square Root Computation Function (4-20 mA√)
This can be used as a calibration signal for instruments that output the square root of input
signals.
DC currents corresponding to the square root of 4 mA, 8 mA, 12 mA, 16 mA, and 20 mA are
generated.
4-20 mA Simulate
Currents ranging from 0 to 20 mA that simulate transfer signals are generated. This can be
used to perform a loop check on the source value by connecting to a distributor or the like.
4-20mA
+
—
Distributor
Output 1 to 5 V
H
L
CA500/CA550
Source Value
Currents within each source range are generated.
In the default setting of the 4-20mA and 4-20mA Simulate ranges, 4 mA to 20 mA are divided into
four, and 4 mA, 8 mA, 12 mA, 16 mA, and 20 mA are generated.
In the default setting of the 4-20mA√ range, 4 mA to 20 mA are divided into four, and values
corresponding to the square root of 4 mA, 8 mA, 12 mA, 16 mA, and 20 mA are generated.
Source value = (%/100)×(%/100)×(100% value - 0% value) + 0% value
In the 4-20mA√ range, 0% = 4 mA and 100% = 20 mA, so for 25% = 8 mA,
Source value = (25/100)×(25/100)×(20 mA - 4 mA) + 4 mA = 5 mA.
Notes about Sourcing
Be careful not to open the output terminals.
When the output terminals are opened, the output is automatically turned off by the protection
function.

YOKOGAWA CA550 Specifications

General

Brand	YOKOGAWA
Model	CA550
Category	Test Equipment
Language	English