YOKOGAWA HANDY CAL CA51, Руководство пользователя

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IM CA71-E
4-5
Source
4
4.2 Sourcing DC Voltage, DC Current or SINK Current Signal
4.2.3 20 mA SINK Function
The 20 mA SINK function can draw a preset amount of current from an
external voltage source to the H terminal. Thus, you can use the cali-
brator in a loop test, for example, as a simulator for two-wire transmit-
ters. In that case, use this function within the 5 to 28 V range of applied
voltages. The minimum value of the range for the 20 mA SINK function
is 0.1 mA. You can test the I/O signals of a distributor by wiring the
calibrator as indicated by the dashed lines in the following figure.
MEASURE
CA71
SOURCE
24V DC
AC or DC power supply
1-5 V output 4-20 mA
Distributor
H L mA H L
Drawing SINK Current
Step 1: Before connecting to the terminals, select with the source
range setting rotary switch.
Step 2: Connect the positive terminal of an external power source to
the H output terminal and the negative terminal to the L output
terminal.
Step 3: Turn on the external power source and press the key.
The indicator on the LCD changes from to . The
calibrator sources the preset current value of the 20 mA SINK
function between the output terminals.
Step 4: To turn off the output, press the key once again. The
appears on the LCD and the output terminals are open-cir-
cuited.