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Page 13 PRC70-EN-V2.1 12/11
7.3.1 Manually Set 25%, 100% 4–20 mA Function
The source can be set within the 4–20 mA current range.
Step 1:
In DC current mode, press the
〔
25%100%
〕
key to display “25%SET” on the lower part of the screen, and press
again to display “100%SET”. The default source values will be shown.
Step 2:
Using each pair of
〔
S
〕
/
〔
T
〕
output setting keys, set the signal in a step-by-step manner. In the 25% set point
condition, the signal can be set in 4 mA increments or decrements in the sequential order 4-8-12-16-20 by each press of the
key. In the 100% set point condition, the signal can set in 16 mA increments or decrements by each press of the key.
Pressing the
(ZERO)
key initializes the signal set point to the default value (4.00).
Step 3:
Pressing the
(ON)
key causes the indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator sources the
preset 4–20 mA current signal between the output terminals.
Step 4:
To switch OFF the output, press the
(ON)
key again. The’’ OFF ‘’appears on the LCD and no signals are sourced
between the terminals.
6.3.2 Auto-stepping and auto-sweeping 4-20mA function
The user can set a 4–20 mA range in which to auto-step or auto-sweep. 80 seconds are required to finish a 4-20mA cycle in
auto-sweeping mode and 20 seconds are required for auto-stepping mode.
Step 1:
In the DC current mode, press the
〔
〕
key to display the auto-stepping mode icon “
” on the lower part of
the screen; press again to display the auto-sweeping mode icon “
”. The default source value will display.
Step 2:
Pressing the
(ON)
key causes the indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator sources the
default 4–20 mA current signal between the output terminals.
Step 3:
Pressing the
(START)
key starts the auto-stepping or the auto-sweeping mode. The “RUN” icon is displayed in the
lower part of the LCD.
Step 4:
Pressing the
(START)
key again stops the auto-stepping or the auto-sweeping mode. The “RUN” icon switches
OFF.
Step 5:
Pressing the
(ON)
key cancels the sourcing and the ‘’OFF’’ icon is displayed on the screen. No signals are sourced
between the terminals.
Notes:
z
Press
the
(START)
key again to continue the auto-stepping or the auto-sweeping mode after stopping them; The “RUN”
icon is displayed on the lower part of the screen.
z
The ability to use the
(START)
key to start mA auto-stepping and auto-sweeping mode is only available when the
source function is in the ON state.
z
Starting the mA auto-sweeping mode switches OFF the measurement mode. The mA auto-stepping mode and the
measurement function cannot run simultaneously.
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