Overview DC Asterion Series
3-46 M330460-01 Rev A
3.4.3 Remote Current Programming by 4-20mA Source
A 4-20mA current source is connected between Pin 19 (IPRG_VSOUR) and the return
Pin 18 (RTN_PRG) and select the Analog Reference Source as 4-20mA in front panel.
Refer to Figure 3-100.
The transfer function for the output current will be as follows:
Iout = (I4-20mA – 4) (100% rated output current) / 16, with I4-20mA in mA
Which produces 0A output current at 4mA and 100% rated output current at 20mA.
Figure 3-100. Remote Current Programming Using 4-20mA Source
3.5 Remote Voltage Programming
Remote voltage programming is summed with the front panel or digital setting; see
Section 3.3. Remote voltage programming configuration is used for applications that
require the output voltage be programmed (controlled) from a remote instrument. An
external resistance or external voltage source or 4-20mA source may be used as a
programming device. When using remote voltage programming, a shielded, twisted-
pair cable is recommended to prevent noise interference to programming signals.
3.5.1 Remote Voltage Programming by Resistance
Analog Reference source is selected as Resistance from the front Panel. Refer to
Figure 3-101. The resistance-programming default coefficient for output voltage is
(100% rated output voltage) / 5 kΩ, with input at Pin 3 (VPRG_ISOUR) and return to
Pin 18 (RTN_PRG). An internal current source, factory-set at 1 mA, from Pin 20 is
utilized to drive the resistance. This produces a transfer function for output voltage, as
follows:
Vout = R * (100% rated output voltage) / 5 kΩ), with R in kohms.
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