KEPCO BHK-MG 200W (Full Rack) Series - Manual (Page 24)

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BHK-MG (OPR) 022014
1.4 FEATURES
1.4.1 LOCAL CONTROL
Front panel keypad entries and an LCD type display are utilized for setting and/or adjusting out-
put voltage and current under local control. The keypad's keys are organized to either directly
execute commands, or to introduce a program that can either be run once or cycled. Calibration
of the unit is facilitated by a password -protected, menu-driven procedure from the front panel.
Refer to PAR. 3.2 for more information.
1.4.2 REMOTE CONTROL
Remote control of the BHK-MG Power Supply can be accomplished either through digital or
analog programming.
1.4.2.1 DIGITAL PROGRAMMING
Digital control is available directly via either the IEEE 488.2 (GPIB) or RS 232 bus using SCPI
commands. Nearly all features available in local mode can be accessed in remote mode
through digital programming. Refer to PAR’s. 3.3 and 3.5 for more information.
1.4.2.2 ANALOG PROGRAMMING
BHK-MG Power Supplies can also be controlled remotely using analog means, such as analog
voltage or current, fixed or variable resistors, or a combination of them. This great flexibility is
made possible by two uncommitted amplifiers (for voltage and current) and two reference volt-
ages (+10V d-c and -10V d-c) available at the rear panel analog programming terminals. The
chosen means of control (voltage, current, resistance, or a combination) must deliver 0 to –10V
d-c at the output of the uncommitted amplifiers in order to have control over the entire range of
the output voltage/current limit or output current/voltage limit. The analog programming port is
not calibrated, however the zero point is accurate to less than 0.1%. The full scale tolerance is
2% maximum when using the preamplifier with external matched-pair resistors. Refer to PAR.
3.6 for more information about remote programming using the analog programming terminals.
1.4.2.3 ANALOG READBACK
The output voltage and current analog readback signals (uncalibrated), as well as some flag sig-
nals, are available for testing and customer usage via an internal connector (A2J5). Refer to
Table 1-3 for details about A2J5 signals; refer to Table 1-5 to obtain the A2J5 mating connector.
Wires (with isolation rated for at least the nominal output voltage of the unit) can be routed
through the wire entry bushing at the rear panel (see Figure 2-2).
1.4.3 DIGITAL CALIBRATION
The BHK-MG Power Supply contains no internal adjustments. Calibration is done entirely via
the front panel keypad and LCD, using a calibrated DVM and a corresponding precision shunt
resistor. Calibration instructions appear on the front panel LCD after a password is entered.
Calibration constants for programming and read-back activities are calculated by the microcon-
troller and stored in the non-volatile memory. No internal adjustments are necessary The previ-
ous calibration is saved and can be restored if desired. The original factory calibration can also
be restored. Refer to Section 4 for more information.