KEPCO KLP Series (older -1200 models) Operator Manual - Manual (Page 22)

1-8
KLP 073008
1.4 FEATURES
1.4.1 LOCAL CONTROL
Two front panel rotary encoders allow setting of voltage and current setpoints and limits. Oper-
ating mode of the power supply is indicated by lighting either a green (Constant Voltage) or
amber (Constant Current) LED. The output can be enabled or disabled by the front panel DC
OUTPUT switch; an associated indicator lights when the output is enabled (applied to the load).
Two 4-character LEDs normally display actual output voltage and current, or programmed volt-
age and current limits in setpoint mode. A selectable feature allows the unit to power up set
either to 0 Volts, minimum Amperes (default) or to the previous settings for voltage and current
when the unit was powered down (see Table 2-2).
The voltage and current controls and their associated LED displays are also used with the
FUNCTION switch and the 4-character status display for various other functions described in
PAR. 3.2. A local lockout feature (see PAR. 3.2.2.1) prevents alteration of the power supply set-
tings from the front panel when the power supply is operating in remote mode.
1.4.2 REMOTE CONTROL
Remote control of the KLP 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 RS232 ports using SCPI
commands. Most features available in local mode can be accessed in remote mode through dig-
ital programming, as well as some that are only available via digital remote programming (PAR.
3.3.1). Front panel indicators showing operating mode and output voltage and current are active
when digital programming is used. Refer to PAR’s. 3.3, 3.4 and 3.6 for more information.
1.4.2.2 ANALOG PROGRAMMING
KLP Power Supplies can also be controlled remotely using switch selectable voltage or resis-
tance. Analog programming functions include voltage and current programming, enabling/dis-
abling the output, and voltage and current readback (see PAR. 3.7).
Full scale programming/readback can be programmed using either an input analog voltage from
0 to 10V or by an input analog resistance from 0 to 10KOhms. See PAR. 3.7 for more informa-
tion.
1.4.3 DIGITAL CALIBRATION
Internal adjustments of the KLP Power Supply are automatic. Calibration can be performed in
either local or remote digital mode, using a calibrated DVM and a corresponding precision shunt
resistor.
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. Calibration is password-protected. Refer to Section 4 for more information.