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7 - Programming the DC Source
72
Maximum Voltage
The maximum output voltage that can be programmed can be queried with:
VOLT? MAX
Overvoltage Protection
The dc source will turn off its output if the output voltage exceeds its programmed setting by two volts
when measured at the + sense and − sense terminals. If the operation of the overvoltage protection circuit
interferes with the proper operation of your phone test, you can disable overvoltage protection. As
explained in chapter 8, this protection feature is implemented with the following command:
VOLT:PROT:STAT <bool> where <bool> is the voltage protection state (0 | OFF; 1 | ON).
CAUTION: If overvoltage protection is disabled, the dc souce or the equipment under test will not be
protected from excessive external voltages.
Output Current
All models have a programmable current function. The command to program the current is:
CURR <n> or
CURR2 <n> for models that have a second output
where <n> is the current limit in amperes.
If the load attempts to draw more current than the programmed limit, the output voltage is reduced to
keep the current within the limit.
Maximum Current
The maximum output current that can be programmed can be queried with:
CURR? MAX
Overcurrent Protection
The dc source can also be programmed to turn off its output if the current limit is reached. As explained
in chapter 8, this protection feature is implemented the following command:
CURR:PROT:STAT ON | OFF
NOTE: Use the OUTPut:PROTection:DELay command to prevent momentary current limit
conditions caused by programmed output changes from tripping the overcurrent
protection.
Output Resistance
The output resistance is controlled with the RESistance command. To set the output resistance to 0.5
ohms, use:
RES 0.5