AMETEK PLA-PLW - Manual (Page 91)

RESistance ŸResistance Programming Functions
This subsystem programs the constant resistance mode functions of the Electronic Load. The IEEE488.1 command,
“RSET” and “SET” (if current active mode is CR mode), can also be used.
RES
This command sets the input resistance level that is to be applied immediately in the constant resistance mode. If the
Electronic Load is not in the CR mode when the command is sent, the programmed level is saved and is applied when the
Load changes to CR mode. The rate of input change is in accord with the slew rate in effect.
Parameter: Low Range: minimum to maximum value ; MIN; MAX Units: :
Middle Range: minimum to maximum value; MIN: MAX
High
Range: minimum to maximum value; MIN; MAX
Example: “RES 5” – sets the resistance level to 5ohms.
RES:TRIG
This command sets the input resistance level that is to be applied on occurrence of a trigger in the constant resistance
mode. If the Electronic Load is not in the CR mode when the command is sent, the programmed TRIG level becomes a
stored IMM level that takes effect when the Load changes to CR mode. The rate of input change is in accord with the
slew rate in effect.
Parameter: minimum to maximum value; MIN; MAX Units: :
RES:TLEV
This command sets the transient resistance level in the CR mode. When the transient subsystem is on, the Electronic
Load will switch between the main level and transient level at a rate determined by the slew rate in effect. The IEEE
488.1 command, “RTR” can also be used. The input resistance transient switching will occur only when RES:TLEV is
programmed as following:
Low Range
TLEV>LEV
Middle and high range TLEV
Parameter: minimum to maximum value; MIN; MAX Units: :
Example: “RES:TLEV 15” – sets the resistance transient level to 15ohms.
RES:DUTY
This command sets pulse duty cycle, as a percentage of the total cycle, of continuous transient mode in CR mode. If the
Electronic Load is operating in another mode, the duty cycle is stored until the Load changes to continuous mode.
Parameter: 2 to 98; MIN; MAX Unit: %
Example: “ RES :DUTY 50” – sets a 50% duty cycle for transient current mode.
RES:FREQ
This command sets pulse frequency of continuous transient mode in Hz. If the Electronic Load is operating in another
mode, the pulse frequency is stored until the Load changes to continuous mode.
Parameter: 0.25 to 20000; MIN; MAX Unit: Hz
Example: “RES:FREQ 1000” – sets a 1000Hz frequency for transient current mode.
RES:SLEW
This command sets the current slew rate for both ranges in CR mode. The programmed slew rate is in effect for all
current changes except INP:ON or OFF. The hardware implementation selects a slew rate that is closest to the
RES:SLEW value. To determine the actual value, use the query RES:SLEW?.
Parameter:
Low Range: minimum to maximum value; MIN; MAX Units: Ohm/ Ps.
High Range: minimum to maximum value; MIN; MAX
Example: “RES:SLEW 0.1” - sets the resistance slew rate to 0.1A/ Ps.
RES:LIM:MAX
This command sets and queries the maximum input resistance level that is to be applied immediately in the CR mode.
Parameter: 0 to maximum value; MIN; MAX Units: Ohm.
Example: “RES:LIM:MAX 50” – sets maximum resistance input level to 50 Ohms.
RES:LIM:MIN
This command sets and queries the minimum input resistance level that is to be applied immediately in the CR mode.
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