KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 72)

B-4
SERIES EL 071414
B.12 [SOURce:]INPut:CUToff:TIME? QUERY 
INP:CUT:TIME?
Syntax: Short Form: [SOURce:]INP:CUT:TIME? Long Form: [SOURce:]INPut:CUToff:TIME?
Returns = .0000 to 9999.000 (seconds)
Description: Returns time (in milliseconds) established by INP:CUT:TIME (PAR. B.11). This is the time to wait
before changing input from disabled to off.
B.13 [SOURce:]INPut:CUToff:VOLTage COMMAND 
INP:CUT:VOLT
Syntax: Short Form: [SOURce:]INP:CUT:VOLT
Long Form: [SOURce:]INPut:CUToff:VOLTage
where = minimum input voltage (Volts)
Description: Establishes a minimum input voltage required for engaging the load. When input voltage drops
below minimum input voltage, the input is disabled (set to 0 for current and conductance, set to maxi-
mum for voltage and resistance), the LOAD indicator begins blinking green/amber and INP? returns
1,DIS (disabled). If the voltage increases above minimum input voltage (B, Figure 3-7) while the input
is disabled, the load is engaged, the input is enabled and the load returns to the previous setpoint. The
LOAD indicator changes to steady amber to indicate the load is engaged and INP? returns 1 (on). See
PAR. 3.16 and Figure 3-7 for details about how this command functions.
B.14 [SOURce:]INPut:CUToff:VOLT? QUERY 
INP:CUT:VOLT?
Syntax: Short Form: [SOURce:]INP:CUT:VOLT? Long Form: [SOURce:]INPut:CUToff:VOLTage?
Returns = minimum input voltage (Volts)
Description: Returns the value of minimum input voltage set by INP:CUT:VOLT (see PAR. B.13).
B.15 INPut:RAMP COMMAND 
INP:RAMP
Syntax: Short Form: INP:RAMP Long Form: INPut:RAMP
where = input ramp time (0 to 2,000 msec)
Description: Establishes a ramp to reach operating mode setpoint after engaging the load. When the load is
engaged, this command establishes the time it takes to attain the operating mode setpoint value. For
current and conductance modes, the ramp starts at zero and increases in even steps over the duration
established by until the setpoint is reached. For voltage and resistance modes the ramp starts
at maximum and decreases to the setpoint value. This command does not operate in Power mode.
Units shipped from the factory are set to the recommended minimum of 20 milliseconds.
If the input ramp time is set to a number between 1 and 10,000, the ramp occurs when either a) the
LOAD switch is pressed to engage the load or b) when input voltage is lost, then rises above the cutoff
point while INP:CUT:VOLT (see PAR. B.13) is active. To turn off this ramp, send INP:RAMP 0. Setting
INP:CUT:VOLT to any value will disable the output and reduce overshoot at the start of the ramp.
This command operates in conjunction with SYST:RAMP (see PAR. B.106) which establishes a ramp
that is effective when the output changes state. If SYST:RAMP is in use, the ramp introduced by
INP:RAMP will be the larger of the times set by INP:RAMP and SYST:RAMP.
Figure 3-7 shows the timing for INP:RAMP. The initial conditions are: the load is disengaged, LOAD
indicator shows green, input voltage is present, and the output is 0 for current or conductance, maxi-
mum for voltage or resistance. Sending INP? at this point returns 0, indicating the load is disengaged.
When the LOAD switch is pressed or INP:ON is received, the LOAD indicator changes to amber, the
load is engaged and the input ramps to the setpoint value within the time established by INP:RAMP
(A, Figure 3-7). Sending INP? returns 1 (on).