KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 89)

SERIES EL 071414
B-21
B.106 SYSTem:RAMP COMMAND
SYST:RAMP
Syntax: Short Form: SYST:RAMP Long Form: SYSTem:RAMP
Where is ramp duration (Seconds) of both positive and negative ramps from 0.0001 to 10.000.
Description: Establishes the time for unit to change states in both positive and negative directions. See
SYST:RAMP:POS (PAR. B.108) and SYST:RAMP:NEG (PAR. B.110) to set different ramp times for
positive and negative directions.
Ramps work in all modes except power. The ramp consists of up to 4000 evenly spaced steps in times
from 4.5 microseconds to 2.50 milliseconds (max ramp time is 10 seconds). The ramp will either step
from one level to the other in 4.5 microsecond steps or will execute approximately 4000 steps at a time
required to meet the ramp duration. For example, a ramp of 1 millisecond consists of 222 steps (4.5
microseconds per step). A ramp of 100 milliseconds consists of 4000 steps (25 microseconds per
step). A ramp of 2 seconds consists of 4000 steps (0.5 milliseconds per step).
When using both ramps and transients at the same time, the following must be observed (see Figure
B-1 for timing, see PAR. B.100 to initiate a transient pulse.):
- Transient must be greater than set point if positive ramp and negative ramp are different.
- Transient pulse period must exceed positive RAMP by at least 1 millisecond.
- Transient must be greater than (positive ramp + negative ramp + 0.002)
- Transient count can be from 1 to 65000.
- To configure Transient see PAR. B.30 for conductance, PAR. B.38 for current, PAR. B.50 for
resistance and PAR. B.62 for voltage.
B.107 SYSTem:RAMP? QUERY
SYST:RAMP?
Syntax: Short Form: SYST:RAMP? Long Form: SYSTem:RAMP?
Returns: = the larger of SYST:RAMP:POS and SYST:RAMO:NEG
Description: Indicates the larger of the positive and negative ramp times. For example, If SYST:RAMP:POS is
set to 2 and SYST:RAMP:NEG is set to 1.5, SYST:RAMP? returns 2.000.
B.108 SYSTem:RAMP:POSitive COMMAND
SYST:RAMP:POS
Syntax: Short Form: SYST:RAMP:POS Long Form: SYSTem:RAMP:POSitive
Where = positive ramp duration (Seconds) from 0.0001 to 2.000.
Description: Establishes the time for unit to change states in positive direction. See SYST:RAMP command,
PAR. B.106 for ramp details. and restrictions.
B.109 SYSTem:RAMP:POSitive? QUERY
SYST:RAMP:POS?
Syntax: Short Form: SYST:RAMP:POS? Long Form: SYSTem:RAMP:POSitive?
Returns: = positive ramp duration (4Seconds) from 0.0001 to 2.000.
Description: Indicates the positive ramp time.
B.110 SYSTem:RAMP:NEGative COMMAND
SYST:RAMP:NEG
Syntax: Short Form: SYST:RAMP:NEG Long Form: SYSTem:RAMP:NEGative
Where = negative ramp duration (Seconds) from 0.0001 to 2.000.
Description: Establishes the time for unit to change states in negative direction. See SYST:RAMP command,
PAR. B.106 for details and restrictions.
B.111 SYSTem:RAMP:NEGative? QUERY
SYST:RAMP:NEG?
Syntax: Short Form: SYST:RAMP:NEG? Long Form: SYSTem:RAMP:NEGative?
Returns: = negative ramp duration (Seconds) from 0.0001 to 2.000.
Description: Indicates the negative ramp time.