KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 3.87 to 3.xx - Manual (Page 82)

B-20
SERIES EL 022013
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 10 seconds consists of 4000 steps (2.5 milliseconds per step).
When using both ramps and transients at the same time, the following must be observed (see Figure
B-3 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.
FIGURE B-3. RAMP AND TRANSIENT TIMING
KEPCO, EL 5K-200-600 01-18-2010,A999101,MCB #205 1.176 $ 2010/01/18
22:27:06 $
1.585 100 119C 1.535 100 117C 1.610 100 113C 1.585 100 97C
1.535 100 104C 1.585 100 114C 1.535 100 110C 1.610 100 104C
1.560 100 98C 1.585 100 106C 1.585 100 100C 1.585 100 101C
1.610 100 94C 1.560 100 93C 1.585 100 100C 1.610 255 91C
1.535 100 87C 1.535 100 82C 1.560 100 86C 1.585 100 82C
1.560 100 74C 1.535 100 76C 1.560 100 76C 1.535 100 71C
119 C 117 C 113 C 97 C
104 C 114 C 110 C 104 C
98 C 106 C 100 C 101 C
94 C 93 C 100 C FUSE 91 C
87 C 82 C 86 C 82 C
74 C 76 C 76 C 71 C
A = Transient
B = SYST:RAMP:POS
C = SYST:RAMP:NEG
D = Transient
E = Transient (no ramp)
F = Transient (with ramp)
Positive
Ramp Negative
Ramp
Transient pulse
(Count = 3)