System 9700 User Manual
Page 39 of 56
3.3.5.1. Arbitrary point ramp profile method
With the “arbitrary point method”, it is possible to download up to fifteen independent points
each generating a ramp line (through interpolation). This profile must be stored in one of the
15 available stacks.
Each ramp point consists of a stack number, a starting point (current set value, normally the
previous end point), an end point (current set value) and a time value for reaching the given
end point.
E.g. Command: WSA 'sp' stack, start, stop, time 'cr'
To use the arbitrary point method, at least the following steps must be performed:
Clear the stack “CSS [parameter]”
Program the stack “WSA [parameter]”
Set the speed “SPEED [parameter]”
Set the attenuator “MULT [parameter]”
Start the stack “TS [parameter]”
Read the status of the running stack “S2"
Please refer to the software manual for “SW2 Ramp Profile Commands” for full instructions.
The figure below shows an example of one ramp profile stack (note: not all 15 points need to
be programmed, empty entries will be ignored.)
T1 T2 T3 T4 T5 T6 T7
Output
Current
Time
From
TRIG
Software Ramp Profile
No1
No2
No3
No4
No5
No6
No7
Relative
Arbitrary Point Method
After the start (Trig) command, the SW will update the output current every 1.25ms in both the
FAST and SLOW mode (Step Time). This enables it to calculate the staircase size (interpolating
step size) according to the formula below:
( − ) ×
∆
=
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