MTS Multipurpose Elite - Manual (Page 79)

Level data
The level data defines the end level of the rows. The file requires a Level 1 value for each row. If a Level 2
value is included, multiple segments are being specified (cycles). Cycles run from the current level to Level
1, then to Level 2.
Note:
The first segment of each row is always a “transition” segment from the end level in the previous row
to the Level 1 value in the current row. At the beginning of the procedure, the first segment is a transition
from the current level to Level 1 in Row 0.
Phase lag
The Phase file type is the same as the Block-Arbitrary file type, except that phase relationships between
channels can be specified. When Phase is used, the following requirements must be observed:
• The waveform rate, shape, and count must be the same for all phased channels. They must be defined
with the first channel.
• The phase of one channel is compared to another; the higher value lags behind the lower value.
• Each row of data defines a waveform. The first segment of each of the waveforms is stretched to achieve
the phase lag.
When you create a profile, you must define the segment shape, end-level values, time between end levels,
and count for the command in each row.
Special consideration when running phase type profiles
While running a procedure containing a phase profile, if you stop and unlock the procedure, the resulting
cycle counts on the dependent channels may not be exact when you resume the procedure. The Profile
activity determines where to restart based on the master channel. If the other channels are on a different
segment because of phase differences, the Channel Counters on the MPE control panel will be different by
that amount.
6.2.11.8.0 Dimensions
When you assign dimensions (force, displacement, and so forth) to the end levels in a profile, they must map
to the dimensions of the control modes included in the station configuration on which you want to play out
the profile.
Because of this, it is good practice to be aware of all of the instances in which dimension selections affect
your ability to play out profiles, such as:
• Create command files (profiles) by entering the end-level values you desire the actuator to achieve during
the course of the profile. To make end-level values meaningful, you must specify dimension and unit types
(for example, displacement and centimeters).
• Use the MPE application to play out profiles. When you open the MPE application against a station
configuration, it inherits the resources of the station. These resources include the control mode dimensions
selected for the control modes in the station, as defined with the Station Builder application.
• Use the Profile activity to import profiles, and to map the logical channels in your profile (referred to as
profile channels) to the physical channels in your station configuration.
Multipurpose Elite Test Design Guide 79
6.0 Creating Advanced Tests