MTS Multipurpose Elite - Manual (Page 78)

Comments Range Keyword
This entry is required. Undetermined Level1
This entry is required for more than one
segment. Undetermined Level2
This optional entry specifies the phase lag for
phase profiles. The default is 0. 0–360°
Phase Lag
2
Rate type
A rate type determines the time base of the waveform. Three types of rate expressions (keywords) are
supported:
• FREQUENCY (Hz, cps)
• TIME (msec, sec, minutes, and so on)
• RATE (units per time; for example, kip/sec)
A constant rate type of TIME= 2.5 sec assigns 2.5 seconds to each row of segment data. When a constant
is defined, the related column (Frequency/Rate/Time) is not allowed. A variable rate type identifies a column
of time values, where each row can have a different time base.
Count
The count lets you repeat a cyclic waveform a specific number of times. The COUNT keyword can repeat
segments or cycles.
• 1 cycle = 2 segments
• A cycle count of 0.5 is the same as a single segment.
• Repeating a segment an even number of times ends at Level 2.
• Repeating a segment an odd number of times ends at Level 1.
The count can be set to a constant such as COUNT= 1 SEGMENTS. This runs each Level 1 parameter once.
It is useful for profiles that issue a series of arbitrary end levels. In this case, the values in Level 2 are not
used.
Note:
The TrueSine segment shape always starts and stops at its mean level, and will cause an error if the
previous row did not end at its mean level.
Shape
The waveshape defines how to go from the current end level to the next end level. The SHAPE keyword can
define a waveshape as a constant at the beginning of the channel (SHAPE= RAMP), or it can define a column
of data to assign a shape to each row.
2 Phase lag is not supported by block-arbitrary profiles.
78 Multipurpose Elite Test Design Guide
6.0 Creating Advanced Tests