MTS Series 793 - Manual (Page 81)

is typically used in multichannel block cyclic (>10 cycles per block) tests in which phasing and mean levels
must be compensated, in addition to amplitude. The PVP compensator:
• Corrects for phase as well as amplitude and mean.
• Is important for multichannel tests in which phase relationships must be maintained, and in which the
specimen is pre-loaded or the feedback waveform may be distorted.
Peak/Valley Compensation (PVC)
Peak/Valley Compensation monitors cyclic command feedback for any amplitude roll-off or mean-level
divergence. PVC is typically used in cyclic or block cyclic tests with >10 cycles per block. The PVC
compensator:
• Is widely used for cyclic and block cyclic durability testing.
• Corrects for peaks and mean level in cyclic waveforms.
• Works with linear and non-linear specimens.
Adaptive Harmonic Cancellation (AHC) Compensator
Adaptive Harmonic Cancellation (AHC) works with Amplitude Phase Control (APC) to minimize spurious
harmonic distortion. AHC is typically used in high-frequency MAST systems for ground vehicle testing.
The AHC compensator:
• Is typically used when programming with pure sine wave commands or sine sweeps in acceleration control.
• Injects input harmonics into the command waveform with the phase and amplitude required to cancel
feedback harmonics.
Note:
The adaptive harmonic cancellation function is available only when Amplitude Phase Control (APC)
is on.
How to Create a Program and Control Channel
1. Allocate and name an output resource.
a) In the Station Builder navigation pane, click Channels.
b) In the Hardware tab of the Output Resources list, select the resource you want to allocate, and then
click +.
c) In the Internal name box, select or type the desired name.
d) Optional—in the Display name box, type the desired name.
2. Specify the channel type.
In the Type list, select Program and Control.
MTS Series 793 Control Software 81
Station Builder