HBM GEN3i, Руководство пользователя

Страница: 514 / 1160

Real
-
Time Cycle Based Calculators (Perception V6.72 and higher)
N
L H
L2
L1
Cycle Based Calculator
Cycle
Timer Cycle Source
Cycle Count
Level Crossing
Cycle Detect
F
(x)
Trigger Detector
Source
Selectable
Math
To Channel &
Card Trigger
Measured Channels
Calculated
Channels
Figure A.107: Real
-
time cycle based calculators
Cycle Source
Determines the periodic real
-
time calculation speed by either setting a timer or using a
real
-
time cycle detect
Cycle Source: Timer
Timer duration 1.0 ms (1 kHz) to 60 s (0.0167 Hz)
Cycle Source: Cycle detect
Level crossing
Real
-
time monitors one input channel using a signal level, hysteresis and direction to
determine the cyclic nature of the signal
Cycle count Sets the counted number of cycles used for periodic calculation output
Cycle period
(1)
Maximum Cycle period that can be detected: 0.25 s (4 Hz)
Minimum Cycle period that can be detected: 0.91 ms (1.1 kHz)
Calculations are stopped when the Cycle period exceeds its maximum Cycle period
(0.25 s).
Cycle count is temporarily increased when Cycle period becomes shorter than minimum
Cycle period (0.91 ms).
Time event notifications in the channel data indicate when the Cycle period has been
exceeded or when the automatic Cycle count is increased.
Cycle based calculator
Number of calculators 32; at sample rates 200 kS/s or lower. At higher sample rates, the number of calculators is
reduced to match the available DSP power.
DSP load Each calculator can perform 1 calculation. Not every calculation uses the same DSP power.
Selecting a calculation with the highest computation power could result in a reduction in the
total number of calculators. Different combinations require different computation power. The
effects of selected combinations is reflected in Perception software.
Cycle Source calculations Cycle and Frequency
Analog channel calculations
RMS, Minimum, Maximum, Mean, Peak
-
to
-
Peak, Area, Energy and MeanOfMultiplication
Timer/Counter channel calculations Frequency (to enable triggering). RPM of Angle.
Cycle Square wave signal, 50% duty cycle.
Represent Cycle Source; rising edge indicates start of new calculation period.
Frequency Detected cycle interval is converted to a frequency (1/cycle time of input signal)
Trigger detector
Number of detectors
32; One per real
-
time calculator
Trigger level Defined by the user for each detector. Generates trigger when the calculated signal crosses
the level.
Trigger output delay Triggers are delayed by 100 ms on calculated signals. The trigger time is corrected internally
so that the sweep triggering is correct. An additional pre
-
trigger length of 100 ms is added
to enable the trigger time correction. This reduces the maximum sweep length by 100 ms.
(1) Cycle period range depends on signal wave shape and hysteresis setting. Specified for Sine wave with 25% Full Scale hysteresis.
GEN3i
514 I3763-3.1 en HBM: public