Periodic triggering feature is intended to be used temporarily for a
short-time to record certain network conditions, when other triggering
modes cannot be used. Continuous use of periodic triggering is
forbidden as it may degrade flash memory life due to continuous
frequent write operations.
8.2.1.3 Length of recordings
The user can define the length of a recording with the
Record length
parameter. The
length is given as the number of fundamental cycles.
According to the memory available and the number of analog channels used, the
disturbance recorder automatically calculates the remaining amount of recordings
that fit into the available recording memory. The user can see this information with
the Rem. amount of rec monitored data. The fixed memory size allocated for the
recorder can fit in two recordings that are ten seconds long. The recordings contain
data from all analog and binary channels of the disturbance recorder, at the sample
rate of 32 samples per fundamental cycle.
The user can view the number of recordings currently in memory with the Number
of recordings monitored data. The currently used memory space can be viewed with
the Rec. memory used monitored data. It is shown as a percentage value.
The maximum number of recordings is 100.
8.2.1.4 Sampling frequencies
The sampling frequency of the disturbance recorder analog channels depends
on the set rated frequency. One fundamental cycle always contains the amount
of samples set with the
Storage rate
parameter. Since the states of the binary
channels are sampled once per task execution of the disturbance recorder, the
sampling frequency of binary channels is 400 Hz at the rated frequency of 50 Hz and
480 Hz at the rated frequency of 60 Hz.
Table 947: Sampling frequencies of the disturbance recorder analog channels
Storage rate
(samples per
fundamental
cycle)
Recording
length
Sampling
frequency of
analog
channels,
when the
rated
frequency is
50 Hz
Sampling
frequency of
binary
channels,
when the
rated
frequency is
50 Hz
Sampling
frequency of
analog
channels,
when the
rated
frequency is
60 Hz
Sampling
frequency of
binary
channels,
when the
rated
frequency is
60 Hz
32 1* Record
length
1600 Hz 400 Hz 1920 Hz 480 Hz
16 2* Record
length
800 Hz 400 Hz 960 Hz 480 Hz
8 4 * Record
length
400 Hz 400 Hz 480 Hz 480 Hz
1MRS757644 H Measurement functions
620 series
Technical Manual
967
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