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When the instrument is turned on and when the instrument setup configuration
changed, the instrument always waits for the measurements to be fully settled before
displaying readings. The settling delay for time averaged measurements (demands)
may be as long as the user-defined averaging interval.
The following descriptions can help the user estimate the response time for a
particular measurement and output:
The data processing modules run on periodical basis, typically 200 ms each for base
RMS measurements, and 100-200 ms each for demand and energy calculations. For
harmonic measurements, each run provides processing of a single input, either
voltage or current, so the harmonic reading for the selected input is updated each 1
second. Those delays can be considered to be the update rate for real-time readings.
For sliding average measurements, you should consider the number of measurements
to be taken for averaging.
For time average measurements, the update rate is synchronized with the user-
defined averaging time, or with the external synchronization source. All time
average measurements are updated at the end of the respective demand interval,
except of the real-time predicted demands, i.e., accumulated demand and sliding
window predicted demand, that are updated at soon as the new real-time
measurement is made.
A level change at the discrete input will be recognized within at most 40 ms after the
signal was asserted high or low. The total settling delay for either status or pulse
input is considered to be at 50 ms. The pulse counters connected to the pulse inputs
will be updated at that time.
The display readings are updated approximately twice per second. The analog
output is updated each 100-200 ms, but in reality, the output value might not change
if measured data has not yet been updated.
The response time for setpoint operations using the disturbance trigger can be at one
cycle time, and using measurement readings, or external triggers - at 100-200 ms
without taking into consideration the update rate for the trigger.
100
Operation Techniques
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