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Metrel MI 2092 Power Harmonics Analyser Manual

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MI 2092 Power Harmonics Analyser Section VI Theory of operation
56
N
ano
can be estimated with experience. It depends on the quality of voltage supply
and on the user defined limits for detection of anomalies. Selection of
excessively narrow limits, or a wrong nominal voltage reference, can produce
large numbers of recorded events and reducing memory capacity.
Example 1:
The Instrument will be set to log for 7 days.
The requirement is to monitor both voltage and current changes, and harmonic
distortion, with as much detail as possible.
For optimum memory usage, just 12 channels should be set for periodic analysis.
U
1
, U
2
, U
3
, I
1
, I
2
, I
3
, thd
U1
, thd
U2
, thd
U3
, thd
I1
, thd
I2
, thd
I3
.
With this setting, the Instrument can save 24,771 records (values for 24,771 IPs).
Increasing number of channels and/or enabling Statistical Analysis would decrease
number of saved IPs.
Rn
max
= (2032) * 1024 / (12 + 12 * 6) = > 24,771
(Record Length = 12 + 12 * 6 = 84 bytes)
Thus, over a week (604,800 seconds) instrument can save a record every
30 seconds (an IP interval of 30 seconds).
604,800 seconds / 24771 = 24.4 seconds Set IP = 30 seconds
Thus, monitoring the above 12 parameters with an IP of 30 seconds will produce
20,160 records per week in memory. This will leave the following memory free:
FREE Memory = Memory Capacity - Memory Used
2032 * 1024 - 20,160 * 84 bytes
387,328 bytes.
This ‘FREE Memory’ is enough for recording 2361 Voltage Anomalies. Adding a
further channel to the recording (e.g. frequency) would leave the following memory free:
FREE Memory = Memory Capacity - Memory Used
2032*1024 - 20,160 * (84 + 12)
145,408 bytes. (Sufficient for 886 Voltage Anomalies)
… 56 …


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  • RS 232 Serial Port of meter to USB convertor is required Submitted on 10-3-2025 at 10:35

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  • RS 232 TO USB CONVERTER IS REQUIRED FOR YOUR METER HARMONICS ANALYZER Submitted on 10-3-2025 at 10:34

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