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Nieaf-Smitt PHA 3300 Manual

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SECTION VI THEORY OF OPERATION
Utrecht
- Page
56 - Ref 001
5. POWER BREAKS RECORDING
If data logging is in progress, the start of every OFF state of the instrument is treated as a
Power Break. This OFF state occurs either if the instrument is switched OFF (using the
rotary switch) or if it lose its power supply.
For each Power Break, the instrument logs the date & time of both the beginning and end
of the power break, and the cause of the power break (manual or loss of supply).
Note: The battery must be in the instrument, otherwise its power supply drops to
fast and it can not record Power Breaks
6. MEMORY USAGE
The non-volatile memory in the Instrument can be used in one of two ways:
• Linear mode
In linear mode recording, the Instrument stores data in memory until full and then
stops recording. Thus the oldest data is always preserved irrespective of the
amount of recordable data.
• Roll-over mode
When recording in roll-over mode, the Instrument will over-write old data when
memory is filled. Thus, the latest data is always preserved irrespective of the
amount of data recorded, with the older data being possibly lost.
Data logging capacity in linear mode depends on the number of channels selected for
recording, the type of data recorded, the IP and the number of voltages anomalies
detected. It is automatically calculated by the PC software when selecting channels for
logging and is given by the following equation:
Maximum number of records in Periodic Analysis (Rnmax) is given by:
Rn NN
R
Stat ano
len
max
()**
=
−
−
2032 1024 164
Where: Rlen Record length RXY
len
=
+
+
12 6 12**
Nstat N° of channels selected for Statistical Analysis
(All being selected for Periodic Analysis, but excluding harmonics).
Nano N° of voltage anomalies which occurred while recording.
X N° of channels selected excluding power channels (±Px, ±Qx, ±Ptot, ±Qtot, ±Stot).
Y Power channels
Note: Estimating Voltage Anomalies:
Nano 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.
… 57


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