MI 2893 / MI 2892 / MI 2885
Recorders
229
6.3
Recorders
6.3.1
General recorder
Sampling
According to the IEC 61000-4-30 Class A requirements. The basic measurement
time interval for voltage, harmonics, interharmonics and unbalance is 10-cycle
time interval for a 50 Hz power system and 12-cycle time interval for a 60 Hz
power system. Instrument provides approximately 3 readings per second,
continuous sampling. All channels are sampled simultaneously. For harmonics
measurement input samples are resampled, in order to assure that sampling
frequency is continuously synchronized with main frequency.
Recording quantities Voltage, current, frequency, crest factors, power, energy, 50 harmonics, 50
interharmonics, flickers, signalling, unbalance, under and over deviation. See
section 4.4 for details which minimum, maximum, average and active average
values are stored for each parameter.
Recording interval
1 s, 3 s (150 / 180 cycles), 5 s, 10 s, 1 min, 2 min, 5 min, 10 min, 15 min, 30 min,
60 min, 120 min.
Events
All events, without limitation can be stored into record.
Alarms
All alarms, without limitation can be stored into record.
Signalling
Signalling events, without limitation can be stored into record.
Transients
(MI 2893 only)
Transients, without limitation can be stored into record.
MI 2893 only;
MI 2892/MI 2885 have realized transient recorder as independent recorder.
Inrush
Inrush currents, without limitation can be stored into record.
RVC
RVC, without limitation can be stored into record.
200 ms U/I/f
200 ms U/I/f Snapshot can be stored into record (every 60 minutes).
Trigger
Predefined start time or manual start.
Note: If during record session instrument batteries are drained, due to long interruption for example,
instrument will shut down and after electricity comes back, it will automatically restart recording
session.
Table 146: General recording max. duration
Recording interval
Max. record duration*
1 s
12 hours
3 s (150 / 180 cycles)
2 days
5 s
3 days
10 s
7 days
1 min
30 days
2 min
60 days
5 min
> 60 days
10 min
15 min
30 min
60 min
120 min
*At least 2 GB of free space should be available on microSD card.
In case, that record duration is set to “Manual”, that instrument automatically start new recorder after
the first one is finished due to reach the maximum file length. Instrument perform so many recorders, as
it is available memory on the SD card.
