MI 2893 / MI 2892 / MI 2885
Measurement campaign
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Figure 105: Recommended measurement practice
Step 1: Instrument setup
On site measurements can be very stressful, and therefore it is good practice to prepare measurement
equipment in an office. Preparation of MI 2893/MI 2892/MI 2885 include following steps:
Visually check instrument and accessories.
Warning: Don’t use visually damaged equipment!
Always use batteries that are in good condition and fully charge them before you leave an office.
Note: In problematic PQ environment where dips and interrupts frequently occur instrument
power supply fully depends on batteries! Keep your batteries in good condition.
Download all previous records from instrument and clear the memory. (See section 3.19 for
instruction regarding memory clearing).
Set instrument time and date. (See section 3.24.2 for instruction regarding time and date
settings).
Step 2: PQI connection
Take care for the proper connection of voltage leads and current clamps (current direction). Voltage and
current sequence should be correct to fulfil the requirements from the power quality standard positive
sequence, load or generation measurement). In case, that GPS receiver is used for accurate time
synchronisation, connect in in the proper place to enable good signal receiving.
Step 3: Measurement setup
Measurement setup adjustment is performed on measured site, after we find out details regarding
nominal voltage, currents, type of wiring etc.
Step 3.1: Connection type, synchronisation
Connect current clamps and voltage tips according to the “Device under measurement” (See
section 4.2 for details).
Select proper type of connection in “Connection setup” menu (See section 3.23.1 for
details).
Select synchronization channel. Synchronization to voltage is recommended, unless
measurement is performed on highly distorted loads, such as PWM drives. In that case
current synchronization can be more appropriate. (See section 3.23.1 for details).
Select System frequency. System frequency is default mains system frequency. Setting this
parameter is recommended if to measure signalling or flickers.
