MI 2892 Power Master
Recording Practice and Instrument Connection
110
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 Power Master 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 occurs 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 3.22.2 for instruction regarding time and date
settings).
Step 2: Measurement setup
Measurement setup adjustment is performed on measured site, after we find out details regarding
nominal voltage, currents, type of wiring etc.
Step 2.1: Synchronization and wiring
Connect current clamps and voltage tips to the “Device under measurement” (See section 4.2
for details).
Select proper type of connection in “Connection setup” menu (See section 3.21.1 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 3.21.1 for details).
Select System frequency. System frequency is default mains system frequency. Setting this
parameter is recommended if to measure signalling or flickers.
Step 2.2: Nominal voltage and ratio
Select instrument nominal voltage according to the network nominal voltage.
Note: For 4W and 1W measurement all voltages are specified as phase-to-neutral (L-N). For 3W
and Open Delta measurements all voltages are specifies as phase-to-phase (L-L).
Note: Instrument assures proper measurement up to 150 % of chosen nominal voltage.
In case of indirect voltage measurement, select appropriate “Voltage ratio” parameters,
according to transducer ratio. (See section 3.21.1 and 4.2.2 for details).
Step 2.3: Current clamps setup
Using “Select Clamps” menu, select proper Phase and Neutral channel current clamps (see
sections 3.21.1 for details).
Select proper clamps parameters according to the type of connection (see section 4.2.3 for
details).
Step 2.4: Event setup
Select threshold values for: swell, dip and interrupts (see sections 3.21.2 and 3.17 for details).
Note: You can also trigger WAVEFORM RECORDER on events. Instrument will then capture waveform
and inrush for each event.
