MI 2893 / MI 2892 / MI 2885
Measurement campaign
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Step 3.2: 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 transformer ratio. (See section 3.23.1 and 4.2.2 for details).
Step 3.3: Current clamps setup
Using “Select Clamps” menu, select proper Phase and Neutral channel current clamps (see
sections 3.23.1 for details).
Select proper clamps parameters (measuring range: automatic or fixed one) according to
the type of connection (see section 4.2.3 for details).
Step 3.4: Inspection
After setup instrument and measurement is finished, user need to re-check if everything is
connected and configured properly. Following steps are recommended:
Using PHASE DIAGRAM menu check if voltage and current phase sequence is right regarding
to the system. Additionally, check if current has right direction.
Using U, I, f menu check if voltage and current have proper values.
Check voltage and current THD.
Note: Excessive THD can indicate that too small range was chosen!
Note: In case of AD converter overvoltage or overloading current, icon
will be displayed.
Using POWER menu check signs and indices of active, nonactive, apparrent power and
power factor.
If any of these steps give you suspicious measurement results, return to Step 2 and double check
measurement setup parameters.
Step 3.5: Event setup
Select threshold values for: swell, dip and interrupts (see sections 3.23.2 and 3.17 for details).
Note: You can also trigger WAVEFORM RECORDER on events. Instrument will then capture
waveform and inrush for each event.
Step 3.6: Alarm setup
Use this step if you would like only to check if some quantities cross some predefined
boundaries (see sections 3.18 and 3.23.3 for details).
Note: You can also trigger WAVEFORM RECORDER on alarms. Instrument will then capture
waveform and inrush for each alarm.
Step 3.7: Signalling setup
Use this step only if you are interested in measuring mains signalling voltage. See section 3.23.4
for details.
Step 3.8: RVC setup
Use this step if you are interested in detection of rapid voltage changes (RVC). See section 3.23.4
for details.
