Quick start manual

STER PMU Quick Start Manual Working with the instrument
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Table 4.3: 4W measurement ranges
Range name
Peak (V)
Meas. type
VT connection
Power system
150 V
235
direct / indirect
YES
LV / MV / HV
300 V
500
direct
NO
LV
1000 V
2205
direct
NO
LV
Table 4.4: 3W measurement ranges
Range name
Peak (V)
Meas. type
VT connection
Power system
260 V
410
direct / indirect
YES
LV / MV / HV
520 V
865
direct
NO
LV
1700 V
3815
direct
NO
LV
To change Voltage Transformer (for 150V/260V range only) ratio, first use / soft function keys to enter
the VT submenu, then use , and to modify primary and secondary values, as shown in the figure:
Figure 4.5: Modifying the Voltage Transformer ratios
By pressing the / soft function keys, user can alternate V/kV Primary voltage range.
4.3 CURRENT MEASUREMENT
STER PMU performs only indirect current measurements, meaning its current inputs have to be galvanically
isolated from the main circuit by using clap-on current clamps or current transducers. Current transducer 5A/1V is
used by default and is a part of the STER PMU package.
Failing to comply with the galvanic isolation requirement can result in measurement errors or even
damaging the device.
4.3.1 CURRENT RANGE AND TRANSFORMATION RATIO
Current range can be configured directly in the MEASUREMENT SETUP screen:
Figure 4.6: Measurement setup screen