Motor Drive Analyzer
Input Connections
9
To make motor drive 3-phase voltage unbalance
measurements:
1. Connect the red voltage probe to input A, the blue
voltage probe to input B, the gray voltage probe to
input C.
2. Connect the probe tip to a phase and the ground leads
of each voltage probe to another phase as shown in the
connection diagram on the screen after you select the
measurement.
3. For each phase, make sure that one probe tip and one
ground lead are connected.
To make motor drive 3-phase current unbalance
measurements:
1. Connect the current probes to the Inputs A, B and C.
2. Measure the current of each phase.
To make a motor shaft voltage measurement (MDA-550
only):
1. Connect the red VP-410 voltage probe to the input A.
2. Connect the ground lead of the voltage probe to
ground.
3. Connect a brush on top of the voltage probe.
4. Place the probe in probe holder.
5. Use the extension rod and magnetic base to keep the
probe in a fixed position and the brush in good contact
with the motor shaft.
Note
To maximize the benefit of independent isolated
floating inputs and to avoid problems caused by
improper use, see Chapter 6, Tips in the
ScopeMeter Test Tool 190 Series II Users
Manual.
For an accurate indication of the measured
signal, you must match the probe to the input
channel on the test tool.
When using probes that are not included with the
Product, see Calibrating the Voltage Probes in
the ScopeMeter Test Tool 190 Series II Users
Manual.
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