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4 - Front Panel Operation
42
Procedure for Three-Phase AC Sources
If you have a three-phase ac source, you can set the rms voltage of all three phases identically, or set each
one differently. This is controlled via the Phase Select Menu on the Function keypad.
The following example shows how you can set the phase 1 output to 120 Vrms, phase 2 to 180 Vrms,
and phase 3 to 235 Vrms.
Action Display
1.
On the Function keypad, press Voltage. Note that in the power-on default state, the
φ
1,
φ
2, and
φ
3 annunciators are all lit, indicating that any command sent to the
instrument will be sent to all three phases.
VOLT 0
2.
Scroll through the phase selections by pressing Phase Select
Pressing Phase Select moves you through phases 1, 2, and 3, as indicated by the
phase annunciators. Pressing it once more returns you to the first state with all three
phase annunciators on.
VOLT 0
3.
While in the Voltage menu press Phase Select to access Phase 1. On the Entry pad
press 1 2 0 Enter.
VOLT 120
4.
Access the Voltage menu again and press Phase Select once to access Phase 2. On
the Entry pad press 1 8 0 Enter.
VOLT 180
5.
Access the Voltage menu again and press Phase Select once to access Phase 3. On
the Entry pad press 2 3 5 Enter.
VOLT 235
6.
Press Output On/Off to enable the output. The Dis annunciator will go off,
indicating that the voltages are now applied to the output terminals.
235 V 60 Hz
To verify the output, you can measure it as follows:
7.
Note that the
φ
3 annunciator is on, indicating that you are monitoring the last phase
you selected, which was Phase 3.
235 V 60 Hz
8.
Press Phase Select once. The
φ
1 annunciator will light, indicating that you are
now monitoring Phase 1.
120 V 60 Hz
9.
Press Phase Select once. The
φ
2 annunciator will light, indicating that you are
now monitoring Phase 2.
180 V 60 Hz
10.
Press Phase Select once. The
φ
3 annunciator will light, indicating that you are
now monitoring Phase 3 again.
235 V 60 Hz
NOTE: The Meter menu does not go to the all-phases state present in the Phase Select menu
because the front panel can display only one phase at a time. Refer to the ac source
Programming Guide on how to return simultaneous measurements from all three phases.