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User Manual
3.8 Basic Initial Functional Test
CAUTION:
present on the input and output during this test.
Refer to Figure 3-5 for the required functional test set up. Make sure the correct sense connection is
present if External Sense mode is selected. If Internal Sense mode is used, no sense connection is
required but some voltage drop may occur at the load connection. In that case, the scope and meter
connection should be made at the output terminal strip of the power source.
Proceed as follows to perform a basic function check of the power system:
1. Verify the correct AC line input rating on the nameplate at the rear panel. Make sure the correct
line voltage is selected before applying input power. The 2253iX is auto ranging so will accept 115
VAC, 208VAC or 230VAC. If 115VAC is used, full power is reduced.
2. Connect a suitable resistive or other type load to output phase A of the unit. Suggested load
values for both voltage ranges are shown in Table 3-12. Make sure the power resistor has
sufficient power dissipation capability for full load test and that the load used does not exceed the
maximum power rating of the AC source.
3. Connect an oscilloscope and DMM / voltmeter to the AC source output phase A and Neutral. Set
both for AC mode.
4. Turn on the power source using the On/Off switch on the front panel. Allow the power source to
initialize.
5. Use the PHASE button to either select phase A only (LED A on) or all three phases (All phase
LED's lit).
6. Set the output voltage to 0 volt and close the output relay with the OUTPUT ON/OFF button.
There should be little or no output although the DMM may show a noise level, especially if the
DMM is in auto ranging mode.
7. Select the Set screen and use the keypad to program a small voltage (20 VAC). Observe the
DMM reading. The reading should track the programmed voltage.
8. Also monitor the scope display. The output signal should be a sinusoidal voltage waveform.
9. If the output tracks, increase the voltage until you reach 115V on the low voltage range or 230V on
the high voltage range. Check the output voltage reading and waveform.
10. Select the measurement screen by pressing the Meas button. The output voltage, current and
power will be displayed. For phase B and C, use the PHASE button to select the correct phase
measurement display.
11. Repeat for Phase B and C as needed.
In the unlikely event the power source does not pass the functional test, refer to the calibration
procedure in Section 6 or call California Instrument's customer satisfaction department for further
assistance.
California Instruments
Work carefully when performing these tests; hazardous voltages are
2253i / 2253iX
45
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