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4 - Front Panel Operation
48
2 - Setting the Output Frequency
When you turn on the ac source, the default output frequency is a 60 Hz. Assuming the voltage output
from example 1 is in effect (120 Vrms sinewave), change the frequency to 50 Hz as follows:
Action Display
You can set the frequency in the same way that you set the voltage:
1.
On the Function keypad, press Freq. On the Entry keypad, press 5 0 Enter.
FREQ 50
2.
On the Function keypad, press Freq. On the Entry keypad, press ¯ or ° to
increment or decrement the existing value.
FREQ 50
3.
Rotate the front panel Frequency knob to obtain 50 Hz.
FREQ 50
To verify the output, use the meter menu:
4. The Meter menu is presently displaying the measured voltage and frequency of the
selected output phase. Press and ô to scroll through all of the measurement
functions in the Meter Menu.
120 V 50 Hz
3 - Setting the DC Offset
NOTE: Because the maximum voltage that the ac source can output is limited to 425 V
peak
, you
cannot program a dc offset that will cause a previously programmed ac voltage to exceed
the 425 V
peak
limit (ac
peak
+ offset ≤ 425 V).
The dc output capability of the ac source lets you independently control the dc and ac components of the
output voltage. Program a dc offset of 100 V as follows:
Action Display
1.
On the Function keypad, press Voltage and then press ô until you access the
OFFSET command.
OFFSET 0
2.
On the Entry keypad, press 1 0 0 Enter.
OFFSET 100
3.
On the Function keypad, press Shift Output to access the output coupling command.
Note: When the output coupling is set to ac, the ac source regulates the dc output
voltage to 0, regardless of any programmed voltage offset.
OUTP:COUP AC
4.
Press ° and Enter to change the output coupling to DC.
OUTP:COUP DC
5. The ac source output now combines the previously programmed ac rms voltage and
the dc offset voltage. This is indicated by the OUTPUT AC+DC annunciator. The
front panel meter is measuring a 120 Vrms sinewave offset by 100 Vdc. This is
indicated by the METER AC+DC annunciator.
156 V 50 Hz
To measure just the ac or just the dc portion of the output:
6.
On the Function keypad, press Input to access the metering functions.
INP:COUP ACDC
7.
Press ° until you access the DC parameter and press Enter. This changes the
metering function to dc, which measures just the dc portion of the output in volts.
The meter annunciator indicates METER AC
INP:COUP DC
100 V 50 Hz
8.
Press Input again. Press ° until you access AC and press Enter. This changes the
metering function to ac, which measures just the ac portion of the output in rms volts.
The meter annunciator indicates METER DC
INP:COUP AC
120 V 50 Hz