Agilent Technologies 6813B, 6811B, 6812B manual Setting the Output Frequency, Setting the DC Offset

4 - Front Panel Operation

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	FREQ	50
	increment or decrement the existing value.
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	120 V	50 Hz
	selected output phase. Press ￿ and  to scroll through all of the measurement

functions in the Meter Menu.

3 - Setting the DC Offset

NOTE: Because the maximum voltage that the ac source can output is limited to 425 Vpeak, you cannot program a dc offset that will cause a previously programmed ac voltage to exceed

the 425 Vpeak limit (acpeak + 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

1.On the Function keypad, press Voltage and then press  until you access the OFFSET command.

2.On the Entry keypad, press 1 0 0 Enter.

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.

4.Press ° and Enter to change the output coupling to 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.

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.

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

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

Display

OFFSET 0

OFFSET 100

OUTP:COUP AC

OUTP:COUP DC

156 V 50 Hz

INP:COUP	ACDC
INP:COUP	DC
100 V	50 Hz
INP:COUP	AC
120 V	50 Hz

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