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24 Agilent E1441A Application Information
Chapter 2
the maximum value allowed with the present offset voltage. (Vmax is either
10 volts for a high impedance termination or 5 volts for a 50 ohm
termination; Vpp is the output amplitude in volts peak-to-peak.)
A -221, “Settings conflict” error is generated and the amplitude is adjusted.
A momentary glitch occurs in the output waveform at certain voltages due
to output attenuator switching. This positive-going glitch occurs when the
output voltage crosses the break-point voltage either from a lower voltage or
a higher voltage. The voltages are shown below (inVpp) for a 0 volt dc
offset: .252, .399, .502, .796, 1, 1.59, 2.0, 3.17, 3.99, 6.32, 7.96
The output voltage will momentarily drop to 0 volts at certain voltages due
to output relay switching. This occurs when the output voltage crosses the
break-point voltage either from a lower voltage or a higher voltage. The
voltages are shown below (in Vpp) for a 0 volt dc offset:
.317, .632, 1.26, 2.52, 5.02
You can set the units for output amplitude to Vpp, Vrms, or dBm. See
“Output Units” on page 25. for more information.
For dc volts, the output level is actually controlled by setting the offset
voltage. You can set the dc voltage to any value between
±5 Vdc into
50 ohms or
±10 Vdc into an open circuit. See “DC Offset Voltage” on
page 24. for more information.
Use the following command to set the output amplitude:
VOLTage <amplitude>|MINimum|MAXimum
You can also use the APPLy command to select the function, frequency,
amplitude, and offset with a single command. Because the APPLy command
also changes duty cycle, modulation type, trigger source, and trigger slope,
you must place the APPLy command first in any sequence of configuration
commands.
DC Offset Voltage At power-on, the dc offset is set to 0 volts. You can set the offset to a positive
or negative number with the restrictions shown below. If the specified offset
voltage is not valid, the function generator will automatically adjust it to the
maximum dc voltage allowed with the present amplitude. (Vmax is either 10
volts for a high impedance termination or 5 volts for a 50 ohm termination;
Vpp is the output amplitude in volts peak-to-peak.)
A -221, “Settings conflict” error is generated and the offset is adjusted.
DC Offset and Output Termination: The offset voltage is automatically
adjusted (and no error is generated) if you change the output termination.
For example, if you set the offset to 100 mVdc and then change the
V
offset
V
pp
2
--------
+ V
max
≤ and V
offset
2V
pp
≤
V
offset
V
pp
2
--------
+ V
max
≤ and V
offset
2V
pp
≤