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Agilent E1441A Application Information 25
Chapter 2
termination from 50 ohms to “high impedance”, the displayed offset will
double to 200 mVdc. If you change from “high impedance” to 50 ohms, the
displayed offset will drop in half. See “Output Termination” 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.
Use the following command to set the dc offset:
VOLTage:OFFSet <offset>|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.
Output Units Applies only to output amplitude (does not affect offset). At power-on,
the units for output amplitude are volts peak-to-peak.
Output units:
Vpp, Vrms, or dBm. The default is Vpp.
The unit setting is stored in volatile memory; the units are set to “Vpp” when
power has been off or after a remote interface reset.
Use the following command to select the units of the output signal:
VOLTage:UNIT VPP|VRMS|DBM|DEFault
Output Termination Applies only to output amplitude and offset voltage. The function generator
has a fixed output impedance of 50 ohms on the OUTPUT terminal. You can
specify whether you are terminating the output into a 50 ohm load or an open
circuit. Incorrect impedance matching between the function generator and
your load will result in an amplitude or offset which does not match the
specified signal level.
Output termination: 50
Ω or High impedance. The default is 50Ω. See Table
2-4 for a list of amplitude limits for all functions.
The output termination setting is stored in volatile memory; 50
Ω is selected
when power has been off or after a remote interface reset.
The amplitude (or dc offset) is automatically adjusted (and no error is
generated) if you change the output termination. For example, if you set the
amplitude to 10 Vpp and then change the termination from 50 ohms to “high
impedance”, the amplitude will double to 20 Vpp. If you change from “high
impedance” to 50 ohms, the amplitude will drop in half.
If you specify a 50 ohm termination but are actually terminating into an open
circuit, the output will be twice the value specified. For example, if you set
the offset to 100 mVdc (and specify a 50 ohm termination) but do not
connect a 50 Ω load, the actual offset will be 200 mVdc.