HP E1340A User's Manual
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Program Comments
The following comments give additional details on the program examples in
this chapter.
Reference
Oscillator Sources
• The SINusoid, SQUare, TRIangle, and RAMP functions can use any
of the Reference Oscillator Sources. The sources, selected by
[SOURce:]ROSCillator:SOURce, are:
INTernal - 42.94967296 MHz (power-on value)
EXTernal - User provided value (the front panel “Aux In” BNC)
• If using the EXTernal reference oscillator source, enter the source
frequency to the AFG using
[SOURce:]ROSCillator:FREQuency:EXTernal <frequency>.
Output Load
Comments
• For correct output amplitude values, the load applied to the AFG
“Signal Output” terminals must be the same value as the selected
AFG output impedance value.
• To output to an open circuit, execute OUTPut:LOAD INFinity or
9.9E+37. The HP E1340A then outputs the correct amplitude and
offset for an open circuit. The amplitude and offset range are
doubled while resolution worsens by a factor of 2.
Output Units
Comments
• The selected unit type can be overridden by sending a unit suffix
with the amplitude command. For example, if the selected unit is
VPP, sending:
[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude] 5V
changes the unit type to volts (i.e., V) for that command. However,
the default unit type remains in effect for subsequent amplitude
commands that are sent without the unit suffix.
• The V (volts) suffix and VPK (volts peak) suffix generate the same
amplitude values for all time varying waveforms like
SINusoid,
SQUare, TRIangle, and RAMPS.
• The default unit type only applies for amplitudes and not for offsets.
The unit for offsets must always be specified in “
V” for volts. For
example, executing:
[SOURce:]VOLTage:OFFSet .1VPP
causes an error. To prevent the error, execute either:
[SOURce:]VOLTage:OFFSet 0.1
or
[SOURce]:VOLTage:OFFSet 0.1V
Chapter 2 Generating Standard Waveforms with the HP E1340A 52