Possible Conflict with Function Change: The output amplitude is
automatically adjusted if you select a function whose maximum
amplitude is less than that of the currently active function. This
conflict may arise when the output units are Vrms or dBm due to the
differences in crest factor for the output functions. For example, if you
output a 5 Vrms square wave (into 50 ohms) and then change the
function to sine wave, the function generator will adjust the output
amplitude to 3.535 Vrms (the upper limit for sine waves in Vrms).
From the remote interface, a -221, “Settings conflict” error is generated
and the amplitude is adjusted.
Output Amplitude and Output Termination: The output amplitude 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 displayed amplitude will double to 20 Vpp. If you change from
“high impedance” to 50 ohms, the displayed amplitude will drop in half.
See “Output Termination” on page 65 for more information.
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 (for a 0 volt dc offset):
252 mVpp, 399 mVpp, 502 mVpp, 796 mVpp, 1 Vpp, 1.59 Vpp,
2.0 Vpp, 3.17 Vpp, 3.99 Vpp, 6.32 Vpp, 7.96 Vpp
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 (for a 0 volt dc offset):
317 mVpp, 632 mVpp, 1.26 Vpp, 2.52 Vpp, 5.02 Vpp
4
Chapter 4 Remote Interface Reference
Using the APPLy Command
141
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