HP 33120A, User Manual

Page: 51 / 118

Output Amplitude
(continued)
•
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.
•
Offset Voltage Restrictions : The output amplitude (in Vpp) and the
dc offset voltage must obey the following restrictions. If the specified
amplitude is not valid, the function generator will automatically
adjust it to the maximum value allowed with the present offset
voltage. (V
max is either 10 volts for a high impedance termination
or 5 volts for a 50 ohm termination; V pp is the output amplitude in
volts peak-to-peak.)
From the front panel, “
MAX VALUE
” is displayed and the amplitude
is adjusted. From the remote interface, 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 (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

V
offset

+
V
pp
2
≤
V
max
and

V
offset

≤
2
x
V
pp
Chapter 3 Features and Functions
Output Configuration
60