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36 U2761A User’s Guide
2 Features and Functions
Output Termination
This configuration applies to output amplitude and offset
voltage only. The U2761A has a fixed series output
impedance of 50 Ω to the device output connector. If the
actual load impedance is different from the specified value,
the amplitude and offset levels will be incorrect.
• The range of the output termination is 1 Ω to 10 kΩ, or
Infinite. The default value is 50
Ω
.
• The output termination setting is stored in volatile
memory and upon power-off or after a remote interface
reset, the setting will return to a default value.
• If you specify a 50 Ω termination but are actually
terminating into an open circuit, the actual output will be
twice the value specified.
For example, if you set the offset to 100 mVDC (and
specify a 50 Ω load) but are terminating the output into
an open circuit, the actual offset will be 200 mVDC.
• If you change the output termination setting, the output
amplitude and offset levels are automatically adjusted (no
error will be generated).
For example, if you set the amplitude to 5 Vpp and then
change the output termination from 50 Ω to “high
impedance”, the amplitude value will double to 10 Vpp. If
you change from “high impedance” to 50 Ω, the displayed
amplitude value will drop to half.
• You cannot specify the output amplitude in dBm if the
output termination is currently set to “high impedance”.
The units are automatically converted to Vpp.