Output Configuration; Output Type - Stanford Research Systems DS360 Operating Manual And Programming Reference

Output Configuration

This section describes how to configure the output type and source impedance of the DS360.

Output Type

The DS360 has two different output types: unbalanced and balanced. The currently
selected output type is indicated by the LED in the OUTPUT section. To change to the
other output selection, press [∨] output down key. The significance of the different
output types is listed below.
Unbalanced Output
An unbalanced output signal refers to a signal that is referenced to a common DC
potential. Peak-to-peak or RMS voltages are measured to that common level. Most
normal function generators use this configuration. Both the positive and negative outputs
of the DS360 have the selected source impedance and output voltage amplitude present.
The two signals are equivalent, the only difference being that the positive signal is 180°
out of phase with the negative signal.
When the unbalanced output is selected, the amplitude limits are set to the unbalanced
output values. The offset function is available. Offsets are the same polarity for both
outputs (a +2 V
Balanced Output
A balanced output signal refers to a signal that is measured to another signal, not a
common DC potential, although one may be present. Peak-to-Peak or RMS voltages are
measured from signal to signal instead of signal to common. This configuration is used
for many audio applications. Typically the measured voltage will be twice the voltage (or
+6 dB) from each signal to a common signal. The output voltage and source impedance
is measured between the positive and negative outputs on the DS360. The signals are the
same as for the unbalanced case (albeit a different amplitude), however their amplitude is
measured differently.
When the balanced output is selected, the amplitude limits are set to the balanced output
values. The offset function is not active, since offset has no meaning for a balanced
output.
Digital Output (Opt. 01)
Pressing [SHIFT
the front panel analog output and enables the rear panel digital output, indicated by the
OUTPUT LED's. Pressing [SHIFT
analog output mode. See Chapter 5 for information on configuring and operating the
digital output.
offset will offset both the positive and negative outputs by 2 volts).
DC
]
[∨] output down key selects the DS360's digital output. This disables
]
[∨] output down key again returns the unit to the
DS360 Ultra Low Distortion Function Generator
Operation 3-9