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Waveform setup
R&S
®
RTA4000
56
User Manual 1335.7898.02 ─ 08
Vert. Position Knob
Selects the parameter to be changed with the [Offset/Position (upper knob)]: "Offset" or
"Position". By default, position is set. [Preset] does not affect the assignment.
Channel <n>
Opens the channel menu.
State
Switches the selected channel on or off.
Remote command:
Coupling
Selects the input coupling, which influences the signal path between input connector
and the following internal signal stage. The current coupling of each channel is shown
in the waveform labels below the grid.
"AC"
AC coupling is useful if the DC component of a signal is of no inter-
est. AC coupling blocks the DC component of the signal so that the
waveform is centered on zero volts.
If AC coupling is set, the attenuation of passive probes has no effect,
and voltage is applied to the instrument with factor 1:1. Observe the
voltage limits, otherwise you can damage the instrument.
"DC"
With DC coupling, the input signal passes unchanged, all signal com-
ponents are shown.
Remote command:
Termination
Adjusts the input impedance of the instrument to the impedance of the DUT. If an
active Rohde
&
Schwarz probe is used, the termination is read out from the probe -
usually it is 50
Ω
.
"1 M
Ω
"
A high input resistor minimizes the loading effect on the device under
test. This value is set automatically if a passive probe is connected,
and cannot be changed.
"50
Ω
"
Used for measurement systems with characteristic impedance of
50
Ω
. The input resistor of the oscilloscope minimizes the reflections
along the signal path, and increases the accuracy of measurement
results. DC coupling is set automatically. 50
Ω
termination is indicated
in the waveform labels by an
Ω
.
Remote command:
Bandwidth
Selects the bandwidth limit. At full bandwidth, all frequencies in the specified range of
the instrument are acquired and displayed accurately with less than 3
dB attenuation.
Full bandwidth is used for most applications.
Vertical setup