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E1437A
ASCII Overview and Commands
NOTE
If an INPUT:RANGE:AUTO command is pending or in progress it is aborted
when an INPUT:RANGE or INPUT_RANGE? command is received.
INPUT_RANGE? also returns an error if an autorange is pending or in progress.
parameter
Comments:
To ensure full alias-free operation the analog anti-alias filter should be ON unless
the application inherently bandlimits the input signal to less than fs/2. The analog
anti-alias filter has a fixed bandwidth and thus is fully effective only when fs≥20
MHz. If a slower external ADC clock is used, an additional analog filter of the
appropriate bandwidth may be required for full alias protection.
When using the analog anti-alias filter, the range parameter may need to be set
higher than the actual range of the input signal. The reason for this is that step
changes of input voltage cause an overshoot and ringing response at the output of
the anti-alias filter. The peak overshoot will actually exceed the input voltage step
by about 20%. The range setting must accommodate this overshoot to avoid an ADC
overflow.
Reset Values:
range=10.24, coupling=DC, alias=ON, signal=ON, float=OFF
See Also
INPUT:RANGE:AUTO
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Full scale
Range
voltage
0
1
2
3
4
5
6
1.28
7
2.56
8
5.12
9
10.24
determines whether or not the input signal is sent to the buffer amplifier.
value
OFF redirects the input signal to a dummy 50 Ohm load, and feeds the buffer amplifier
from an internally grounded 50 Ohm source resistance. The signal OFF setting is useful for
0
making reference measurements without the signal applied. When using AC coupling the
0.2 µF capacitor remains between the input connector and its 50 Ohm termination.
1
ON attaches the input signal to the 50 Ohm buffer amplifier.
Full Scale dBm
−24
.02
−18
.04
−12
.08
−6
.16
.32
0
.64
6
12
18
24
30
signal parameter definition
INPUT:SETUP
command/query
5-33
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