MDO3000 Programmer Manual.pdf - 第253页
Commands Listed in Alphabetical Order Syntax CH<x>:INVert { ON|OFF} CH<x>:INVert? Arguments OFF sets the invert function for channel <x> to off. ON sets the invert function for channel <x> to on. …
Commands Listed in Alphabetical Order
channel that ha
s no probe attached or a probe that does not support DCREJect
coupling attached results in a settings conflict error event and the coupling
remains unchanged.
Examples
CH2:COUPLING AC sets channel 2 to AC coupling.
CH3:COUPling? might return :CH3:COUPling DC indicating that channel 3
is set to DC coupling.
CH<x>:DESKew
This command specifies the deskew time for channel <x>, where x is the
channel number (1–4). You can adjust the deskew time to add an independent,
channel-based delay time to the delay (set by the horizontal position control and
common to all channels) from the common trigger point to first sample taken for
each channel. This lets you compensate individual channels for different delays
introduced by their individual input hook ups.
Group
Vertical
Syntax
CH<x>:DESKew <NR3>
CH<x>:DESKew?
Arguments
<NR3> is a floating point number that specifies the deskew time for channel <x>,
ranging from -100 ns to +100 ns with a resolution of 1 ps.
Examples
CH4:DESKew 5.0E-9 sets the deskew time for channel 4 to 5 ns.
CH2:DESKew? might return :CH2 :DESKEW 2.00 00E-09 ind
icating that the
deskew time for channel 2 is set to 2 ns.
CH<x>:INVert
This command specifies the invert function for channel <x>, where is the channel
number (1–4) . When on, the invert function inverts the waveform for the
specified channel.
NOTE. This command inverts the waveform for display purposes only. The
oscilloscope does not use an inverted waveform for triggers or trigger logic inputs.
Group
Vertical
2-222 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Syntax
CH<x>:INVert {
ON|OFF}
CH<x>:INVert?
Arguments
OFF sets the invert function for channel <x> to off.
ON sets the invert function for channel <x> to on.
Examples
CH4:INVert ON inverts the waveform on channel 4.
CH2:INVert? might return :
CH2:INVERT 0
indicating that channel 2 is not
inverted.
CH<x>:LABel
This command specifies the waveform label for channel <x>, where x is the
channel number (1–4).
Group
Vertical
Syntax
CH<x>:LABel <Qstring>
CH<x>:LABel?
Arguments
<Qstring> is an alphanumeric string of text, enclosed in quotes, that contains the
text label information for the channel <x> waveform. The text string is limited
to 30 characters.
CH<x>:OFFSet
This command specifies the vertical offset for channel <x>, where x is the channel
number (1–4).
This command offsets the vertical acquisition window (moves the level at the
vertical center of the acquisition window) for the specified channel. Visualize
offset as scrolling the acquisition window towards the top of a large signalfor
increased offset values, and scrolling towards the bottom for decreased offset
values. The resolution of the vertical window sets the
offset increment for this
control.
Offset adjusts only the vertical center of the acquis
ition window for channel
waveforms to help determine what data is acquired. The oscilloscope always
displays the input signal minus the offset value.
The channel offset range depends on the vertical scale factor.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-223
Commands Listed in Alphabetical Order
Table 2-52: Cha
nnel Offset Range
Offset range
V/Div Setting 1 MΩ Input 50 Ω Inp ut
1 mV/div — 50 mV/div
±1 V ±1 V
50.5 mV/div — 99.5 mV/div
±0.5 V ±0.5 V
100 mV/div — 500 mV/div
±10 V ±5 V
505 mV/div — 995 mV/div
±5 V ±5 V
1V/div—5V/div
1
±100 V ±5 V
5.05 V/div — 10 V/div
1
±50 V
N/A
1
For 50 Ω input, 1 V/div is the maximum setting.
NOTE. The above table describes oscilloscope behavior only when no probe is
attached, and when the external attenuation factor is 1.0.
Group
Vertical
Syntax
CH<x>:OFFSet <NR3>
CH<x>:OFFSet?
Related Commands
CH<x>:POSition
Arguments
<NR3> is a floating point number that specifies the offset value for the specified
channel <x>.
Examples
CH3:OFFSet 2.0E-3 sets the offset for channel 3 to 2 mV.
CH4:OFFSet? might return :CH4 :OFFSET 1.00 00E-03 indicating that the
offset for channel 4 is set to 1 mV.
CH<x>:POSition
This co
mmand specifies the vertical position of channel <x>, where x is the
channel number (1–4). The position value is applied to the signal before it is
digitized.
Increasing the position value of a waveform causes the waveform to move up.
Decreasing the position value causes the waveform to move down. The position
value determines the vertical graticule coordinate at which input signal values,
minus the present offset setting for that channel, are displayed. For example,
2-224 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual