MDO3000 Programmer Manual.pdf - 第251页

Commands Listed in Alphabetical Order CH<x>:BANdwi dth This command speciﬁes the selectable low-pass bandwidth limit ﬁlter for channel <x>, where x is the channel number (1–4). A vailable bandwidth limits var…

Commands Listed in Alphabetical Order

Syntax

CH<x>?

CH<x>:AMPSVIAVOLTs:ENAble

This command speciﬁes the state of the amps via volts feature for the speciﬁed

channel. This feature supports measuring current via the voltage drop across a

resistor (1–4).

Group

Vertical

Syntax

CH<x>:AMPSVIAVOLTs:ENAble {<NR1>|OFF|ON}

CH<x>:AMPSVIAVOLTs:ENAble?

Arguments

OFF sets the amps via volts function for channel <x> to off.

ON sets the amps via volts function for channel <x> to on.

<NR1> = 0 sets the amps via volts function to off. Any other value sets the

functiontoon.

Examples

CH1:AMSVIAVOLTS:ENABLE ON turns on the amps via volts feature for

channel 1.

CH<x>:AMPSVIAVOLTs:FACtor

This command speciﬁes the amps via volts factor for the speciﬁed channel (1–4).

Group

Vertical

Syntax

CH<x>:AMPSVIAVOLTs:FACtor <NR3>

CH<x>:AMPSVIAVOLTs:FACtor?

Arguments

<NR3> is a double-precision ASCII string that represents the amps via volts factor.

Examples

CH1:AMPSVIAVOLTS:FACTOR 15.5 sets the amps via volts factor for channel 1

to 15.5.

2-220 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual

Commands Listed in Alphabetical Order

CH<x>:BANdwi

dth

This command speciﬁes the selectable low-pass bandwidth limit ﬁlter for channel

<x>, where x is the channel number (1–4).

Available bandwidth limits vary by model, and are also inﬂuenced by attached

probes. Furthermore, some oscilloscope models support options to increase

the analog bandwidth. The presence of those options also affects the available

bandwidth limits.

To see what the available bandwidth limits are, on the UI, push the relevant

channel's front panel button and the push the Bandwidth lower menu button, and

see what bandwidths are listed in the side menu.

Group

Vertical

Syntax

CH<x>:BANdwidth {FULl|<NR3>}

CH<x>:BANdwidth?

Arguments

FULl disables any optional bandwidth limiting. The speciﬁed channel operates

at its maximum attainable bandwidth.

<NR3> is a double-precision ASCII string. The oscilloscope rounds this value to

an available bandwidth using geometric rounding, and then uses this value to

set the upper bandwidth limit.

Examples

CH1:BANDWIDTH 20E6 sets the bandwidth of channel 1 to 20 MHz.

CH<x>:COUPling

This command speciﬁes the input attenuator coupling setting for channel <x>,

where x is the channel number (1–4).

Group

Vertical

Syntax

CH<x>:COUPling {AC|DC|DCREJect}

CH<x>:COUPling?

Arguments

AC sets channel <x> to AC coupling.

DC sets channel <x> to DC coupling.

DCREJect sets channel <x> to DC Reject coupling when a probe that supports

DC Reject coupling is attached. Attempting to set the coupling to DCREJect for a

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-221

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