MDO3000 Programmer Manual.pdf - 第332页
Commands Listed in A lphabetical Order D<x>:LABel This command specifies the waveform label for digital channel <x>, where x is the c hannel number . Conditions Requires an MSO or MDO4000/B/C model, or MDO3000…
Commands Listed in Alphabetical Order
ACDCRMS –displ
ays the RMS value of the acquired data.
DC – displays the DC value of the acquired data.
FREQuency – displays the frequency counter measurement.
OFF
Examples
DVM:MODE DC sets the mode for the DVM to DC, which displays the DC value of
the acquired data.
DVM:MOD? might return ACRMS, which indicates the mode is currently set
to ACRMS.
DVM:SOUrce
Sets (or queries) the source for the Digital Voltmeter: Channel 1 - 4.
Conditions
MDO3000 and MDO4000C only; requires DVM option key to be installed.
Group
DVM
Syntax
DVM:SOUrce {CH1|CH2|CH3 |CH4}
DVM:SOUrce?
Arguments
CH1|CH2|CH3|CH4 specify which channel to use as the source for the DVM.
Examples
DVM:SOURCE CH4 sets the DVM source to Channel 4.
D<x>
This command specifies parameters for digital channel <x>, where x is the
channel number.
Conditions
Requires an MSO or MDO4000/B/C model, or MDO3000 with option
MDO3MSO installed.
Group
Vertical
Syntax
D<x>
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-301
Commands Listed in Alphabetical Order
D<x>:LABel
This command specifies the waveform label for digital channel <x>, where x
is the channel number.
Conditions
Requires an MSO or MDO4000/B/C model, or MDO3000 with option
MDO3MSO installed.
Group
Vertical
Syntax
D<x>:LABel <Qstring>
D<x>:LABel?
Arguments
<Qstring> is an alphanumeric string of text, enclosed in quotes, that contains the
text label information for the digital channel <x> waveform. The text string is
limited to 30 characters.
Examples
D4:LABEL? might return :D4:LABEL “Clk Wfm 4”.
D<x>:POSition
This command specifies the vertical position for digital channel <x>, wherex
is the channel number.
NOTE. Unlike analog channels, which use the center baseline as the zero point,
digital channels use the bottom logic level as the zero point. Because of the slot
model used to describe digital channel position, the oscilloscope rounds off
divisions to the nearest slot.
Conditions
Requires an MSO or MDO4000/B/C model, or MDO3000 with option
MDO3MSO installed.
Group
Vertical
Syntax
D<x>:POSition <NR3>
D<x>:POSition?
2-302 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Arguments
<NR3> isafloati
ng point number that specifies the position of the digital channel,
in slot units. Use the oscilloscope front-panel controls to place the channel; then
query the channel to obtain an exact value for the position.
D<x>:THResh
old
This command specifies the logical threshold for the digital channel <x>, where x
is the digital channel number D0 – D15.
NOTE. MDO3
000 models only have two digital threshold controls: one for digital
channels D0 - D7, and the other for D8 - D15. Changing one digital channel’s
threshold l evel changes all of the channels’ levels in the same set.
Conditions
Requires an MSO or MDO4000/B/C model, or MDO3000 with option
MDO3MSO installed.
Group
Vertical
Syntax
D<x>:THReshold {ECL|TTL|<NR3>}
D<x>:THReshold?
Arguments
ECL sets the digital threshold for channel <x> to a preset ECL high level of -1.3V.
TTL sets the digital threshold for channel <x> to a preset TTL high level of 1.4V.
<NR3> is a floating point number that specifies the digital threshold for channel
<x>, in volts.
Examples
D5:THRESHOLD ECL sets the threshold for D5 digital channel to ECL levels.
D14:threshold? might return :D14:THRESHOLD 1.2500 indicating that the
threshold level for the D14 digital channel is 1.25 volts.
*ESE
Sets and queries the bits in the Event Status Enable Register (ESER). The
ESER prevents events from being reported to the Status Byte Register (STB).
For a detailed discussion on how to use registers, see Registers. (See page 3-1,
Registers.)
Group
Status and Error
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-303