MDO3000 Programmer Manual.pdf - 第234页
Commands Listed in A lphabetical Order Examples BUS:B1:USB:SO URCE:DMINUS CH2 sets the source to channel 2. BUS:B1:USB:SO URCE:DMINUS? might return :BUS:B1:USB:SOU RCE :DMINUS CH4 indicatin g that channel 4 is the source…
Commands Listed in Alphabetical Order
Syntax
BUS:B<x>:USB:
SOUrce:DIFFerential
{CH1|CH2|CH3|CH4|MATH|REF1|REF2|REF3|REF4}
BUS:B<x>:USB
:SOUrce:DIFFerential?
Arguments
CH1–4 specifies an analog waveform as the source. This channel should have
an attached differential probe.
MATH specifies the math waveform as the source.
REF1–4 specifies a reference waveform as the source.
Examples
BUS:B1:USB:SOURCE:DIFFERENTIAL CH2 sets the source to channel 2. You
should have a differential probe attached to channel 2 and connect it to the USB
data signal.
BUS:B1:USB:SOURCE:DIFFERENTIAL? might return
:BUS:B1:USB:SOURCE:DIFFERENTIAL CH4 indicating that channel 4 is
the source.
BUS:B<x>:USB:SOUrce:DMINus
This command specifies the source for the USB bus D- input. If you are using
single-ended probes, you need to set the sources for both the D+ and D- inputs.
Conditions
This command requires a DPO4USB application module for 4000 series models,
and an MDO3USB application module for MDO3000 series models.
Group
Bus
Syntax
BUS:B<x>:USB:SOUrce:DMINus
{CH1|CH2|CH3|CH4|D0|D1|D2|D3|D4|D5|D6|D7|D8
|D9|D10|D11|D12|D13|D14|D15}
BUS:B<x>:USB:SOUrce:DMINus?
Arguments
CH1–CH4 specifies an analog channel as the source waveform for the D- input.
D0-D15 specifies a digital channel as the source waveform for the D- input.
(MSO/MDO4000/B models only as well as MDO3000 and MDO400C models
with option MDO3MSO or MDO4MSO installed.)
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-203
Commands Listed in Alphabetical Order
Examples
BUS:B1:USB:SO
URCE:DMINUS CH2
sets the source to channel 2.
BUS:B1:USB:SOURCE:DMINUS? might return :BUS:B1:USB:SOU RCE:DMINUS
CH4
indicatin
g that channel 4 is the source.
BUS:B<x>:USB:SOUrce:DPLUs
This command specifies the source for the USB D+ input. If you are using
single-end
ed probes, you need to set the sources for both the D+ and D- inputs.
Conditions
This command requires a DPO4USB application module for 4000 series models,
and an MDO3USB application module for MDO3000 series models.
Group
Bus
Syntax
BUS:B<x>:USB:SOUrce:DPLUs
{CH1|CH2|CH3|CH4|D0|D1|D2|D3|D4|D5|D6|D7|D8
|D9|D10|D11|D12|D13|D14|D15}
BUS:B<x>:USB:SOUrce:DPLUs?
Arguments
CH1–CH4 specifies an analog channel as the source waveform for D+ input.
D0-D15 specifies a digital channel as the source waveform for D+ input.
(MSO/MDO4000/B models only as well as MDO3000 and MDO400C models
with option MDO3MSO or MDO4MSO installed.)
Examples
BUS:B1:USB:SOURCE:DPLUS CH1 sets the D+ source to channel 1.
BUS:B1:USB:SOURCE:DPLUS? might return : BUS:B1:USB:SOURCE:DPLUS
CH3
indicating that channel 3 is the source.
BUS:LOWerthreshold:CH<x>
This command sets the lower threshold for each channel. This applies to all search
and trigger types that use the channel.
Group
Bus
Syntax
BUS:LOWerthreshold:CH<x> {<NR3>|ECL|TTL}
BUS:LOWerthreshold:CH<x>?
2-204 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 threshold, in volts.
ECL specifies a preset ECL high level of -1.3V.
TTL specifies a preset TTL high level of 1.4V.
Examples
BUS:LOWERTHRESHOLD:CH1 TTL sets the CH1 lower threshold to 800mV.
BUS:LOWERTHRESHOLD:CH1? might return :BUS:LOWERTHRESHOLD:CH1
-800.0000E-3
indicatingtheCH1lowerthresholdis-800mV.
BUS:LOWerthreshold{:MATH|:MATH1}
This command specifies the lower threshold for the math waveform. This will
apply to all search and trigger types that use the math waveform.
Group
Bus
Syntax
BUS:LOWerthreshold{:MATH|:MATH1} {<NR3>|ECL|TTL}
BUS:LOWerthreshold{:MATH|:MA
TH1}?
Related Commands
BUS:UPPerthreshold{:MATH|:MATH1}
Arguments
<NR3> is a floating point number that specifies the lower threshold for the
reference waveform, in volts.
ECL – ECL (-1.3 volts). Note that this setting is constrained, depending upon the
vertical scale of the specified math waveform.
TTL – TTL (1.4 volts). Note that this setting is constrained, depending upon the
vertical scale of the specified math waveform.
Examples
BUS:LOWerthreshold:MATH TTL sets the lower threshold for the math
waveform to 1.4 volts.
BUS:LOWerthreshold:MATH? might return 0.0E+0, which is the default.
BUS:LOWerthreshold:REF<x>
This command sets the lower threshold for each reference waveform. This applies
to all search and trigger types that use that reference waveform.
Group
Bus
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-205