MDO3000 Programmer Manual.pdf - 第235页
Commands Listed in Alphabetical Order Arguments <NR3> i safl o a t i ng point number that specifies the threshold, in volts. ECL specifies a pre set ECL high level of -1.3V . TTL specifies a prese t TTL high leve l of …
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
Commands Listed in Alphabetical Order
Syntax
BUS:LOWerthre
shold:REF<x> {<NR3>|ECL|T TL}
BUS:LOWerthreshold:REF<x>?
Related Commands
BUS:UPPerthreshold:REF<x>
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 for the specified reference waveform.
TTL – TTL (1.4 volts). Note that this setting is constrained, depending upon the
vertical scale for the specified reference waveform.
Examples
BUS:LOWerthreshold:REF2 TTL sets the lower threshold for reference
waveform 2 to 1.4 volts. Note that this setting is constrained, depending upon the
vertical scale for the specified reference waveform.
BUS:LOWerthreshold:REF3? might return 0.0E+0, which is the default.
BUS:THReshold:CH<x>
This command specifies the threshold for analog channel <x>, where x is the
channel number (1–4). This setting applies to all trigger types that use the channel.
Conditions
This command requires a serial bus analysis module on DPO models.
Group
Bus
Syntax
BUS:THReshold:CH<x> {ECL|TTL|<NR3>}
BUS:THReshold:CH<x>?
Arguments
ECL specifies a preset ECL high level of –1.3V.
TTL specifies a TTL preset high level of 1.4V.
<NR3> is a floating point number that specifies the threshold level, in volts.
BUS:THReshold:D<x>
This command specifies the threshold for digital channel <x>, where x is the
digital channel number (0–15). This will apply to all Search and Trigger Types
that use the channel.
2-206 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual