MDO3000 Programmer Manual.pdf - 第237页
Commands Listed in Alphabetical Order NOTE. MDO3000 m odels only have two digital thr eshold contr ols: one for digital channels D0 - D7, and the other for D8 - D15. Changing one digital channel’ s thr eshold l e vel cha…
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
Commands Listed in Alphabetical Order
NOTE. MDO3000 m
odels 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.
Group
Bus
Syntax
BUS:THReshold:D<x> {<NR3>|ECL|TTL}
BUS:THReshold:D<x>?
Arguments
ECL specifies a preset ECL high level of -1.3V.
TTL specifies a preset TTL high level of 1.4V.
<NR3> is a floating point number that specifies the threshold level, in volts.
BUS:UPPerthreshold:CH<x>
Sets the upper threshold for each analog channel (1–4). This applies to all search
and trigger types that use the channel.
Group
Bus
Syntax
BUS:UPPerthreshold:CH<x> {<NR3>|ECL|TTL}
BUS:UPPerthreshold:CH<x>?
Arguments
<NR3> is a floating 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:UPPERTHRESHOLD:CH1 800.0000E-3 sets the CH1 upper threshold to
800 mV.
BUS:UPPERTHRESHOLD:CH1? might return :BUS:UPPERTHRESHOLD:CH1
-800.0000E-3
indicating that the CH1 upper threshold is set to -800 mV.
BUS:UPPerthreshold{:MATH|:MATH1}
This command specifies the upper threshold of the math waveform. This will
apply to all sea
rch and trigger types that use the math waveform.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-207
Commands Listed in Alphabetical Order
Group
Bus
Syntax
BUS:UPPerthreshold{:MATH|:MATH1} {<NR3>|ECL|TTL}
BUS:UPPerthreshold{:MATH|:MATH1}?
Related Commands
BUS:LOWerthreshold{:MATH|:MATH1}
Arguments
<NR3> is a floating point number that specifies the upper threshold of the math
waveform, in volts.
ECL – ECL (-1.3 volts). Note that this setting is constrained, depending upon the
vertical scale for the specified math waveform.
TTL – TTL (1.4 volts). Note that this setting is constrained, depending upon the
vertical scale for the specified math waveform.
Examples
BUS:UPPerhreshold:MATH TTL sets the upper threshold for the math
waveform to 1.4000 volts.
BUS:UPPerhreshold:MATH? might return 0.0E+0, which is the default.
BUS:UPPerthreshold:REF<x>
This command sets the upper threshold for each reference waveform. This applies
to all search and trigger types that use that reference waveform.
Group
Bus
Syntax
BUS:UPPerthreshold:REF<x> {<NR3>|ECL|TTL}
BUS:UPPerthreshold:REF<x>?
Related Commands
BUS:LOWerthreshold:REF<x>
Arguments
<NR3> is a floating point number that specifies the upper 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.
2-208 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual