MDO3000 Programmer Manual.pdf - 第166页

Commands Listed in A lphabetical Order The following v alues can be set for low level: AFG:LOWLevel Setting V alue Load Impedance FIFTY Ohm Load Impedance HIGHZ Min Max Resolution Min Max Resolution SINE SQUare PULSe RAM…

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Commands Listed in Alphabetical Order
Conditions
MDO3000 series
with option MDO3AFG installed and MDO4000C series with
option MDO4AFG installed only.
Group
AFG
Syntax
AFG:LEVELPreset {CMOS_5_0V|CMOS_3_3V|CMOS_2_5V|ECL|TTL|USER}
AFG:LEVELPreset?
Arguments
CMOS_5_0V – standard 5-volt CMOS levels. Not available when the load
impedance is 50 Ohm.
CMOS_3_3V – standard 3.3-volt CMOS levels
CMOS_2_5V – standard 2.5-volt CMOS levels
USER–user-defined.
ECL – -1.7 to -0.9 volts (note the full range is not available in 50 Ohm – actual is
-1.65 to -0.85. See table below.
TTL – 5.0 volts. Not available when the load impedance is 50 Ohm.
Note: The TTL standard power supply is 5V. Since the Typical standard is >2.6V
for high, this is unachievable in 50 Ohm mode. See table below.
Returns
Once any of the vertical settings are changed from the preset values, or the output
load impedance is changed, the query form returns
USER.
Examples
AFG:LEVELPRESET CMOS_3_3V sets the AFG preset levels to standard 3.3 volt
CMOS levels for the AMPLitude, OFFSet, HIGHLevel and LOWLevel settings.
AFG:LOWLevel
This command sets (or queries) the low level value of the output waveform, in
volts, when using the arbitrary function generator feature. The low level value
is constrained by the requirements for amplitude and offset; updating thisvalue
changes the amplitude and offset values.
To set or query the amplitude or offset values, use the commands AFG:AMPLitude
and AFG:OFFSet.
NOTE. The AFG:OUTPut:LOAd:IMPEDance command must be used before
using any of the amplitude/offset/highLevel/lowLevel/Preset commands, so that
saved setups are recalled with the proper load factor applied.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-135
Commands Listed in Alphabetical Order
The following v
alues can be set for low level:
AFG:LOWLevel Setting Value
Load Impedance
FIFTY Ohm
Load Impedance
HIGHZ
Min Max Resolution Min Max Resolution
SINE
SQUare
PULSe
RAMP
NOISe
DC
1
HAVERSINe
CARDIac
ARBitrary
-2.5V 1.24V 1mV -5.0V 2.49V 2mV
SINC (Sin(x )/x)
-1.518V 1.248V 1mV -3.036V 2.496V 2mV
LORENtz
-1.233V 1.266V 1mV -2.466V 2.532V 2mV
GAUSsian
ERISe
EDECAy
-1.25V 1.24V 1mV -2.5V 2.5V 2mV
1
When the :AFG:FUNCtion is specified as DC, a change to the AFG:LOWLevel value results in a corresponding c hange to : AFG:OFFset. A corresponding
change to :AFG:AMPLitude is remembered but is not applied until the :AFG:FUNCtion is changed to a function other than DC.
Conditions
MDO3000 series with option MDO3AFG installed and MDO4000C series with
option MDO4AFG installed only.
Group
AFG
Syntax
AFG:LOWLevel <NR3>
AFG:LOWLevel?
Arguments
Floating point number that represents the AFG low level value, in volts.
Examples
AFG:LOWLEVEL 1.0 sets the AFG low level value to 1.00 volts.
AFG:NOISEAdd:PERCent
Sets (or queries) the AFG additive noise level as a percentage. Minimum is 0.0%,
maximum is 100.0% and increment is 1.0%.
2-136 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
The maximum noi
se percent is limited when AFG:AMPLitude is greater than
50% of its maximum setting value for the current function, in accordance with
the following formula:
Noise Percent Max = 100.0 * (Amplitudemax/Amplitude – 1.0)
Conditions
MDO3000 series with option MDO3AFG installed and MDO4000C series with
option MDO4AFG installed only.
Group
AFG
Syntax
AFG:NOISEAdd:PERCent <NR3>
AFG:NOISEAdd:PERCent?
Arguments
Floating point number that represents the AFG additive noise level, as a
percentage.
Examples
AFG:NOISEADD:PERCENT 50 sets the AFG additive noise level to 50 percent.
AFG:NOISEAdd:STATE
Sets (or queries) the AFG additive noise state.
Conditions
MDO3000 series with option MDO3AFG installed and MDO4000C series with
option MDO4AFG installed only.
Group
AFG
Syntax
AFG:NOISEAdd:STATE {0|1|OFF|ON}
AFG:NOISEAdd:STATE?
Arguments
1 orON turns on the AFG additive noise state.
0 or OFF turns it off.
Examples
AFG:NOISEADD:STATE ON turns on the additive noise state.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-137