MDO3000 Programmer Manual.pdf - 第77页
Command Groups T able 2-36: Power Commands (cont.) Command Description POWer:SWLoss:TOT al:ENERGY : MIN? Returns the minimum total energy switching loss calculation POWer:SWLoss:TOT al:POWer: MAX? Returns the maximum tot…
Command Groups
Table 2-36: Power Commands (cont.)
Command Description
POWer:SWLoss:GATe:TURNON This command speci fies the gate turn on level for switching loss power measurements
POWer:SWLoss:NUMCYCles? Returns the number of cycles counted for the switching loss calculation
POWer:SWLoss:RDSon This command specifies RDSON value for use in switching loss calculations when the
conduction calculation method is RDSON
POWer:SWLoss:REFLevel:
ABSolute:GATE Mid
This command specifies the mid voltage reference level used in switching loss power
measurements in v olts
POWer:SWLoss:REFLevel:
ABSolute:LOWCurrent
This command specifies the low current reference level used in switching loss power
measurements in amperes
POWer:SWLoss:REFLevel:
ABSolute:LOWVoltage
This command speci fies the low voltage reference level used in switching loss power
measurements in v olts
POWer:SWLoss:REFLevel:
PERCent:GATEMid
This command specifies the mid voltage reference level used in switching loss power
measurements in percentage
POWer:SWLoss:REFLevel:
PERCent:LOWCurrent
This command specifies the low current reference level used in switching loss power
measurements in percentage
POWer:SWLoss:REFLevel:
PERCent:LOWVoltage
This command speci fies the low voltage reference level used in switching loss power
measurements in percentage
POWer:SWLoss:TOFF:ENERGY:
MAX?
Returns the maximum Toff energy switching loss calculation
POWer:SWLoss:TOFF:ENERGY:
MEAN?
Returns the mean To ff energy switching loss calculation
POWer:SWLoss:TOFF:ENERGY:
MIN?
Returns the minimum Toff energy switching loss calculation
POWer:SWLoss:TOFF:POWer:
MAX?
Returns the maximum Toff power switching loss calculation
POWer:SWLoss:TOFF:POWer:
MEAN?
Returns the mean Toff power switching loss calculation
POWer:SWLoss:TOFF:POWer:MIN? Returns the minimum Toff power switching loss calculation
POWer:SWLoss:TON:ENERGY:
MAX?
Returns the maximum Ton energy switching loss calculation
POWer:SWLoss:TON:ENERGY:
MEAN?
Returns the mean Ton energy switching loss c alculation
POWer:SWLoss:TON:ENERGY:
MIN?
Returns the minimum Ton energy switching loss c alculation
POWer:SWLoss:TON:POWer:MAX?
Returns the maximum Ton power switching loss calculation
POWer:SWLoss:TON:POWer:
MEAN?
Returns the mean Ton power switching loss calculation
POWer:SWLoss:TON:POWer:MIN?
Returns the minimum Ton power switching loss calculation
POWer:SWLoss:TOTal:ENERGY:
MAX?
Returns the maximum total energy switching loss calculation
POWer:SWLoss:TOTal:ENERGY:
MEAN?
Returns the mean total energy switching loss calculation
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Command Groups
Table 2-36: Power Commands (cont.)
Command Description
POWer:SWLoss:TOTal:ENERGY:
MIN?
Returns the minimum total energy switching loss calculation
POWer:SWLoss:TOTal:POWer:
MAX?
Returns the maximum total power switching loss calculation
POWer:SWLoss:TOTal:POWer:
MEAN?
Returns the mean total power switching loss c alculation
POWer:SWLoss:TOTal:POWer:MIN?
Returns the minimum total power switching loss calculation
POWer:SWLoss:VCEsat This command specifi es VCESAT value for use in switching loss calculations when the
conduction calculation method is VCESAT
POWer:TYPe This command specifies the power application measurement type
POWer:VOLTA GESOurce This command speci fies the voltage source for the power application
RF Command Group
The Tektronix MDO4000/B Series Oscilloscope models, MDO4000C models with
option SA3 or SA6, and MDO3000 models have a built-in RF input, in addition to
analog and digital channels, which allows you to display, measure, performmath
on and analyze both time and frequency domain signals with one instrument.
The MDO4000/B and MDO4000C models with option SA3 or SA6 combine
the fun
ctionality of a mid-range oscilloscope and a standard spectrum analyzer,
which makes it able to provide several time-correlated display and measurement
options for RF traces.
The MDO3000 allows frequency domain measurements but does not offer
time-correlated display and measurement options for RF traces.
The RF commands are concentrated in the RF Command Group, but also appear
in other command groups, including Save and Recall, Waveform Transfer, Trigger
and Search. A table is available that links the RF features to their corresponding
commands, regardless of command group. (See page 1-2, New or Changed
Functionality Updates that Impact the Programmatic Command Set.)
Frequency Domain Trace
Types
The MDO4000/B/C and MDO3000 support four frequency waveform types:
The frequency domain window provides support for four spectrum traces, which
may be turned on and off independently.
1. RF Normal trace: Each acquisition is discarded as new data is acquired.
2. RF Max Hold trace: The maximum data values are accumulated over multiple
acquisitions of the RF Normal trace.
3. RF Min Hold trace: The minimum data values are accumulated over multiple
acquisitions of the RF Normal trace.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-47
Command Groups
4. RF Average tr
ace: Data from the RF Normal trace is averaged over multiple
acquisitions. This is true power averaging, which occurs before the log
conversion. Each power of 2 average reduces the displayed noise by 3 dB.
Time Domain Trace Types
The MDO4000/B/C offers three additional time domain trace types in addition to
the usual analog and digital waveforms one expects on an oscilloscope. On these
instruments, the time domain window can also display three RF time domain
traces derived from the time-domain I&Q data acquired for the RF input. Theyare
time-correlated with the analog and digital channels, and represent a continuous
time domain data stream. The time domain trace options are:
1. The RF Amplitude vs. Time trace: The instantaneous amplitude of the input,
after band-pass filtering, relative to the current frequency range (as definedbythe
center frequency and span settings.)
2. The RF Frequency vs. Time trace: The instantaneous frequency of the input,
relative to the center frequency. The vertical axis displays frequency. The
frequency versus time waveform handle (baseline indicator) indicates thecenter
frequency. When the trace is above the waveform handle, it is above the center
frequency. When the trace is below the waveform handle, it is below the center
frequency.
3. The RF Phase vs. Time trace: The instantaneous phase of the input, relative to
the center frequency. The vertical axis displays phase, with wrapping at roughly
+/- 180°.
The squelch function is used to suppress the phase and frequency information
when the amplitude of the RF input is below a user-specified value. This keeps
both the RF Frequency vs. Time and the RF Phase vs. Time traces from displaying
broad bands of noise when there is no signal present on the RF input.
Time-Correlated
Multi-Domain Display
(MDO4000/B and MDO4000C with option SA3 or SA6 only.)
A single trigger event coordinates acquisition across all analog, digital, and
RF inputs. This enables a time-correlated view of both the time and frequency
domain signals in a single instrument.
Spectrum Time: This is the period of time used to calculate the spectrum shown
in the frequency domain graticule.
Analog Time: This is the amount of time acquired in the time domain graticule.
RF Acquisition Time: This is the amount of time acquired by the RF system. At
mid-to-fast time base settings, it equals analog time. At slower time base settings,
it can be less than analog time.
Acquisition Stages
RF acquisitions travel through their own signal path before being digitized by the
oscilloscope. This signal path includes a combination of analog amplification,
2-48 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual