MDO3000 Programmer Manual.pdf - 第621页
Commands Listed in Alphabetical Order Syntax RF:WINdow {RECTangular| HAMming|HANning| BLAckmanharris|K AIser|FLATtop} RF:WINdow? Arguments RECTangular — window function equivalent to m ultiplying all gate data by one (so…
Commands Listed in Alphabetical Order
RF:UNIts
This command specifies the vertical units to be used in all RF-related absolute
logarithmic amplitudes.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:UNIts {DBM|DBUW|DBM V|DBUV|DBMA|DBUA}
RF:UNIts?
Arguments
DBM — Decibel milliwatts.
DBUW — Decibel microwatts.
DBMV — Decibel millivolts.
DBUV — Decibel microvolts.
DBMA — Decibel milliamperes.
DBUA — Decibel microamperes.
Examples
RF:UNIts DBUV sets the units to be used in marker and measurement commands
to decibel microvolts.
RF:UNIts? might return DBM, indicating that the current units are in decibel
milliwatts.
RF:WINdow
This command specifies which window will be used for the windowing function,
which is only used for the three time domain RF traces (RF Amplitude vs. Time,
RF Frequency vs. Time and RF Phase vs. Time). The windowing function is a
Fast Fourier Transform (FFT) technique used to minimize the discontinuities
between successive frames of an RF time domain signal. The MDO4000/B/C
Series Oscilloscope includes a set of standard window functions. The default
window is Kaiser.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
2-590 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Syntax
RF:WINdow
{RECTangular|HAMming|HANning|BLAckmanharris|KAIser|FLATtop}
RF:WINdow?
Arguments
RECTangular — window function equivalent to multiplying all gate data by one
(sometimes known as a Dirichlet window).
HAMming — a high or moderate resolution window based on a cosine series.
HANning — a high or moderate resolution window based on a cosine series.
BLAckmanharris — a low-resolution (high dynamic range) window based on a
cosine series.
KAIser — a high or moderate resolution window.
FLATtop — a low-resolution (high dynamic range) window.
Examples
RF
:WINdow BLA
sets the window to BLAckmanharris.
RF:WINDOW? KAISER indicates that the window function is set to the default,
K
aiser.
ROSc:SOUrce
This command specifies the source for the time base reference oscillator. The
reference oscillator locks to this source. Depending on the command argument
that you specify, you can use an external reference or use the internal crystal
oscillator as the time base reference.
This command is also useful for synchronizing multiple instruments.
NOTE. If using an external oscillator, its input frequency variation tolerance
needs to be 10MHz +- 1% (ie. 9.9 MHz to 10.1MHz) and 7Vp-p maximum voltage.
Conditions
Available for 4000 series models only. For MDO3000, this query always returns
UNLOCKED.
Group
Miscellaneous
Syntax
ROSc:SOUrce {INTERnal|E XTernal}
ROSc:SOUrce?
Related Commands
ROSc:STATE?
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-591
Commands Listed in Alphabetical Order
Arguments
INTERnal speci
fies to use the internal 10 MHz crystal oscillator as the time
base reference.
EXTernal specifies to use a user-supplied external signal as the time base
reference.
Examples
ROSC:SOURCE? might return INTERNAL, indicating that the 10 MHz crystal
oscillator is being used as the time base reference.
ROSc:STATE? (Query Only)
This query returns an enumeration value that indicates the lock state of the
reference oscillator specified by the
ROSc:SOUrce command. The values
returned are
LOCKED or UNLOCKED.
Group
Miscellaneous
Syntax
ROSc:STATE?
Related Commands
ROSc:SOUrce
Examples
ROSC:STATE? might return LOCKED, indicating that the time base reference is
locked.
*RST (No Query Form)
Resets the oscilloscope to the factory default settings. The *RST command does
not alter the following:
Calibration data that affect device specifications
The Output Queue
The Service Request Enable Register setting
The Power-on status clear flag setting
Alias definitions
Stored settings
The *PUD? Response
Any of the values associated with the DATA command.
Oscilloscope password
2-592 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual