MDO3000 Programmer Manual.pdf - 第620页
Commands Listed in A lphabetical Order RF:UNIts This command specifies the vertical units to be used in all RF-related absol ute logarithmic amplitudes. Conditions MDO3000, MDO4000/B, or MDO4000C models with option SA3 or…
Commands Listed in Alphabetical Order
Group
RF
Syntax
RF:STARt <NR3>
RF:STARt?
Arguments
<NR3> is a floating point value that represents the Start frequency.
Examples
RF:STARt 0 specifies to exclude frequencies below 0 Hz from use.
RF:STARt? might return 0.0E+0, indicating that the Start frequency is 0 Hz.
RF:STOP
This command specifies to exclude frequencies above a certain level from use.
NOTE. For the parameters RF:STARt, RF:STOP, RF:FREQuency and RF:SPAN,
when any one of the parameters is changed, the following relationship is enforc
ed:
START = FREQ — SPAN/2
STOP = FREQ + SPAN/2
FREQ = (START + STOP)/2
SPAN = STOP — START
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:STOP <NR3>
RF:STOP?
Arguments
<NR3> is a floating point value.
Examples
RF:STOP 3.0000E+9 specifies to exclude frequencies above 3 GHz from use.
RF:STOP? might return 3.0000E+9, the default.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-589
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