MDO3000 Programmer Manual.pdf - 第619页
Commands Listed in Alphabetical Order Group RF Syntax RF:STARt <NR3> RF:STARt? Arguments <NR3> is a floating point va lue that rep resents the Start fre quency . Examples RF:STARt 0 specifies to exclude frequen…
Commands Listed in Alphabetical Order
Examples
RF:SQUELCH:ST
ATE ON
turns the squelch control on.
RF:SQUELCH:STATE? might return 0, indicating that squelch has been turned off.
RF:SQUELCH:THReshold
This command specifies the squelch threshold level, in volts, for the RF Frequency
vs. Time and RF Phase vs. Time traces.
Conditions
MDO4000/B/C models only.
Group
RF
Syntax
RF:SQUELCH:THReshold <NR3>
RF:SQUELCH:THReshold?
Related Commands
RF:SQUELCH:STATE
Arguments
<NR3> is a floating point number.
Examples
RF:SQUELCH:THReshold 200.0000E-6 sets the squelch threshold level to
200 μV.
RF:SQUELCH:THReshold? might return 22.0000E-6, indicating the squelch
threshold level is 22 μV.
RF:STARt
This command specifies to exclude frequencies below 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 enforced:
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.
2-588 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
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