MDO3000 Programmer Manual.pdf - 第592页

Commands Listed in A lphabetical Order Related Commands RF:MEASUre:OB W: C H A N B W , RF:MEASUre:OBW:POW er? , RF:MEASUre:OBW :PERCENTdown , RF:MEASUre:OBW :LOWERFreq? Examples RF:MEASUre:OB W:UPPERFreq? might return 2.…

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Commands Listed in Alphabetical Order
Examples
RF:MEASUre:OB
W:PERCENTdown
80 sets the OBW upper and lower frequencies
such that 80% of the total power is contained within these two frequencies, with
20% remaining (10% on either side of these bounding frequencies).
RF:MEASUre:OBW:PERCENTdown? might return 85.0000, indicating that 85% of
the total power has been set to fit within the occupied bandwidth.
RF:MEASUre
:OBW:POWer? (Query Only)
This query returns the total channel power within the occupied bandwidth,
when the RF measurement type has been set to OBW (using the command
RF:MEASU
re:TYPe). The units are user-set (with the command RF:UNIts).
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:MEASUre:OBW:POWer?
Related Commands
RF:MEASUre:OBW:CHANBW, RF:MEASUre:OBW:PERCENTdown,
RF:MEASUre:OBW:LOWERFreq?, RF:MEASUre:OBW:UPPERFreq?
Examples
RF:MEASUre:OBW:POWer? might return –26.1607, indicating that the total
channel power within the occupied bandwidth is 26.1607 user-set units.
RF:MEASUre:OBW:UPPERFr
eq? (Query Only)
This query returns the upper frequency threshold (on the display, the white line to
the right bracketing OBW power). The RF measurement type must be set to OBW
using the command RF:ME
ASUre:TYPe. This frequency will locate the position
where (100% — OBW:PERCENTdown)/2 power is above this frequency.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:MEASUre:OBW:UPPERFreq?
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-561
Commands Listed in Alphabetical Order
Related Commands
RF:MEASUre:OB
W:CHANBW, RF:MEASUre:OBW:POWer?,
RF:MEASUre:OBW:PERCENTdown, RF:MEASUre:OBW:LOWERFreq?
Examples
RF:MEASUre:OBW:UPPERFreq? might return 2.4000E+9, indicating that the
upper frequency threshold is 2.4000E+9 Hz. If
OBW:PERCENTdown is 80%, then
(100%-80%)/2 or 10% of the total power will be above 2.4000E+9 Hz.
RF:MEASUre:TYPe
This command specifies the RF measurement type: Channel Power, Adjacent
Channel Power Ratio, Occupied Bandwidth, or none.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:MEASUre:TYPe {NONe|CP|ACPR|OBW}
RF:MEASUre:TYPe?
Arguments
CP — Channel Power is the total power within the bandwidth defined by the
channel width. When this measurement is active, the span is automatically set
10% wider than the channel width, and the auto detection method is set to Average.
To configure the channel width, use the command RF:MEASUre:CP:CHANBW.
To query the total power within the channel bandwidth, use the command
RF:MEASUre:CP:POWer?
ACPR — The Adjacent Channel Power Ratio returns the power in the main
channel and the ratio of channel power to main power for the upper and lower
halves of each adjacent channel. When this measurement is active, the span is
automatically set 10% larger than required to capture all channels, and theauto
detection method is set to Average. To configure the number of adjacent channels,
use the command RF:MEASUre:ACPR:ADJACENTPAIRs. To configure the
channel width, use the command RF:MEASUre:ACPR:CHANBW. To configure
the channel spacing, use the command RF:MEASUre:ACPR:CHANSPACing
OBW — Occupied Bandwidth (OBW) is the bandwidth that contains the specified
% of power within the Analysis Bandwidth. The OBW is the difference between
the Upper Frequency and the Lower Frequency. When this measurement is active,
the span is automatically set 10% larger than required to capture all channels, and
the auto detection method is set to Average. To specify the Analysis Bandwidth,
use the command RF:MEASUre:OBW:CHANBW. To specify the % of power,
use the command RF:MEASUre:OBW:PERCENTdown.
NONe
2-562 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Examples
RF:MEASUre:TY
Pe ACPR
sets the RF measurement type to ACPR.
RF:MEASUre:TYPe? might return NONE, the default.
RF:POSition
This command specifies the vertical position for the frequency domain traces. The
vertical position is the location of the Reference Level with respect to thetop
of the graticule, in divisions. The lower limit is –10 divisions. The upper limit
is +10 divisions.
Conditions
MDO3000, MDO4000/B, or MDO4000C model
s with option SA3 or SA6 only.
Group
RF
Syntax
RF:POSition <NR3>
RF:POSition?
Related Commands
RF:UNIts
Arguments
<NR3> is a floating point number.
Examples
RF:POSITION –3 moves the frequen
cy domain baseline indicator down3 graticule
divisions from its default position.
RF:POSITION? might return 3.0
000, indicating the baseline indicator has been
set 3 divisions up from its default position.
RF:PRObe:AUTOZero (No Query Form)
This command executes the attached probe’s AutoZero function, for probes that
support this feature. See your probe documentation for more details.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option S
A3 or SA6 only.
Group
RF
Syntax
RF:PRObe:AUTOZero EXECute
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-563