Keysight E6640A, Measurement Applications User & Programmer Reference

Page: 748 / 2870

9 ACP Measurement
Meas Setup
Filtered IBW (max dynamic range) — the ACP Path is used to compute ACP when an ACP path is available.
This method increases dynamic range, but increases measurement time as it limits the resolution
bandwidth. This method is useful for improving dynamic range on a W-CDMA signal because a sharp cutoff
bandpass filter is used. The accuracy of the adjacent channel power ratio is not degraded by this method,
but the absolute accuracy of both adjacent channel power and carrier power are degraded by up to about
0.5 dB.
RBW — the algorithm uses zero-span and an appropriate RBW setting to capture all of the power in the
carrier channel and the offsets. The zero-span algorithm (RBW method) is slower than the IBW method,
but greatly improves repeatability.
Fast (in WCDMA mode or SA mode with 3GPP WCDMA radio standard selected) — this provides the same
method as the Integration BW method, but is optimized for speed to measure a W-CDMA signal.
Fast (in CDMA2K mode or SA mode with CDMA2K radio standard selected) – this provides faster
measurement using the FFT method with a limited parameter flexibility. When this is selected, CDMA2K
preset offsets are given and control of the following are grayed out:
BW menu, Sweep/Control menu except Pause/Resume, Trace/Detector menu, Carrier Setup, Offset Limit,
RRC Weighting, Filter Alpha, and Noise Correction softkeys in Meas Setup menu.
Key Path
Meas Setup
Mode SA, WCDMA, C2K, WIMAX OFDMA, 1xEVDO, DVB-T/H, DTMB (CTTB), ISDB-T, CMMB, LTE, LTETDD
Remote Command
[:SENSe]:ACPower:METHod IBW|IBWRange|FAST|RBW
[:SENSe]:ACPower:METHod?
Example ACP:METH IBW
ACP:METH?
Notes
FAST mode is only supported for WCDMA and C2K signal. You must be in the WCDMA or C2K mode
or SA mode with 3GPP WCDMA or CDMA2K radio standard. Otherwise a setting conflict error
message will be reported.
In the TDSCDMA mode, only the IBW method is available to use. Therefore, the measure method key
is not displayed in the TD-SCDMA mode.
CDMA1xEVDO mode only supports RBW and Integration BW method.
C2K mode only supports RBW, Integration BW and FAST method.
LTETDD mode only supports Integration BW and Filtered IBW method.
You must be in the mode that includes ACP measurements to use this command. Use
:INSTrument:SELect to set the mode.
Dependencies When RBW or FAST is selected, Gate function is not available. If you try to turn Gate On while Meas
Method is RBW or FAST, an error is generated.
When Gate function is ON, RBW and FAST method is not available. If you try to change Meas Method
to RBW or FAST, an error is generated.
Couplings IBW (Range) restricts the Res BW available for making this measurement to 30 kHz. When selected,
the Res BW is clipped to this value if required and an error number displayed.
Preset SA, LTE, LTETDD: IBW
WCDMA: IBW
C2K: RBW
748 W-CDMA & HSPA Measurement Applications Reference