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Spectrum Emission Mask Measurement
Meas Setup
Span
Specifies the span used to calculate the power in the reference channel.
Key Path: Meas Setup, Ref Channel
Mode: WCDMA, C2K, WIMAX OFDMA, TD-SCDMA, 1xEVDO, LTE, LTETDD,
WLAN
Remote Command: [:SENSe]:SEMask:FREQuency[1]|2:SPAN <freq>
[:SENSe]:SEMask:FREQuency[1]|2:SPAN?
Example: SEM:FREQ:SPAN 3MHz
SEM:FREQ:SPAN?
Notes: Frequency sub op code, 1 is for BTS, 2 for MS. Default is BTS.
You must be in the mode that includes SEM measurement to use this
command. Use :INSTrument:SELect to set the mode.
Couplings: Range 1 kHz to 50 MHz (although restricted by Integ BW). If you set the
channel Span lower than channel Integ BW, they will both track each other. As
you increase the channel Span, the Integ BW will also increase if it is less than
1/10 of the channel Span.
For WLAN 802.11ac (80 + 80 MHz), the channel span is coupled with the
difference between the center frequencies of the two carriers. When the
difference is either less than 80 MHz or greater than 565 MHz, a “setting
conflict” error message is displayed.
Chan Span = Carrier Spacing + Chan IntegBW;
Preset: WCDMA: 5.0 MHz|5.0 MHz
C2K: 1.25 MHz|1.25 MHz
WIMAX OFDMA: 10 MHz| 10 MHz
TD-SCDMA: 1.6 MHz|1.6 MHz
1xEVDO: 1.25 MHz
LTE: 5 MHz
LTETDD: 5 MHz
WLAN:
if Radio Std is 802.11a/g(OFDM/DSSS-OFDM)/802.11n(20 MHz)/ 802.11ac
(20 MHz): 18 MHz
if Radio Std is 802.11b/g(DSSS/CCK/PBCC): 22 MHz
if Radio Std is 802.11n(40MHz)/ 802.11ac (40 MHz): 38 MHz
if Radio Std is 802.11ac (80 MHz): 78 MHz
if Radio Std is 802.11ac (160 MHz): 158 MHz
if Radio Std is 802.11ac (80 MHz + 80 MHz): 240 MHz
State Saved: Saved in instrument state.