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11 Occupied Bandwidth Measurement
BW
set to Auto) is changed to maintain amplitude calibration. This occurs because of common hardware
between the two circuits, even though the Video BW filter is not actually “in-circuit” when the
detector is set to Average. Because the purpose of the average detector and the VBW filter are the
same, either can be used to reduce the variance of the result.
Although the VBW filter is not “in-circuit” when using the average detector, the Video BW key can
have an effect on (Auto) sweep time, and is not disabled. In this case, reducing the VBW setting
increases the sweep time, which increases the averaging time, producing a lower-variance trace.
When the video bandwidth is AUTO coupled, the video bandwidth value is set to:
Resolution Bandwidth * Video Bandwidth to Resolution Bandwidth Ratio
Preset
SA, LTE, LTETDD, WLAN, MSR: Auto
WCDMA: 300 kHz
CDMA2K:120 kHz
WIMAX OFDMA: 1 MHz
TD-SCDMA: 300 kHz
1xEVDO: 300 kHz
ISDB-T: 300 Hz
CMMB: 3 kHz
BLUETOOTH: 30 kHz
ON
ISDB-T, CMMB: OFF
State Saved
Saved in instrument state.
Min
1 Hz
Max
50 MHz
Backwards
Compatibility SCPI
[:SENSe]:OBWidth:BWIDth:VIDeo
Initial S/W Revision
Prior to A.02.00
Modified at S/W Revision
A.03.00
Filter Type
Allows you to select the type of filter to be used for the current measurement. Besides the Gaussian filter
shape, there are certain special filter types, such as Flat Top, that are desirable under certain conditions.
Key Path
BW
Mode
SA, WCDMA, C2K, WIMAX OFDMA, TD-SCDMA, 1xEVDO, ISDB-T, CMMB, LTE, LTETDD,
BLUETOOTH, WLAN, MSR
Remote Command
[:SENSe]:OBWidth:BANDwidth:SHAPe GAUSsian|FLATtop
[:SENSe]:OBWidth:BANDwidth:SHAPe?
Example
OBW:BAND:SHAP GAUS
OBW:BAND:SHAP?
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W-CDMA & HSPA Measurement Applications Reference
Summary of Contents for E6640A
Page 80: ...Table of Contents lxxx W CDMA HSPA Measurement Applications Reference ...
Page 188: ...3 Programming the Test Set Common Commands 188 W CDMA HSPA Measurement Applications Reference ...
Page 256: ...5 Mode Functions Mode Setup 256 W CDMA HSPA Measurement Applications Reference ...
Page 324: ...6 System Functions System 324 W CDMA HSPA Measurement Applications Reference ...
Page 369: ...8 Channel Power Measurement Auto Couple W CDMA HSPA Measurement Applications Reference 369 ...
Page 389: ...8 Channel Power Measurement Marker W CDMA HSPA Measurement Applications Reference 389 ...
Page 664: ...9 ACP Measurement Auto Couple 664 W CDMA HSPA Measurement Applications Reference ...
Page 669: ...9 ACP Measurement BW W CDMA HSPA Measurement Applications Reference 669 ...
Page 984: ...9 ACP Measurement View Display 984 W CDMA HSPA Measurement Applications Reference ...
Page 1001: ...10 Spectrum Emission Mask Measurement W CDMA HSPA Measurement Applications Reference 1001 ...
Page 1668: ...12 Code Domain Measurement Auto Couple 1668 W CDMA HSPA Measurement Applications Reference ...
Page 2354: ...14 QPSK EVM Measurement 2354 W CDMA HSPA Measurement Applications Reference ...
Page 2364: ...14 QPSK EVM Measurement Auto Couple 2364 W CDMA HSPA Measurement Applications Reference ...