8 Channel Power Measurement
BW
[:SENSe]:CHPower:BANDwidth:VIDeo?
[:SENSe]:CHPower:BANDwidth:VIDeo:AUTO ON|OFF|1|0
[:SENSe]:CHPower:BANDwidth:VIDeo:AUTO?
Example
CHP:BAND:VID 2.4 MHz
CHP:BAND:VID?
CHP:BAND:VID:AUTO OFF
CHP:BAND:VID:AUTO?
Notes
You must be in the Spectrum Analysis mode, W-CDMA mode, cdma2000 mode, DVB-T/H mode,
DTMB (CTTB) mode, ISDB-T mode, CMMB mode, Digital Cable TV mode, LTE mode, LTE TDD mode,
WLAN mode, 1xEVDO mode, MSR,LTE-Advanced FDD/TDD mode or WIMAX OFDMA mode to use
this command. Use :INSTrument:SELect to set the mode.
Dependencies
See Couplings
Couplings
Video bandwidth (VBW) is coupled to the RBW. As the resolution bandwidth changes, the video
bandwidth (if set to Auto) changes to maintain the ratio set by VBW/RBW.
Sweep Time is coupled to the Video Bandwidth (VBW). As the VBW is changed, the sweep time
(when 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 using the average detector with either Sweep Time set to Man, or in zero span, the VBW
setting has no effect and is disabled (grayed out).
When the video bandwidth is AUTO coupled, the video bandwidth value is set to:
Resolution Bandwidth * Video Bandwidth to Resolution Bandwidth Ratio
Preset
SA: Auto
WCDMA: 2.4MHz
C2K: 240 kHz
WIMAX OFDMA: Auto
1xEVDO: 300 kHz
DVB-T/H: 39kHz
DTMB (CTTB): 39kHz
ISDB-T: 300kHz
CMMB: 39kHz
LTE, MSR: Auto
LTETDD: Auto
LTEAFDD,LTEATDD:Auto
Digital Cable TV: 39kHz
WLAN: Auto
ON
372
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 ...