HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

OBW
Occupied Bandwidth
OBW Occupied Bandwidth
Performs the occupied bandwidth measurement using the value for occupied bandwidth
percent (OBWPCT). For example, if OBWPCT is set to 99 percent, OBW determines the 99
percent power bandwidth.
Syntax
Equivalent Softkey: OCCUPIED BANDWDTH .
Related Commands: ACPPAR, ACPSNGLM, ACPCONTM, ACPSP, OBWPCT.
Example
OUTPUT 718*"OBW*"
9 >
Description
OBW
OBW measures the power bandwidth of the measured spectrum based on the value of occupied
bandwidth percent (OBWPCT). OBW also measures transmit frequency error (the difference
between the center frequency and the midpoint of the percent occupied bandwidth), and the
total power of the occupied bandwidth. OBW performs the measurement using the value for
channel spacing (ACPSP).
To use OBW:
1. Set the center frequency to the carrier’s frequency.
2. For best accuracy, set the reference level so that the carrier signal peak is within the first
(top) division of the screen graticule.
3. Select the channel spacing with the ACPSP command.
4. If you want the spectrum analyzer settings to be set automatically, ensure that ACPPAR is
set to 1. If you want to set the spectrum analyzer settings manually, set ACPPAR to 0. See
“ACPPAR” for more information about selecting the spectrum analyzer settings manually.
5. If the spectrum analyzer is in the continuous-sweep mode, use the single sweep command
(SNGLS) to select the single-sweep mode.
6. Execute the OBW command.
7. Query OBWBW, OBWLOWER, OBWUPPER, OBWFERR, and OBWPWR variables for the
numeric results of the OBW measurement. See the following table for more information
about these variables.
8. Query trace A (TRA) for the trace results of the OBW measurement.
Measurement Results: The results of the OBW command are stored in the variables and trace
in the following table.
Programming Commands 5-387