HP8568B__SetCenterFrequency (ul_pbar_instruments)

 *  Synopsis:
 *    #include <ul_pbar_instruments:hp8568b.h>
 *
 *    HP8568B__SetCfSpanRbw( const CHP8568Bptr hp8568BPtr,
 *                           const double cf,
 *                           const double span,
 *                           const double bw )
 *
 *  Function intent:
 *    HP8568B__SetCfSpanRbw() sets the scan center frequency, span and resolution bandwidth.
 *  Function parameters:
 *    double		cf		center frequency in the range:
 *					  100.0 Hz <= cf <= 1500 Mhz for input #1 selected
 *					  100.0 kHz <= cf <= 1500 Mhz for input #1 selected
 *    double		span		frequency span in the range:
 *					  0.0 Hz <= span <= 1500 Mhz
 *    int		bw		bandwidth - one of:
 *					  10 Hz, 30 Hz, 300 Hz, 1 kHz, 3 kHz,
 *					  30 kHz, 100 kHz, 300 kHz,
 *					  1 MHz, 3MHz
 *  Function return value:
 *    CBS_OK		Setup was successful
 *    CLIB_INVARG	Invalid parameter value
 *    CLIB_GENERR	Unable to write HP8568B command(s) 
 *    CLIB_INVALID_DATA	HP8568B status error after GPIB command