Bristol 428 - Configuration Screen 2

Model 428 User’s Manual OPERATION
Bristol Instruments, Inc. 19
Configuration Screen 2
Displays and allows changes to parameters specifying the conditions for valid
channel recognition.
W a v e L i m i t s : On
s t a r t : 1 2 6 7
e n d : 1 6 0 0
E x c u r s i o n : 1 0 d B
P e a k T h r e s h : 1 0 d B
T h r e s h T y p e : R e l
Def Ref#:
1
Config: 2
Config
M o d e


C h a n g e
S e l e c t
Figure 3.12: Configuration Screen 2
 WaveLimits – This parameter limits the wavelength range from which the
instrument will find and display channels. When the WaveLimits are on, the
instrument will display only the channels found between the Start and End
wavelengths. When off, the instrument will display all channels that it finds.
 Start – Identifies the lower end of the wavelength range (nm only) of the
WaveLimits parameter. Use the Select button to highlight the Start value’s
left most digit, use the Change or Arrow buttons to set the desired number,
and use the Select button to highlight the next digit to the right. Repeat until
all four digits are set.
 End – Identifies the upper end of the wavelength range (nm only) of the
WaveLimits parameter. Use the Select button to highlight the End value’s left
most digit, use the Change or Arrow buttons to set the desired number, and
use the Select button to highlight the next digit to the right. Repeat until all
four digits are set.
 Excursion – One of two user-specified criteria for a spectral feature to be
recognized as a valid channel by the instrument. Excursion defines the
minimum distance between the peak and the measurement noise floor on
either side of the peak. This parameter’s options are 1-30 dB, with a default
value of 10 dB. If a different Excursion value is desired, use the Select button
to highlight the Excursion value’s left most digit, use the Change or Arrow
buttons to set the desired number, and use the Select button to highlight the
next digit to the right. Repeat to set the second digit.
 PeakThresh – One of two user-specified criteria for a spectral feature to be
recognized as a valid channel by the instrument. PeakThresh defines the
minimum height that a spectral feature must reach to be designated as a
channel. This parameter’s values are 0-40, in units of dB or dBm, with a
default value of 10 dB. If a different threshold value is desired, use the Select
button to highlight the PeakThresh value’s left most digit, use the Change or
Arrow buttons to set the desired number, and use the Select button to
highlight the next digit to the right. Repeat to set the second digit.
 ThreshType – Determines whether the peak threshold is relative to the most
intense peak in the optical signal (Rel) or an absolute value from the noise
floor (Abs). Use the Select button to highlight the ThreshType value, and use
the Change or Arrow buttons to set the ThreshType method.