Model 428 User’s Manual OPERATION
Bristol Instruments, Inc. 18
Average En – Identifies the status of the Average function. Use the Select
button to highlight the Average En value, and use the Change or Arrow
buttons to turn averaging on or off.
Averages – Determines the number of measurements used for averaging
wavelength and power when the Averaging function is enabled. The choices
are 2, 4, 8, 16, 32, 64, or 128 measurements. Use the Select button to
highlight the Average value, and use the Change or Arrow buttons to set the
desired number.
Power Null – Resets the null value used for the power calculation. Use the
Select button to highlight the Power Null value, and use the Change or Arrow
buttons to activate the Power Null. When activated, the instrument will
display the message “Done.”
NOTE: For best results, use this feature when the fiber connector’s
protective cap is attached, ensuring that stray light does not affect the
baseline power measurement.
Power Units – Identifies the units chosen for the display of the power
measurement. The choices are mW or μW (scaled automatically), or dBm.
Use the Select button to highlight the Power Units value, and use the
Change or Arrow buttons to set the desired units.
Power Offset – Determines the Power Offset value when the Power Offset
function is enabled. The Power Offset options are 1-20 dB. Use the Select
button to highlight the Power Offset 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.
Power Offset En – Identifies the status of the Power Offset function. Use the
Select button to highlight the Power Offset En value, and use the Change or
Arrow buttons to turn the Power Offset on or off.
Disp Brightness – Determines the brightness of the display on a scale of 1
to 7, with 7 being the brightest. Use the Select button to highlight the Disp
Brightness value, and use the Change or Arrow buttons to increase or
decrease the brightness setting.
Scroll Control – Selects the method of scrolling through optical channels
while in the List Mode display screen. The options are scrolling one line per
Arrow button press (Smooth) or scrolling one page of 5 lines per Arrow
button press (Page). Use the Select button to highlight the Scroll Control
value, and use the Change or Arrow buttons to set the Scroll Control method.
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