AEA Technology, Inc. Bravo MRI II, Руководство по эксплуатации, Страница: 10 / 45

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3.8 F2 Instrument Properties (Adjustments and Settings)
This menu contains items that alter the physical properties of the Bravo MRI II unit.
3.8.1 Backlight Control - Time/Intensity
The backlight provides a convenient way to view the display when operating in dimly lit
locations. The life of the backlight (and the batteries, if used) can be extended by using the
backlight only when needed. You have control of the backlight operation. You may turn the
backlight on (continuous) or off. There are also 3 choices to turn the backlight on for a limited
time before it automatically shuts off. You can also adjust the backlight brightness from this
menu. Use WIDTH to move the cursor to the desired choice for the timer. Use FREQ to
adjust the intensity. When you have finished choosing your settings, press ENTER and you
will be back to measuring.
Note that the backlight turns on when you enter this sub menu. If you want to keep the
light on while measuring, the timer must be set to something other than “off”. When using the
timer (10, 20, or 50) any key presses will reset the timer function. If you have the backlight
set to 10 sweeps, the light goes out after 10 sweeps. If you press a key, the light will come
on again for another 10 sweeps after returning to measuring.
Also note the maximum intensity is limited and the backlight will only be noticed in dim
light conditions. When the Bravo MRI II is in a bright environment, the backlight will be
washed out.
The lowest brightness level is equivalent to the off setting. Either way of shutting off the
backlight will save the same amount of battery power. The brighter the backlight intensity,
the more battery power is used (if running off of the batteries).
3.8.2 Display Contrast
The display contrast can be affected by ambient temperature, so an adjustment is
included. Once in the contrast sub menu, press and hold the WIDTH or FREQ key until the
desired contrast appears. Press ENTER when done.
3.8.3 Audio Options
Pressing a key on the keypad optionally produces an audible beep. You may adjust the
volume level of these beeps. You may also activate an audio readout for when you want to
hear the effects of your adjustments rather than watching the display. In the audio readout
mode, the pitch of the audio varies as the left plot value at the center frequency changes.
Thus if you are measuring total Z on the left plot, the audio pitch gives an indication of the
total Z measured at the center frequency,
Once in the audio sub menu, press WIDTH to set the volume, or press FREQ to toggle
the audio readout mode. Press ENTER to leave the audio sub menu.