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FR O N T PA N E L O P E R A T I O N
2
C H A P T E R
The FPM-8200 Front Panel
Parameter Setup Control
The PARAMETER SETUP section sets gain range and wavelength response, and
includes the zero function. You can also save and recall setup parameters,
including gain range, wavelength, display mode, filter mode, and user calibration
offset value.
Figure 2.2 Parameter Setup Front Panel Controls
Gain Ranges
Press AUTO/MAN to alternately select auto-ranging or manual gain range setting.
The AUTO indicator is illuminated in auto-ranging mode.
Gain range selection is the default function for the UP and DOWN keys when not
enabled by another function, as described elsewhere in theParameter Setup
Controlsection. If the AUTO indicator is on, pressing UP or DOWN turns the
indicator off and steps one gain range.
For low level measurements, ILX Lightwave recommends stepping down the
range as far as possible for improved resolution.
In Manual Gain Range Mode, eight different ranges may be selected by pressing
the UP and DOWN keys. The front panel displays µW, nW or mW as appropriate.
For more information about gain ranges, see Analog Output (BNC) on page 14.
Gain Range Display
By pressing and holding down the LOCAL/ADR button, the primary GPIB address
is displayed as usual. For example if the primary GPIB address is 1, the front
panel will display "-01-".
While simultaneously holding down the LOCAL/ADR and AUTO/MAN button, the
front panel displays the current gain range setting. For example, if the current
gain range setting is 7, then the front panel will display "--7--". The gain range can
then be changed by continuing to hold down the LOCAL/ADR and the AUTO/MAN
buttons and pressing the UP or DOWN button as appropriate. The instrument
retains the gain range mode (auto or manual) only if the range is not modified. If
the gain range is modified with the UP or DOWN buttons, then the instrument
must be in manual gain range mode.
7
01_10
FPM-8200
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Troubleshooting
