Gentec-EO TUNER - Manual (Page 9)

TUNER User’s Manual Revision 4.2 8
Gentec Electro – Optics, Inc. All rights reserved
Press this key for at least 2 seconds for zeroing. This cancels electronic offset, detector
offset and ambient light on the detector. The TUNER should be zeroed before taking
measurements. Refer to p.11, adjusting the zero (steps 8 to 11). The TUNER will redo
the zero every time you press the zero button for two seconds, reboot the TUNER if you
wish to remove the zero cancellation.
3- Needle low-high / Att Control Key
This key enables memorization of the minimum and maximum readings. When enabled,
two blinking needles will continuously mark the current minimum and maximum values
since the memorization function has been enabled. (See point 6 and 7) for digital display
of minimum and maximum values). The minimum and maximum values for both the
needles and the digital high and low can be reset to the current measured value by
pressing this key 2 times quickly (like a mouse double click).
The blinking needles can be toggled on and off by pressing this key again, but once
activated, the minimum and maximum values are continuously updated, as long as the
TUNER is on.
When pressed for at least 2 seconds, Att is activated. Gentec-EO ’s photodetectors are
calibrated with and without attenuator, with both responsitivity data captured in the
detector EEPROM and downloaded into the instrument upon start-up. This key allows
the user to select the proper configuration. The “ATT ON” LCD annunciator message
indicates whether the attenuator setting is activated. Press again for at least 2 seconds to
deactivate ATT,
the message “ATT OFF” will scroll in the LCD to confirm button press
action.
4- Display / Needle style
Toggles the display between measurement, wavelength selection and range selection
modes. (See point 5 below for wavelength and range selection).
When pressed for at least 2 seconds, toggles the needle display between the following
four modes: single needle, tail needle (displays a short tail and a long tail following the
needle movement) and bar graph (displays a permanent, continuous trail between zero
and the current needle position).
5- Range ▲ / Range ▼ Control Keys
Allows the user to select the wavelength in wavelength display mode, or the range in
range display mode and in measurement mode. When selected by the user, the
wavelength and the range are automatically stored in non-volatile memory. The TUNER
returns to this same wavelength and/or range when it is turned on again with the same
detector head.
As the measured power varies upward, the range is automatically adjusted to provide the
most efficient reading There will be no automatic scale down as the power varies
downward.
The TUNER has 3 physical gains and it will always auto-scale the physical gain. The
TUNER will display a little variation during a physical gain change.
Range down can be manually selected using the range down button.
6 - Digital high Control Keys
Displays the maximum recorded values. To return to measurement display mode, press the key again.