10
Press this key for at least 2 seconds for zeroing. This cancels electronic offset,
detector offset and ambient light on the detector. The 1917-R should be zeroed
before taking measurements. Refer to p.13, adjusting the zero (steps 6 to 8). The
1917-R will redo the zero every time you press the zero button for two seconds,
reboot the 1917-R 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 1917-R is on.
When pressed for at least 2 seconds, Att is activated. Newport’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 Control Key
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 single
needle, tail needle (displays a short tail following the needle movement) and bar
graph (displays a permanent, continuous trail between zero and the current needle
position).
5 -
Range
▲
Up and Down
▼
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
1917-R 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 1917-R has 3 physical gains and it will always auto-scale the physical gain.
The 1917-R will display a little variation during a physical gain change.
