1. CONTROLS
1.1 DISPLAY
The ILT1400 uses a two line, thirty-two (32) character
“Supertwist” Liquid Crystal Display (see above) to portray
numerical data, units, mode of operation, and instrument
status alphanumerically in bit-mapped graphics. If the
instrument is turned on without a detector plugged in, the
display will instruct the user to ‘SHUT POWER OFF’,
‘PLUG DETECTOR IN’, in order to properly initialize the
ILT1400 system.
The top line displays sixteen (16) characters,
representing the most recent data and units from the
detector. The detector data is displayed in three or four digit
(depending on digit reliability) decimal form with a + / -
sign. The SI or English optical units are displayed to the
right of this numerical data in standard abbreviated form,
such as mW/cm
2
(milliwatts per square centimeter), with the
prefix scaling by 1000 as the data autoranges, from femto-
(10
-15
) to mega- (10
6
). A typical reading for the top line of
the display, for example, would be +123.4 mW/cm
2
.
The bottom line also displays sixteen (16) characters of
information, representing the mode of operation and the
instrument status. The mode of operation, such as
‘SIGNAL’, ‘HI INTEG’, ‘LO INTEG’, or ‘ZEROING’ is
continuously displayed on the left side of the bottom line.
The characters to the right are reserved for blinking status
messages such as ‘HOLD’, ‘OVR RNG’, ‘NO OFF’ and
‘BAT LO’, with up to two status messages being alternately
displayed. In continuous measurement mode, the bottom
line of the display will typically read ‘SIGNAL’, with the
status display blank unless the hold button was depressed or
an error situation arises.
1.2 BUTTONS
The five buttons on the front surface of the ILT1400
were designed with ease of operation in mind, with the
microprocessor making most decisions for the user.
The ‘ON/OFF’ button turns the instrument on or off. A
detector must be plugged in for the ILT1400 to properly
initialize when first turned on. The instrument will
automatically turn itself off to preserve the battery life if no
buttons are pressed for a period of ten (10) minutes.
The ‘SIGNAL’ button selects the continuous wave
“signal” measurement mode, for continuous monitoring of a
light source. The detector memory establishes the detector
limits and autoranging units to provide an immediate answer
in an easily understood format.
The ‘INTEGRATE’ button selects the integration mode
that was last used, ‘HI INTEG’ or ‘LO INTEG’. Pressing
the ‘INTEGRATE’ button again during integration will reset
the integration register to start over at zero, while remaining
in the same mode. To select the alternate integration mode,
simply press the ‘INTEGRATE’ button twice within one
second and the range will change from ‘HI’ to ‘LO’ or vice
versa.
The ‘ZERO’ button causes the instrument to null the
present reading to zero. Zeroing can be performed in both
the signal and integration modes to subtract ambient light
from future readings. Also, the programming mode can be
accessed by pressing the ‘ZERO’ button within 1 second
after hitting the ‘OFF’ button.
The ‘HOLD’ button temporarily freezes the display to
hold a reading for convenience when measuring in a
darkroom, or in similar situations where it may be
inconvenient to read the LCD display in ‘SIGNAL’ mode.
In integration mode, the ‘HOLD’ button freezes the latest
summation on the display, yet continues to internally
integrate, so that intermediate data can be taken without
disrupting the integration. Pressing the ‘HOLD’ button
again will unfreeze the LCD to once again display the
internal integration without disruption. Pressing the
‘INTEGRATE’ button again while in ‘HOLD’ status
will reset the integration to start over from zero.
The ‘BACKLIGHT’ button (ILT1400BL models only)
turns the backlight for the LCD on or off.
1.3 INPUTS / OUTPUTS
The ILT1400 contains one I/O connector, the detector
card edge connector.
The detector card edge connector performs several
functions besides carrying the signal from the detector to the
ILT1400. TTL Serial data is accessed through this card edge
using a special connector adapter (A512). This connector
also provides a selection of positive and negative bias
voltages for almost all IL detector configurations, and
provides the input for information from the detector memory
concerning calibration and units. See section 4.3 for a
pinout and general description of the card edge connector.
5
+123.4 mW/cm2
SIGNAL
Содержание ILT1400
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