The 'ZERO' button allows the automatic subtraction of any
undesired background light. This convenient function is
necessary for
accurate readings, since ambient and scattered light can contribute
significantly to the overall reading.
The 'SIGNAL'
button selects direct measurement mode, including automatically selected range
and units. This
operating mode is used for measuring the instantaneous
intensity of a light source, with the reading updated every
1/2 second,
autoranging over a seven decade dynamic range.
The
'INTEGRATE' button alternately selects between two 5 decade dynamic range
integration modes, 'HI' and
'LO', also with auto-ranging and auto-units.
Integration is used to measure the 'dose' or sum of all light reaching
the
detector over time. The IL1400A is capable of exposure integrations of up
to 24 hours in duration.
The 'HOLD'
button freezes the display to hold darkroom readings or to terminate / pause an
exposure integration.
This feature makes it much more convenient to take
readings in the dark. Pressing the 'HOLD' button also tells the
computer to
send data to the optional TTL printer.
The 'ON/OFF'
button is complemented by an automatic shut-off feature for prolonged battery
life, which can be
optionally defeated for special long duration
measurements.
The 32
character alphanumeric LCD continuously displays data with full units and the
present mode of operation.
Easy to understand messages such as 'LOW BATTERY'
and 'over range' also appear to indicate error situations,
and to guide the
user through the program mode. |
The menu driven Programming Mode allows experienced users to customize
many of the IL1400A's features. The
auto shut-off can be optionally defeated
in this mode (temporarily or permanently) for long duration measurements.
The
preprogrammed units and calibration factor can also be changed in this mode,
allowing custom recalibration to
a relative standard, or conversion to a
different set of units. The IL1400A stores the new calibration and
units
information in the individual detector's internal memory.
The original
N.I.S.T. traceable calibration information is stored permanently in a view-only
menu screen, that
cannot be altered by the user. The individual detector's
serial number, manufacture date, most recent calibration
date, and range
limitations can also be viewed in the program mode.
|
| ELECTRICAL / MECHANICAL:
Dynamic
Range: 10 pA to 350 uA.
Input Impedance: Virtual ground (summing
node of op-amp).
Linearity: ±0.2%, ±1 digit on low end.
Input
Power: 4 'AA' alkaline batteries, 26 mA, battery eliminator available as an
option.
Battery Life: 36 hours continuous operation.
TTL
Output: 0 to 5 volts.
Recorder Output: 408 Ω impedance, 100 to
1000 mV, ranging every decade, current limited.
Size: 185 mm x 100 mm
x 43 mm (7.3" x 3.9" x 1.7").
Weight: 0.55 kg (1.2
lbs.). |
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