10.
Maintenance and Repair
10.1 Preventive Maintenance
Remove batteries and store the ILT1700, along with
detector/filters and optics in the A405 carrying case and a
small amount of desiccant ( silica gel) when not in u se for
an extended time period. The optica l windows should be
cleaned, from time to time, with methyl alcohol or other
window cleaning fluid.
10.2 Battery Caution
ILT recommends the use of rechargeable batteries only as
battery leakage from alkaline b atteries can cause severe
damage to the ILT1700.
10.3 Board Replacement
The ILT1700 has been designed so that each of the four
printed circuit boards can be exchanged without affecting the
calibration accuracy. The first two boards may be removed by
removing the rear panel. First you must remove th e computer
board (middle board), by wiggling from side to side as you
pull to the rear. Once it is slightly free, apply an upward
force as you pull to the rear, in order to clear the power
socket assembly. The amplifier board (top board), should be
removed second, by sliding to the rear while wiggling from
side to side. It is necessary to remove the top cover to
remove the power board (bottom board) and the front panel.
The power board is the third to be removed by taking out
three screws that fix the board to the bottom cover. Once the
hold down screws are out, the power board will slide to the
rear, leaving the front panel with board attached, free to be
lifted straight up. Leave the front panel attached to the
board for protection of the Liquid Crystal Displays (LCD
’
s).
Reassembly is done in reverse order. T he amplifier board
goes in the third slot down from the top, and the computer
board goes in the third slot up from the bottom.
The best way to determine which board is defective is
by substitution. If alternate boards are not available, you
may use the schematics to look for a problem. First start
with the power board. Measure all the output voltages. Next
assemble the power board, front panel board and computer
board. Turn the unit off and momentarily short pins 1 and
11 on the rear panel accessory connector, which will
reinitialize the memory, then turn the unit on again. You
should read 2.55e
-10
on the display after 5 series of
“1’
s
”
blink on the display, then all the lights should function
normally. If the readings are erratic or completely wrong,
the computer board may be at fault. If a single digit or lamp
is not functioning, it probably is associated with the front
panel board. Assuming the results so far are ok, now remove
the computer board, then insert the amplifier board, and
reinsert the computer board in last. If the readings do not
change with the input, you probably have a problem with the
amplifier board or the detector. To tell which one is at fault,
insert a 5.1 megohm 5% resistor into pins 5 and 6 of the
input connector. With the same sensitivity factor set in
9.
General Specifications
9.1
Current Measurement Accuracy
Display - Full scale accuracy of +/- 0.2% from
2 milliamp to 100 nano amp, +/- 0.5% from 100 nanoamp to
1 nanoamp, and +/- 1% below .1 nanoamp.
RS232C - same as for display above.
Recorder - plus or minus 1%, +/-4 millivolts.
9.2 Optical Accuracy
Optical Accuracy is a very difficult entity to address,
because it changes with wavelength. The tolerances we
mention below are exclusive of NIST uncertainty to
absolute, which can vary from less than 1% in the visible to
over 6% in the ultraviolet and over 4% in the infrared.
200-250 - plus or minus 21% of I.L. working
standards (+/- 5% for N.I.S.T. transfer)
250-400 - plus or minus 4.5 % of I.L. working
standards (+/- 1% for N.I.S.T. transfer)
400-960 - plus or minus 3.0% of I.L. working
standards (+/- .31% for N.I.S.T. transfer)
970-1000- plus or minus 4.5% of I.L. working
standards (+/- .58 for N.I.S.T. transfer)
1000-1100 - plus or minus 5% of I.L. working
standards (+/- 2.93. % for N.I.S.T. transfer)
9.3 Radio Frequency Interference
Output Emissions - This equipment generates
and uses radio frequency energy and if not used properly,
that is, in strict accordance with the manufacturer
’
s
instructions, may cause interference to radio and television
reception. It has been type tested and found to comply with
the limits for a class B computing device in accordance with
the specifications in subpart J of part 15 of FCC rules, which
are designed to provide reasonable protection against such
interference in a residential installation. However, there is
no guarantee that interference will not occur in a particular
installation.
Input Signal Interference - Since the normal
measurement range of electrical currents and charges are
extremely small, input errors can occur from large sources
of radio frequency emission. The input is especially
vulnerable to
‘pic
k up
’
if the input cable is not shielded. All
International Light detectors use shielded input cable which
is also necessary for any user provided input device.
9.4 Size and Weight
9.4.1 Size
9 cm High x 22 cm Wide x 24 cm Deep
(3.5" x 8.7" x 9.4")
9.4.2 Weight
2.3 Kg (5.1 pounds)
9.5 Environmental Specifications
9.5.1 Operating temperature range
5 to 40 degrees Celsius
9.5.2 Storage temperature range
-30 to +60 degrees Celsius
9.5.3 Operating and storage relative humidity
0 to 90 %
27
代理美国International Light辐照计http://www.testeb.com/yiqi/ilt/zhaoduji.html 深圳市格信达科技 电话18823303057 QQ：2104028976
