). Please read carefully together with the Manual before
operating any item of the Starter Kit equipment. Note that it is possible that some of the errors
are already corrected, if you have version (05.01). This errata document supersedes any older
one that might already be included in the manual.
document information: $Id: errata.trt,v 1.8 2003/05/16 11:24:45 yargo Exp $
1. Terminology
The corrections to be made to the Instruction
Manual refer to its title and page numbering in the
following way: (X.Y.Z Name, P-Q) refers to
paragraph X.Y.Z named "Name" on page P-Q,
e.g. (6.3.4 Procedure, 6-6) designates paragraph
"6.3.2 Procedure" on page 6-6.
2. Errata (I.I document, i-2)
Manufacturer:
Alpes Lasers SA
Pass.Max.Meuron 1
C.P.1766
CH-2001 Neuchâtel
Tel. ++41-32-7299515
Fax. ++41-32-7213619 (3.2 system composition, 3-1)
Add the following text:
"Caution: Do not lift TC-51 or TPG128 only on
the top cover, since this might loosen the
connection between the cover and the chassis.
For operation of the system, the user must
provide a stabilized DC power supply capable
of delivering DC current that corresponds to the
laser peak current multiplied with the specied
duty cycle at the specied LDD voltage; refer
to the datasheet of the laser." (3.3.2 specications, 3-2)
For "-SB mounting" and "-TH mounting", the
unit is mm
3
, not mm
2
. (3.4.4 measurement connections, 3-7)
In the whole section, replace "+" by "B" and
"-" by "L". (3.5.1 description, 3-8)
Currently a release of the LDD100 is shipped
that is newer than the one shown on the images.
Connections are the same, but the average
measuring module (2) and the drive cable (3)
connectors are located at the top of the
LDD100. (3.5.3 QCL pulse switching measuring unit,
3-9..11)
Due to the new release of LDD100 currently
shipped, the whole section is to be replaced
with the one given further down in this
document. (3.6.1 description, 3-12)
Warning:
Although the pulser system is
capable of delivering pulses with lengths up to
200ns and duty cycles up to 50%, the laser may
not withstand this! The laser shall only be
operated under conditions as specied in the
datasheet or by Alpes Lasers directly; all other
operation may result in destruction of the laser
and loss of warranty. (3.6.2 specications, 3-12)
Voltage and Frequency
specications are
220V-240V, 50Hz-60Hz.
Add the following text:
"maximum duty cycle: 50% (if larger duty
cycles are needed, the LDD100 should be fed
by an external 12V power supply, not the one
provided in the TPG128, or else the fuse in the
Starter Kit Manual - Errata
Alpes Lasers SA
Applies to both FP and DFB devices
Applies to both FP and DFB devices - 2 -
TPG128 may blow)" (3.7.2 specications, 3-13)
Temperature monitor is given by "10mV/
°
C",
not "1mV/
°
C". In addition, allow for 15min
warm-up of TC-51 to get stable readings. (4.4 setting the appropriate ac voltage on tc-51,
4-4)
The rst paragraph should be ".. 110/120V or
220/240V if the fuse ..", not ".. unless the fuse
..". (5.3 tc-51 command description, 5-2)
On Fig.24, the text above the center BNC
should be "External Ref. 100mV/K", not "..
10mV/K". (5.4 laser utilisation, 5-3..4)
On Fig.26, the text above the center BNC
should be "External Ref. 100mV/K", not "..
10mV/K".
Step [5] should be "Set the pulse period to 2.0
and the range to 0.5 to 10.5
 
s (medium),
corresponding to a period length of about
2.5
 
s, or to the values specied on the
datasheet or by Alpes Lasers."
Step [6] should be "Set the pulse duration (11)
to 3.0, corresponding to a pulse length of about
50ns, or to the values specied on the datasheet
or by Alpes Lasers."
Step [8] should be "Turn the HV power supply
on, then the TPG ON, and slowly increase the
HV output voltage (but not higher than
specied in the datasheet of the laser!)"
Step [11] should be "Set the desired pulse and
period length as specied in the datasheet or by
special agreement with Alpes Lasers." (6.1 chapter overview, 6-1)
Add the following notice concerning
disassembly of TC-51 and TPG128:
"6.1.1 How to remove the covers of TC-51 and
TPG128
Pull off the light gray plastic pieces at the side
of the front and back plates. Lift off the light
gray plastic shades from the side of the box,
which gives access to the screws holding the
top and bottom covers." (6.2.1.3 procedure, 6-3)
Step [12] is only applicable if desiccation is
needed and the laser has been shipped with a
desiccant bag. (6.2.2.3 procedure, 6-5)
Step [10] is only applicable if desiccation is
needed and the laser has been shipped with a
desiccant bag. (6.4.2.2 material needed, 6-10)
"precision resistor 100 1% or better" instead
of "precision resistor decade Tetex 0 to 100k or
equivalent". (6.4.2.3 procedure, 6-11)
Step [4] should be "Replace the cable
connected to J8 (4) with the 100 1%
reference resistor in the following way:
Connect one side of the resistor to pins 1 and 2,
the other side to pins 3 and 4."
Step [9] should be ".. 5 turns potentiometer (7)
.." instead of ".. (8) ..". (6.4.2.3 procedure, 6-12)
In steps [11] and [12], the reference to Fig.45
for test point B3 is missing. B3 can be found
on Fig.45 vertically above the letter t of the
word "Neuchatel" printed on the PCB.
Step [11] should be "Set the temperature with
the Set Temperature potentiometer (Fig.44(7))
to +5
°
C. The temperature reference signal
B3 should be +4.3V."
Step [12] should be "Set the temperature with
the Set Temperature potentiometer (Fig.44(7))
to -5
°
C. The temperature reference signal
B3 should be -4.3V." (6.4.2.3 procedure, 6-13)
Step [15] should be "Measure the frequency on
the pin 7 of U13(1)." instead of ".. pin 6 ..".
The warning after step [20] should be ".. 5
turns potentiometer (Fig.44(7))." (6.4.2.3 procedure, 6-14)
Step [24] should be "Plug the external cable
into the LLH, and verify that the Pt100 is
properly mounted in the latter." (6.4.2.3 procedure, 6-15)
The Note to step [29] should be "If the current
is too high, stop the test ..", not ".. too
important ..". (6.4.2.3 procedure, 6-16)
On Fig.54, the text above the center BNC
should be "External Ref. 100mV/K", not "..
10mV/K".
In steps [46] and [47], replace "selector (3)" by
"selector (4)". (7.2.1 principle, 7-1)
The second subpoint for the case "Laser draws
current but gives no light" should be "The
polarity is right. It draws too much current and
the power meter is misaligned.", not ".. and is
in disaligned states mode".
Starter Kit Manual - Errata
Alpes Lasers SA
Applies to both FP and DFB devices
Applies to both FP and DFB devices - 3 - (8.2.1 measuring circuit diagram, 8-6)
On the diagram, the following components
should be removed (since they are not present
in the actual unit): C201, C301, C302, C401,
C402, C501, C601, R303, R401, R402, R403.
R401 and R402 should be replaced by short
circuits (straight connections). (a.1.3 specications, a-2)
Input frequency F_in may be given in the range
"0 to 0.1 kHz", not "0 to 1 kHz".
3. Replacement of section 3.5.3
This section replaces section 3.5.3 of the Starter
Kit Manual (pages 3-9, 3-10, 3-11). The new
release of the LDD100 pulser unit has different
specications for the measurement circuits.
3.1 QCL pulse switching measuring unit
3.1.1 Generalities
The measuring circuit
contained in the LDD100 provides information
about various laser pulse parameters (peak
voltages, supply voltages, duty cycle, frequency).
They are only estimated values, since exact
measurement of short and strong pulses with
diodes and averaging circuitry is difcult. Keep
in mind that you should always measure the
voltages on the LLH if you need accurate time
and voltage data (see nal paragraph). However,
these data are useful for monitoring and
surveillance purposes, and to give a rough
estimation of the current parameters.
3.1.2 Measured voltages UHV: 1/2 of the average voltage, respective
to VHT (user supplied high voltage) ULH: 1/2 of the average laser anode
voltage, respective to VHT ULL: duty cycle dependent peak laser
cathode voltage, respective to VHT UD: duty cycle dependent peak transistor
drain voltage, respective to VHT UPI: 1/2 average internally reshaped drive
voltage, respective to ground UPT: 1/2 average of a 37ns xed length
pulse, respective to ground
3.1.3 Timing data
3.1.3.1 Pulse frequency calculation UPT can be
used to calculate the pulse frequency as follows:
f
=
f
0
2UPT v
Plow
v
Phigh v
Plow
where f
0
is a frequency constant, v
Plow
and v
Phigh
are the TTL pulser voltage limits. Actual values:
f
0
=
1
37ns , v
Plow
=0.01V, v
Phigh
=5V .
3.1.3.2 Duty cycle calculation UPI can be used
to calculate the duty factor as follows:
df
=
2<i>UPI v
Plow
v
Phigh v
Plow
with v
Plow
and v
Phigh
as above. To get the real
duty cycle, df must be corrected as follows:
dc
=
f
LDD
df
=
f
LDD
2<i>UPI v
Plow
v
Phigh v
Plow
to compensate for systematic errors in the LDD.
Actual value is f
LDD
=1.1 .
3.1.4 Laser peak current The laser peak current
can be calculated by the measurement of the
current through the series resistor Rs. This is
provided by the values ULL and UD, which are
rectier outputs. To correct for the duty cycle, the
rectier values have to be taken into account with
the following formula for a correction factor
p
=
1
+
Rds
Rc<i>dc
where Rds and Rc are resistors in the rectier
circuit, dc is the duty cycle calculated as in the
preceding paragraph.
Actual values are
Rds=10k and Rc=1