IBSG AMT-07M User manual
Electro Optical Components, Inc.
5464 Skylane Boulevard, Suite D, Santa Rosa, CA 95403
Toll Free: 855-EOC-6300
IBSG Co., Ltd., 26 Polytechnicheskaya str., St-Petersburg, 194021 RUSSIA, ns@iropt6.ioffe.ru, www.ibsg-st-petersburg.com
The universal amplifier
for photodiodes
with built-in cooler
AMT-07M
Operations manual
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Contents
1. Application 3
2. Features 3
3. Service conditions 4
4. Appearance of the amplifier and its interface 5
5. Operating instruction 7
6. Technical characteristics 11
7. Block diagram 12
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1. Application.
The amplifier AMT-07M is designed for signal extraction and detection from
IR-photodiode with built-in cooler manufactured by IBSG.
2. Features.
•The possibility of discrete changing of current amplification to raise the
measurement accuracy.
•The presence of analog output for external device connection and LCD-
display for signal level indication.
•The intrinsic function for background level compensation.
•On board temperature controller provides select and stabilize of the
temperature on the PD's chip in wide range. This gives possibility to
tune and stabilize the photodiode spectral characteristics.
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3. Service conditions.
Temperature tolerance -15 °С..+15 °С
Relative air humidity (at temperature + 35°С) less then 80 %
Atmospheric pressure 86..107 kPa
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4. Appearance of the amplifier and its interface.
Fig.1.Appearance of the amplifier and its interface.
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1. The jack for the PD connection.
2. The display for indication of the PD temperature and signal level.
3. The PD temperature adjuster.
4. The start/stop button of PD cooling.
5. The jack for the cable of AC/DC adapter.
6. The jack for synchronization cable.
7. The jack for external device connection (analog output).
8. The button of display mode selection.
9. The LED indicator of the signal level indication mode.
10. The start/stop button of “ZERO” mode.
11. The button of discrete changing of current amplification.
12. The LED indicator of the PD temperature indication mode.
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5. Operating instruction.
1. Please take a PD with a cooler. Carefully combine its wires with pins of
connector “PD” (1) tightly till fixation (fig.2).
Note! Marked with the red point pin of connector “PD” must be connected with
the appropriate red wire of the PD (fig.2). In the case of wrong junction the PD can
be damaged.
Fig.2. Observance of polarity during the connection
between the PD and the PD connector (1).
2. With the help of the synchronization cable connect the amplifier AMT-07M
(jack “SYNCRO” (6)) with the LED driver (for example with D-31 or DLT-37).
Figure 3.
Fig.3. The polarity of jackplug of cable for synchronization.
Note! Without synchronization the amplifier readings can’t be true.
3. If necessary with the help of a cable connect the “Output” (7) of AMT-07M with
recording instrument (for example oscilloscope or analog-to-binary converter).
Figure 4.
Fig.4. The polarity of jackplug of cable for external device connection.
4. Insert the jackplug of cable of AC/DC adapter into connector "+12V DC" (5).
The AMT-07M is operationally ready. Figure 5.
Fig.5. The polarity of jackplug of power cable.
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5. Using the button “Display mode” (8) select the PD temperature indication
mode. The green LED indicator “Tmeasure” (12) will be turned on. On the LC
display you can see (2) the real temperature of the PD’s chip.
Fig.6. The button of display mode selection and
the LED indicator of the PD temperature indication mode.
6. Set the adjuster “Tadjust” (3) to the extreme right position which corresponds
to the maximum value of PD temperature.
Fig.7. The PD temperature adjuster.
7. Switch on the PD cooling by pushing the button “Cooler ON/OFF” (4). The
green LED indicator “Cooling” will be turned on. After that, slowly rotate the
adjuster “Tadjust” (3) clockwise until the real temperature of the PD’s chip will be
correspond to the requisite value of it.
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Fig.8. The start/stop button of PD cooling with appropriate indicator.
8. Using the button “Display mode” (8) select the PD current indication mode. The
green LED indicator “Signal” (9) will be turned on.
Fig.9. The button of display mode selection.
The LED indicator of the signal level indication mode.
NOTE! The signal level is printed on the display in conventional units.
9. Using the button “Amplif.coef” (11) select the requisite value of current
amplification. The appropriate LED indicator will be turned on (“×1”, “×10” or
“×100”). If the amplification of using PD will be too big you will see on the
display the symbol “1___”. In that case, the coefficient of amplification should be
decreased.
Fig.10. The button and indicators of discrete changing
of current amplification.
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“ZERO” mode description.
The intrinsic function for background level compensation (“ZERO” mode) is
used for amplification and measuring the difference between the current signal
level and the signal taken for the zero level.
Using the start/stop button “ZERO ON/OFF” (10) this mode can be switched.
The appropriate green LED indicator will be turned and the current signal is taken
for the zero level in power up time.
Fig.11. The start/stop button and LED indicator of “ZERO” mode.
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6. Technical characteristics.
Input voltage +12 V, stabilized
Voltage tolerance -5..+5 %
Power consumption Less then 3 W
Adjustment temperature range -15 °С..+15 °С
Board dimensions 148×78×30 mm
Maximal amplification 6,4×106 V/А
Maximal amplitude of output voltage |± 4 V|
Output resistance 50 ohm
Transmission band with PD24 0,5 kHz – 20 kHz
Transmission band with PD25 0,5 kHz – 1 MHz
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6. Block diagram
The block diagramme of AMT-07M is presented in fig.11. The amplifier
functionally consists of the photodetector with PD, temperature sensor RT, Peltier
element P and amplification-transformation circuit including preamplifier А1,
bandpass amplifier ВА, variable gain amplifier A2, synchronous demodulator SD,
multiplexer MX, analog-to-digital converter ADC and liquid crystal display LCD,
as well as regulating-stabilizer circuit of PD temperature including amplifiers А3,
А4 and pulse power supply converter of Peltier element DRVP. The amplifier
feeding is implemented with the DC / DC circuit, which is a pulse voltage
converter from + 12 V in + 5 V, -5 V. The input voltage of DC / DC converter
supplies from +12 VDC jack.
Signal from the output of the photodetector comes to the preamplifier А1. It is
enclosed in a metal shield for noise minimization. From the output of the
preamplifier А1 the signal comes to the bandpass amplifier ВА, which gain the
signal in the band from 500 Hz to 50 kHz, and after that to the variable gain
amplifier А2. The amplification can be changed by the button "Amplif. Coeff".
The value of amplification is indicated by light-emitting diodes “1”, “10” and
“100”.
From the output of the variable gain amplifier А2 the signal comes to the jack
OUTPUT and for rectification to the synchronous demodulator SD, which receive
clock pulses from the jack SYNCHRO.
The multiplexer MX2 switch the direct voltages from:
- the output of the synchronous demodulator SD (The voltage is
proportional to the signal amplitude).
- the potentiometer RP1 (The voltage is proportional to the installed PD
temperature).
- the amplifier A3 (The voltage is proportional to the current PD
temperature).
Voltage from the output of MX2 feed to the analog-digital converter ADC and
then to the liquid-crystal indicator LCD DISPLAY. The display mode can be
selected with the help of button "Display mode".
The circuit executed on DRVP, A3, A4 is used for stabilisation and
adjustment of PD temperature. Stabilisation and temperature adjustment is carried
out by means of Pelte element P. The temperature sensor is based on the
thermoresistor RT. The signal from the temperature sensor after amplification by
A3 supplies on the first input of the error amplifier A4. The reference voltage from
potentiometer RP1 supplies on the second input of A4. The converter DRVP
generates the voltage on the Peltier element which changes the temperature of the
PD and supports its at the level set by the potentiometer "Tadjust". The DRVP begin
working after pressing the button "Cooler ON / OFF". Then cooling is working the
light-emitting diode “Start cooling” is shining. Integrated temperature controller
allows to maintain the temperature of PD in the range from -10 ° C to +25 ° C.
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Fig.12. The Block diagram of AMT-07M.
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