Lock Receiver
56
Spectrospin AG
Daedalus Lock Manual
Low Frequency Section (LF Section)
7.1.3
LF-Amp with variable Gain
This unit, with a gain range of 30 dB, produces a low frequency signal with constant
amplitude. This guarantees maximum input range and the best possible resolution
from the D/A converter which follows.
A SL-6140 AGC from Plessy is once again used for its advantages with noise figure,
phase drift and gain range.
Active Bandpassfilter
To eliminate possible disturbance frequencies and improve the S/N ratio, the low
frequency signal is actively filtered before digitization. A choice is made between
two filters - a bandpass filter with fo = 3.33 kHz with Q = 10 for normal operation or
a lowpass fliter with fo = 0.9 kHz for FFA operation.
The noise content of the normal filter is dominated by voltage noise of the OP’s at a
voltage gain of 40. Therefore we use a LT-1028 from Linear Technology as it is the
lowest noise OP on the market.
The noise requirements when using the FFA filter are less pronounced therefore we
use here a TL-072 from Texas Instruments.
Acquisition
7.1.4
An A/D converter digitizes the absorption and dispersion lock signals alternately
and send these serially via the Optocoupler (galvanic isolation) to the Lock Control-
ler Board for further processing.
A DSP101 from Burr Brown is used as A/D converter. This is a single channel SAR
converter (ENOB=14Bit). The SAR converter has the advantage that it is very exact
around zero. Since we regulate to zero this is exactly the converter we need. The
DSP101 contains in addition an ASIC; this prepares the necessary digital signals in
such a way that we need only three connnections (Clock, Serial Data, Frame Sync.)
on the signal processor. The AT76C120 from ATMEL is second source. In that case
another Logic and a pulse section would be required for the signal processor.
The Multiplexer HI3-0508A5 alternately switches the three low frequency channels
(Dispersions signal, Absorbtions signal, ext. Sensor) to the A/D converter. The sam-
pling rate is 40 kHz. This results in 13.333 kHz per channel which is four times the
IF frequency of the receiver.
The digital signals are sent via the 74HC541 driver, the HCPL 2631 optocoupler and
the 74HC14 Schmitt-Trigger to the signal processor. The clock is 1 MHz. All com-
ponents are placed on the receiver board.
Содержание DAEDALUS
Страница 1: ...BRUKER BRUKER SPECTROSPIN AG SERVICE MANUAL DAEDALUS LOCK Version BSMS 004 ...
Страница 6: ...Contents 6 Spectrospin AG Daedalus Lock Manual ...
Страница 14: ...8 Spectrospin AG Daedalus Lock Manual ...
Страница 16: ...10 Spectrospin AG Daedalus Lock Manual ...
Страница 19: ...Daedalus Lock Catchwords for Bash Daedalus Lock Manual Spectrospin AG 13 Figure 1 Lock Function Diagram ...
Страница 26: ...General Description 20 Spectrospin AG Daedalus Lock Manual ...
Страница 36: ...Operation 30 Spectrospin AG Daedalus Lock Manual ...
Страница 56: ...Lock Transmitter 50 Spectrospin AG Daedalus Lock Manual ...
Страница 64: ...Lock Receiver 58 Spectrospin AG Daedalus Lock Manual ...
Страница 68: ...19F RX Option 62 Spectrospin AG Daedalus Lock Manual ...
Страница 85: ...Installation Daedalus Lock Manual Spectrospin AG 79 Installation 11 2 ...
Страница 86: ...Z0 Compensation Option 80 Spectrospin AG Daedalus Lock Manual ...
Страница 90: ...Technical Data 84 Spectrospin AG Daedalus Lock Manual ...
Страница 92: ...Trouble Shooting 86 Spectrospin AG Daedalus Lock Manual ...
Страница 98: ...BSMS service tool 92 Spectrospin AG Daedalus Lock Manual ...
Страница 107: ...Error Descriptions Daedalus Lock Manual Spectrospin AG 101 ...
Страница 108: ...Lock Error Messages 102 Spectrospin AG Daedalus Lock Manual ...
Страница 114: ...Appendix 108 Spectrospin AG Daedalus Lock Manual ...
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Страница 123: ...Daedalus Lock Manual Spectrospin AG 117 Lock Transmitter Index B ...
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Страница 127: ...Daedalus Lock Manual Spectrospin AG 121 19F Transmitter Option Index A ...
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Страница 129: ...Daedalus Lock Manual Spectrospin AG 123 Lock Receiver Index C ...
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Страница 135: ...Daedalus Lock Manual Spectrospin AG 129 Lock Controller Index A ...
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Страница 137: ...Daedalus Lock Manual Spectrospin AG 131 Lock Controller Index B C ...
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Страница 139: ...Daedalus Lock Manual Spectrospin AG 133 Lock RS232 Biggy Board ...
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Страница 141: ...Daedalus Lock Manual Spectrospin AG 135 Z0 Compensation Option ...
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Страница 143: ...Daedalus Lock Manual Spectrospin AG 137 Cables ...
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Страница 145: ...Daedalus Lock Manual Spectrospin AG 139 Test Equipment Index A ...