Function Description
Daedalus Lock Manual
Spectrospin AG
41
Quadrature Mixer
5.1.6
The Deuterium frequency is generated in the quadrature mixer from the DDS and
the assisting frequency N x 10 MHz. Quadrature mixing suppresses the image fre-
quency and allows superior filtration.
The N x 10 MHz signal and the DDS signal are split in two 0 - 90 degree power
splitters and mixed in two active mixers (M6 and M7). Their outputs are added to-
gether via the repeating coil TRF4. The 90 degree phase shift of N x 10 MHz is con-
ducted with a lowpass filter (with L18) and a highpass filter (with C131). A broad
band solution with 2 repeating coils (TRF2 and 3) is necessary for the DDS signal.
The image rejection is optimized with a potentiometer POT1 and the trimmable con-
densor C158. The N x 10 MHz frequency can be optimally suppressed by trimming
potentiometer POT4. (Version ECL01: N x 10 MHz is surpressed by trimming the
two condenser C174 and C175)
The mixer product (Deuterium frequency) is given to the LO-Output via the M3 am-
plifier and the following attenuator. In addition the LO-Signal is rectified and, as a
DC voltage, used for diagnostics via the DIAG_3 connection.
Temperature Unit Modulation
5.1.7
According the prnciple described in Patent P4947 stabilizing the temperature of an
NMR probe requires a modulation of the transmitter signal with a low frequency.
The low frequency (F_TEMP) travels over the J1 Pin 3c plug and the coupling con-
densor to the active modulator M8.
The R184 resistor disturbs the Mixer symmetry so that the carrier frequency from
Quadrature Mixer won’t be suppressed. For an optimal low frequency level the car-
rier frequency and sidebands are the same size.
Attenuator and Switching
5.1.8
The two AGC amplifiers (M4 and M5) adjust and switch the transmitter level. Con-
trol proceeds over the UAGC voltage. Transmitter power may be varied by 60dB.
The UAGC voltage will toggle according to whether adjusting (low voltage) or
switching (higher voltage = 12V) is taking place.
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 ...
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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 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 145: ...Daedalus Lock Manual Spectrospin AG 139 Test Equipment Index A ...