Bruker NMR AV4 BSMS System, Руководство пользователя

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L-TRX/L-19F
H172203_1_001 115 / 234
Name Description Preconditions
Self-test
ADC interface. Tests LVDS interface between
receiver ADC and the signal
processing unit. This test does
not verify the electrical
performance of the ADC. Reference clock
present and power
supplies within
specification.
Power supply. Voltage measurement with
diagnostic ADC. None.
Reference frequency. RF-signal detector, minimal
power level only.
None.
Temperature. Temperature measurement with
sensors and diagnostic ADC. None.
CW-ADC diagnostic. Verification of transmitter and
receiver signal path (internal
loop). Measurement bandwidth is
80 MHz, CW stimulus internally
generated with +10 dBm and -Inf
dBm power level. L-TRX does not
report any error and
the load mismatch at
output J9 2H-TR
OUT is within
specification (see
section
Technical
Data BSMS/2 Lock
Transceiver [
} 99] ).
CW-ADC diagnostic
DDS off.
Pulse diagnostic. Verification of transmitter pulse
shape with own receiver (internal
loop).
CW-decimated
diagnostic. Verification of transmitter and
receiver signal path (internal
loop). Measurement bandwidth is
3.3 kHz (lowpass filter), CW
measurement signal with +10
dBm power level.
Lock mode
diagnostic. Verification of transmitter and
receiver signal path (internal
loop). Measurement bandwidth is
330 Hz (bandpass filter), pulsed
stimulus signal with +20 dBm
and +28 dBm power.
Lock mode
diagnostic, FFA
power.
Ext. pulse power
diagnostic. Measures output power in 2H
amplifier operation. Actual output
power level at J9 2H-TR OUT
depends on input level at J8 2H-
IN. Apply RF pulse
(pulse length 1ms to
100 ms, up to 4
dBm) to J8 2H- IN,
with appropriate
blanking signal at
input J5
BLNKTR-2H~
Ext. RX input power
CW diagnostic. Measures receiver input power
level in CW operation (lowpass
filter, BW=3.3 kHz). Power level
is scaled to dBFS. Terminate J1 2H-
REC IN to measure
receiver noise.
Connect and signal
source with
frequency of f2H to
measure signal
strength.
Ext. RX input power
gated diagnostic. Measures receiver input power
level in pulsed operation with
phase alternating gating (band-
pass filter, BW=330 Hz). Power
level is scaled to dBFS.