Bruker HPPR/2 User Manual

HPPR/2 MRI ADM-CRP Module
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The control section incorporates an I2C interface, tuning/matching DAC controller, detune-
and RF switch controller and many diagnostic functions. The TMD section has its own supply,
isolated from the common HPPR (case) GND.
The RF sections contains a preamplifier with a selector for four wobble channels including
TXSW bias current sources. The tuning RF-signal is coupled into the preamplifier via the
tuning switch.
11.2.1 Tuning/Matching Driver
Each TMD channel has four tuning/matching drivers for varicap diodes combined with tune/
detune switches. In tuning/matching mode the output voltage is controlled by DAC. In detune
mode the output voltage polarity is inverted and the current limited.
The tune/detune switches are all switched synchronously with one single detune pulse per
channel. The detune pulses are controlled by a combination of up to four AD-CTRL (formerly
BLNKTR) pulses.
11.2.2 Operating Modes
The ADM-CRP uses internally two modes to set the operating mode. The HPPR/2 COVER
software uses these to control the module functions. They are also available on the service
web page.
• Module mode = channel independent settings.
• Channel mode = channel specific settings, one setting per channel.
Group Operating Mode Array
Coils
Volume
Resonato
r
CRP
TXSW
a
Module
Mode
Channel
Mode
CRP Obs Passive (power up) 0V na RX
b
0 0
Observe Continuous tuned na RX
b
2 0
Observe / Detune
Pulsed
pulsed TX pulsed 2 1
Detune Continuous detuned pulsed TX 2 2
Tune Tuning Reference
c
tuned na TX 1 3
Wobble
d
tuned na TX 3 3
Wobble Detuned detuned na RX 3 4
Wobble 50 W
tuned na TX 3 5
Wobble Observe tuned na RX 3 6
Other Reset Interleave Increment Counter 15
a
Transmit/receive switch in cryo probe, controlled by bias current from ADM-CRP.
b
Caution: No active probe protection against transmitter pulse, only transmit with low power!
c
Internal 50 Ohm reference active.
d
Wobble mode only valid for one channel at a time. Other channels must be set to another
wobble mode.
Table11.1: Module Operating Modes

Bruker HPPR/2 Specifications

General

Brand	Bruker
Model	HPPR/2
Category	Laboratory Equipment
Language	English