BEST
User’s Manual
Introduction
11
1.1
TetrAMM
overview
The CAENels
TetrAMM
picoammeter is a 4-channel, 24-bit resolution, wide-
bandwidth, wide input dynamic range picoammeter with an integrated optional bias
voltage with bias ratings covering the
±
30V up to
±
4 kV range. It is composed of a
specially designed transimpedance input stage for current sensing combined with
analog signal conditioning and filtering stages making use of state-of-the-art
electronics. This device can perform bipolar current measurements, which makes it
well suited for extremely low input signals. Low temperature drifts, good linearity and
very low noise levels enable users to perform very high-precision current
measurements.
The
TetrAMM
is housed in a light, robust and extremely compact metallic box
that can be placed as close as possible to the current source (BPM detector), in order
to reduce cable lengths and minimize possible noise pick-up on the weak signals
coming from the BPM. It is specially suited for applications where multi-channel
simultaneous acquisitions are required, a typical application being the currents readout
from 4-quadrant photodiodes or diamond-based detectors routinely used to monitor
X-ray beam displacements.
The
TetrAMM
communication to a host PC when used as a standalone unit relies
on a standard 10/100/1000 Mbps Ethernet TCP/IP protocol while its integration with
the
BEST
(Beamline Enhanced Stabilization Technology) system is performed via
the SFP link placed on the rear panel.
The
TetrAMM
unit and its I/O connections can be easily seen in
Figure 2
(front)
and in
Figure 3
(rear).
Figure 2:
front view of a
TetrAMM
unit
Input Channels
High Voltage
output
Measuring range
and status LEDs
High voltage LEDs