The TetrAMM-CI is a 4-channel current electrometer especially designed for high-precision quadrature BPM applications.
The new CAEN ELS TetrAMM-CI - e.g. "Tetra AMMeter - Charge Integration" - is a 4-channel picoammeter device dedicated to accurate and fast low current measurements.
The presence of a fast Gigabit Ethernet Interface and an SFP (Small Form-factor Pluggable) link allow for very high-throughput data acquisition. Each channel is sampled independently and simultaneously with a minimum continuous integration time of 1ms.
The integrated High Voltage source, with factory-configurable output rating and polarity, can be used to bias the connected detecting system. Standard voltage output is 500V or -500V (but can be customized up to 4 kV).
Integrated High-Voltage Technology by CAEN allows for biasing detectors with low-noise, high-stability and excellent precision.
The High Voltage integrated module is equipped with output voltage and current readbacks, as well as with protection features against over-current, thus protecting the detecting system from excessive power drawing.
On-board processing of data allows to obtain measurements on a user-defined sampling period, with a minimum non-continuous integration time of 50 µs.
Input trigger/gate signals are present on coaxial connectors and are configurable, thus allowing to synchronize the TetrAMM acquisition of the device to an external event.
Small mechanical dimensions are kept as in the previous AH401D and AH501D series in order to install the device as close as possible to the current sensor/detector and to minimize possible environmental noise pick-up. The TetrAMM-CI device is the perfect replacement/upgrade for the AH401D picoammeter.
Charge-integration technique allows maintaining all information on the total charge.
Some applications, as for example pulsed sources - e.g. FEL pulses - require not to lose any information in the conversion of the charge/current data.
A simple I-to-V converter always adds a dissipation element into the signal conditioning chain that leads to a loss of information on the converted data of the total charge.
The charge-integration approach of the TetrAMM-CI (and its predecessor AH401D) allows not losing any information on the charge received or supplied by the device inputs during the integration period.