An EPICS module that supports quad electrometers/picoammeters, typically used for photodiode-based x-ray beam position monitors, or split ion chambers. They can also be used for any low-current measurement that requires high speed digital input. There is support for several models:
- The FX4 electrometer from Pyramid Technical Consultants (https://pyramid.tech/products/fx4). This is sold by XDSOxford for the synchrotron market (https://xds-oxford.com/products/detectors-diagnostics/control-modules/fx4-4-channel-precision-electrometer) This device communicates using HTTP (REST API), Websockets, and a built-in EPICS Channnel Access server. It provides 4-channel current measurements at up to 10000 Hz to EPICS. It has additional digital I/O, analog outputs, and built-in servo control capabilities.
- The AH401B, AH401D, AH501, AH501C, and AH501D picoammeters originally designed Synchrotron Trieste (elettra) They are sold commercially by CAENels. These devices communicate using TCP/IP over 100 Mbit/s Ethernet or high-speed serial. They provide 4-channel current measurements at up to 1000 Hz (AH401 series) or 6510 Hz (AH501 series).
- The TetrAMM picoammeter from CAENels. This device communicates using TCP/IP over 1 Gbit/s Ethernet. It provides 4-channel current measurements at up to 20000 Hz.
- The NSLS Quad Electrometer (called NSLS_EM in the documentation). This device consists of a 4-channel digital electrometer unit using a current integrator with Ethernet communication. The device provides 4-channel current measurements at up to 2500 Hz. The Sydor SI-EP-B4 is based on this design and is software comptabible.
- The NSLS2 Quad Electrometer (called NSLS2_EM in the documentation). This device consists of a 4-channel digital electrometer unit using a transconductance amplifier and built-in EPICS IOC running this software. The device provides 4-channel current measurements at up to 10,000 Hz. This model is capable of measuring larger currents than the NSLS Quad Electrometer above.
- The PCR4 picoammeter from SenSiC. This device communicates using TCP/IP over 1 Gbit/s Ethernet. It provides 4-channel current measurements at up to 53,000 Hz.
- The T4U Electrometer from Sydor Technologies. This device provides 4-channel current measurement at up to 10 kHz.
Additional information: