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Libera Current Meter
Depending on its application, this multichannel data acquisition system is either a current input digitizer or a general-purpose photomultiplier analyzer. The Libera Current Meter is applicable to blade monitors, diamond detectors, wire scanners, and Faraday cups. Capable of high sampling rate, this picoammeter includes 4 input channels and is capable of low current measurements from nA to 2 mA. This low-current ammeter features six measurement ranges that can be calibrated using a known current source. Reconfigurable processing scheme enables measurements of fast current pulses as well as DC current signals. The device can be used with no network connection and store data to the USB storage directly.
Product Description
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Benefits:
- Highest sampling rate compared to other devices
- User-defined data processing available
- Power-over-Ethernet
- Web-browser GUI and other industrial standard interfaces
- Reconfigurable signal processing
- Compact and robust design
- Local access and data storage
Interfaces:
The instrument’s front panel contains interfaces intended for establishing connection to the network, USB storage and USB console. From left to right: microSD memory card slot, micro USB console, RJ-45 for PoE and connection to the network, USB 2.0. There is also a green LED that indicates the instrument is powered ON.
The instrument’s back panel contains interfaces for incoming timing signals and signals from current detectors. From left to right: signal inputs marked as A, B, C and D, trigger inputs marked as T0, T1 and T2, ground connector.
Data processing:
Input currents are immediately converted into voltage via a trans-impedance amplifier, with six different gains depending on the current range selected via software. The signals are then digitized using 18-bit and 2.5 MSps A/D converters. Data is available from a (triggered) buffer, and as a continuous data stream. Each channel can be re-calibrated for offset and gain using a nominal current source.
Libera Current Meter block diagram:
Libera Current Meter Digital signal processing:
Libera Current Meter Capabilities
| Variant | BNC version | TRIAX version |
| General product code | LCMB | LCMT |
| Input channels | 4 | 4 |
| Current ranges | ±60 nA, ±02 A, ±2 A, ±20 A, ±200 μA, ±2 mA | ±60 nA, ±02 A, ±2 A, ±20 A, ±200 μA, ±2 mA |
| Input frequency range | Depends on current range, from 10 kHz to 80 kHz | Depends on current range, from 10kHz to 80 kHz |
| A/D conversion | 2 MHz/18 bit | 2.5 MHz/18 bit |
| Cooling | Passive | Passive |
| Power supply | PoE | PoE |
| Timing signals | LVTTL (3.3 V), ∼10 kΩ termination | LVTTL (3.3 V), ∼10 kΩ termination |
| Calibration | Manual | Manual |
| Fast data link | RJ-45 | RJ-45 |
| High voltage polarization (needs an external high voltage source) | No | Support up to ±150 V |
| High voltage polarization (needs an external high voltage source) | No | Support up to ±150 V |
| Temperature drift, typical | < 1%/ °C | < 1%/ °C |
| 8-hour stability (1°C) (23°C, 1 μA) | 30 nA peak-to-peak | 30 nA peak-to-peak |
| RMS uncertainty @ 1 μA (slow 10 Hz data) | < 50 pA | < 50 pA |
| RMS uncertainty @ 1 μA (slow 10 Hz data) | < 50 pA | < 50 pA |
| Dimensions | H: 1 U, W: 9.5" (rack mountable with a kit), D: 210 mm | H: 1 U, W: 9.5" (rack mountable with a kit), D: 210 mm |
Libera Current Meter Functionalities
| Current readout | Input currents are immediately converted into voltage via a trans-impedance amplifier, with six different gains depending on the current range selected via software. The signals are then digitized, and the data is available from a (triggered) buffer and as a continuous data stream. Each channel can be recalibrated for offset and gain using a nominal current source |
| WebGUI | Easy access is provided by a WebGUI: to connect and acquire data it is sufficient to simply connect to the instrument using a web browser |
| Different data rates | Different data rates available in parallel thanks to the filtering scheme: 2.5 MS/s, 100 kS/s, 1kS/s and 10 S/s |
Libera Current Meter
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Libera Current Meter is used at the following labs:
- CIAE – China Institute of Atomic Energy (CIAE), China
- IJC – Inštitut Jožef Štefan, Slovenia
- Monaco – CEA Cadarache (MONACO), France
- SLS – Paul Schrerrer Institute (PSI), Switzerland
