ISA Riber EPP.II Electrometer 0-100uA 220V 315mA Rackmount MBE Vacuum System

ISA Riber EPP.II Electrometer 0-100uA 220V 315mA Rackmount MBE Vacuum System

The ISA Riber EPP.II (also labeled EPP11) is a rackmount electrometer designed for measuring very small ion and beam currents in the picoampere-to-microampere range, with a full-scale deflection of 0-100µA on its front-panel analog meter. It was built by ISA Riber — the French manufacturer of molecular beam epitaxy (MBE) and surface analysis systems — as an integrated measurement accessory for their vacuum deposition platforms. The unit features a gain multiplier selector, a 0-100V bias/polarisation control, and both a signal input and a recorder output on the rear panel, allowing it to feed current readings to an external chart recorder or data acquisition system.

Specifications & What's Included

• Manufacturer: ISA Riber (Rueil, France)
• Model: EPP.II (EPP11)
• Serial Number: I7724 (internal reference)
• Reference Code: 600.045
• Measurement Type: Electrometer (ion/beam current)
• Measurement Range: 0-100 µA (analog meter display)
• Gain: Front-panel x GAIN multiplier selector
• Bias / Polarisation: 0-100V, front-panel rotary knob (BIAS)
• Power: 220V AC, 315mA
• Power Connector: IEC C13 (rear panel, labeled SECTEUR)
• Fuse: 315mA (rear panel)
• Signal Input: BNC connector, J1 (rear panel, labeled ENTREE SIGNAL)
• Recorder Output: BNC connector, J2 (rear panel, labeled SORTIE ENREGISTREUR)
• Internal Battery Set: BLOC PILES compartment accessible from rear (batteries require annual inspection per panel label)
• Front Panel Controls: COURANT/CURRENT selector, TEST PILES/BATTERY CHECK, ON/OFF power switch (SECTEUR)
• Form Factor: Rackmount, housed in aluminum rack frame
• Country of Manufacture: France
• Included: Unit only — no cables or accessories

Applications

The ISA Riber EPP.II electrometer was designed specifically for use with Riber MBE (Molecular Beam Epitaxy) systems — vacuum deposition platforms used in semiconductor research and compound semiconductor thin-film growth. In an MBE environment, an electrometer like the EPP.II measures the extremely low ion currents generated by flux gauges (Bayard-Alpert or nude ion gauges) and beam flux monitors inside the vacuum chamber, allowing operators to quantify and control molecular beam fluxes during epitaxial growth. The analog meter with selectable gain and a built-in bias supply are typical of this class of instrument, which must resolve currents in the nanoampere-to-microampere range under high-vacuum conditions. Riber was one of the leading European MBE system manufacturers from the 1970s through the 1990s, supplying systems to university research labs and semiconductor production facilities worldwide. This type of accessory instrument remains relevant wherever a Riber system is still in service, and the straightforward analog design makes it compatible with a broad range of ion gauge controllers and vacuum instrumentation setups. The recorder output allows logging of flux data to a chart recorder or external DAQ system.