SIM910 JFET & SIM911 BJT - Voltage Preamplifiers

4 nV/√Hz input noise (SIM910) 1.8 nV/√Hz input noise (SIM911) Selectable gain from 1 to 100 Differential or single-ended input SIM910 & SIM911 Preamplifiers SIM (Small Instrumentation Modules) is a robust, flexible platform in which up to eight high performance instruments share the same compact mainframe and computer interface. Unlike other modular systems, both front-panel and computer operation are possible. With SIM you get the functionality you need while avoiding the cost of unnecessary features. You configure your own system from a broad and growing selection of modules. Programming Examples Slew Rate Limits SIM910 Volatility Statement SIM911 Volatility Statement SIM Modules Scientific Instruments SRS Preamplifiers SIM Modules Sci. Instruments SRS Preamplifiers The SIM910 and SIM911 are low-noise, programmable preamplifiers which are ideal for a wide range of small signal applications. The primary differences between the two models are their input impedance and input noise. The SIM911 has a bipolar junction transistor front-end, offers lower input noise, and has a 100 kΩ front-end impedance . The low bias current and 100 MΩ input impedance of the SIM910, which has a JFET front-end, make it a better choice for use with high impedance sources. Both modules maintain very low output noise resulting in exceptional overall noise performance—even at low gain levels. The bandwidth of these preamplifiers is independent of gain setting so waveforms do not change shape as the gain is varied. Dual parallel outputs (one front and one rear) provide flexibility in cabling. Inputs can be configured as differential (A-B), single-ended (A), or internally grounded, and can be either AC or DC coupled. Additionally, the BNC input shields can be floated, avoiding spurious ground loops when measuring remote signals. The digital control circuitry in the SIM910/911 is designed with a special clock-stopping architecture in which the microcontroller is turned on only when settings are being changed. This guarantees that no digital noise can contaminate low-level analog signals. Settings may be changed from the front panel or through the remote interface. All instrument settings can also be queried via the remote interface. The module generates a status signal to alert the user of an overload condition. Both the SIM910 and SIM911 can be operated outside the SIM mainframe by powering them with their required DC voltages. SIM910/911 Specifications 1 to 100 (1-2-5 sequence) ±0.5 % (DC to 100 kHz), ±5 % (<1 MHz) 4 nV/√Hz @ 1 kHz (SIM910) 1.8 nV/√Hz @ 1 kHz (SIM911) 100 MΩ // 35 pF (SIM910) 100 kΩ // 35 pF (SIM911) Input bias current (DC coupled) 0.5 pA (typ.) (SIM910) 4 µA (typ.) (SIM911) AC coupling freq. (-3dB) 16 mHz (SIM910) 0.7 Hz (SIM911) ±1 V differential, ±5 V common mode Common mode rejection Operating temperature 0 °C to 40 °C (non-condensing) Serial via SIM interface BNC (3 front, 1 rear) DB15 (male) SIM interface Power supplied by the SIM900 Mainframe, or optionally by a user-supplied DC power supply (±15 V and +5 V) 1.5" × 3.6" × 7.0" (WHL) One year parts and labor on defects in materials and workmanship