Charge Channels
NEXUS Conditioning Amplifier Types 2692-C and 2692-D are designed for applications where very high charge inputs (up to 100 nC) can occur. They contain four charge channels. Each channel has comprehensive high- and low-pass filtering facilities. TNC input connectors are used and TNC to 10 – 32 UNF (microdot) adaptors are provided. Input can be single-ended or floating.
The patented Mounted Resonance Testing facility is available on each channel. It is very useful for obtaining information about the mounting of the associated charge accelerometer and general errors in the measurement setup.
Reliable Design
Since all NEXUS amplifiers are built for both indoor and portable outdoor use, they meet strict requirements for temperature and humidity. The operating temperature range extends from – 10 to +55°C (+14 to +131°F). The instrument will withstand rain if kept with the front panel facing upwards. However, because of the sockets on the back panel, it is not watertight.
Reference and Test Generators
A reference generator is included in the hardware and can be used as an excitation signal for your measurement setup. The output signal is sinusoidal at 159.2 Hz (± 1%) with a level of 1 V RMS. A 159.2 Hz (± 1%) sinusoidal test tone is also available. It is applied in parallel with the charge input signal. The level depends on the selected output sensitivities.
Built-in Filters
A number of filters are provided with NEXUS. The filters are low-pass filters with – 1 dB (– 10%) cut-off frequencies of 0.1, 1, 3, 10, 22.4, 30 and 100 kHz (40 dB/decade, 2-pole) and – 1 dB (– 10%) high-pass filters with 0.1, 1, 10 and 20 Hz cut-off frequencies (10, 20 Hz/80 dB/decade).
Computer Control
Serial RS – 232 Interface
All functions can be controlled via the serial RS – 232 interface. It is possible to switch the power on or off via the RS –232.
Controlling...
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