Analyzer Module
Each analyzer input has a comparator with a programmable threshold level. Instead of the
programmable threshold, a second input signal can be connected.
Both inputs are connected together via two 50 Ω resistors. The middle net can be connected to
ground via a programmable relay (Figure 6).
With this mechanism, four operation modes are possible:
•
a single-ended signal is compared to a programmable threshold voltage; the input has high
impedance; note that the complement input must not be left open, otherwise the
connected source will see some termination resistance
•
a single-ended signal is compared to a programmable threshold voltage; the input is
terminated to ground
•
a differential signal is connected directly to a comparator; the differential signal is
terminated differentially with 100 Ω
•
a differential signal is connected directly to a comparator; each signal is terminated with
50 Ω
Trigger Module
Each trigger input has a comparator with a programmable threshold level. The input has high
impedance, but can be terminated via a 50 Ω resistor to ground using a programmable relay
(Figure 7).
Note that the functionality of the trigger input on thetrigger module is fundamentally different to the
trigger inputs on the solid-state switch module. While the trigger input on the solid-state switch
module controls only that solid-state switch, the trigger inputs on the trigger module allow to fire
events, which in turn allow to control the sequencer and pattern recorders.
Each trigger output is a simple amplifier with a 50 Ω impedance.
BIT-3000 User Manual
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Figure 6: Analyzer Input Architecture
Figure 7: Trigger Input and Output Architecture
