ST-OSC2B Dual Audio Oscillators

The audio oscillator shall be an RDL ST-OSC2B. The unit shall be equipped with two analog sine-wave oscillators, each producing a different audio frequency.  Each oscillator shall include an automatic gain control circuit, two mono balanced line-level outputs and a multi-turn level trimmer.

One oscillator shall operate at a nominal frequency of 100 Hz and one oscillator shall operate at a nominal frequency of 400 kHz. The unit shall provide audio frequency tones with total harmonic distortion plus noise <3%. 

Each oscillator shall be equipped with an automatic gain control circuit that continuously samples the oscillator amplitude and performs real-time level adjustment to produce stable output amplitude.  A continuous multi-turn trimmer shall be provided for setting the amplitude of the two module outputs that are fed from each oscillator.  The trimmer shall be capable of adjusting the output from off to +10 dBu into 600 O or higher impedance balanced loads.

The unit shall provide two line-level balanced audio outputs with an output impedance no greater than 200 O from each oscillator. The output circuits shall be configured to produce an unbalanced output of proper phase between the positive output leg and ground. The two outputs shall be sufficiently isolated that a short-circuit on one output does not materially reduce the amplitude of the remaining output.

The unit shall be constructed in an electrically non-conductive, thermally conductive enclosure. Internal circuitry shall be protected from moisture and vibration using a thermally conductive compound that permanently secures the circuitry within the enclosure.

The face of the unit shall provide graphical labels identifying wiring connections and operating controls. Controls shall be oriented toward the edge of the unit.

Connection to external wiring shall be provided using a fixed terminal block on the edge of the unit. The terminal block shall accept wiring gauges from 14 to 22 and shall include a positive electrically conductive mechanism to prevent wire abrasion by the terminal screws.

The unit shall measure 3” (7.6 cm) x 1.6” (4 cm) x 0.7” (1.7 cm) and be compatible with all RDL STICK-ON mounting accessories. The unit shall be supplied with a two part re-closable polypropylene fastener system equipped with a rubber adhesive that bonds to low surface energy materials.

The unit shall be equipped to operate from either 24 Vdc ground-referenced power or from bipolar ± 12 Vdc or ± 15 Vdc power with a maximum current not exceeding 80 mA. The unit shall utilize an external power supply and shall be equipped to operate from 24 Vdc ground-referenced or bipolar ± 12 Vdc or ± 15 Vdc power. The unit shall be engineered, assembled and tested in the U.S.A. and be specified for continuous duty in professional installed systems. The unit shall be specified for operation in an ambient temperature between 0 and 55 degrees C. The unit shall comply with relevant EMC requirements and shall bear the CE marking.

The unit shall be an RDL ST-OSC2B.