2719
2Pages

Catalog excerpts

PRODUCT DATA Power Amplifier — Type 2719 USES • Drives Vibration Exciter Type 4808 • Drives Vibration Exciter Type 4809 safely to full rating FEATURES • 180 VA power output • Adjustable RMS output-current limit • Low or high output impedance • Low distortion over wide frequency range • Extensive built-in protection, including interlock relay • Rear panel voltage and current monitor points • Front panel indicators (LEDs) showing clipped output signal, temperature and current overloads, output signal phase (0° or 180°), operating mode (current or voltage), current state and interlock input disabled • Multifunction display (backlit LCD) showing output current and output voltage Description Power Amplifier Type 2719 is designed to drive small vibration exciters, particularly the 112 N (25 lbf) Vibration Exciter Type 4808. The RMS output-current limit is adjustable, making Type 2719 equally suitable to drive the 45 N (10 lbf) Vibration Exciter Type 4809 safely to full rating. The power amplifier has a usable frequency range from DC to 100 kHz. The rated AC output is 180 VA into a 0.8 Ω exciter or resistive load, in the frequency range DC to 15 kHz (±0.5 dB). The maximum voltage gain is 14 dB. The harmonic content of the output is very small as heavy negative feedback is used. The instrument can tolerate temperature and supply-line variations while maintaining excellent stability. Two output modes are selectable via the front panel. The power output stage is directly coupled to the output, and hence to the connected vibration exciter. A current-limiting circuit prevents excessive instantaneous output current peaks. During operation, the voltage, current levels and waveforms can be inspected at the monitor points on the rear panel or RMS readings can be obtained from the LCD display. Type 2719 consists of an input stage (both AC-coupled and direct), a preamplifier, a power amplifier and various warning and safety circuits with indication lamps. A multifunction display shows output current and output voltage. The amplifier can be used as a voltage generator with low output impedance and a flat voltage frequency response, or as a current generator with high output impedance and a flat current frequency response. Protection Power Amplifier Type 2719 features extensive protection circuits for itself and the connected vibration exciter. When triggered, the protection circuits disconnect the input signal and light an LED, indicating the reason for instrument shutdown. Overload protection against excessive coil current is provided by setting the RMS output current to between 1 A and 15 A. This feature enables Type 2719 to safely drive vibration exciters with different maximum current ratings. The signal to the exciter is switched off if the preset current limit is exceeded. The power output stage is protected by a temperature sensing safety device to prevent output transistor temperatures that exceed design limits and lead to transistor failure. When triggered, the temperature protection circuit blocks the amplifier input signal. Further protection is provided by an interlock relay that disconnects the input if the operator switches between voltage mode and current mode during operation of Type 2719. Resetting is performed by simply turning the amplifier gain control fully anticlockwise. Dedicated LED indicators advise you of the current operating mode and any distortion when excessive signal levels saturate the preamplifier and cause distortion of the output waveform. The instrument remains opera

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Specifications – Power Amplifier Type 2719 OUTPUT VOLTAGE CAPACITY 12 V RMS, DC to 15 kHz, via 4-pin Neutrik® Speakon® plug INPUT IMPEDANCE >10 kΩ DC STABILITY Less than 50 mV drift from 0 V for ±10% variation of mains supply from nominal, and for 10°C to 40°C (50°F to 104°F) variation in ambient temperature CONTROLS Power on/off Continuously variable gain control, 0 to Cal. (14 dB) with integral reset Continuously variable current limit control 1 to 15 A (RMS) Switch for voltage mode or current mode operation Switch for phase inversion (0° or 180°) between input and output MULTIFUNCTION...

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2719 2Pages

Catalog excerpts

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2719
2Pages