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Type 2720

Type 2720
2Pages

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PRODUCT DATAPower Amplifier — Type 2720 USES • Drives Modal Exciter Type 4825 • For any modal or vibration exciter requiring a 500 VA power amplifier FEATURES • 500 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 • Rear panel voltage and current monitor points • Front panel indicator LEDs showing clipped output signal, temperature overload, current overload, output signal phase (0° or 180°), operating mode (current or voltage), current state and interlock input disabled • Multifunction display (backlit LCD) showing approximate output current and output voltage • Powers DC Static Centering Unit Type 1056 (optional) Description Power Amplifier Type 2720 has a usable frequency range from 40 Hz to 15 kHz (full capacity) or DC to 150 kHz (reduced capacity). The rated AC output is 500 VA into a 4 Q exciter or resistive load, in the frequency range DC to 15 kHz (±0.5 dB). The maximum voltage gain is 25 dB. 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. Type 2720 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. The RMS output-current limit is adjustable. The instrument consists of an input stage, a preamplifier, a power amplifier and various warning and safety circuits with indication lamps. A multifunction display shows output current and output voltage. Protection Type 2720 features extensive protection circuits for itself and the connected vibration exciter. When triggered, the protection circuits disconnect the input signal and an LED lights up, indicating the reason for the instrument shutdown. Overload protection against excessive coil current is provided by setting the RMS output current to between 1 and 11 A. This enables Type 2720 to safely drive modal and vibration exciters with different maximum current ratings. The signal to the exciter is switched off if the preset current limit is exceeded, and the red current LED lights up. 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. The temperature protection circuit blocks the amplifier input signal, lighting the red temperature LED. Further protection is provided by an interlock relay that disconnects the input if the operator switches between voltage mode and current mode during operation. Resetting after current, temperature and interlock shutdown is done by simply turning the amplifier gain control fully anticlockwise. Briiel & Kjser

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COMPLIANCE WITH STANDARDS compliance with EMC Directive compliance with EMC Requirements of Australia and New Zealand Safety, EMC Emission and Immunity: According to relevant standards: EN/IEC61010-1, UL61010-1, EN/IEC 61000-6-2, EN/IEC 61000-6-4, CISPR22 Class A limit, FCC Rules Part 15, EN/IEC 61326 Temperature: According to IEC 60068-2-1 and IEC 60068-2-2 Operating temperature: +5 to +40°C (41 to 104° F) Storage temperature: -25 to +70°C (-13 to 158°F) Humidity: According to IEC 60068-2-78, Damp Heat: 90% RH (non-condensing at 40° C (104° F)) Mechanical: Non-operating according to...

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Type 2720 2Pages

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Type 2720
2Pages