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LPA05

1. AC DC This coupling setting will amplify the AC signal at the input of the amplifier by x10 and simply pass x1 gain any DC input Signal Example Input signal 1V AC 10 kHz 500mV DC offset Output Signal from amplifier 10V AC 10 kHz 500mV DC offset AC This coupling setting will amplify the AC signal at the input of the amplifier by x10 and attenuate the DC AC DC AC DC coupling will amplify both the AC and the DC components of the input signal Example Input signal 500mV AC 6 10 kHz 500mV DC offset Output Signal from amplifier 5V AC 10 kHz 5V DC offset Bandwidth There are two options for the bandwidth on the LPAO5 Low 3dB 85 kHz High 3dB 1MHz
2. In the event of a failure of the mains fuse disconnect the mains cord and replace the fuse with the same type and rating as shown on the rear of the amplifier e Switch off the amplifier and ensure the output current has fallen to zero before disconnecting an inductive load from the output e We recommend that after running the amplifier at high power for a period of time disconnect the load letting the fan run for 10 minutes to remove any latent heat build up within the unit LPAO5 User Guide LPAO5A LPAO5B isolated BNC Parameter Input connector Input impedance Peak operational input voltage Maximum safe input voltage Peak withstand input voltage Input common mode range Input offset voltage 1M 40V pk pk a pk pk 250k 80V pk pk Small signal bandwidth 3dB 3M 2V pk pk Coupling Ac ac dc ac d isolated BNC Output connectors soatda ASE Peak output voltage 40 sae Maximum safe output level Maximum ac output current OH 30x 15 x 25 Power source Full power bandwidth m N O 90 265 45 63 Power consumption max Notes All specifications are typical values unless otherwise stated Specifications are valid after 30 minutes warm up lt gt O O E mV we ae m S E E Adc V LPAO5 User Guide Total Harmonic Distortion For frequencies up to 1MHz Total Harmonic Distortion is typically less than 0 6 for the LPAOSA and 0 5 for the LPA03B This graph de
3. Newtons4th Ltd LPAOS Laboratory Power amplifier USER GUIDE Nat Paos LPAO5 User Guide LPAOS High frequency high power dc accurate power amplifier for laboratory and industrial applications Description LPAOS5 is a wideband power amplifier with 40V peak voltage output at 3A rms from dc to 500kHz At lower output levels the gain extends beyond 1MHz It uses an innovative balanced high frequency design to give a slew rate of greater than 120V us while maintaining dc accuracy and high reliability LPAOSB is a higher current lower voltage version capable of delivering SA rms from dc to 1MHz at 16V peak LPAOS5 is generally stable driving any load resistive capacitive see note or inductive but as with all high frequency amplifiers care must be taken when connecting to pure capacitive loads An appropriate resistor or inductor may be needed in series with the Capacitive load to minimise peaking in the frequency response or to prevent spurious oscillation LPAO5 is powered by a universal input power supply monitored by a pair of indicators on the front panel Internally the LPAO5 is floating from ground to minimise earth loops but can be grounded by linking the output OV to earth via the 4mm connectors LPAO5 is housed in a robust steel cabinet Do not obstruct the ventilation holes on the sides underneath or rear of the amplifier Newtons4th Ltd A 30 Loughborough Road Mountsorrel Loughborough
4. Newtons4th Ltd LE12 7AT UK Tel 44 116 2301066 Fax 44 116 2301061 E mail support newtons4th com Website www newtons4th com LPAO5 User Guide Warranty This product is guaranteed to be free from defects in materials and workmanship for a period of 36 months from the date of purchase In the unlikely event of any problem within this guarantee period first contact Newtons4th Ltd or your local representative to give a description of the problem If the problem cannot be resolved directly then you will be given an RMA number and asked to return the unit The unit will be repaired or replaced at the sole discretion of Newtons4th Ltd This guarantee is limited to the cost of the LPAOS5 itself and does not extend to any consequential damage or losses whatsoever including but not limited to any loss of earnings arising from a failure of the product In the event of any problem with the equipment outside of the guarantee period Newtons4th Ltd offers a full repair service contact your local representative The LPAO5 does not require any calibration Note Newtons4th Ltd shall not be liable for any consequential damages losses costs or expenses arising from the use or misuse of this product however caused Declaration of Conformity We Newtons4th Ltd declare that the product LPAO5 conforms to the requirements of Council Directives 89 336 EEC relating to electromagnetic compatibility EN 55022 Class A 73 23 EEC rela
5. monstrates the effect of Total Harmonic Distortion on the Maximum Output Voltage of the LPAOS amplifier at higher frequency levels up to 1MHz LPAOS Maximum Output Vrms with lt 0 6 THD saa for LPAOSA and lt 0 5 for LPAOSB LPAOSA PAOSB cy a ag a 1 gt a 54 FT a 5 LI LOO Frequency KHz Note The amplifier contains an output rms current protection circuit and when driving some capacitive loads this circuit may be activated Due to capacitor construction at high current the amount of energy transfer distorts the current waveform resulting in excessive peak current Fig 1 on next page whilst the rms value remains within specification To ensure correct functionality and prevent false triggering of the protection circuit ideally the current waveform should be a sinewave as pictured in Fig 2 on next page LPAO5 User Guide OSCILLOSCOPE OSCILLOSCOPE C ing coupling oupling ac dc bandwidth wide upling actde bandwidth wide NN Fig 1 Distorted current waveform Fig 2 Correct current waveform Ouick User Guide In the following text we describe the use of the LPA05 including details on the Coupling and bandwidth settings Input The LPAOSA features an input impedance of 10kOhms this should be considered when using function generators designed for 500hm load impedance Nominal Gain The nominal gain of the amplifier is x10 Coupling
6. ting to safety of laboratory equipment EN 61010 1 November 2005 Eur Ing Allan Winsor BSc CEng MIEE Director of Newtons4th Ltd LPAO5 User Guide IMPORTANT SAFETY INSTRUCTIONS This equipment is designed to comply with BSEN 61010 1 Safety requirements for electrical equipment for measurement control and laboratory use observe the following precautions e When continually running the LPAOSA into a lt 5Q impedance load refer to Current v Load De rating graph below However it is allowable to run the unit at full current into lt 5Q for a period not exceeding 30 seconds otherwise overload damage mays occur Max Current Max Current v Output Load Y ua uny N w Load 0 e Ensure that the supply voltage agrees with the rating of the instrument printed on the back panel before connecting the mains cord to the supply e This appliance must be earthed Ensure that the instrument is powered from a properly grounded supply outlet e The input and output connectors and the internal circuitry are isolated from earth do not exceed 40V peak common mode e Keep all the ventilation holes on the underneath rear and sides free from obstruction e Do not operate or store under conditions where condensation may occur or where conducting debris may enter the case e There are no user serviceable parts inside the amplifier do not attempt to open the case refer service to the manufacturer or his appointed agent

LPA05

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