Laboratory Power amplifier USER GUIDE
Contents
1. 1 User Guide LPA01 User Guide Specification mV typ Input offset voltage Le mV max AC coupling filter 3dB f 16 DO gain factor _ _ 0I Low bandwidth 34B 80k Low bandwidth filter attenuation 40 dB decade linearphase e Keep the ventilation holes on the underneath rear and sides free from Low bandwidth filter type linear phase obstruction x1 x4 x10 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 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 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 instrument do not attempt to open the instrument refer service to the manufacturer or his appointed agent e 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 Full load gain accuracy typic2. aN Newtons4th Ltd LPA01 Laboratory Power amplifier USER GUIDE LPA01 User Guide LPA01 High frequency dc accurate power amplifier for laboratory and industrial applications Description LPAO1 is a high frequency amplifier with 1A pk current output capability at 24V pk pk from dc to greater than 1MHz It uses a composite amplifier arrangement with an integrated power driver to give dc accuracy and excellent high frequency performance with high reliability LPA01 is compensated to drive any capacitive inductive or resistive load internal short circuit protection plus power diodes with high energy transient absorption devices protect the LPAOI against overload or inductive flyback transients The gain is set using 0 1 resistors for accuracy and thermal stability As well as ac and ac dc coupling there is a special coupling mode ac dc where the dc component is not eliminated entirely but is reduced by a factor of about 10 This is particularly useful for testing wound components with a controlled dc bias current where the dc resistance of the component is considerably lower than the ac resistance The high frequency bandwidth can also be reduced with a low pass filter The LPAO1 is mains powered and housed in a robust steel cabinet These specifications are quoted in good faith but Newtons4th Ltd reserves the right to amend any specification at any time without notice A Newtons4th Ltd 30 Loughborough Road Mou
3. ally less than Continuous output current 0 7 Peak Output Current Y 1 Peak operational output voltage 12 LA A o 600 ME 3 Low freq gain accuracy between 12V amp 14V Typ less than Gain Switch setting x1 Gain Switch setting x4 Gain Switch setting x10 e Switch off the amplifier and ensure that the output current has fallen to zero 1 0 8 Low frequency gain accuracy up to 0 before disconnecting an inductive load from the output 0 T T 5 5 16 sl Ok 40 2 12V Typically less than 1 3 5 2 7 1 12 15 2 0 Weight kg Notes All specifications at 230V 50Hz 23 C unless otherwise stated All specifications are typical values unless otherwise stated 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 LPA01 User Guide Total Harmonic Distortion For frequencies up to 1MHz Total Harmonic Distortion is typically less than 0 6 This graph demonstrates the effect of Total Harmonic Distortion on the Maximum Output Voltage of the LPAO1 amplifier at higher frequency levels up to SMHz LPA01 Maximum Output Vrms with lt 0 6 THD 10 00 5 ome WMS a z gt v 0D a O gt 5 2 5 O 100 Frequency KHz LPA01 User Guide Note The amplifier contains an output rms current protection circuit a
4. nd 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 below 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 below OSCILLOSCOPE coupling actde bandwidth wide PH1 voltage NN NJ lk SASS 625 00us div Fig 1 Distorted current waveform OSCILLOSCOPE coupling actde bandwidth wide Fig 2 Correct current waveform
5. ntsorrel Loughborough Newtons4th Ltd LE PAT UK Tel 44 116 2301066 Fax 44 116 2301061 e mail support newtons4th com Website www newtons4th com LPA01 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 LPAO1 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 LPAO1 does not require any calibration Declaration of Conformity We Newtons4th Ltd declare that the product LPAO1 conforms to the requirements of Council Directives 89 336 EEC relating to electromagnetic compatibility EN 55022 Class A 73 23 EEC relating to safety of laboratory equipment EN 61010 1 October 2000 Eur Ing Allan Winsor BSc CEng MIEE Director of Newtons4th Ltd PA0
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