unilab NFU 381 Notes For Use Download | Manualshive

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version H28986 2014

Philip Harris Education, 2 Gregory Street, Hyde, Cheshire, SK14 4RH

Orders and Information

Tel: 0845 120 4521
Fax: 0800 138 8881

Repairs

Tel: 0845 120 3211

E-mail:

[email protected]

Website:

www.philipharris.co.uk

© Philip Harris Education, 2002, 2014

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Summary of Contents for NFU 381

Page 1: ...n the instrument Mains input 240V 50Hz Instrument fuse T100mA Mains plug 5A recommended Input characteristics Input range for linear operation 0 to 24V peak d c or a c sine wave 0 to 17V RMS Frequency range d c to 10kHz Input resistance without load 125kΩ Output characteristics Output resistance on lowest range 1kΩ Output resistance on highest range 10mΩ plus wiring resistance No load current with...

Page 2: ...tions Avoid spillage of water and other liquids on to the unit If spillage occurs disconnect the mains supply There is no specific requirement for insulation of external circuits as they cannot become hazardous live as a result of connection to this unit Limit the length of any connecting leads to 3 metres For your safety this product should be used in accordance with these instructions otherwise ...

Page 3: ...the output is determined by the polarity of the input Energy measurement Joulemeter Select display energy The counter increments in proportion to the rate of energy dissipation in the load The repetition rate of the audio bleep corresponds to changes in one of the digits Which digit depends on the range switch setting A separate counter may be connected to the pulse output It must be able to count...

Page 4: ...OT necessarily represent effective values for other waveforms or widely different frequencies Initial procedure Switch on the instrument and allow a short time for transient counts to die away then reset the display Connect the load and the supply For energy measurement it is often convenient to include an on off switch in the supply circuit Select the appropriate load current setting if known oth...

Page 5: ...ading a power dissipation of 40 00mW then f s d on the external meter would represent 100mW and the reading of 4 0 will have to be multiplied by 10 to give 40mW Over voltage warning If the maximum voltage is exceeded the Over voltage LED will light Reduce the voltage immediately and REPEAT the experiment or there will be errors Over current warning If the maximum current allowed in any range is ex...

Page 6: ... 110 C Power supply 12V 5A d c or a c Procedure Record the initial temperature of the aluminium block Heat the block for about five minutes and measure the electrical energy supplied W Record the final temperature allowing for thermal lag i e note the highest temperature reached after the heater is switched off Repeat the procedure for the other blocks which have the same mass supplying the same a...

Page 7: ...ernating current Apparatus Joulemeter wattmeter 10V d c meter instead of 1mA d c meter Resistor 10kΩ Oscilloscope 10V d c meter 10V a c meter Source of smoothed d c 9V 1mA e g PP3 battery or variable smoothed power supply Source of a c and unsmoothed d c full wave rectified 0 to 12V 1mA Procedure Set the oscilloscope input to d c or direct and the time base to 10ms Connect the d c meter switch to ...

Page 8: ... is equal to that dissipated in the source Power in A C Circuits Apparatus Joulemeter wattmeter 10V d c meter instead of 1mA d c meter Audio signal generator capable of 5V r m s output Meters 50mA a c and 5V a c Resistor 470Ω Capacitor 470nF Inductor 2400 turns 150mH Procedure Set the signal generator frequency to 100Hz and adjust the output p d to give a current of about 10mA in the resistive loa...

Page 9: ...d is not recorded 3 Large electrolytic capacitors are prone to significant leakage If this proves troublesome it is usually possible to reform the dielectric by maintaining the capacitor at its full rated working voltage until the leakage current falls to an acceptable value The wattmeter can be used to investigate the dependence on load resistance of a time constant b total energy dissipated Note...

Page 10: ...eter is guaranteed for a period of one year from the date of delivery to the customer This warranty does not apply to defects resulting from the action of a user such as misuse improper wiring any operations outside of its specification improper maintenance or repair or unauthorized modification Our liability is limited to repair or replacement of the product Any failure during the warranty period...

Page 11: ...ducation 2 Gregory Street Hyde Cheshire SK14 4RH Orders and Information Tel 0845 120 4521 Fax 0800 138 8881 Repairs Tel 0845 120 3211 E mail techsupport philipharris co uk Website www philipharris co uk Philip Harris Education 2002 2014 ...

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