Philips p 817 service manual

Page 2

3 APPLICATIONS Between 50 and 70 %of all electrical faults occurring in a radio receiver or amplifier are such that they can he easily traced by measurements, for which particularly the PHILIPS Universal Measuring Instrument P 817 00/01 is eminently suitable. It is the ideal measuring instrum ent for use in the smaller repair shops or at the customer's home, owing to its small dimensions and to the fact it does not require any mains supply. The following measurements can be carried out with the meter: a. direct and alternating voltages from 0 t o 1200 V; b. direct and alternating currents from 0 to 3 A; c. resistances from 0 to 10 MΩ ELECTRICAL DATA The voltage loss and the current consumption as given in the table at page 4 apply to full deflection; at less deflection these values are proportionally lower. All current and voltage scales are linear . For alternating -current and alternating -voltage measurements the reading remains accurate throughout the frequency range 30 10,000 c/s, with the exception of the measuring range of 1200 V, for which the upper accuracy limit lies at 5,000 c/s. The A.C. an d alternating -voltage ranges have been calibrated for a purely sinusoidal signal. Although the meter can, if necessary, be used standing upright, it measures more accurately lying down (see also page 5, under "zero setting"). PROTECTION For all commonly used measuring ranges the galvanometer can stand overloading fo r a short time. This does not hold,, however, if the knob Sk2 is set to the very sensitive position "60mV"; in this position the protection is cut out and the meter cannot stand overload any longer. The maximum current is 30 µA.