TM 11-6625-2958-14&P
tions of output voltage and current on the dc voltmeter and ammeter. Both meter movements can withstand an overload of many times the maximum rated output without damage.
4-66 The ammeter together with its series resistors (R101, R105) is connected across current sampling resistor A4R123. As mentioned previously, the voltage drop across the current sampling resistor varies in proportion to the output current. Potentiometer R101 is adjusted for full scale deflection (calibration) of the ammeter.
4-67 The voltmeter, in series with R103 and R104 and shunted by R102 and R106, is connected directly across the output terminals of the supply. Potentiometer R106 permits calibration of the voltmeter.
4-68ADDITIONAL PROTECTION FEATURES
4-69 The supply contains several “special pur- pose” components which protect the supply in the event of unusual circumstances. One of these components is diode A4CR106. Connected across the output terminals of the supply, it prevents internal damage from reverse voltages that might be applied across the supply. This could occur, for example, during Auto-Series operation if one supply was turned on before the other.
4-70 Resistors R108 and R109 limit the output of the supply if the connections between both output buses and the sensing terminals (+S and -S) are inadvertently removed.
4-71 Diode A4CR105, previously mentioned in the series regulator description, protects the regulating transistor from the effects of reverse voltages.