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TM 11-6625-2958-14&P

tions of output voltage and current on the dc volt-

meter 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.

Potenti-

ometer 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 direct-

ly across the output terminals of the supply. Poten-

tiometer R106 permits calibration of the voltmeter.

4-68 ADDITIONAL 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 in-

ternal damage from reverse voltages that might be

applied across the supply. This could occur, fo

example, during Auto-Series operation if one sup-

ply 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 in-

advertently removed.

4-71 Diode A4CR105, previously mentioned in the

series regulator description, protects the regula-

ting transistor from the effects of reverse voltages.

4-8

HP 6269B Operator’S, Organizational, Direct Support And General Support Maintenance Manua L

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