A-A-50734 Multimeter, RuggedizedThis commercial item description CID, describes a Ruggedized Multimeter. This CID is meant as a minimum requirement for the Ruggedized Multimeter in which only those manufacturers that meet or surpass the following requirements are supplied per this CID.

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A-A-50734B

2.6.5.1 Continuity test. The multimeter shall provide a continuous audible tone (or equivalent) for test resistance below 100 ohms. Forward biased (0.15 volts or greater) diode or transistor junctions shall inhibit continuous tone. Any deviation requires Air Force approval.

2.6.5.2 Diode test. The multimeter shall be capable of displaying diode or transistor junction voltage drops to at least 2.000 volts. A momentary audible tone shall indicate a forward biased junction, and the absence of sound shall indicate a reversed biased or open junction.

2.6.5.3 Maximum test current. The maximum diode or continuity test current shall not exceed

1.5 mA.

2.6.5.4 Maximum open terminal voltage. The open terminal diode or continuity test voltage shall not be greater than 3.5 volts.

2.6.5.5 Overload. The multimeter shall be capable of continuously withstanding, without damage or blown fuses, 500 Vrms on all ranges.

2.6.6 DC and AC current.

2.6.6.1 Ranges, resolution, accuracy, and burden voltage. Minimum performance shall be as specified in Table IV.

TABLE IV. DC and AC Current.

RANGE

RESOLUTION

DC ACCURACY

AC ACCURACY

40 Hz TO 1 KHz

MAX BURDEN

(V)

320.0 µA

3200 µA

32.00 mA

320.0 mA

10.00 A

0.1 µA

1 µA

10 µA

100 µA

10 mA

±(0.75%+2 LSD)

±(1.5%+2 LSD)

160 mV

1.6 V

180 mV

1.8 V

0.5 V

2.6.6.2 Overload. The multimeter shall be capable of continuously withstanding; without damage,

0.4 Vrms on all ranges; except the 10 A range shall be capable of withstanding 10 Vrms

continuously and 20 A for 30 seconds. All current inputs shall be fused or protected to interrupt overload currents, up to 10,000 A, from accidental voltage overloads in circuits up to 600 volts.

2.6.7 Controls and visual display.

2.6.7.1 Ranges and function control. All input functions (voltage, current, resistance, and diode/continuity test) shall be controlled with one rotary switch. Ranging shall be automatic (with a manual override) in DC and AC voltage from the 3 V range to the 1,000 V range, and in