A-A-52316C
2.3 Measurement Depth. The TCMMD shall be capable of depth measurements up to 12 inches in 2 inch increments or less. The index rod or index strip on the gauge allowing the trigger mechanism to be latched or locked at the desired measurement depth. The gauge being designed so that if the operator attempts to pick it up without first returning the source rod to the shielded position, the trigger in the handle releases and the rod retracts to the shielded position. The source rod must be lockable.
2.4 Visual display. The TCMMD shall have a self contained, easily readable and understandable visual display. The visual display shall provide an English readout with automatic conversion to metric units. The visual display shall not become obscured while operating in humid, wet, cold, hot, dusty, or dry environments. The visual display shall incorporate an integrated back light that enables the analyst to read the visual display in reduced visibility, low light, conditions. The visual display shall provide a direct readout of Wet Density (WD) in lbs/ft3, Dry Density (DD) in lbs/ft3, moisture content in lbs/ft3, percent moisture, percent air void, percent proctor, percent marshall, and percent compaction. The TCMMD visual display shall also display the remaining power supply capacity. At a minimum, the visual display shall contain counting circuits, timing circuits, a data display, and related electronic components.
2.5 Data storage and Data transfer. The TCMMD shall have the ability to internally record a minimum of 120 test records and be provided with a Universal Serial Bus (USB) port to allow data to be transferred from the TCMMD onto external data storage devices. Each record shall include the date conducted and provision for entering a task identifier of not less than five characters.
2.6 Power supply. The TCMMD shall be provided with an operator removable, rechargeable, replaceable, extended life battery source capable of performing a minimum of 3000 one minute tests before recharging is needed. The TCMMD shall be provide with a backup power supply that allows the operator to perform an additional 120 measurements in the event the main power supply becomes depleted.
2.6.1 Battery Charger. An automatic charger with quick-disconnect plug-in type connectors shall be provided. The time it takes to fully recharge the battery shall not be greater than sixteen hours. The charger shall operate from 12 volts, dc or 110 volts, ac, 60-hertz power, and shall protect the voltage regulator from damage when the battery is connected improperly. The tester shall incorporate a battery overcharge prevention feature.
2.6.2 Rechargeable Batteries. If rechargeable batteries are used, they shall be of a type that minimizes the promotion of corrosion, when left installed for extended periods.
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