126Appendix A

Size - 7.9 cm(W) X 28.2 cm (H) X 4.1 cm (thick); (with preamp and microphone) 3.1"(W) X 11.1"(H) X 1.6" (thick) (with preamp and microphone)

The width is measured across the face of the instrument. The length, which includes the preamplifier but not the microphone, is measured along the longest axis of the instrument.

Weight - 0.54 kg (1.2 lbs), including batteries.

Tripod mount - Threaded insert on the back of the instrument. Accepts a 1/4"-20 screw.

Electrical characteristics

While the instrument is operating from battery or external power it conforms to all applicable tolerance limits of the stated standards. While operating on battery power alone the instrument will automatically shut down when the battery power is depleted. The total battery voltage range is between the maximum overcharge voltage of the NiMH cells 6.6 volts and the low voltage automatic shut down voltage of 4.4 volts.

Power sources

Internal power

Approximately 8 hours of continuous operation at normal mode of operation under reference environmental conditions when full capacity batteries are installed.

Main batteries - Four, replaceable alkaline AA batteries included as original equipment. Rechargeable NiMH batteries available as an option.

Battery life (Constant run without backlighting) - Varies greatly depending on whether alkaline or NiMH batteries are in use and the logging configuration. You can expect the longest battery life when using rechargeable 2700 mAH (or greater) cells. Battery life is slightly shorter in units that contain either filter option.

Battery life (Constant run with backlighting) - Will reduce battery life by approximately 10%.

Auxiliary battery - Internal battery protects against loss of settings when the main batteries are being replaced.

Models SE and DL

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3M DL, SE user manual Electrical characteristics, Power sources