3M SE, DL user manual User interface, Input/output

129Appendix A

Humidity

10% to 90% RH (non condensing).

User interface

Display

Size - 128 x 64 pixel display that measures 6 cm x 4.8 cm (2.4" x 1.9"). Lighting ~ Transflective to take advantage of ambient lighting plus fiberoptic backlighting that can be manually operated or set to turn off after a timed interval.

Keypad

Construction - Molded layer that holds fourteen press-sensitive buttons. Buttons - Five buttons have dedicated control functions, another five are pri- marily used for selection and navigation, and another four provide variable functions when they are defined in the display (softkeys).

Languages

English, Spanish, German, French, Italian and Portuguese.

Input/output

Memory card ~ Removable Secure Digital (SD) data storage device that is inserted in a slot at the base of the instrument. Stores measurements made in studies and sessions in session files. If the instrument has a logging option installed and is logging measurements, the logged values are stored in the applicable session file as well. The card also stores configuration files.

Microphones

The following specifications apply to microphones connected to the instru- ment.

QE7052 - Free-field, Class/Type 2, (standard), low cost ½-inch diameter (.52"), electret (200 volts must be set to “Off”)

BK4936 - Free-field, Class/Type 1, (standard) ½-inch diameter (.52"), elec- tret (200 volts must be set to “Off”)

QE4110 - Free-field, Class/Type 1 (optional) ¼-inch diameter (.276"), con- denser (200 Volts must be set to “On”). Use for very high dB level free-field measurements. Requires a special preamp to handle high levels. Please contact 3M.

QE4130 - Free field, Class/Type 1 (optional), ½-inch diameter (.52"), con-

Models SE and DL