127Appendix A

External power

External DC power may be provided to the Power jack from the AC or DC sources identified below. Power consumption will range from 1.0-1.5 W at 8-16 VDC.

8 VDC - 125 to 190 mA.

12 VDC - 85 to 125 mA.

16 VDC - 60 to 90 mA.

AC power source ~ Optional switching-type power supply, 3M part num- ber 053-571.

Supply input - 100-240V, 47-63 Hz.

Supply output - 9VDC, 1.1A max.

DC connector - Cable has 2.1mm plug (center pin positive)

AC adapters - Included are different snap-on adapters that allow it to plug into various outlets.

DC power source - 3M offers a cable as an option that plugs into an auto- mobile auxiliary jack, 3M part number 053-870. 9.0 Volts is the nominal power supply voltage to be applied to the DC power jack.

Preamplifier (removable)

Microphone - Accepts 13.2 mm (0.52") microphone directly. Other sizes require an adapter.

Input impedance - Greater than 1 G; less than 2 pF. Signal limit - 11 VAC maximum.

Cable attachment - Capable of driving up to a 15M cable with negligible signal loss.

Meters

Dual meters - Contains two separate meter circuits, each of which can be individually configured with variable parameters.

Input impedance - 20 kin series with 11 F capacitance, with 100 pF capacitance to ground.

Bandwidth

The following bandwidth is typical for the instrument and preamp when set to the 40-140 dB range and F-weighting. Electrical signals are input to the sys- tem with the 059-703 input adapter installed on the preamp.

0.1 dB down - 20 Hz to 14 kHz.

1.0 dB down - 5 Hz to 25.2 kHz.

3.0 dB down - 3 Hz to 25.8 kHz.

Models SE and DL

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3M SE, DL user manual Preamplifier removable, Meters, Bandwidth