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Appendix A
127
Models SE and DL
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 GΩ; 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 kΩ in series with 11
µF 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.