Appendix 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 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.
