Nominal decay times for each time response setting are as follows: 
FAST - 34.7 dB per second 
SLOW - 4.35 dB per second 
IMPULSE - 2.9 dB per second
 
 
PEAK measurements have a rise time constant of 50uS. The displayed 
value is the highest peak occurring prior to a reset. Resets occur every 
second in PAUSE. When the meter is in RUN a manual reset is required.
 
 
 
6.    SPECIFICATIONS
 
 
Standards:    Model 1200 : Type 1 ; Model 2200 : Type 2
 
ANSI Sl.43-1997, ANSI sl.4-1983(R1997), IEC 651-1979, 
IEC 804-1985
 
 
Display:    3 1/2 Digit Liquid Crystal Display. Level display
 
indicates to 0.1 dB resolution. An enunciator is included 
for Battery Check.
 
 
Modes of
 
Operation:   Measures sound pressure level (SPL) maximum level
 
(MAX), minimum level(MIN), and equivalent continuous 
sound pressure level (LEQ) .
 
 
Range:    30 to 140 dBA SPL, 43 to 143 dBA PEAK
 
40 to 140 dBC SPL, 43 to 143 dBC PEAK 
40 to 140 dBZ SPL, 43 to 143 dBZ PEAK
 
 
Pulse Range:  63 dB
 
 
Electrical
 
Noise Floor:  26 dBA typ., 30dBC typ., 35 dBZ typ.
 
 
Frequency 
Weighting 
Networks:    A, C, and Z
 
 
Meter
 
Response:   Fast, Slow, Impulse or Peak (50uS rise time constant).
 
 
Microphone:  Removable .52 inch (13.5mm) prepolarized condenser 
(electret) microphone.
 
Model 1200 - Type 1 accuracy, P/N: 059-523 BK 4936 
Model 2200 - Type 2 accuracy, P/N: 056-317 QE 7052
 
 
AC Output:  Approximately 0-1 Volt AC RMS
 
1 Kohm output impedance, 3.5 mm stereo jack
 
 
DC Output:  Approximately 0-1 Volt DC
 
Each 0.167V change equals l0dB (1V/60dB) 1 Kohm 
output impedance, 3.5 mm stereo jack