Specifications - Extech Instruments 407790A User Manual

9. Specifications

Applicable Standards: ±1dB high accuracy meets Class 2 standards (IEC 61672-2013 and
ANSI/ASA S1.4/Part 1), IEC 61260-1: 2014 Class 2, ANSI S1.11: 2004 Class 2, ANSI S1.43:
1997 Type 2
Measurement functions: Simultaneous measurement of main channel and sub channel.
Frequency weighting and time weighting are set independently for main and sub channel.

Sound level meter mode: All-pass processing for the measurement items listed below is
carried out separately for the main channel and sub channel

Analyzer mode: For the main channel, octave, octave 1/3 or simultaneous octave, 1/3
octave band real-time processing and all-pass processing are carried out.

For the sub channel, only all-pass processing is carried out.
Processing types in each operation mode
Sound
level meter
mode
Analyzer
mode
Measurement time:
Microphone:
Display:
Update frequency:
Accuracy:
Measurement Frequency range: Octave analysis 31.5 Hz to 8 kHz; 1/3 Octave analysis 25 Hz to 10kHz
Frequency weighting:
Inherent noise: A-weighting max. 17dB; C-weighting max. 25dB; z-weighting max. 30dB
Channel
AP/OCT
Frequency
weighting
Time weighting
Measurement
values
AP/OCT
Frequency
weighting
Time weighting
Measurement
values
1 to 59 seconds, 1 to 59 minutes, 1 to 24 hours
½ inch electret condenser type (Free field)
Backlit color TFT LCD (320×240 dot matrix)
100ms
±1.0dB (ref 94dB @1kHz)
'A', 'C', 'Z'
Main
AP
A/C/Z
F/S/10ms/I
Lp, Leq, SEL, Lmax, Lmin, L
AP, OCT
A/C/Z
F/S/10ms/I
Lp, Leq, SEL, Lmax, Lmin, L
50
Sub
AP
A/C/Z
F/S/10ms/I
Lp, Leq, SEL, Lmax, Lmin, L
N
AP
A/C/Z
F/S/10ms/I
Lp, Leq, SEL, Lmax, Lmin, L
N
407790A-EN_V2.4 1/20
N
N