Model 407730 Version 1.3 June 2004
2
1
2
3
4
5
6
7
8
9
10
11
REC MAX HOLD MIN
AUTO
MANU
SPL
FAST SLOW
A
C
dB
+10
+0
+20
+30
40
1
2
3
4
5
6
7
8
9
10
11
Introduction
Congratulations on your purchase of the Extech 407730 Digital Sound Level Meter. The
407730 measures and displays sound pressure levels in dB from 40 to 130dB. User
selectable features include Frequency Weighting (‘A’ and ‘C’), Response Time (Fast and
Slow), Max Hold, and Max/Min recording. Careful use of this meter will provide years of
reliable service.
Meter Description
1. Microphone
2. LCD
Display
3. ON-OFF
button
4.
A/C weighting selection button
5. Min/Max
Record
button
6.
Range selector button
7.
F/S response selection button
8.
Max Hold selector button
9. Calibration
adjustment
10. AC analog output jack
11. Windscreen
1. Record
icon
2.
Auto or Manual range
3. Range
indicator
4. Bargraph
5.
A or C weighting
6.
Low bat icon
7.
Max level indicator
8. Hold
indicator
9. Min
indicator
10. Fast or Slow weighting
11. dB
display
