Introduction
The DSM101 provides automatic or manual ranging. This meter
features 4 measurement ranges from 40 to 130 dB and features
0.1 dB resolution.
The meter allows you to select between fast and slow response times
as well as A and C weighting.
A maximum hold function is provided. Jacks on the meter provide
AC analog output.
Features include
• Automatic or manual ranging
• 0.1 dB resolution
• Selection between slow or fast response times
• A and C weighting
• Maximum hold
• Automatic power off
Button Description
1.
Pwr:
Power on or power off the meter.
2.
RNG:
Auto range/Manual range select key.
3.
A/C:
A weighting and C weighting select key.
4.
F/S:
Response select key.
5.
REC:
Record Maximum and Minimum sound
level measurement.
6.
Max Hold:
Freeze maximum sound level reading.
Measuring Sound Levels
Sound levels are displayed both digitally and in a bar graph. The
digital display is updated every 160ms, while the bar graph is updated
every 40ms.
1. Press the key to turn the meter on. The unit will first display
the full screen and
"188.8"
then count down from 99.9 to zero.
The meter will now begin measuring the current sound levels.
"SPL"
(Sound Pressure Levels) appears on the left side.
"A"
,
"dB"
on the right side of screen. Point the microphone toward the
source of the sound to be measured.
Diagram A
Diagram B
Selecting the Response Time
You can select fast or slow response time to suit different applications
and standards.
EXAMPLE
Most OSHA-related testing is done using slow response time and
A weighting. When you turn the meter on, it will be in fast
response mode. Press the F/S key to toggle between fast and
slow response.
Diagram C
Diagram D
A small icon "
FAST"
or "
SLOW"
will be displayed on the top of the
screen to indicate the current mode.
Selecting A and C Weighting
When you turn the meter on, it will be in A weighting mode. A
weighting enables the meter to respond in the same manner as the
human ear, which increases and decreases amplitude over the
frequency spectrum. Applications for A weighting include OSHA
regulatory testing, environmental, workplace safety design, and
law enforcement.
Diagram E
2
4
6
1
3
5
DSM101-MAN
P. 1
