Wohler SP 22 Bedienungsanleitung Seite 15

2. Operation
2.2 Measuring Sound Levels
Sound levels are displayed both digitally and in a bar graph. The digital dis-
play is updated every 500ms, while the bar graph is updated every 50 ms.
Press the ON/OFF key to turn the meter on. The unit will first display the full
screen and then count down to zero. The meter will now begin measuring the
current sound levels.
Point the microphone toward the source of the sound to be measured.
2.3 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 frecuency spectrum. Applicati-
ons for A weighting include OSHA regulatory testing, environmental measure-
ment, workplace design, and law enforcement.
C weighting is suitable for flat response measurements with no increase
or decrease of amplitude over the frecuency spectrum. Applications for C
weighting include the sound level anaysis of engines and machinery.
Press the C/A key to toggle between A and C weighting. A small A or C will
be displayed on the right side of the screen to indicate the current mode.
2.4 Selecting the Response Time
You can select fast or slow response time to suit different applications and
standards. For example, most OSHA-related testing is done using slow re-
sponse 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. A small FAST or SLOW will be
displayed on the right side of the screen to indicate the current mode.
2.5 Freezing the Maximum Sound Level Reading
1. Press the ON/OFF key to turn the meter on.
2. When measuring sound levels, press the MAXHLD key to freeze the maxi-
mum reading. MAX HOLD will be displayed. The digital display will remain
unchanged until a higher reading is detected. Note that the bar graph will
continue to record the current reading.
3. Press the MAXHLD key again to exit maximum hold mode.
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Wöhler SP 22
15