az-instrument 8921 Installationshandbuch
Digital Sound Level Meter
Model: 8921
8922
INTRODUCTION
Your digital sound level meter provides
automatic or manual ranging in six
meas-urement ranges from 30 to 130dB.
The unit meets ANSI S1.4 and IEC 651
Type 2 standards, and features 0.1dB
resolution.
A background noise absorber permits
you to measure sound levels accurately
even in the presence of high background
noise.
The meter allows you to select between
fast and slow response times and A and
C weighting. A maximum hold function
is provided.
Jacks on the meter provide both AC and
DC analog output, while an RS-232
interface allows you to use an optional
cable to capture sound level data on a
PC.
1. Selecting A & C weighting.
2. Selecting the response time.
3. Freezing the maximum sound
level reading.
4. Recording the maximum and
minimum measurements.
5. Using the backgound noise
absorber.
6. Selecting Automatic and manual
ranging.
7. Automatic shut off.
8. Easy to replace battery.
FUNCTIONS:
FRONT PANEL DESCRIPTION
1 MICROPHONE
2 LCD DISPLAY
3 ON/OFF
4 REC
5 MAXHLD
6 C/A
7 BA MODE
8 F/S
9 DOWN
10 UPPER
11 DC 9V
12 CAL
13 AC OUT
14 DC OUT
15 RS232
16 BACKLIT
- Power button
- Records sound level
readings
- Freezes the maximum
sound leveldigital
reading
- A/C frequency
weighting selector
- Background noise
absorber
- Fast/Slow response
selector
- Adjusts the
measurement range
- Adjusts the
measurement range
- DC adapter jack
- Calibration screw
- AC analog output jack
- DC analog output jack
- RS-232 output jack
- Back light
(Model 8922 only)
The meter will display all segments
when it is first turned on. Though you
might seen SEL, Leq, DOSE, PEAK....
These are not available for the meter
you purchased, please contact the
store or the place you purchased for
further models with these additional
functions.
FRONT PANEL DIAGRAM
16
0
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.
Press the ON/OFF key to turn the
meter on. The unit will first display
the full screen and then count down
to zero.(See Fig. 1)
The meter will now begin measuring
the current sound levels.(See Fig.2)
Point the microphone toward the source
of the sound to be measured.
Fig.1
+10
+20
+30
+40
+50
90
90dB
50dB
Fig.2
+10
+20
+30
+40
+50
50
SPL
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, environ-
mental measurement, workplace
design, and law enforcement.
C weighting is suitable for flat response
measurements with no increase or
decrease of amplitude over the
frequency spectrum. Applications for
C weighting include the sound level
analysis 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.
Fig.3
40
SPL
+10
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 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. A small SLOW will be
displayed on the right side of the screen to
indicate the current mode.(See Fig.4)
FREEZING THE MAXIMUM SOUND
LEVEL READING
1Press the ON/OFF key to turn the
meter on.
2When measuring sound levels, press
the MAXHLD key to freeze the
maximum reading. MAX HOLD will be
displayed. (See Fig.5) The digital
display will remain unchanged until a
higher reading is detected. Note that
the bar graph will continue to record
the current reading.
3Press the MAXHLD key again to exit
maximum hold mode.
Fig.4
40
SPL
+10
RECORDING THE MAXIMUM AND
MINIMUM MEASUREMENTS
1Press the ON/OFF key to turn the
meter on.
2Press the REC key.REC will be
displayed on the bottom of the
screen(See Fig.6) . The meter will
begin tracking the maximum and
minimum sound level
measurements.
Fig.6
40
SPL
+10
3Press the REC key again. MIN will
appear on the bottom of the screen
(See Fig.7) and the mini. sound level
measurement will be displayed. The
unit isn't recording at this time, but the
bar graph will continue to show the
current reading.
Fig.7
40
SPL
+10
Fig.5
60
FAST
A
4Press the REC key again. MAX will
appear on the bottom of the screen
and the maximum sound level
measurement will be displayed.
The unit is not recording at this
time,but the bar graph will continue
to show the current reading.
5Press the REC key again to resume
recording and repeat the process.
6Press and hold the REC key until
the REC indicator disappears to
exit recording mode.
Fig.8
40
SPL
+10
USING THE BACKGROUND NOISE
ABSORBER
This feature allows you to measure
equipment noise accurately, even in
the presence of high background
noise.
1Press the ON/OFF key to turn the
meter on.
2Press the MAXHLD key.MAX HOLD
will be displayed.(See Fig.5)
3Press the BA MODE key.Fwill be
displayed to the left of the SPL
(sound pressure level) icon. The
digital display will show the
background noise level.MAX HOLD
will be disappeared now. (See Fig.9)
4Press the MAXHLD key again and
MAXHOLD will be displayed. (See
Fig.10) The meter is now ready to
measure the actual machine noise.
5Turn on the machine you want to
measure and note the new sound
level reading. This number represents
the sound level of the device without
the background noise. If there is no
change in the reading, the
background noise is greater than the
noise of the device.
6Press the MAXHLD key and then the
BA MODE key to exit background
noise absorber mode.
Fig.9
60 +10
FAST
UNDR
A
Fig.10
60 +10
FAST
UNDR
A
MAX HOLD
Dieses Handbuch passt für folgende Modelle
1
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