7
English
essarily: Set the sliding switch (9) to the position
“OFF”.
If the meter is not used for a longer period,
the battery should be removed to prevent dam-
age to the device in case of battery leakage.
5 Measuring the Sound Level
1)
For a precise measurement, check the calibration
beforehand: Set the sliding switch (9) to the
position “CAL”. 94.0 dB should be displayed. If
not, adjust the trimming control (5) by means
of a screw driver so that 94.0 dB is displayed.
2)
For measuring the sound level in accordance
with the auditory sensation of the human ear,
set the sliding switch to the position “A”. In the
position “C”, the physical sound level is meas-
ured (linear).
3)
For measuring, hold the meter horizontally
with the microphone (1) pointing to the sound
source.
4) After switching on, the lower measuring range
35 – 100 dB is always selected. On the left side
of the display “Lo” is indicated.
When measuring values exceeding 100 dB,
“OVER” is indicated at the right bottom of the
display. In this case, switch to the upper range
65 – 130 dB with the key Lo / Hi (3). Instead of
“Lo”, “Hi” is displayed.
When measuring values below 65 dB in the
upper range, “OVER” is also indicated. In this
case, return to the lower range with the key
Lo / Hi.
5)
After switching on, the dynamic measuring
mode is set to sound levels changing fast. On
the right side of the display, “F” (fast) is indi-
cated. For measuring sound levels changing
slowly, switch to the second mode with the
key S / F (4). The indication changes from “F”
to “S” (slow).
6) For holding the present value measured, press
the key HOLD (8). At the top of the display
“DATA HOLD” is indicated. To return to the
present value measured, actuate the key HOLD
once again.
7)
To determine the maximum level occurring, press
the key MAX (6). At the top of the display “MAX
HOLD” is indicated. Now the level value of the
highest volume occurring after actuating the key
MAX will be held. For switching off the function,
actuate the key MAX once again.
Notes:
a The sound level measured largely depends on the
distance of the meter from the sound source. When
measuring, observe a defined distance (e. g. 1 m for
speaker measurements) or state the distance at which
the measurement was made.
b The level measured also depends on the angle to the
sound source. It may be necessary to measure the lev-
els at different angles (but at the same distance) to
determine the sound radiation be haviour of the sound
source.
5.1 Picking up a Microphone Signal or
a DC Voltage proportional to Level
At the output jack (7), the following voltages are
pres ent to be picked up for a control depending on
the level or for further analysis. For this purpose,
connect a 3-pole 3.5 mm plug to the jack.
Signals at the 3.5 mm plug connected
tip – body:
microphone signal
in the lower measuring range “Lo” 38 mV/dB
in the upper measuring range “Hi” 8.3 mV/dB
impedance 100 Ω
ring – body:
DC voltage proportional to level 10 mV/dB
impedance 100 Ω
6 Specifications
Display: � � � � � � � � � � � � � 17 mm LCD, 3½ digits
Measuring ranges
Lo (low):� � � � � � � � � � � 35 – 100 dB
Hi (high): � � � � � � � � � � 65 – 130 dB
Resolution: � � � � � � � � � 0�1 dB
Accuracy: � � � � � � � � � � � ±1�5 dB at 94 dB, 1 kHz
Frequency range: � � � � � � 31�5 – 8000 Hz
Level weighting: � � � � � � A or C
Type of microphone: � � � electret microphone
Output jack (signals at the plug)
tip – body: � � � � � � � � � microphone signal,
impedance 100
Ω
ring – body: � � � � � � � � DC voltage proportional to level
10 mV/dB, 100
Ω
Ambient temperature: � � 0 – 40 °C
Power supply: � � � � � � � � 1 × 9 V battery
Dimensions, weight: � � � 63 × 253 × 30 mm, 250 g
Subject to technical modification.
All rights reserved by MONACOR
®
INTERNATIONAL
GmbH & Co. KG. No part of this instruction manual
may be reproduced in any form or by any means for
any commercial use.
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