Safety Instructions for Device Operation
This device complies with EU directives 2004/108/EC (electromagnetic compatibility) and 2006/95/EC (low voltage), as specified in the amendment 2004/22/EC (CE mark). Pollution degree 2.
For the operational safety of the device and to avoid serious injuries due to short circuits or overvoltages, the following safety instructions for device operation must be observed. Damages resulting from non-observance of these instructions are excluded from any claims.
- Do not expose the device to extreme temperatures, direct sunlight, extreme humidity, or moisture.
- Observe warning labels on the device.
- Operation in areas with highly fluctuating air pressure conditions (aircraft, high altitudes) can negatively affect measurement accuracy.
- Do not operate the device near strong magnetic fields (motors, transformers, etc.).
- Avoid strong vibrations of the device.
- Keep hot soldering irons away from the immediate vicinity of the device.
- Before starting operation, the device should be stabilized to the ambient temperature. (Important when transporting from cold to warm rooms and vice versa).
- Do not place the device with its front side on the workbench or work surface to avoid damage to the operating elements.
- Do not make any technical changes to the device.
- Opening the device and performing maintenance and repair work may only be carried out by qualified service technicians.
- Measuring devices do not belong in the hands of children!
Cleaning the Device
Clean the device only with a damp, lint-free cloth. Use only commercially available detergents. When cleaning, ensure that no liquid enters the interior of the device. This could lead to a short circuit and destruction of the device.
1. General Information
The digital sound level meter complies with safety regulations according to EN 61672-1 Class 2 and offers the choice between automatic and manual range selection. It enables sound level measurements from 30 to 130 dB in 4 ranges with a resolution of 0.1 dB.
The internal background noise suppression circuit ensures accurate sound level measurements even in the presence of strong background noise.
The comprehensive technical features include switchable response times (fast/slow), A and C weighting, and a maximum value hold function.
Furthermore, the device has AC/DC analog outputs, an internal measurement memory for 32000 readings, and a USB interface for connecting the sound level meter to a PC.
2. Connections and Controls on the Device
The PeakTech 8005 Sound Level Meter features a microphone at the top, an LCD display, and various control buttons on the front. The side and bottom house connection ports and the battery compartment.
- Windscreen
- LCD Display
- REC Button: Activates USB connection for real-time measurements and activates the data logger (internal memory) without USB connection.
- SETUP Button: For device settings; activates USB connection for data transfer.
- FAST/SLOW Toggle Button
- MAX/MIN Toggle Button
- LEVEL Button: For manual range selection.
- Backlight Button: To turn the backlight on and off.
- A/C Selection Button: For frequency weighting.
- HOLD Button: For measurement hold function.
- On/Off Button
- External Input for 9V Power Adapter
- USB Interface Cable Connection
- AC/DC Analog Output Connection
- Potentiometer for Calibration
- Threaded Connection for Tripod
- Battery Compartment
- Microphone
3. Measurement Operation
The measured value is displayed as a digital value on the LCD and in the form of a bar graph. The digital measured value is updated every 160 ms, the bar graph every 40 ms.
- Turn on the device with the On/Off button. For measurement, point the microphone towards the sound source to be measured.
3.1. Selection of A and C Weighting
When the device is switched on, it is automatically in A-weighting mode. A-weighting is based on human hearing perception and should always be used for outdoor sound level measurements. Application areas include, for example, environmental monitoring, workplace assessment (ergonomic design of the workplace), and public services (police, etc.).
C-weighting has a neutral frequency response and no amplitude fluctuations. This weighting is particularly suitable for measuring and analyzing machine and engine noise.
To switch to C-weighting, press button (9) A/C. Pressing the button again switches back to A-weighting. When the device is switched on, it is automatically in A-weighting mode. The currently active weighting is indicated by the illumination of the corresponding symbol (dBA or dBC) on the LCD display.
3.2. Selection of Response Time (Fast/Slow)
The response time of the device can be changed or switched between fast and slow to determine or measure various criteria. For general criteria and measurements, a slow response time and A-weighting are advantageous or recommended.
When the device is switched on, the fast response time is automatically selected. To switch to slow response time, press button (5) FAST/SLOW. The currently active response time is indicated by the illumination of the corresponding symbol (fast or slow) on the LCD display.
FAST: fast time weighting (125 ms/measurement)
SLOW: slow time weighting (1s/measurement)
3.3 Recording Maximum and Minimum Measured Values
MAX/MIN Button: Displays the maximum/minimum measured value. Press this button once to switch to MAX/MIN measurement mode. The display shows MAX. The maximum measured value is captured and held until a higher value is measured. If you press the button again, MIN will be displayed. The smallest measured value is now captured and held until a new, lower value is measured. By pressing the button again, you can exit MAX/MIN measurement mode.
HOLD Button: By pressing the HOLD button, the value displayed on the screen can be “frozen”.
On/Off Button: To turn the measuring device on or off.
Power Supply (9V): For connection to the 9V power adapter.
USB Interface: The USB signal output is a serial 9600 bps interface.
AC/DC Signal Output: The device features an AC/DC output port. The AC output provides 1 Vrms corresponding to each range step with an output impedance of 100 Ω. The DC output provides 10 mV/dB with an output impedance of 1 KΩ. The connector is a standard audio jack with DC output on the tip, AC output on the ring, and ground on the sleeve.
3.4. Switching from Automatic to Manual Range Selection
The sound level meter has 4 measurement ranges:
- AUTO: 30 ... 130 dB
- LO: 30 ... 80 dB
- MED: 50 ... 100 dB
- HI: 80 ... 130 dB
When the device is switched on, the manual range selection function is activated. This is an advantage when measuring unknown quantities, as the required range is already preset and the measured value is displayed faster.
The device offers the option to switch to automatic range selection. This is indicated by the AUTO symbol lighting up on the LCD display. The switch to the respective range occurs automatically depending on the measured noise level, thus guaranteeing the highest measurement accuracy. The 2-digit LCD display to the left of the bar graph shows the lower limit of the selected range.
To switch to manual range selection as described:
- Press the LEVEL button (7) until
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