The TES-1352H is a Sound Level Meter with datalogging and RS-232 software capabilities, designed to comply with IEC 61672-1:2003 Class 2, IEC60651: 1979 Type 2, and ANSI S1.4: 1983 Type 2 standards. This instrument is suitable for measuring sound levels under a variety of conditions, offering ease of use and a large, easy-to-read display.
Function Description:
The primary function of the TES-1352H is to measure sound pressure levels. It can display the current time-weighted sound pressure level (SPL) with either "A" or "C" frequency weighting, as well as the maximum time-weighted sound pressure level (SPL MAX) with "A" or "C" frequency weighting. The device supports both FAST (125ms time-constant) and SLOW (1s time-constant) time weightings for RMS detection, in accordance with IEC 61672-1 Class 2.
The instrument features a datalogging capability, allowing storage of up to 32,000 measurement records, which can be split into a maximum of 255 blocks. These recorded data can be downloaded to a computer via an RS-232 serial port for analysis. The device also offers AC and DC signal outputs through a standard 3.5mm coaxial socket, making it suitable for connection to a frequency analyzer, level recorder, FFT analyzer, or graphic recorder. A real-time clock with calendar function is integrated.
Important Technical Specifications:
- Applicable Standards: IEC 61672-1:2003 Class 2, IEC60651: 1979 Type 2, ANSI S1.4: 1983 Type 2.
- Measurement Functions: Current time-weighted sound pressure level (A or C), Maximum time-weighted sound pressure level (A or C).
- Total Range: 30 to 130dB.
- Max. Measurement Level: 130dB.
- Total Linear Operating Range (A-weighted, 1000Hz): 30dB to 130dB.
- Level Range Selection: 5 ranges in 10dB steps: 30-90dB, 40-100dB, 50-110dB, 60-120dB, 70-130dB.
- Frequency Range (Overall characteristics including microphone): 31.5 to 8000Hz.
- Frequency Weighting: A and C (meets IEC 61672-1 Class 2 requirements).
- Time Weighting (RMS detection): FAST (125ms) and SLOW (1s) (according to IEC 61672-1 Class 2).
- Reference Conditions:
- Acoustic Field: Free
- Sound Pressure Level: 94.0dB (related to 20µPa)
- Level Range: 60 to 120dB
- Frequency: 1000Hz
- Temperature: +23°C
- Relative Humidity: 50%RH
- Static Pressure: 101.325 kPa
- Incidence Direction: Perpendicular to the front of the microphone diaphragm.
- Calibration: Acoustic using sound calibrator.
- Check Frequency: 1000Hz.
- Nominal Calibration Level (Free Field): 94.1dB.
- Nominal Calibration Level (Diffuse Field): 94.0dB.
- Frequency for Acoustic Testing: 8000Hz.
- Warm-up Time: ≤2min.
- Sampling Interval: Bar graph indication (125 ms approx.), Numeric indication (1 sec approx.).
- Data Record Capacity: Max. 32000 data, Max. 255 blocks.
- Display: 4-digit numerical indication (30.0 to 130.0dB with 0.1dB resolution), Bar-graph (1dB resolution), Sound level range indicator, Time display (year-month-day, hour:minute:second).
- Display Update Rate: 1 second.
- Warning Indications: "OVER" (upper limit exceeded), "UNDER" (lower limit exceeded).
- AC Output: 1Vrms (at full-scale), 5kΩ impedance, ≥1MΩ load impedance. Output voltage in calibration mode (-6dB from scale upper limit, 1000Hz sine wave) is 0.5Vrms.
- DC Output: 10mV/dB, 5kΩ impedance, ≥1MΩ load impedance. Output voltage at 94dB is nominally 0.94V DC.
- I/O Connector: RS-232 for control signals and data output.
- Clock: Real-time with calendar.
- Power Requirements: 4 x 1.5V IEC R6P (size “AA”) manganese super heavy duty batteries or equivalent.
- Battery Life: Approx. 50 hours.
- Internal Back-up Battery: Maintains real-time clock for at least 6 months (if fully charged).
- External Power Source: DC voltage from 5V to 12V (Approx. 10mA @ 6V).
- Operating Conditions: -10°C to +50°C, 30% to 90%RH non-condensing.
- Storage Conditions: -10°C to +60°C, <70%RH non-condensing.
- Effect of Temperature: < 0.5dB (-10 to +50°C).
- Effect of Humidity: < 0.5dB (for 30%RH to 90%RH at 40°C, 1000Hz).
- Dimensions: Approx. 265(L)×72(W)×36(H) mm.
- Weight (including battery): Approx. 380g.
- Supplied Accessories: Instruction manual, Batteries, Adjustment screwdriver, PC software, Windscreen, RS-232 connecting cable, 3.5φ plug, Carrying case.
- Optional Equipment (Not supplied): AC adaptor, Sound calibrator.
Usage Features:
- Controls:
- Microphone: Electret Condenser microphone.
- Display: LCD shows sound level (numeric and bar graph), operation mode, measurement parameters, warnings, and real-time clock/calendar.
- Power Button (Φ): Turns the instrument on and off.
- Level Buttons (▲/▼): Selects one of five level ranges (30-90dB, 40-100dB, 50-110dB, 60-120dB, 70-130dB). Also used to increment/decrement setting values.
- MAX Button: Toggles between current SPL reading and maximum time-weighted sound level (MAX mode). In MAX mode, the "MAX" indicator appears.
- A/C Button: Sets frequency weighting to "A" or "C" mode.
- FAST/SLOW/RECORD Button:
- Time Weighting: Selects FAST (125ms) or SLOW (1s) time weighting.
- Data Record Mode: Press and hold for 3 seconds to enter/exit data recording mode. "RECORD" indicator flashes when recording.
- Erase All Records: Turn off the instrument, then press and hold this button while turning the instrument on until "CLr RECORD" appears.
- I/O Connector: RS232 input/output for control signals and measurement data.
- AC Output Socket: Provides AC signal with selected frequency weighting.
- DC Output Socket: Provides DC signal corresponding to sound level.
- CAL Potentiometer: Used for level adjustment during calibration.
- External DC Power Supply Socket: Type 1.3 coaxial connector (centre negative, nominal 6V DC).
- Tripod Mounting: 1¼" - 20 UNC Female thread for long-term measurements.
- Windscreen: Reduces wind noise and strong air movement effects during outdoor measurements or when measuring air conditioning equipment.
Maintenance Features:
- Instrument Care:
- Do not remove the microphone mesh cover.
- Protect from impact, water, dust, extreme temperatures, high humidity, and direct sunlight.
- Protect from air with high salt or sulfur content, gases, and stored chemicals.
- Turn off after use.
- Remove batteries if not used for a long time to prevent leakage.
- Do not leave exhausted batteries in the instrument.
- Clean with a soft, dry cloth or a cloth lightly moistened with water; avoid solvents, alcohol, or cleaning agents.
- Battery Installation:
- Replace batteries when the low battery indication symbol (E) appears.
- Ensure correct polarity when inserting four AA batteries.
- Always replace all four batteries at the same time; do not mix old and new batteries or different types.
- Remove batteries if the instrument will not be used for a month or longer.
- External Power Source:
- Can be powered by an optional external 6V DC supply (5V to 12V).
- Ensure correct polarity when connecting an external power source to prevent damage.
- Calibration Procedure:
- Recommended to calibrate before and check after each set of measurements.
- Involves using a sound calibrator (e.g., 1000Hz, 94dB) and adjusting the CAL potentiometer to match the certified pressure level.
- Data Management:
- Recorded data can only be reviewed after downloading to a PC.
- Recorded data cannot be displayed on the instrument.
- Stored data can be erased using a specific button sequence.
- Software: Detailed instructions for RS-232 interface, software installation, and operation are provided on the attached CD-ROM.
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