Endoacustica offers, Exclusive Customer Service and free Training
KMR-361 · Ultrasonic detection
KMR-361 ultrasonic detector and receiver
KMR-361 makes ultrasonic signals audible through heterodyne frequency conversion. Choose the compact basic receiver for listening and detection, or the professional model for 16-bit recording to CompactFlash, selectable sample rates up to 768 kHz and time-expanded playback.
- Basic model: specified 10–120 kHz frequency range.
- Professional model: specified 5–235 kHz frequency range.
- Heterodyne conversion for audible monitoring.
- Professional model includes recording and saved operating profiles.
- Portable, battery-powered equipment.
Product code: KMR-361
Price on request
Request pricing for the basic or professional model.
Technical consultation, training and support.
+39 080 302 6530
Ultrasonic listening and recording options
Audible signal monitoring
Heterodyne conversion shifts the selected ultrasonic signal into the audible range for listening and detection.
Compact basic receiver
An electret microphone, backlit frequency display and 150 g weight including battery suit portable checks.
Professional recording
Capture 16-bit WAV files on CompactFlash with date and time, manual or automatic triggering and saved profiles.
Full description
Basic model: portable heterodyne detection
The basic KMR-361 is a compact ultrasonic receiver for locating and listening to emissions outside normal human hearing. Heterodyne conversion makes the selected signal audible, while the backlit digital display shows the tuned frequency.
An electret microphone covers the specified minimum range of 10–120 kHz. Receiver bandwidth is 8 kHz, or ±4 kHz at −6 dB. Two 3.5 mm outputs support headphones and an external recorder.
The receiver uses one 9 V IEC 6LF22 battery and weighs 150 g with the battery installed. Dimensions are 119 × 60 × 25 mm including the knob. Idle current draw is 17 mA with the LCD backlight included.
Listening-focused field checks
The basic model suits checks where the priority is identifying and listening to ultrasonic activity. Its compact format supports moving between inspection points; recording is handled by an external device connected to the recorder output.
Professional model: acquisition and playback
The professional KMR-361 combines heterodyne operation, divide-by-10 frequency division and a built-in 16-bit CompactFlash recorder. Its specified minimum frequency range is 5–235 kHz, with tuning resolution that changes across the range.
Saved profiles recall sample rate, triggering mode, time-expansion factor and LED intensity. Record the direct ultrasonic signal, heterodyne output or frequency-divided signal without a separate recorder.
Event capture and recording documentation
Record spoken comments during direct acquisition or in a dedicated lower-sample-rate comment mode. Direct recordings can replay automatically with selectable time-expansion factors from 1 to 30.
Start and stop recordings manually or use level-activated triggering with optional frequency selection to capture unexpected events. WAV files include date and time and transfer to a PC through a standard CF-card reader. The optional serial GPS connection supports storing position data in the files.
The professional model runs on five AA batteries, with alkaline or NiMH recommended, or an external 7–10 V DC supply.
Technical specifications
| Type | Heterodyne |
|---|---|
| Microphone | Electret |
| Frequency range | 10–120 kHz, specified minimum coverage |
| Listed frequency step | ±0.15 kHz |
| Bandwidth | 8 kHz (±4 kHz), −6 dB |
| Battery | 1 × 9 V IEC 6LF22 |
| Idle current | 17 mA, including LCD backlight |
| Dimensions | 119 × 60 × 25 mm, including knob |
| Weight | 150 g, including battery |
| Outputs | Two 3.5 mm jacks for headphones and recorder |
| Type | Heterodyne and divide-by-10 frequency division |
|---|---|
| Frequency range | 5–235 kHz, specified minimum coverage |
| Heterodyne resolution | 0.1 kHz below 17.8 kHz; 0.2 kHz at 18–43 kHz; 0.5 kHz at 43.5–107 kHz; 1 kHz at 108–235 kHz |
| Audio output | 3.5 mm stereo jack; load ≥32 Ω |
| HF/MEM output | 3.5 mm stereo jack; load ≥500 Ω; approximately 600 mV RMS at 0 dB |
| Batteries | 5 × AA; alkaline or NiMH recommended |
| External power | 7–10 V DC; 250 mA minimum, 700 mA maximum |
| Dimensions | 170 × 80 × 35 mm, excluding microphone |
| Weight | 600 g, including batteries |
| A/D converter | 16 bit |
|---|---|
| Anti-aliasing filter | Adaptive |
| Sample rates | 32, 44.1, 48, 96, 100, 192, 200, 250, 300, 384, 400, 500, 750 and 768 kHz |
| Time-expansion factors | 1, 2, 3, 5, 10, 20, 30 |
| D/A converter | 12 bit |
| Storage and format | CompactFlash card; WAV files with date and time |
| Recordable signals | Direct ultrasonic, heterodyne and frequency division |
| Triggering | Manual or level-activated, with optional frequency selection |
| Functions | Saved profiles, spoken comments and automatic playback after direct recording |
| Interface | RS-232 |
|---|---|
| Protocol | NMEA 0183 |
| Decoded sentences | GPGLL, GPGGA and GPRMC |
| Baud rate | 4,800 baud |
| Function | Stores position data in recording files |
Specification pending clarification: the source also lists “5 kHz sampling rate” with a reference to 20 kHz when the high-pass filter is enabled. Its meaning remains unconfirmed. Recorder sample rates are listed separately above.
Applications
Ultrasonic interference checks
Identify and listen to ultrasonic emissions when investigating interference affecting audio equipment.
Precision-process inspection
Check for ultrasonic activity generated during precision processes and select the frequency of interest for audible monitoring.
Documented field measurements
The professional model records events with spoken notes and timestamps. Optional GPS input adds position data to the files.
Technical consultation and support
Model selection
Compare the basic receiver’s listening functions with the professional model’s integrated recording capabilities.
Configuration and training
Get support with operating profiles, acquisition modes and CompactFlash file handling.
Technical assistance
Review power requirements, audio outputs and the optional GPS interface.
Explore the range
Related products
Compare alternatives selected for their function, supported bands, and form factor.
EN-GAS-DECTAcoustic gas leak detector
Dedicated equipment for acoustic emissions associated with gas leaks.
ENGT-18Digital stereo contact microphone
Contact listening system with DSP processing and USB recording.
KMR-358Unidirectional microphone kit
Ultra-cardioid microphone with wind protection and adjustable +6 to +50 dB preamp.
FALENAFALENA microphone array
Directional array with DSP processing and recording.
Technical consultation
Select your KMR-361 model
Tell us which frequencies you need to detect and whether you need onboard recording. We can help you compare the basic and professional versions.
Or call us: +39 080 302 6530