Voltcraft DL-161S

Voltcraft DL-161S

Status	in progress
Connectivity	USB
Frequency range	31.5Hz - 8kHz
Measurement range (A)	30dB - 130dB
Accuracy (94dB@1kHz)	1.4dB
Frequency weighting	A, C
Time weighting	F, S
Standards	IEC 61672-1 Class 2
Website	Voltcraft

The Voltcraft DL-161S is a sound level meter with USB connectivity.

See Voltcraft DL-161S/Info for more details (such as lsusb -vvv output) about the device.

This is a rebadged CEM DT-173.

Hardware

TODO

Protocol

The host sends commands and receives responses via a virtual serial port, with USB bulk endpoint 2 as a backend. A command consists of a single byte followed by any arguments to the command.

Command	Response	Description
0x0c	0xff	Calibrate device, 2 bytes payload:
	1	Calibration value, as a signed integer between -10 and 10, where 1 represents 0.1 dB
	2	Unused (0x00)
0x0e	0xff	Configure device
		1-2 Length of data to follow, as a little-endian integer. 3 "REC" LED flash interval, in seconds: 0=none, 10, 20, 30. 4 Bitfield representing the following flags: 7 Activation: 0=immediate, 1=manual 6-5 Unused 4 0=store measurements, 1=real-time 3 Frequency weighting: 0=dBC, 1=dBA 2 Time weighting: 0=Slow, 1=Fast 1-0 Unused 5 Sample interval 1-7, representing 50ms, 500ms, 1s, 2s, 5s, 10s, 60s respectively. 6 Last two digits of year, e.g. 0x0d for 2013 7 Month, 1-12 8 Day of month, 1-31 9 Hours 10 Minutes 11 Seconds 12-14 Number of samples to acquire, as a big-endian integer. 15 Alarm low threshold 16 Alarm high threshold
0x0d	0xff	Get stored measurement count, 2 bytes payload:
	1-2	Always 0x0000?
		Response has 3 byte payload, representing the number of bytes used in sample memory as a little-endian integer. Each sample uses two bytes.
0x0f		Get stored measurements, 2 bytes payload is offset into buffer (as pages? page size?)
		1 2 Sample rate 1-7, as above. 3 4 5 6

Resources

• Device manual