Pin no.
Signal
1
Positive supply terminal
2
Negative supply terminal
•
USB mini B connector, Wurth Electronics 65100516121 to data transmission with PC.
1
5
Fig. 2.4. USB mini B connector – external view.
Pin no.
Signal
1
VBUS
2
D-
3
D+
4
not connected
5
GND
2.3. Default instrument settings
Default settings of DLM-101 after instrument turn-on are specified below:
•
Frequency weighting
A
•
Time weighting
FAST
2.4. Preparation of the instrument to operation
Screw WK-21 measurement microphone on PW-21L microphone preamplifier. Take off
microphone protecting cap. Connect this assembly to LEMO microphone connector. If
microphone extension cable is to be used, insert it between microphone preamplifier and
microphone connector. Place windscreen on the microphone. Using windscreen is recommended
regardless of weather conditions, because it gives the microphone additional protection against
dust. Turn the instrument on.
Default instrument setup is specified in chapter 2.3. Now it is recommended to perform acoustic
calibration of the instrument as described in chapter 4.3.
After measurements completion, turn the instrument off and place protecting cap on the
microphone.
3. OPERATION
All functions of the instrument are invoked using the keyboard, but access to functions critical
for measurement is difficult. To activate this function selected key should be hold down for
about 1.5 second.
Power of the instrument can be switched on or off by hold down power switch
for about
1.5 second.
The scheme of transitions between menu screens is shown on Fig. 3.1. All menus are described in
details in this chapter.
