HBK Bruel & Kjaer 3670-A-082, User Manual

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23
Chapter 5
Verify Type 3670 Functionality
For a quick check of Type 3670’s functionality before using the instrument, the following procedure can be
used.
1) Install the USB Audio Driver and the optional USB Audio Tool on the PC.
2) Connect the instrument to the PC using USB Cable AO-0728.
3) Connect the mains power to the instrument using Power Supply ZG-0448.
a) Both the Power and Status LEDs on the instrument should light green.
b) Open the USB Audio Driver by clicking
in the PC Toolbar and check on the Status page that
USB
Audio Driver 2.0
is displayed.
4) Start the USB Audio Tool – it will be listed under
Start
>
Programs
.
5) Set the Input parameters in the USB Audio Tool:
•
Channels
:
8
• (input):
Autospectra
• (weighting function):
Flat Top
, which is best suited for sine waves
• (averaging):
Exponential
•
Averages
:
10
6) Set the Output parameters in the USB Audio Tool:
•
Channels
:
2
•
Type
:
Sin
(sine)
•
Freq. (Hz)
:
1000
•
Level (Vrms)
:
1.000
7) On the instrument, connect an output channel to an input channel using a BNC-to-BNC cable.
8) Click
Start
in the USB Audio Tool.
9) Check that the signal levels in the time and FFT signal displays correspond to the Level set on the
generator, adjusted for the sensitivity of the selected channel (can be found in the included Factory
Standard Calibration Certificate).
10) Repeat steps 6 – 8 for all input channel and output channels.
11) Attach a CCLD microphone to an input channel and click
Start
in the USB Audio Tool.
12) Connect a calibrator to the microphone.
13) Check that the levels in the time and FFT signal displays correspond to the combined level of the
calibrator, adjusted for the microphone sensitivity and the input sensitivity of the selected channel (can
be found in the Factory Standard Calibration Certificate).
14) Repeat steps 10 – 12 for all input channels.