BRUEL & KJAER 1617 - Operation with Other Brüel & Kjær Instruments

These reference voltages are used as follows to calibrate the X-deflection of the
pen.
6 .
Set the left-hand FILTER CONTROL MODE switch on the Type 1617 to "Recorder" .
7 . Adjust the X axis zero position of the Recorder so that the pen rests at the starting
point of the lowest frequency band in the scan.
8 .
Set the left-hand FILTER CONTROL MODE switch to "Manual" .
9. Adjust the X sensitivity of the Recorder so that the pen now rests three decades fur-
ther along the paper.
10. Repeat steps 6 to 9 until the adjustment is completely correct at both Voltages.
11 . Return the left-hand FILTER CONTROL MODE switch to "Recorder" .
12 . Calibrate the Y (= level) axis .
This will depend upon the measuring arrangement, and type of X-V Recorder in use,
but generally will follow the same basic principle as outlined for the Level Recorders
in
sections 3.3 .1 and 3 . 3.3 .
13 . Apply the signal to be analyzed to the input socket of the Measuring Amplifier .
14 . Start the plot-out of the spectrogram by pushing the right-hand FILTER CONTROL
MODE switch on the Band Pass Filter to "Run" .
The averaging time in the Measuring Amplifier is automatically switched to the pro-
grammed value for the frequency band being measured . The Recorder pen is held
stationary in the X-axis for a period of five times the programmed averaging time .
During the next period of 5 times the averaging time, the pen moves in eight equally
spaced steps through the width of a 1/ 3-octave band, or in 24 steps through the
width of a 1/ 1-octave band . Then the filter steps to the next band and a new wait-
ing period starts. This sequence is repeated until the frequency scan is complete .
15 . If the starting frequency has to be changed, calibration of the X-axis is changed by
using the zero adjustment only .
3.4 . OPERATION WITH OTHER BRUEL & KJA:R INSTRUMENTS
3.4.1. Operation with Sound Level Meter Type 2203 and Type 2209
28
Frequency analysis can be performed by using the Band Pass Filter as an external filter
with either Sound Level Meter on sound or vibration signals . The Precision Sound Level
Meter Type 2203 can make sound level measurements according to IEC R 179 for preci-
sion sound level meters, DIN 45633 part 1, and ANSI S1.4-1971 Type 1. Its frequency
range is from 10Hz to 18kHz, with a dynamic range of 25 to 140 dB(A). The Impulse
Precision Sound Level Meter Type 2209 meets the same standards as the Type 2203,
and has an extended low frequency range down to 2 Hz . In addition, it includes an RMS
and peak hold facility, and the ability to measure impulsive signals according to IEC R
179A and DIN 45633 part 2.
1.
Connect the measuring instruments as shown in Fig.3.12 . Note that the arrange-
ment is not truly portable as a line supply is required for the Band Pass Filter .