BRUEL & KJAER 1617 - Fixed Averaging Time Analysis with the Level Recorder Type 2307

3. Adjust the Band Pass Filter as described in section 3.3 .1/ 3 with the following
changes :
AVERAGING CONTROL, Program
and Min . Time switches
AVERAGING TIME switch
(rear panel)
Select a program to suit the current measuring as-
signment . For a more comprehens ive description
on use of the programs see section 4.2 .2 .
" Variable "
4 . Adjust the Level Recorder as described in section 3 .3 .1/ 4 .
RECORDING MODE : " DC"
5. Calibrate the pen displacement of the Recorder according to section 3 .3 .1/ 5, or 6
as
required .
6 .
Synchronize the paper transport as descr ibed in section 3 .3 .1/ 8 , 9 , 10, 11 , and
12 .
7 .
Apply the signal to be analyzed to the input terminal of the Measuring Amplifier .
8 . Switch the Level Recorder PEN DRIVE " On" .
9. Switch the Band Pass Fi lter RANGE to the frequency range required .
10 . Turn the MANUAL FILTER SELECTOR to the first band of the analysis .
11 . Start analysis and recording by pushing the right-hand FILTER CONTROL MODE
switch to "Run " .
The averaging time in the Measuring Amplifier is automatically switched to the pro-
grammed value for the frequency band being measured . The Level Recorder is held
stati onary fo r a period of five times the averaging time, while the rectifier circuits
and the pen position stabilize on the signal level. The Measuring Amplifier is then
switched to an averaging time of 10 seconds (or longer) to hold the pen deflection ,
while the Recorder starts and drives forward a distance proportional to the step size
selected, to give a plot of the level in that band. Then the Filter steps to the next fre-
quency band and the programmed averaging time for that band is selected while the
Recorder reverts to its hold function .
3.3.3. Fixed averaging time analysis with the Level Recorder Type 2307
22
1. Connect the instrumentation as shown in Fig .3 .9 .
2.
Adjust the Measuring Amplifier as described in its Instruction Manual, and in sec-
tion 3 .3 .1/ 2 .
3 .
Adjust the Band Pass Filter as described in section 3.3 .1/ 3.
4 . Make the preli minary adjustments and load Range Potentiometer , frequency cali-
brated paper, etc ., as described in the Level Recorder Instruction Manual, operations
section , and adjust the controls of the 2307 as follows :
POTENTIOMETER
RANGE Set according to the Potentiometer in use