BRUEL & KJAER 1617 - Analysis with Variable Averaging Time Using the Level Recorder Type 2306

The paper is now synchronized so that the spectrograms will be accurately posi-
tioned on the preprinted chart .
13 . Apply the signal to be analyzed to the input terminal of the Measuring Amplifier .
14. Switch the Recorder PEN DRIVE " On ".
1 5 . Set the MANUAL FILTER SELECTOR of the Type 1 61 7 to the frequency at which the
scan is to start.
16 . Switch the Band Pass Filter RANGE to the frequency range required .
17 . Start analysis and recording by pushing the right-hand FILTER CONTROL MODE
switch to "Run " .
The Level Recorder will start to run and will drive the recording paper forward unt il
the end of the calibrated chart . Each time the pen passes the chart position for a fil-
ter change , the filter in the Type 1 61 7 will step to the next frequency under the con-
trol of the Type 2306 .
Simultaneous ly, the signal level in the frequency band is plotted out by the Recorder
pen to yield a frequency spectrogram . At the end of the scan, the Type 1617 resets
itself to the starting frequency , but before the next chart can be plotted the paper
must be pushed forward by hand to the starting point on the next chart length .
Note: Do not release the PAPER DRIVE button , or the exact filter shift position will
be lost .
3.3.2. Analysis with variable averaging time using the Level Recorder Type 2306
20
To achieve correct analysis with variable averaging time w i th Type 2607, resistor R 693
shown in Fig .3 .6, on circuit card ZL 0013 must be replaced by 100 O . This change is
valid for all series of Type 2607 .
R es istor R 693
Mete r Funct ion
*
~ • t===§Z L ~0~0 1 ~4 = =1
~ ZL0013
ZH 0011 I ZE 0018 ~
--= ~ ,--II ZF 0008 B" ~~j ~' t===§Z L~0~01;:,2 = =1
ZI0002 I ZE 0052 ~ ZL 0011
~ ZG 0005 ZE 0035 ZH 0012
r f.~ -%-~.z~ ZG 0038
1= = =lL!Z IF 0006 ZS 0167 ZF 00 13
IL ~ ~ ~
ZH 0013 Measuring Amplifier [ ZHOO46 I
Type 2607 ~
AttlM'lUOtor
1"'J),Hoki +r.ak I ".'
!lIIp"ful •••• -~
. Ma •. P.o~ lin
Card P osi ti ons
770810
Fig . 3. 6. Location of resistor R 693