3,3 kO
0
iii ....•
& Is tl.,..........
a ' *- t ^,a,
410000M '41t 4.0
tfteersuji
190291
Fig.4.2. Modification of Level Recorders Type 2306 before serial
no. 576700
1. Connect the Band Pass Filter, Measuring Amplifier and Level Recorder as shown in
Fig.4.1.
2. Fit the Level Recorder with a 50 dB Range Potentiometer, plus pen and roll of fre-
quency graduated Recording Chart QP 01 43 or QP 0124.
3. Set Level Recorder controls
SENSITIVITY
RECORDING MODE "AC Log", "DC log" or "DC Lin" whichever is ap-
propriate for Measuring Amplifier output signal.
See Level Recorder Instruction Manual.
WRITING SPEED/LF LIMIT Lower frequency limit and effective averaging
time suitable for recording section 5.3.3
PEN DRIVE "On"
PAPER SPEED As required, but not "30 mm/s" See section
5.3.4
PAPER DRIVE "Off"
POWER "On"
The pointer of the BATTERY indicator should deflect to the right-hand region of its
scale. If in the left hand region, replace or recharge the internal batteries of the Le-
vel Recorder.
4. Calibrate the Band Pass Filter and Measuring Amplifier combination as described in
items 1 to 4 of section 3.2.
5. Keeping the reference source connected, step the INPUT SECTION ATTENUATOR
17
To Next Page
Loading...
