BRUEL & KJAER 2307 - Brüel & Kjær 2307 Adjustment Procedure - Amplifier Performance; Writing System Overshoot Check; Output Amplifier Balance Adjustment

2307.2 Adjustment Procedure
~ o. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Briiel & Kjcer
2.4 . Overshoot
PEN DRIVE : "On "
INPUT
ATTENUATOR: "0"
INPUT POTENTIOMETER : "10"
WRITING SPEED : "800 mm/s "
LOWER LIM. FREO.: "200 Hz"
RECTIFIER RESPONSE: "RMS"
POTENTIOMETER RANGE: " 50 dB"
WRITING WIDTH : "50 mm"
PAPER DRIVE FUNCTION : "Cont. Forward "
PAPER SPEED: "1 mm/sec"
Paper: OP 0102 (OP 0224)
2.5. Balance of Output Amplifier
PEN DRIVE: "Off"
2-2
-
Max 1
mm
0.....-- I.....-- i....-- ~
QP 0102
Input signal : 400 mY, 1000 Hz .
Start the paper drive by pressing START .
Disconnect the i nput signal and check the overshoot when the signal is applied again.
Overshoot : max. 1 mm .
If necessary adjust P 6. Resolution.
Whenever P
6 is adjusted check the resolution power , item.2 . 3
Possible reason for fault :
Power
Am L
>
Writi ng speed too high. Check item 2.2
Measure the DC voltage across the driving coil (measuring Point E 8): 0 V ± 0.5 V.
If necessary adjust P 8 , Balance.
If it is impossible to adjust connect a 10 kn potentiometer "P " to the 12 V zener diodes as shown
and connect the resistor R 140 to the slider.
Then adjust " P" for 0 V across the driving coil to see if the output stage alone can be balanced
(adjustment range approx . ± 18 V).
If 0 V can be obtained now the most possible reason for a fault is V 31 .
10.75