BRUEL & KJAER 1621 - Frequency Control Auto

Adjustment Procedure 1621.2
Frequency Controi Auto
FILTER "3%"
FREOUENCY RANGE "2002k"
SWEEP CONTROL "Manual"
MAX VOLTAGE: "1 V"
SWEEP CONTROL: "Aula"
SWEEP CONTROL: "Manual"
SWEEP CONTROL: "Auto"
Input signal: 200 Hz, 1 V
AdjusI FREOUENCY TUNING for max. vol lage on "Filler Oulput"
AdjuSI P201 (ZH 0159) for max. vallage on "Filler Oulput".
Ch ange Input FreQuency lO 2 kHz and adjusI FREOUENCY TUNING for max voltage on "Filter
Output",
Short circuit pin 1 1 on V202 (ZH 0159) to ground.
Remove
the jumper between R204 and R21 1
Connect a cable
for filter synchronization between Level Recorder Type 2306 and "Sync"
on 1621.
Press SWEEP CONTROL for "Start" of sweep.
After one decade the "Auto" lamp will extinQuish and 1621 will remain tuned in 102kHz.
Adjust P202 for max. voltage on "Filter Output"
Alter adjustment rem ove the short circuit and mount jumper belween R204 and R211
9.77
Valid from serial no. 6941 26
2-3