Pioneer SPEC-2 Manuale di servizio - Pagina 14

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6 . 2 C U R R E N T L I M I T E R S E N S I T I V I T Y

ADJUSTMENT

Note:

The high output power of the SPEC-2 requires a

dummy load of 4O and more than 200W. If a

200W dummy load is not available, connect two

8S}, 100W loads in parallel.

Connect as shown in Fig. 14.

Set SPEC-2 impedance selector switch to 8O

(even though a 4O dummy load is used).

While the voltmeter indicated 30V/(40 ), adjust

VR2 to just distorted point the upper half of

the waveform.

In the same manner, adjust VR3 to just dis-

torted point the lower half with 28.3V/(44).

Waveform

1 )

2 )

3 )

V R 3

Voltmeter

Osilloscope

ooo

AF signal generator

F i g . 1 3 T h e P o s i t i o n o f V R 2 a n d V R 3

/ | ilPur

Fig. 14 Connection Diagram for Current Limiter Sensitivity Adjustment