Microsoft LPF-00004 Manuale dell'Operatore Scaricare il pdf (Pagina 31)

FUNCTIONAL CHECKOUT Page 13

CYBERAMP 380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.

9) Issue the command:

CMD300 FILTER OFF GAIN 1

to bypass the low-pass filter on all channels.

Select channel 1 on the rotary dial in the audio monitor section on the front panel. Move the

toggle switch to the

TONE

position. Rotate the

VOLUME

control to its midpoint. Rotate the

SQUELCH/FREQUENCY

control to about three quarters of maximum. The tone should

rapidly change between two frequencies. Adjust the

SQUELCH/FREQUENCY

control to

change the baseline frequency of the tone. Now shift the toggle switch to the

CLICK

position. This should result in a series of clicks at ten Hertz. The

SQUELCH/FREQUENCY

control now determines the level that must be exceeded to produce a click, and is used to

mask baseline noise.

Switch the audio monitor off.

10) Issue the command:

CMD300 TEST NOTCH

to activate the notch filter and simultaneously generate a test waveform at the line frequency

(60 Hz in some countries and 50 Hz in others). Set the oscilloscope controls to 100 mV/div,

10 ms/div, LINE triggered. If the notch filter of the CyberAmp as set at the factory matches

the line frequency, the waveform should be less than 50 mV

p-p

. This waveform is not a simple

sine wave -- it consists of many harmonics of the line frequency. If the notch filter was

not

set at the factory to the line frequency being used, the sinusoidal wave will be about

600 mV

p-p

. If the notch filter needs to be tuned to the line frequency, refer to the section

Tuning the Notch Filter on page 125.

11) Finally, to re-set the CyberAmp to the factory defaults, issue the command:

CMD300 INITIALIZE

The above procedure verifies that all the circuits are in working order.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 156 157

Nessun commento

Microsoft LPF-00004 Manuale dell'Operatore Pagina 31