Microsoft LPF-00004 Instrukcja Operatora Pobierz pdf (Strona 144)

Page 126 ADJUSTMENT PROCEDURES

YBER

380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.

2 V

10 ms

Figure 39. The upper trace shows the output during the notch test when the notch filter is badly tuned. The lower trace

shows the output when the notch filter is correctly tuned. The output when the notch filter is tuned contains many

harmonics. The vertical scaling is the same for both traces. The signal input was internally generated using the Notch

Test command.

Repeat the procedure for channels 2 to 8, adjusting trim potentiometers RP202 to RP802,

respectively.

Turn off the notch Test with a keyboard keystroke. This resets the CyberAmp to the settings that

were in place before the tuning began.

Other Adjustments

The other trim potentiometers inside the CyberAmp have been adjusted at the factory and should not

need to be changed. The potentiometers labeled RP101 to RP801 are used to calibrate the accuracy of

the D/A converters used to generate the DC offset for each channel. The potentiometer labeled RP1 is

used to calibrate the precision 5.000 V reference supply. In the normal life of the instrument, these

potentiometers should not require adjustment.

If the CyberAmp 380 requires repair, the simple adjustment procedures for these potentiometers will

be clear to an electronics professional who consults the circuit diagrams.

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Microsoft LPF-00004 Instrukcja Operatora Strona 144