Extech Instruments 420 Dokumentacja Pobierz pdf (Strona 67)

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67

V5.1‐March2010

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z One of the following two prompts will display at the bottom-left of the screen

when the Format is set to Vrms.

— CH1 voltage level

— FFT vertical position

Press the blue button VOLTS POSITION; the following will appear:

— CH2 OFF

9. If the FFT source is CH2, press the blue button VOLTS POSITION ,

z One of the following three prompts will display at the bottom-left of the screen

when the Format is set to dB.

— FFT dB level

— CH2 voltage level

— FFT vertical position

z One of the following two prompts will display at the bottom-left of the

screen when the Format is set to Vrms.

Press the red button VOLTS POSITION; the following screen will appear:

—CH1 OFF

10. When the FFT source is CH1:

z If the display at the bottom left side of the screen is "

-FFT dB level ", use

the red buttons VOLTS POSITION▲ and ▼ to adjust the dB value

(the DIV selections include 1dB 2dB 5dB 10dB and 20dB).

z If the display at the bottom left side of the screen is "

-CH1 voltage

level", use the red buttons VOLTS POSITION▲ and ▼ to adjust the voltage

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Extech Instruments 420 Dokumentacja Strona 67