Ramsey Electronics SG560 Guia do Utilizador descarregar pdf (Página 27)

BASIC OPERATION

2.10 Using the Frequency Meters

The frequency meters are selected by pressing

METER SELECT multiple times. There are me-

ters unique to both RECEIVE AM and RECEIVE

FM modes.

Any of these meters may be zoomed for a larger display for easy viewing. To zoom a display,

press SHIFT, . Function keys.

Example:

To select meter mode

To zoom a display for easy viewing

RECEIVE Level Meters

Counter Freq Meters

FM Mode: Meter Displayed Description

2.10.01 This meter displays the instantaneous modulation

packet showing the minimum and maximum level. It displays

a maximum of +/- 6 kHz deviation whether or not the

received signal is on frequency. Each division represents

1kHz; this display is showing +3 kHz/-4.2 kHz.

2.10.02 This reduces the scale to +/- 4 kHz. This allows more

resolution for detecting smaller signals without having to

zoom.

2.10.03 This meter is a numeric version of the above meters.

+/- 4 kHz FM Deviation

Bargraph Meter

Digital

FM Deviation Meter

+/- 6 kHz FM Deviation

Bargraph Meter

FM Mode: Meter Displayed Description

2.10.04 Displays a quickly updated percent of AM calibrated

demodulation. Every tick indicates 10%. This meter indicates

50% modulation, and the slow peak-hold point (larger

square) indicates a peak of 65% modulation.

2.10.05 Displays percent of demodulated AM. Accuracy is +/-

5%, but better than +/-1% using 1kHz tones.

Percent of AM

Bargraph Meter

Digital Percent of AM

Meter

COM3010 Meter Displays

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Ramsey Electronics SG560 Guia do Utilizador Página 27