Applied Instruments XR-3 Operation Manual page 52

XR-3 TS2 Module Operation Manual XR-3
Cursor Position
Press Up/Down arrow keys to move cursor line vertically to different amplitude levels on the y-
axis. The level (Level) at the cursor position is shown in the bottom center area of the screen.
Note: Signal Level displayed will depend on whether you have selected dBm, dBmV, or dBµV in
the Options menu.
Press Left/Right arrow keys to move cursor horizontally to different frequencies on x-axis. The
frequency (Freq) of the cursor position is also shown in the bottom center area of the screen. To
jump to a particular frequency, press ENTER, then use numeric keypad to type in desired
frequency and then press ENTER again.
Span
Press the 1 key on the numeric keypad to zoom in (less span). This will cut the displayed span in
half around the cursor's frequency position. Minimum span is 50 MHz.
Press the 3 key on the numeric keypad to zoom out (more span). This doubles the displayed
span around the cursor's frequency position. Full span is 1250 MHz (i.e. 900 to 2150 MHz).
Paging
Paging allows you to change the start and stop frequencies (when not at full span) while
maintaining the same span. This allows you to quickly jump through the full range of frequencies.
Press the upper left soft-key to "page" to the left. Press upper right soft-key to "page" to the right.
Amplitude Range
The default amplitude range shown on the spectrum display is -75 to -15 dBm. Press the LVL
soft-key near bottom left corner of the screen to perform auto level scaling. Each time you press
the LVL soft-key, the instrument will rescale the amplitude range according to the min/max
amplitude levels detected during the last sweep. The auto level scaling makes the measured
signal levels more obvious and easier to see.
Spectrum screen before pressing LVL to perform auto level scaling:
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