Chapter 7 477
Language Reference
FREF Frequency Reference
FREF Frequency Reference
Syntax
Figure 7-118 FREF Syntax
Description
The FREF command specifies the frequency reference source. Select
either the internal frequency reference (INT) or supply your own
external reference (EXT). An external reference must be 10 MHz (±100
Hz) at a minimum amplitude of 0 dBm. Connect the external reference
to J9 (10 MHz REF IN/OUT) on the rear panel. When the external
mode is selected, an "X" appears on the left edge of the display.
Preset State
Internal
Query Response
Figure 7-119 FREF Query Response
Example
10 INPUT "WHAT IS THE FREQUENCY REFERENCE SOURCE (INT OR
EXT)",Src$
20 OUTPUT 718;"FREF ";Src$;";"
30 PRINT "SOURCE SELECTED IS",Src$
40 END
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