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6 Input/Output

6.6 Freq Ref Input

6.6.2 Ext Ref Freq

This key tells the instrument the frequency of the external reference. When the

external reference is in use (either because the reference has been switched to

External or because the Reference has been switched to Sense and there is a valid

external reference present) this information is used by the instrument to determine

the internal settings needed to lock to that particular external reference signal.

For the instrument to stay locked, the value entered must be within 5 ppm of the

actual external reference frequency. So, it is important to get it close, or you risk an

unlock condition.

Note that this value only affects the instrument’s ability to lock. It does not affect

any calculations or measurement results. See "Freq Offset" in the Frequency section

for information on how to offset frequency values.

Remote Command

[:SENSe]:ROSCillator:EXTernal:FREQuency <freq>

[:SENSe]:ROSCillator:EXTernal:FREQuency?

Example Set the external reference frequency to 20MHz, but does not select the external reference:

:ROSC:EXT:FREQ 20 MHz

Select the external reference:

:ROSC:SOUR:TYPE EXT

Dependencies Still available with Internal or Pulse selected, to allow setup for when External is in use. However, the

setting has no effect if the Internal Reference is in use (Freq Ref In set to Internal, Pulse, or SENSE:INT

or SENSE:PULSE)

Not available in UXM

For VXT models M9420A/10A/11A/15A/16A and M9410E/11E/15E/16E: only 100 MHz is available

Preset Unaffected by Mode Preset, Input/Output Preset, or Restore Defaults, Input/Output, but set to

100MHz for VXT models and 10MHz for other models, by Restore Defaults, Misc, or Restore Defaults,

All, or Default External Ref Freq

State Saved Power On Persistent (survives power cycle)

Min/Max See "Minimum & Maximum Values" on page 2242

Minimum & Maximum Values

Model Min Max

CXA, N897xB, E7760B, M8920A/20B, CXA-m 10MHz 10MHz

EXA without option R13 10MHz 10MHz

EXA with option R13 10MHz 20MHz

MXA, PXA, EXM 10MHz 50MHz

Vector Modulation Analyzer Mode User's &Programmer's Reference 2242

Keysight x-series Programmer's Reference

Other manuals for Keysight x-series