53210A Measurements 3
Keysight 53210A User’s Guide 83
[SENSe:]ROSCillator:EXTernal:FREQuency
{1E6|5E6|10E6|MINimum|MAXimum|DEFault}
[SENSe:]ROSCillator:EXTernal:FREQuency? [{MINimum|MAXimum|
DEFault}] (query form)
The external reference frequency setting is 10 MHz when the counter is shipped
from the factory or following the
SYSTem:SECure:IMMediate command. The
setting is stored in non-volatile memory and is not changed after a reset (
*RST) or
instrument preset (
SYSTem:PREset or Preset key).
External Reference Example
The following example configures the counter to tune to an external reference if
present, and the expected external frequency is 10 MHz.
SENS:ROSC:SOUR:AUTO ON // tune to external ref if present
SENS:ROSC:EXT:FREQ 10E6 // signal will be 10 MHz
Detecting a Valid External Reference Signal
ExtRef will appear in the top, right corner of the display when a valid (external)
reference is present. If a valid frequency is not present or was not specified, the
message “No valid external timebase” is displayed. The error is also logged in the
error queue.
The presence of a valid external reference can be determined programmatically
with the command:
[SENSe:]ROSCillator:EXTernal:CHECk ONCE
Prior to sending the command, SENSe:ROSCillator:SOURce EXTernal and
SENSe:ROSCillator:SOURce:AUTO OFF must be set.
The following example checks for an external reference signal applied to the Ext
Ref In connector.
SENS:ROSC:SOUR EXT // set source, also disables
// automatic source selection
SENS:ROSC:EXT:CHEC ONCE // check for valid signal
SYST:ERR? // read the error queue
The error queue can be read from the front panel as follows:
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