BNC 1105 Universal Counter - Manual (Page 145)

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Sets or queries the start arm for Phase measurements.
Return
A sequence of ASCII-encoded bytes. IMM means Immediate and EXT means
External.
Note
This will be set to Immediate after the counter has been turned off or a remote
interface reset.
[:SENSe]:ROSCillator:EXTernal:FREQuency?
Under the timeBase measurement, (Fno) will be shown on the counter display if there is
no inputted frequency, or (Fxx) will be shown on the counter and “Not a number” on the
PC side if the inputted frequency is an invalid value. On the other hand, the command
ROSCillator:SOURce will reply “Not a number” under the INTernal condition, and
“1.00000E+007” under the EXTernal condition.
Return
Numeric data transferred as ASCII bytes in format with six significant digits.
Note
If the current reference timebase is internal or if the current reference timebase is
external, but the frequency is not known, Not A Number 9.91E37 will be returned.
[:SENSe]:ROSCillator:SOURce INTernal|EXTernal
Sets or queries the current reference timebase.
Return
A sequence of ASCII-encoded bytes. INT means that the timebase is internal
reference. EXT means that external.
Notes
Specifying the reference timebase automatically disables
[:SENS]:ROSC:SOUR:AUTO ([:SENS]:ROSC:SOUR:AUTO OFF).
When [:SENS]:ROSC:SOUR:AUTO ON, this query tells which timebase reference is
used.
Save/recall operation does not apply on this value.