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 <NR3> 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.