Query reference clocks (time base) statuses.
Query response format:
<used_ref_status> is one of
<int_ref_status> is one of
<ext_ref_status> if one of
This query provides extensive information about currently used reference clocks and the state of internal and external reference clock signals. The response contains 3 fields separated by commas.
First field indicates which time base is currently in use: internal (
INT), external (
EXT) or none (
Second field indicates status of internal time base reference:
Third field indicates whether external reference signal is connected (
10MHz) or not (
SEND → :ROSC:STATE?
READ ← EXT, INT OK, EXT 10MHz