XLi Time & Frequency System 91
XLi-man, Issue 8, 6/17/2008, Rev. H
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F71 – Oscillator Statistics
Use F71 to display the phase, frequency offset, drift rate, and DAC value of an internal or optional
external oscillator.
Definitions:
The phase is the instantaneous error in seconds between the oscillator and the control loop zero servo
point. The frequency offset is computed using an averaging time that is equal to the effective averaging
time of the oscillator controller. The oscillator Drift Rate is computed using a 24-hour average and is the
daily Drift Rate of the oscillator. The oscillator DAC value is the signed 16-bit integer that controls the
DAC output voltage. It ranges from 0 to 65536.
Command Line
To display the F71 settings, enter:
F71<CR>
XLi responds using the following format:
F71<S>phase=<SIGN><MULT>E<SIGN><EXP><S>s<S><S>offset=<SIGN><MULT>E<SIGN><EXP><S><S>dr
ift=<SIGN><MULT>E<SIGN><EXP>/DAY<S><S>DAC=<SIGN><INT><CR><LF>
where:
For example, enter:
F71<CR>
XLi responds:
F71 PHASE=-5.678E-09 s OFFSET=-1.986E-07 DRIFT= 6.013E-08/DAY DAC=24567<CR><LF>
F = ASCII string indicating function F71
<S> = ASCII space character one or more.
<MULT> = multiplier, 4 digits with decimal point.
E = ASCII character E for exponent.
s = ASCII character s for seconds abbreviation
<SIGN> = - for negative or <S> for positive.
<EXP> = 2 digit exponent.
/DAY = ASCII characters, units of Drift Rate
<INT> = integer, 5 digits
<CR> = carriage return.
<LF> = line feed.
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