Rear Panel Auxiliary Signals
Ref er ence In put (“REF IN”) Char ac ter is tics
The ref er ence in put pro vides the abil ity to syn chro nize the internal sam ple rate
gen er a tor to an ex ter nal sig nal. The sam ple rate need not be at 1:1 ra tio to the
ref er ence, but will be locked to the ref er ence over the fully spec i fied range of sam ple
rate and Ref er ence in puts. PLL band width is ap prox i mately 5 Hz.
In put for mats 28 kHz–200 kHz AES/EBU,
NTSC, PAL, or SECAM video, or
8 kHz–10 MHz square wave.
Sam ple Rate Res o lu tion
8 kHz–65 kHz 1/128 Hz [0.0078125 Hz].
65 kHz–256 kHz 1/32 Hz [0.03125 Hz].
256 kHz–1 MHz 1/8 Hz [0.125 Hz].
1 MHz–4 MHz ½ Hz [0.5 Hz].
4 MHz–10 MHz 2 Hz.
In put Am pli tude 200 mVpp–5.0 Vpp.
In put Im ped ance Selectable ter mi nated or high im ped ance.
AES/EBU (XLR) Nom i nally 110W or 5kW.
Video/TTL (BNC) Nom i nally 75W or 5kW.
Lock Range ±0.0015% [±15 PPM].
In put De lay from –12.7 to +115.1 UI [–10 to +90% of frame] in
Ref er ence Dis play sec onds, ±60 ns, AES/EBU signals only.
Ref er ence Rate Dis play Mea sures ap prox i mate ref er ence in put rate.
Reference Output (“REF OUT”) Characteristics
Intended to drive de vices un der test that re quire their own ref er ence in put. The
ref er ence out put sig nal is not jit tered.
Out put for mat AES/EBU (per AES3-r1997).
Out put Sam ple Rates 8 kHz–216 kHz, locked to front panel out put.
Sta tus Bits For mat “Pro fes sional,”
Type “Grade 2 ref er ence,”
Or i gin “SYS2,”
Reliability flags im ple mented,
CRCC im ple mented,
Time of Day not im ple mented,
Sam ple Count not im ple mented.
Rear Panel Auxiliary Signals Chapter 6: Specifications
Getting Started with Your 2700 Series Instrument 87
Figure 64.
Miscellaneous digital I/
O Panel (rear of SYS-
2720 and SYS-2722
instruments only).
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