XLi Time & Frequency System 11
XLi-man, Issue 8, 6/17/2008, Rev. H
2
5
1
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
The Frequency Measurement (Freq Meas) option: measures an external frequency applied to the J3
input relative to the XLi’s disciplined frequency.
See “F113 – J3 Input (Aux Ref, Freq Meas)” on page 146.
1 PPS – Pulse Per Second Output
If a time reference is unavailable, 1 PPS is as stable as the frequency reference (e.g., the system
oscillator or Aux Ref).
CODE – Time Code Output
Time Code Output Specifications - Modulated (AM) and Demodulated (DC or DCLS)
Many IRIG reader devices only decode the BCD time-of-year (TOY) portion of the IRIG frame. Reader
devices designed to the IRIG-B122, B002, A132, A002 standard should be compatible with the XLi’s
time code outputs.
Frequency: 1, 5, 10 MHz
Resolution 120 x 10-12@ 1 Second Interval
12 x 10-12@ 10 Second Interval
1 x 10-12@ 100 Second Interval
Range 1000 x10-6
Impedance: 1 kΩ, 50 Ω
Factory Configuration: Disabled
Accuracy
Refer to
“System Time & Frequency Accuracy” on page 6
Pulse width: 20 μS ±1 μS
On time edge: Rising
Amplitude: TTL Levels into 50 Ω
Quantity: 1
Connector: Female BNC
Format: IRIG-B120, B000, B120 1344, B000 1344
IRIG-A130, A000
NASA 36
Amplitude (AM): 3 Vp-p, into 50Ω ±10%
Ratio (AM): 3:1 ±10%
Amplitude (DC): TTL into 50Ω
Quantity: 1
Connector: Female BNC
Phasing: In phase with carrier ± 10 μS
Default Configuration: IRIG-B 120
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