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6 997-01530-01, Rev. C-25, Jan 2008
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J2 - Optional Programmable Pulse Out (PPO)
The PPO allows generation of a precisely synchronized trigger pulse at an arbitrary time and with
arbitrary pulse width in integer multiples of 1
μS. The rising edge of the trigger output can be
programmed to occur with 1 us resolution.
J3 – Optional Frequency Measurement
The Frequency Measurement (Freq Meas) option: measures an external frequency applied to the J3
input relative to the XL-GPS’ disciplined frequency.
1 PPS Out
A time-stable 1 PPS (one pulse per second) output is provided. If no reference is available, the 1 PPS
pulse will be as stable as the internal oscillator.
Pulse width: Programmable in 1 μS steps
On time edge: Rising
Amplitude: TTL Levels into 50 Ω
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
“Time and Frequency Accuracy” on page 3
Pulse width: 20 μS +/-1 μS
On time edge: Rising
Accuracy:
Refer to
“Time and Frequency Accuracy” on page 3
Amplitude: TTL Levels into 50 Ω
Qty: 1
Connector: BNC female