J2 - optional programmable pulse out (ppo), J3 - optional frequency measurement, 1 pps out – Symmetricom XL-GPS User Manual

Page 16: J3 – optional frequency measurement, Time and frequency accuracy” on page 3

997-01530-01, Rev. C-25, Jan 2008

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

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 k

Ω, 50 Ω

Factory Configuration:

Disabled

Accuracy

Refer to

“Time and Frequency Accuracy” on page 3

Pulse width:

μS +/-1 μS

On time edge:

Rising

Accuracy:

Refer to

“Time and Frequency Accuracy” on page 3

Amplitude:

TTL Levels into 50

Qty:

Connector:

BNC female