GF-8801, GF-8802, GF-8803
Hardware Specifications
SE19-410-006-00
5
4 1PPS and Clock (VCLK, GCLK) Signal Specifications
The follow is the specifications of 1PPS and clock (GCLK, VCLK). Please refer to the eSIP Protocol
Specification for switching setting etc. The performance described in this chapter is measured and evaluated
under the environment shown in Figure 4-1 and 4-2 below. In the absence of any notes, measurement
conditions are default setting, open sky, constant at 25 degree (no wind).
GF-880X
Evaluation Board
GNSS rooftop
antenna
Universal counter
53132A
Reference GNSS DO
[*1]
1PPS
1PPS
10MHz
CH1
CH2
REF IN
phase
delay
Figure 4-1. 1PPS measurement environment
GF-880X
Evaluation Board
GNSS rooftop
antenna
Universal counter
53132A
Reference GNSS DO
[*1]
VCLK,GCLK
10MHz
10MHz
CH1
REF IN
clock
Figure 4-2. Clock measurement environment
[*1] GNSSDO equipped with rubidium oscillator calibrated by USNO (United States Naval Observatory).
The definition of the terms is as follows.
MAX|TE|: It is a maximum time error (absolute value) of 1PPS for UTC time.
MTIE: Maximum time interval error. It is a relative MIN-MAX value of 1PPS.
SDEV, TDEV: Standard deviation and Time deviation. They show 1PPS fluctuation.