_____________________________________ Section 1: General Information
8197 Instruction Manual
Page 1-5
Output Options:
The following options are available for various Model
8197 applications:
Option 03 Distribution Amplifier: Allows the Model
8197 to drive Spectracom distribution products. This
option adds a 12 Volt DC offset to the rear panel
Frequency Outputs.
Option 06: Changes the Frequency Outputs and the
front panel 10-MHz output to 12.8 MHz.
Option 07: Changes the Frequency Outputs and the
front panel 10 MHz output to 5.0 MHz.
Option 08: Changes the Frequency Outputs and the
front Panel 10 MHz output to 1.0 MHz.
1.5.3
Frequency Standard Stability
Locked Accuracy:
24-Hour Average accuracy is typically ±1 x 10
-12
when
locked to GPS.
Unlocked Accuracy:
Corrections are applied to the Rubidium oscillator
based upon learned aging. Holdover accuracy is
typically <2 microseconds/day.
Short Term:
3 x 10
-11
/ 1 second.
1 x 10
-11
/ 10 seconds.
3 x 10
-12
/ 100 seconds.
Recovery:
During a power failure, the oscillator control value is
retained and the connected standby supply provides
power to the oscillator and GPS receiver. At power-
on, the disciplined oscillator returns to the set
frequency plus any incurred aging.
Without standby power Rubidium lock < 4 minutes @
25
°
C, Oscillator Lock < 4 hours. Retrace 5 x 10
-11
.
Aging Rate:
2 x 10
-11
/day under constant ambient conditions.
1.5.4
1 PPS Output
Signal:
One pulse-per-second square wave derived from the
GPS receiver.
Connector:
BNC female, front panel.
