Arbiter Systems, Inc. · 1 324 Vendels Circle, Suite 1 21 · Paso Robles, CA 93446 · USA
Tel: +1 .805.237.3831 · Fax: +1 .805.238.571 7 · E-mail: sales@arbiter.com · Internet: http://www.arbiter.com
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TIMING AND FREQUENCY PRODUCTS
Model 1 084A/B/C Specifications
Receiver Ch
a
racteristics
Timing Accuracy
Specifications apply at the 1 PPS output, in the presence
of Selective Availability (SA), as of date of publication.
UTC/USNO ± 1 00 ns rms, 1 PPS output
Typical < 40 ns rms, in Position-Hold Mode
Internal Oscillator
Standard DCXO, 1 x 1 0
-7
, unlocked
Allan variance (locked and in Position-Hold Mode)
1 second 5 x 1 0
-1 0
(2 x 1 0
-1 0
, typical)
1 day 5 x 1 0
-1 3
Synchronization
CMOS output signals are synchronized to the 1 PPS
output, ± 50 ns maximum.
IRIG-B modulated, ± 1 µs maximum
The leading edge of the start bit of a received RS-232
data message may be selected to trigger the Event A
input, providing synchronization with 1 00 ns resolution.
Position Accuracy
1 0 meters, rms, 90 % confidence
Satellite Tracking
Twelve (1 2) channel, GPS-L1 , C/A code (1 575.42 MHz).
Receiver simultaneously tracks up to twelve satellites.
Results from all tracked satellites are averaged in Position-
Hold Mode or, with Position-Hold Mode off, using least-
squares estimation.
Acquisition
1 50 seconds typical, cold start
1 5 minutes, 90 % confidence, cold start
40 seconds, typical, with almanac < 1 month old
1 5 seconds, typical, with ephemeris < 4 hours old
The GPS Data Backup Battery is included in all Model
1 084s. This feature improves acquisition time by supplying
constant power to the real-time clock and RAM in the
GPS receiver module.
I/O Configuration
Connectors
Three standard; one IRIG-B modulated connector and
two user-configurable connectors:
1 . IRIG-B modulated, bus driver, 4 Vpp, 20 ohms source
impedance, drives a 50-ohm load at 3 Vpp
2. IRIG-B unmodulated or Programmable Pulse; jumper-
selectable
3. 1 PPS, IRIG-B unmodulated or IRIG-B modified
Manchester; jumper-selectable
Jumper-selectable outputs are 5 V CMOS bus drivers
with 1 0 ohms source impedance and ± 75 mA drive capability.
Relay Contacts
Two (2) sets, Form C (SPDT) fail-safe, 0.3 A at 1 30 Vdc;
one is Locked function; the second one is jumper-
selectable and may be Fault, 1 PPH, or Programmable Pulse
Programmable Pulse Output
Four modes:
• Every 1 s to 60,000 s, starts top of the minute
• Hourly at a specified offset
• Daily at a specified time of day
• One shot at a specified time of year
Pulse duration is programmable from 0.01 seconds to
600 seconds, except in one-shot mode, where the output
is Low prior to the specified time and High thereafter.
Event A Input
One input is available as an alternate function, with a
simple hardware modification to the 1 PPS configurable
output. The input may be configured to accept an external
1 PPS signal and measure the deviation from 1 PPS/GPS
with 1 00 ns resolution. Each input may also be configured
to record up to 500 sequential events with 1 00 ns
resolution, provided that the events are separated by
1 1 ms. Event data is stored in battery-backed RAM.
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