Model 1084A/B/C GPS Satellite Clock (40ns)
Model 1084A/B/C GPS Satellite Clock (40ns)
Value driven version of Model 1088B, featuring the same high accuracy, reliability and many of the same feature-extending options.
Model 1084A/B/C User Manual
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Model 1084A/B/C User Manual Espanol
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Model 1084A/B/C Data Sheet
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Focused on high performance and maximum value, the Model 1084A/B/C delivers many of the same high end performance, features and flexibility of the 1088B precision time clock, but at lower cost.
Three BNC connectors deliver several output options supporting IRIG-B modulated, and various combinations of IRIG-B unmodulated, Programmable Pulse (supporting multiple output modes) and 1 PPS. All are high drive outputs capable of driving multiple loads wired in parallel.
Like the 1088B but with a single option slot, Model 1084A/B/C supports options for an internal Network Time Protocol (NTP), four configurable fiber optic outputs, COMTRADE Sample Rate Generator, Power System Time, Frequency and Phase Monitor, a second RS-232 port and more.
Model 1084A/B/C is available with three front panel configurations. See Key Features for more information.
- Highest accuracy, <40ns typical; <100ns worst case
- Three BNC connectors (optional terminal strip connector available)
- Optional Fiber Optic support
- NTP compatible
- Two Form C (SPDT) fail-safe relays, locked and jumper selectable
- Event input support
Versions A/B/C offer various interface options (see photos):
- 1084A supports four LEDs for monitoring operating status.
- 1084B adds to the LEDs an LCD display and keypad, providing easy access to setup and system status information.
- 1084C includes both the operating status LEDs, the LCD display and keypad, and includes a large LED time display.
Receiver Characteristics
Timing Accuracy
| Accuracy Note | Specifications apply at the 1 PPS output, in the presence of Selective Availability (SA), as of date of publication. |
| Accuracy UTC/USNO | ±100 ns rms, 1 PPS output |
| Typical | < 40 ns rms, in Position-Hold Mode |
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 100 ns resolution.
Position Accuracy
10 meters, rms, 90% confidence
Satellite Tracking
Twelve (12) channel, C/A code (1575.42 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
- 150 seconds typical, cold start
- 15 minutes, 90% confidence, cold start
- 40 seconds, with almanac less than 1 month old
- 15 seconds, with ephemeris less than 4 hours old
The GPS Data Backup Battery is included in all Model 1084s. This feature improves acquisition time by supplying constant power to the real-time clock and RAM in the GPS receiver module.
Oscillator
| Standard | DCXO, 1x10-7, unlocked |
| Allan Variance | (locked to GPS, in Position-Hold Mode)
|
I/O Configuration
Output Connectors
Three BNC, one IRIG-B Modulated and two user-configurable:
- IRIG-B Modulated, bus driver, 4 Vpp, 20 ohms source impedance, drives a 50-ohm load at 3 Vpp
- IRIG-B unmodulated or Programmable Pulse; jumper-selectable
- 1 PPS, IRIG-B unmodulated or IRIG-B modified Manchester; jumper-selectable
Jumper-selectable outputs are 5 V CMOS bus drivers with 10 ohms source impedance and ±75 mA drive capability.
Event Inputs
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 100 ns resolution. Each input may also be configured to record up to 500 sequential events with 100 ns resolution, provided that the events are separated by 11 ms. Event data is stored in battery-backed RAM.
Programmable Pulse Output
Four modes:
- Every 1 to 60,000 seconds, 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 to 600 seconds, except in one-shot mode, where the output is Low prior to the specified time and High thereafter.
Relay Contacts
Two (2) sets, Form C (SPDT) fail-safe, 0.3A at 130 Vdc; one is Locked function; the second one is jumper-selectable and may be Fault, 1 PPH, or Programmable Pulse
Interface
Operator
| Display |
|
| Functions |
|
| Status LEDs |
|
| Keyboard | Eight keys (Models 1084B/C only) |
| Setup |
|
System
| RS-232 |
|
| RS-422/485 | Transmit Only |
Power Requirements
Standard
| Voltage | 85 to 264 Vac, 47 to 440 Hz, 20 VA maximum or 110 to 350 Vdc, 15 W maximum |
| Inlet | IEC-320 with fuse and mating cordset. Specify option P01 - P10 Available cordset plug style and specifications are described in the Options and Accessories section. |
General
Physical
| Size | 1 RU rack mount or tabletop, 260 mm deep FMS, Rack mounts included. |
| Weight | 2 kg (4.5 lbs), net |
| Antenna | 0.75 in. pipe (1 in. - 14 marine) thread Cable Connection: F-type |
| Antenna Cable | Type: RG-6, 15 m (50 ft) provided |
| Mounting | 0.75 in. pipe (1 in. - 14 marine) thread |
Environmental
| Temperature | Operating: 0 °C to +50 °C (-20 °C to +70 °C typical) |
| Humidity | Noncondensing |
| EMC | Radiated susceptibility: passes walkie-talkie test. Conducted emissions: power supply complies with FCC 20780, Class A and VDE 0871/6.78 Class A. Surge withstand capability (SWC), power inlet: designed to meet ANSI/IEEE C37.90-1 and IEC 801-4 |
Certificates and Approvals
CE makr/label and certificate
Except as noted otherwise, only one I/O Option may be installed. Available options are listed below and described in the Options and Accessories section.
| I/O | |
|---|---|
| 1084opt03 | Four Additional Configurable Outputs |
| 1084opt06 | Parallel BCD Output, 1 ms Resolution |
| 1084opt17 | Parallel BCD with Second RS-232 Port |
| 1084opt19 1 | Second RS-232 Port |
| 1084opt20 2 | Fiber-Optic, Type ST 820 nm |
| 1084opt20A | Four Configurable Fiber-Optic Outputs |
| 1084opt23 | COMTRADE Sample Rate Generator |
| 1084opt27 | 8-Channel High Drive IRIG-B Output |
| 1084opt28 | Power System Time, Frequency and Phase Monitor |
| 1084opt29 | Four Additional Outputs with Dry Contact and +25/50 Vdc |
| 1084opt32 | Internal Network Time Protocol (NTP) Server |
| 1084opt33 | Dual Internal Network Time Protocol (NTP) Server |
| General | |
| 1084opt01 | LCD Backlight |
| 1084opt04 | On/Off Switch (1084A/B/1093A/B) |
| Power (select only one) | |
| 1084opt07 | IEC-320 Power Inlet 85 to 264 Vac RMS, 110 to 370 Vdc |
| 1084opt08 | 10 to 60 Vdc Terminal Power Strip and Surge Withstand |
| 1084opt10 | 85 to 250 Vac RMS, 110 to 350 Vdc Terminal Power Strip and Surge Withstand |
1 May be combined with other I/O options that do not include an additional RS-232 port
2 May be combined with other I/O options
| Included | |
|---|---|
| AS0028200 | Rack Mount Kit |
| AS0031000 | Operation Manual (1084) |
| AS0087800 | Arbiter Universal GPS Antenna |
| CA0021315 | 15 m (50 ft) RG-6 Antenna Cable |
| P01-P10 1 | Country specific power cord with straight female end Country specific plug and power cord cable with straight female end.
|
| Available | |
| AS0033100 | Rack Slide Kit |
| AS0044600 | GPS Antenna Mounting Kit |
| AS0044700 2 | 21 dB In-Line Pre-amplifier Adds a minimum of 21 dB of gain at the GPS L1 frequency (1.575 GHz), when used with Arbiter Systems GPS-Controlled
Clocks. |
| AS0044800 | RG-11 Crimp Tool + 25 F-type Connectors |
| AS0048900 | Antenna Grounding Block Kit |
| AS0049000 | GPS Surge Protector Kit |
| AS0062000 | High Interference GPS Antenna and Mounting Adapter Kit |
| CA0021302 | 2 m (6 ft) RG-6 Antenna Cable |
| CA0021306 | 6 m (20 ft) RG-6 Antenna Cable |
| CA0021330 | 30 m (100 ft) RG-6 Antenna Cable |
| CA0021345 | 45 m (150 ft) RG-6 Antenna Cable |
| CA0021360 | 60 m (200 ft) RG-6 Antenna Cable |
| CA0021375 | 75 m (250 ft) RG-6 Antenna Cable |
| CN0027700 | F-type, RG-6 Antenna Cable Crimp-on Connector |
| TF0006000 | F-type, RG-11 Antenna Cable Crimp Tool |
| TF0006400 | RG-6 Crimp Tool |
| TF0013200 | Antenna Cable Stripping Tool, RG-6 |
| TF0013300 | Antenna Cable Stripping Tool, RG-11 |
| WC0004900 | 300 m (1000 ft) Roll RG-11 Cable |
1 Only applies if Power Option 07 is ordered
2 Used for cable length greater than 75m (250ft)
GPS Substation Clock Requirements
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IRIG-B Time Code Accuracy, IED and System Design Issues
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NERC PRC-08 Compliance Statement
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Time in the Power Industry: How and Why We Use It
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Why GPS Clocks Are Not Free
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COMTRADE Sample Rate Generator
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Continual Self Calibration with Power System Time, Frequency and Phase Monitor Option 28
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GPS Antenna Mounting Bracket
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GPS Antenna Mounting Bracket Instructions
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GPS Antenna Preamplifier Installation Instructions
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IRIG Standard 200-04
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IRIG-B Specifications
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Internal Network Time Protocol (NTP) Server
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Internal Network Time Protocol (NTP) Server Espanol
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Option 32: Internal NTP Server Setup and Operation Guidelines
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Option 33: Dual Internal NTP Server Setup and Operation Guidelines
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Power System Time, Frequency and Phase Monitor
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Windows® Time Service Configuration
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Chassis Dimensions
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Clock Option Selection Guide
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Clock Selection Guide
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Model 1084A/B/C Option List Espanol
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Timing Products Options and Accessories
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Catalogo de Productos de Sincronizacion y Frecuencia
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