Model 1088B GPS Satellite Clock (40ns)

Setting the standard by which other precision time clocks are measured, Model 1088B features unprecedented accuracy, maximum flexibility and proven reliability.

Model 1088B User Manual
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Model 1088B User Manual Espanol
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Model 1088B Data Sheet
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Leading the precision time clock industry, Arbiter's top-of-the-line Model 1088B offers unprecedented accuracy, flexibility, and reliability for applications in precision timing.

Model 1088B delivers GPS timing accuracy of 100 ns rms from UTC/USNO. Typical performance is less than 40 ns RMS. Need complete resistance to loss of GPS synchronization? The 1088B supports an interconnection to a second 1088B providing fail-safe redundancy.

If your application demands maximum versatility, look no further than the 1088B. Standard input/output (I/O) capabilities provide over 260,000 possible configurations, with 22 available signals. Featuring a second option board slot found only on the 1088B, the number of configurable options grows even further. Options include 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.

Key Features
Specifications
Options
Accessories
Related Resources

More configuration options than any other clock
Highest accuracy, <40 ns RMS typical; <100 ns worst case
Four user configurable BNC connectors supporting multiple output functions including IRIG-B modulated, 1 PPS, Programmable Pulse, IRIG-B Modified Manchester (IEEE 1344) and more.
Fiber Optic support
NTP compatible
Two Form C (SPDT) fail-safe relays, locked and jumper selectable
Two Event Inputs (Channel A and B) included

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	UTC/USNO +-50 ns rms, when receiving 4 or more satellites and Position-Hold Mode on UTC/USNO +-100 ns rms, receiving a single satellite and Position-Hold Mode on UTC/USNO +-200 ns rms, when receiving 4 or more satellites and Position-Hold Mode off

Synchronization

CMOS output signals are synchronized to the 1 PPS output, +-50 ns, maximum.
IRIG-B modulated, +-1 us, 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 the Model 1088B. This feature improves acquisition time by supplying constant power to the real-time clock and RAM in the GPS receiver module.

I/O Configuration

Output Connectors

Four, BNC, user-configurable. Each connector is configurable as a specific input function or as any one of 22 output functions, listed below, by means of internal, push-on jumpers. Each output connector is independently buffered. Configuration is easily changed in the field. Refer to the options section for more outputs.
Analog outputs are op-amp (LF353) followers with 560-ohm protective resistors.
CMOS outputs are buffer type (74HC126) with 47-ohm source resistors.

Output Signals

Analog:

IRIG-B, 1 kHz modulated, 10 Vp-p
1 PPS deviation; ±5 V at 10 µs/V

5 V CMOS:

IRIG-B, E, D, or H, level-shift
1 PPS, 1 PPM, 1 PPH
1, 10, 50, 60, or 100 PPS
1k, 10k, or 100k PPS
1M, 5M, or 10M PPS
Locked
Programmable Pulse
IRIG-B Modified Manchester (IEEE Standard 1344)

Event Inputs

Two inputs are available, each having a 100 ns timing resolution. Each input may be configured to accept an external 1 PPS signal, and measure the deviation from 1 PPS/GPS or to record up to 300 sequential events (separated by 11 ms). Event data is logged in battery-backed RAM and may be read or cleared from the front panel or RS-232 interface.

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.

Input Functions

Channel A	Event or 1 PPS: 5 V TTL/CMOS level
Channel B	Event or 1 PPS: 5 V TTL/CMOS level
Freq. Reference	5 V TTL/CMOS or AC-coupled; 100 kHz, 1 Mhz, 5 MHz, or 10 MHz

Interface

Operator

Display	2 x 20 character supertwist LCD
Functions	Time: UTC or local Position: latitude, longitude, altitude Receiver and clock status 1 PPS (input) deviation Event time
Status LEDs	Operate (green) On Line (green) Unlocked (red) Fault (red) In addition, when Option 10 (Clock Backup Battery) is ordered: Battery Charge (green) Battery in Use (green) Battery Low (red)
Keyboard	Eight keys
Setup	Local time offset Output code select: Local/UTC Daylight Saving Time: On/Off/Automatic Backlight control: On/Off/Automatic Event input: Event/1 PPS, for each input A and B Programmable Pulse setup Antenna delay Clock offset Out-of-Lock time: 1 to 99 minutes, Off, or Zero Delay Auto-Survey: On/Off, Survey duration Position Hold: On/Off, Position Auto/Manual Option Configuration and Setup Recorder output A/B Frequency Reference: standard (internal) or external Serial port: RS-232

System

Includes first serial port, second RS-232 port available (1088opt17A)

RS-232	1200 to 19,200 baud; 7 or 8 data bits; 1 or 2 stop bits; even/odd/no parity
Broadcast modes	Standard ASCII (IRIG-J) Extended ASCII ASCII with Time Quality ASCII with Time Quality and Year Vorne large-display time Status/Alarm Event data
Connector	Male 9-pin D-sub (TXD, RXD)

Power Requirements

Standard

Voltage	85 to 264 Vac, 47 to 440 Hz, 20 VA maximum or 110 to 370 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. 508 x 381 x 203 mm (20 x 15 x 8 in.), shipping
Weight	2 kg (4.5 lbs), net 5.5 kg (12 lbs), shipping
Antenna	0.75 in. pipe (1 in. - 14 marine) thread Cable Connection: F-type Size: 77.5 dia. x 66.2 mm (3.05 x 2.61 in.) Weight: 170 grams (6.0 oz)
Antenna Cable	RG-6 type 15 m (50 ft) provided Weight: 0.69 kg (1.52 lbs) per 15 m

Environmental

Temperature	Operating: 0° to +50° C (-20° to +70° C typical) Nonoperating: -40° to +75° C
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.

There are two internal option slots in the Model 1088B and options fit into two categories: those that require internal option slot space, and those that do not. Only one option may occupy the individual Option Slots. Available options are listed below and described in the Options and Accessories section.

I/O
1088opt03 ¹	Four Additional Configurable Outputs
1088opt04 ²	Parallel BCD Output, 1 ms Resolution (1088B)
1088opt17 ²	Parallel BCD with Second RS-232 Port
1088opt17A ²	Second RS-232 Port (1088B)
1088opt18 ²	Self-Monitor, IRIG-B Distribution System and Redundant Control with Second RS-232 Port
1088opt19 ²	Out-of-lock Relay 1 Form C SPDT [1088B]
1088opt20A ³	Four Configurable Fiber-Optic Outputs
1088opt23 ³	COMTRADE Sample Rate Generator
1088opt27 ²	8-Channel High Drive IRIG-B Output
1088opt28 ¹	Power System Time, Frequency and Phase Monitor
1088opt29 ²	Four Additional Outputs with Dry Contact and +25/50 Vdc
1088opt32 ²	Internal Network Time Protocol (NTP) Server
1088opt33 ²	Dual Internal Network Time Protocol (NTP) Server
General
1088opt01	LCD Backlight
Power (select only one)
1088opt07	85 to 264 Vac RMS, 110 to 370 Vdc Terminal Power Strip (1088B)
1088opt08	10 to 60 Vdc Terminal Power Strip and Surge Withstand (1088B)
1088opt15A	110 to 170 Vdc Terminal Power Strip and Surge Withstand (1088B)
1088opt15B	110 to 300 Vdc Terminal Power Strip and Surge Withstand (1088B)
Oscillator
1088opt12 ¹	Oven-Controlled Crystal Oscillator and Four Additional Outputs

¹ Uses Option Slot A
² Uses Option Slot B
³ Uses Option Slot A or B

All Arbiter products are shipped with standard accessories as described on each product page. Additional accessories may also be ordered during the initial sale or afterward. Contact Arbiter technical support for additional information.

Included
AS0028200	Rack Mount Kit
AS0029900	Operation Manual (1088)
AS0087800	Arbiter Universal GPS Antenna
CA0021315	15 m (50 ft) RG-6 Antenna Cable
Available
AS0033100	Rack Slide Kit
AS0044600	GPS Antenna Mounting Kit
AS0044700 ¹	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
P01-P10	Country specific power cord with straight female end Country specific plug and power cord cable with straight female end.
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 Used for cable length greater than 75m (250ft)

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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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App Note 102: Synchronizing End-to End Relay Testing with Model 1088B
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App Note 103: Large Format Displays with Arbiter products
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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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Model 1088B Option 18: IRIG-B Distribution Bus, Fault Monitor, and Second RS-232
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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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Self-Monitor, IRIG-B Distribution System and Second RS-232
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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 1088B 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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