Model 1093B/C GPS Satellite-Controlled Clock (500 ns)

Model 1093B/C GPS Satellite-Controlled Clock (500 ns)

An Arbiter Systems® best seller, Model 1093B/C provides accuracy, flexibility and economy to meet a broad range of industry applications.

Model 1092A/B/C/1093A/B/C User Manual
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Model 1092A/B/C/1093A/B/C User Manual Español
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Model 1093B/C Quick Setup Guide
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Model 1093B/C Quick Setup Guide Español
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Model 1093B/C Data Sheet
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Model 1093B/C Data Sheet Español
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GPS Antenna Data Sheet
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Model 1093B/C delivers better than 500 ns accuracy and includes the most highly sought after features in a precision time clock as standard.

With two terminal strip outputs providing unmodulated IRIG-B and 1 PPS signals, the 1093 is capable of driving multiple loads in parallel. An optional modulated IRIG-B port is available adding greater flexibility.

Like other Arbiter clock models, various options are available to add features such as NTP (Network Time Protocol) support, four additional configurable outputs, high drive IRIG-B outputs, power system time, frequency, and Phase Monitor functions, one Form C (SPDT) fail-safe, LOCKED relay that is compatible with 129 Vdc digital fault recorder inputs; plus many more.

Versions B/C offer various interface options (see photos and Key Features tab). Each product includes the GPS antenna and cable, an appropriate power inlet and power cord, a rack mount kit and an operations manual, all backed by a Limited Lifetime Warranty to the original owner/purchaser.

Model 1093B/C is available with two front panel configurations. See photos and Key Features tab for more information.

Accéder au résumé en français Modele 1093 en français 

  • Accuracy < ± 500 ns typical
  • Unmodulated IRIG-B and 1 PPS included, modulated IRIG-B optional
  • Options include an internal NTP server, High Drive IRIG-B outputs, One Form C (SPDT) fail-safe locked relay, and Power System Time, Frequency and Phase Monitor

Versions B/C offer various interface options (see photos):

  • 1093B adds to the LEDs an LCD display and keypad, providing easy access to setup and system status information.
  • 1093C includes both the operating status LEDs, the LCD display and keypad, and includes a large LED time display.
  • IEEE C37.118.1-2005 compliant for Synchrophasor use.

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

± 500 ns peak

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.


  • 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 now included in the Model 1093s. This feature improves acquisition time to as little as 15 seconds after a brief power loss by supplying constant power to the real-time clock and RAM in the GPS receiver module.

I/O Configuration

Output Connectors

Two standard: one IRIG-B Unmodulated and one 1 PPS; Type: bus driver, 5 V CMOS; 10 ohms source impedance; ± 75 mA drive capability; pluggable terminal strip.
Open-drain FET drivers (400 V, 220 mA, 1 W power dissipation) can also be fitted; contact tech support.

Event Inputs

One event timer channel with 1 µs resolution is standard. This function may be driven by the start bit of a received character on the serial port, or (by internal connection) an external 5 V CMOS/TTL signal at one of the terminal strip connectors.

Programmable Pulse Output

One programmable output pulse (by a jumper connection) that may be output on a terminal strip connector or the AUX OUT pin on either RS-232 Port.
Four modes:

  • Every 1 second 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 seconds to 600 seconds, except in one-shot mode, where the output is Low prior to the specified time and High thereafter.



  • Status LEDs (Models 1093B/C)
  • 2 character x 20 character supertwist LCD (Model 1093B/C)
  • 14 mm (0.56 in) LED; 9 digits (Model 1093C)
  • Time: UTC or local
  • Position: latitude, longitude, altitude
  • Receiver and clock status
  • 1 PPS (input) deviation
  • Event time
Status LEDs
  • Operate (green)
  • Unlocked (red)

Eight keys; select display functions or setup menus (Model 1093B/C)

  • Local time offset
  • Output code select: Local/UTC
  • Daylight Saving Time (Set Summer Time): Off/On/Auto USA/Auto EUR/Auto CUS
  • Backlight control: On/Off/Auto
  • Event input: Event/1 PPS
  • Programmable Pulse setup
  • Antenna delay
  • Out of lock time: 1 minute to 99 minutes, Off, or Zero Delay
  • Auto-Survey: On/Off, Survey duration
  • Position Hold: On/Off, Position Auto/Manual
  • Option Configuration and Setup
  • Serial port: RS-232



1200 baud to 19,200 baud; 7 or 8 data bits; 1 or 2 stop bits; even/odd/no parity

Second RS-232 port available (1093opt19)
Connector: Male 9-pin D-sub (TXD, RXD)


Optional driver can also be fitted (1093opt94)

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

Male 9-pin D-sub (TXD, RXD, AUX IN, AUX OUT)

AUX OUT can provide programmable pulse function at RS-232 levels

Power Requirements



(Option 07) 85 Vac to 264 Vac, 47 Hz to 440 Hz, 20 VA maximum or 110 Vdc to 370 Vdc, 15 W maximum


(Option 07) 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.




1 RU rack mount or tabletop, 260 mm deep FMS, Rack mounts included.
635 mm x 381 mm x 229 mm (25 in x 15 in x 9 in), shipping


2 kg (4.5 lbs), net
5.5 kg (12 lbs), shipping


Cable Connection: F-type
Size: 80 mm hex (across flats) x 84 mm tall (3.2 in x 3.3 in), including connector
Weight: 170 g (6 oz)

Antenna Cable

Type: RG-6, 15 m (50 ft) provided
Weight: 0.69 kg (1.52 lbs) per 15 m

Antenna Mounting

0.75 in pipe (1 in - 14 marine) thread



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




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 mark/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.

1093opt19 Second RS-232 Port
1093opt20A Four Configurable Fiber-Optic Outputs
1093opt27 8-Channel High Drive IRIG-B Output
1093opt28 Power System Time, Frequency, and Phase Monitor
1093opt29 Four Additional Outputs with Dry Contact and + 25/50 Vdc
1093opt34 Network Time Protocol (NTP) / Precision Time Protocol (PTP) Server
1093opt36 Four Configurable Outputs
1093opt92 1 IRIG-B Modulated Output
1093opt93 1 Out-of-lock Relay 1 Form C SPDT
1093opt94 1 RS-422/485 Driver
1093opt95 Four BNC Connectors, (Parallel to Pluggable Terminal Strip)
1093opt96 1 1 PPS Output Reconfigured to Programmable Pulse
1093opt97 1 IRIG-B Output Reconfigured to Programmable Pulse
1093opt98 1 1 PPS Output Reconfigured to Event Input
1093opt01 LCD Backlight
1093opt04 On/Off Switch (1084B/1093B)
1093opt07 IEC-320 Power Inlet 85 Vac to 264 Vac RMS, 110 Vdc to 370 Vdc
1093opt08 10 Vdc to 60 Vdc Terminal Power Strip and Surge Withstand
1093opt10 85 Vac to 250 Vac RMS, 110 Vdc to 350 Vdc Terminal Power Strip and Surge Withstand

1 May be ordered independently from other I/O options

AS0028200 19 Inch Rack Mount Kit
AS0087800 Arbiter GPS Active Timing Antenna
CA0021315 1 15 m (50 ft) RG-6 Antenna Cable
P01 - P10 2 Country specific power cord with straight female end
PD0052700 Quick Setup Guide (1093)
AP0003400 3 BNC (Male) Breakout to 100 mm Wires
AP0007700 4 Modular DB-9 to RJ-11 Adapter, Preconfigured
AP0008900 3 BNC (Female) Breakout to 100 mm Wires
AP0013400 GPS Antenna Cable Splitter, F-Type, 950-2150 MHz, One Port Pass DC
AP0014900 3 BNC (Female) Breakout to Screw Terminal
AP0015000 3 BNC (Male) Breakout to Screw Terminal
AS0033100 Rack Slide Kit
AS0035400 Operation Manual (1092/1093)
AS0044600 Antenna Mounting Kit
AS0044700 5 21 dB In-Line Pre-amplifier
AS0048900 Antenna Grounding Block Kit
AS0056600 24 Inch Rack Mount Kit
AS0067200 4 Programming Port Cable with adapter
AS0094500 GNSS Surge Protector
CA0019806 RS-232 Null Modem Cable, DB9F-DB9F, 2 m (6 ft) length
CA0021302 1 2 m (6 ft) RG-6 Antenna Cable
CA0021306 1 6 m (20 ft) RG-6 Antenna Cable
CA0021330 1 30 m (100 ft) RG-6 Antenna Cable
CA0021345 1 45 m (150 ft) RG-6 Antenna Cable
CA0021360 1 60 m (200 ft) RG-6 Antenna Cable
CA0021375 1 75 m (250 ft) RG-6 Antenna Cable
CA0022500 6 Option 28 System Frequency Reference Cable, 6 m (20 ft)
CA0023600 4 RJ-11 Cable Four-Pin Crossed, 2 m (7 ft)
CN0027700 Type F, Male, RG-6 Antenna Cable Crimp-on Connector
CN0027800 Type F, Male, RG-11 Antenna Cable Crimp-on Connector
CN0031400 Type F, Male, RG-6 Plenum Rated Antenna Cable Crimp-on Connector
TF0006000 Type F, RG-11 Antenna Cable Crimp Tool
TF0006400 Type F, RG-6 Antenna Cable Crimp Tool
TF0013200 Antenna Cable Stripping Tool, RG-6
TF0013300 Antenna Cable Stripping Tool, RG-11
WC0004900 1 300 m (1000 ft) Roll RG-11 Cable
WC0005000 1 300 m (1000 ft) Roll RG-6 Cable
WC0005200 1 300 m (1000 ft) Roll RG-6 Plenum Rated Cable

1 Stocked length. Custom lengths available from 0.3 m (1 ft) to 300 m (1000 ft). Contact factory.
2 Only applies if Power Option 07 is ordered
3 Converts pair of wires to BNC.
4 Used with retired options: Option 32 or Option 33.
5 Used for cable lengths greater than: RG-6 75 m (250 ft) ; RG-11 120 m (400 ft)
6 Used with Option 28.

Click to Download Latest Version of Software
Arbiter Time Service_01Jan2010_1500 PC Clock Synchronization Service for WIN NT/2000/XP/Vista/7. Not compatible with WIN 8.
Tera Term_01Jan2010_23 This is a very good HyperTerminal replacement. Able to capture data from Models 930A and 931A. Also able to program the GPS Satellite Controlled Clocks via serial commands.
TimeRC_3.0 NTP Server Test Utility. Screen Capture Utility.


Software Version and Related Information

Arbiter Time Service Tool (Arbiter Time Service)

PC Clock Synchronization Service for WIN NT/2000/XP/Vista/7. Not compatible with WIN 8. The Arbiter Time Service installs on Microsoft® Windows NT/2000/XP and runs as a service to keep the PC clock synchronized to an Arbiter GPS clock. The Arbiter Time Service connects with an RS-232 cable and interrogates the clock for the time signal

VersionRev LevelVersion Notes

Terminal Emulation Program (Tera Term)

Free software terminal emulator (communications program) for Microsoft Windows.

  • Tera Term (Pro) is a free software terminal emulator (communication program) for MS-Windows.
  • Supports VT100 emulation, telnet connection, serial port connection, etc.
  • Compatible with Windows 98, Windows NT, Windows 2000, Windows XP, Vista, Windows 7


Used as a test tool for NTP servers, synchronizes computer time over a network. Also used to save screen captures from the Model 930A, Model 931A, and Model 933A.

VersionRev LevelVersion Notes
Firmware Information (EPROM based firmware is not available for download)
1092/1093_Firmware_21Mar2017 Requires an EPROM update from Arbiter.
NTP/PTP Firmware_2.08_update-00.09 Downloadable. UNZIP, read instructions, and use the web/SSH interface to import apf file(s) into unit.
Power System Time, Frequency, and Phase Monitor Firmware_05Apr2012 Requires an EPROM update from Arbiter.


Firmware Version and Related Information

EPROM update (1092/1093_Firmware)

VersionRev LevelVersion Notes

Updates are not security related.

  1. Fixed serial output menu to correctly integrate settings for the Option 28 Power System Time, Frequency, and Phase Monitor.

Updates are not security related.

  1. Fix leap second operation to properly warn and implement the leap second.
  2. Changed the IRIG-B Daylight Saving Time (DST) pending bit to change state at xx:59:01 (was starting at xx:59:00). Now it is consistent with Leap Second Pending bit operation.
  3. Fixed the IRIG-B Daylight Saving Time (DST) pending bit to properly change state when exiting DST.
  1. Baseline code alignment with other legacy clock models. Does not affect clock operation at the outputs (BZ734).
  1. DST stop error. Not exiting DST mode properly when "day of week" value matches the first day of the following month (BZ733). Example: DST will not properly stop if DST stop was set to Last Sunday of October and November 1 is also on a Sunday.
  2. Add Option 36 as a Slot B selection.
  3. B8 broadcast output was missing a colon.

Option 34 and Option 35 updates:

  1. PTP enable/disable now shows on front panel display.
  2. Enabled leap second flags, leap second application time (seconds of year), and UTC-GPS seconds offset.
  3. Fixed formatting related to the version strings.
  1. Update to the time quality functionality so it no longer displays locked, maximum accuracy immediately after reacquiring satellites.
  1. Fix IP address display to use periods (.) instead of colons (:).
  1. Add Option 34/35 support.
  2. Add "IP" serial command to return Option 34/35 IP addresses.
  3. Add display of Option 34/35 MAC addresses
  4. Add bit to indicate if unit has ever been locked to GPS.
  5. Update NTP status screens.
  1. Update serial "RD" output to be consistent across all clocks (reference BZ 489).
  2. Fix Option 28 XI configuration command (reference BZ 490).
  3. Leap second pending always 0 for Motorola 8-channel receiver (reference BZ 632).
  4. Fix 1093 Optional RS232 port periodically responded with "garbage" data (reference BZ 635).
  1. Fix power-up set defaults: Incorrectly had to wait until "SETUP" key released.
  2. Possible survey fix: "Zero" positions will now be ignored when doing survey calculation.
  3. Complete "Position Hold ID" (user or survey position flag)
  4. Block user from changing user position or position hold setting while survey active.
  5. Broadcast format time moved from the 20ms mark to 100ms mark. It was moved to give Option-28 enough time to format broadcast messages. (Opt-28 broadcast data was being copied while it was still being update causing some "0x00" characters to randomly appear in the message)
  6. DEBUG CODE: Output lat-long dif when debug_mode broadcast set to mode 2.

Downloadable Firmware (NTP/PTP Firmware)

The zip file contains all files and PDF instructions necessary to update the Network Time Protocol (NTP) / Precision Time Protocol (PTP) firmware. Reminder: Unzip the downloaded file to access the PDF instructions and individual update files.

VersionRev LevelVersion Notes

Updates are not security related.

1. Updates CLOI to 1.11. The new CLOI reduces the load on the option board CPU which allows it to serve more PTP clients.

Support  > Version
Core: 2.4
Auth01: 2.2
TPS UI Content: 2.2
Startup App: 1.3
System Monitor: 1.5
CLOI: 1.11

Reminder: Unzip the downloaded file to access the PDF instructions and individual apf update files.


Updates are not security related.

1. Updates sys_monitor-01.05. The new sys_monitor corrects a bug in the frequency tuning algorithm that results in high system time offsets on some units. Whether or not a system is susceptible to this bug depends on the initial frequency of the on-board oscillator prior to tuning. It is likely that a system showing low offset now will continue to work. However, to be safe, the update is recommended.

Support  > Version
Core: 2.4
Auth01: 2.2
TPS UI Content: 2.2
Startup App: 1.3
System Monitor: 1.5
CLOI: 1.10

Reminder: Unzip the downloaded file to access the PDF instructions and individual apf update files.



  1. Update NTP to latest release (4.2.8p8) to protect against a known vulnerability.
  2. Modified the NTP server configuration to allow correct responses to queries at a rate higher than once every 4 seconds.
  3. Fixed a bug that prevents the proper network filter configuration for vlan interfaces resulting in vlans not functioning.
  4. Fixed a bug preventing getting the OS version from the serial port
  5. Improved robustness of the update process.

EPROM Update (Power System Time, Frequency, and Phase Monitor Firmware)

VersionRev LevelVersion Notes
  1. The frequency was unstable off nominal frequency with an error proportional to frequency deviation. Fixed a conversion factor in the calculation. (BZ 692)
  1. Improved compatibility during transfer of correction values to option 28.

GPS Substation Clock Requirements
Download gps_substation_clock_requirements.pdf (25 kB) »

IRIG-B Time Code Accuracy, IED and System Design Issues
Download irig_accuracy_and_connection_requirements.pdf (31 kB) »

NERC PRC-08 Compliance Statement
Download pd0042900a_NERC_PRC-018_compliance_statement.pdf (75 kB) »

Time in the Power Industry: How and Why We Use It
Download TimeInThePowerIndustry.pdf (407 kB) »

Why GPS Clocks Are Not Free
Download why_gps_clocks_arent_free.pdf (12 kB) »

Continual Self Calibration with Power System Time, Frequency and Phase Monitor Option 28
Download power_system_time_freq_phase_monitor_continually_cal.pdf (12 kB) »

GPS Antenna Mounting Bracket
Download antenna_mnt_bracket_brief.pdf (462 kB) »

GPS Antenna Mounting Bracket Instructions
Download pd0024700_gps_antenna_mounting_bracket.pdf (580 kB) »

GNSS Antenna Preamplifier Installation Instructions
Download pd0025300_gnss_antenna_preamplifier.pdf (3 MB) »

IRIG Standard 200-16
Download irig-b_200-16.pdf (857 kB) »

IRIG-B Specifications
Download irig_b_spec_brief.pdf (488 kB) »

Internal Network Time Protocol (NTP) Server -DISCONTINUED-
Download ntp.pdf (22 kB) »

Internal Network Time Protocol (NTP) Server Español -DISCONTINUED-
Download ntp_option32_espanol.pdf (129 kB) »

Option 32: Internal NTP Server Setup and Operation Guidelines -DISCONTINUED-
Download ntp_option32_english.pdf (279 kB) »

Option 33: Dual Internal NTP Server Setup and Operation Guidelines -DISCONTINUED-
Download ntp_option33_english.pdf (301 kB) »

Option 34: Network Time Protocol (NTP)/Precision Time Protocol (PTP) Server Data Sheet
Download Option34_NTP_PTP.pdf (22 kB) »

Power System Time, Frequency and Phase Monitor
Download power_system_time_freq_phase_monitor.pdf (152 kB) »

Windows® Time Service Configuration
Download w32time.pdf (14 kB) »

Arbiter Time Service Installation Instructions
Download pd0041300_ArbiterTimeServiceInstall.pdf (382 kB) »

Chassis Dimensions
Download chassis.pdf (27 kB) »

Clock Option Selection Guide
Download clock_option_selection_guide.pdf (98 kB) »

Clock Selection Guide
Download clock_selection_guide.pdf (120 kB) »

Model 1093 Option List Español
Download 1093_optionlist_espanol.pdf (678 kB) »

Timing Products Options and Accessories
Download timing_and_frequency_options.pdf (36 kB) »

Model 1092-93A/B/C Firmware Upgrade Instructions
Download 1093_DST_ROM_instructions.pdf (679 kB) »

Option 28 Firmware Upgrade Instructions
Download Option28_DST_ROM_instructions.pdf (154 B) »

GPS Surge Protector Installation Instructions
Download pd0045800_surge_protector_installation_instructions.pdf (80 kB) »

Timing Signals, IRIG-B and Pulses
Download pd0043200_timing_signals_overview.pdf (197 kB) »

Catalogo de Productos de Sincronizacion y Frecuencia
Download catalogo_de_productos_de_sincronizacion_y_frecuencia.pdf (216 kB) »

Press Release: Leap Second Anomaly December 2016
Download PD0054900_LeapSecondPressRelease.pdf (70 kB) »

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