Amplitude 0.5 Vp-p to 6 Vp-p into 50 ohmsħ2-channel with concurrent dual-constellation receptionĩ5% at 60☌ for 5 cycles of 48 hours/cycleĮN6 (2002): Radiated Electric Field ImmunityĮlectromagnetic interference immunity (EMI)ĮN6 (2002): Voltage Fluctuations and Flicker in Low VoltageĮN6 (2001): Electrostatic Discharge ImmunityĮN6 (2004): Voltage Dip and Interrupt ImmunityĮN6 (2004): Electric Fast Transit Burst ImmunityĮN-60950-1:2006/A1:2010 Safety of Information Technology Equipment.
Output formats A, B, E (100 Hz, 1 KHz), G NASA36 IEEE 1344.
Holdover after 24 hours: 450 µs (TCXO) or 100 µs (OCXO).
Holdover after 4 hours: 12 µs (TCXO) or 3 µs (OCXO).
Accuracy: positive edge within ± 50 nsec of UTC when locked to a valid 1PPS input reference or GPS.
RS-485 differential input: -7 V to +12 V common mode voltage input range, 200 mVp-p differential voltage threshold.
Accepts IRIG (formats A, B, G), NASA36 and IEEE 1344 pulse width codes.
(both without CPS after 2 weeks of GNSS lock)ġ0-MHz sine wave (50 Ohm output impedance) OCXO (-GNSS option) for extended holdover accuracy
2 Hardware Trigger Outputs to control external Hardwareĭisciplined by and phased-locked to external timing input.
2 Edge Detection Inputs allowing a precise time stamping of external events.
Initial acquisition time of 26 s for cold start (GPS & GLONASS).
Supports GPS, QZSS, GLONASS and BeiDou.
72-channel receiver with concurrent dual-constellation reception.
Disciplined by and phased-locked to external timing input.
OCXO oscillator with with 5ns resolution.
User-selectable lead time to delay IRIG AM output.
The IRIG outputs accept IRIG (formats A, B, E, G), NASA36 and IEEE 1344.
The IRIG inputs accept IRIG (formats A, B, G), NASA36 and IEEE 1344.
Inputs and outputs for both IRIG DCLS and IRIG AM.
User-selectable lead time for the 1PPS output to delay model execution start.
OCXO holdover accuracy: 3 μs after 4 hours and 100 μs after 24 hours (IO821-GNSS).
Output accuracy: UTC ± 15ns for stationary conditions (IO821-GNSS only) and UTC ± 50ns for other conditions (locked to GPS or 1PPS source).
In addition, it can supply precision timing references to synchronize external hardware. The IO821 I/O module can be used to generate an interrupt which triggers the Simulink model execution at very precise intervals. For applications where accuracy during holdover is essential, an oven-controlled crystal oscillator (OCXO) is optionally available. Furthermore, the crystal oscillator provides uninterrupted precision timing even when all external sources become unavailable (referred to as holdover). This I/O module supports multiple timing inputs and, when the current timing input is lost, it switches automatically to the next lower-priority input. The precision timing reference uses an onboard oscillator with 5ns resolution that is phase-locked to an external timing reference input. The IO821 I/O module - with optional GNSS (GPS/GLONASS) receiver – provides precision timing and synchronization for real-time applications and includes both input and output interfaces to IRIG and 1PPS.