8040C Symmetricom Standard Used

Electrical Specifications

Frequency outputs

• Frequency: 1, 5 & 10MHz
• Format: Sinewave
• Amplitude: 1Vrms
• Harmonic: <-40dBc
• Non-harmonic: <-60dBc
• Connector: BNC
• Load impedance: 50Ω
• Location: rear panel

• Frequency: 1,5 & 10MHz
• Format: TTL
• Amplitude: >3V Peak
• Pulse width: 50% duty cycle
• Connector: BNC
• Load impedance: 50Ω
• Location: rear panel

Timing outputs

• Format: 1PPS
• Amplitude: >3V
• Pulse width: 400ns
• Rise time: <20nS
• Jitter: <10pS RMS
• Connector: BNC
• Load impedance: 50Ω
• Location: rear panel

Timing inputs

• Sync input: 1PPS
• Amplitude: TTL compatible
• Connector: BNC
• Load impedance: 50Ω
• Location: rear panel

Performance Parameters

• Accuracy at shipment: <±5E-11
• Retrace: <±5E-11
• On-off-on: 24h, 24h, 24h @ 25°C
• Control range: ±1E-6 with 1E-12 resolution

Warm-up time

• Time to lock: <5 minutes
• Time to <1E-9: <8 minutes

GPS Disciplining

• Time for valid output: <20 minutes
• Frequency accuracy: <1E-12

Stability

• Avg. Time (s): 1; Allan Deviation: <3.0E-11
• Avg. Time (s): 10; Allan Deviation: <1.0E-11
• Avg. Time (s): 100; Allan Deviation: <3.0E-12

SSB phase noise

• Offset (Hz): 10MHz
• 1: -72dBc
• 10: -95dBc
• 100: -130dBc
• 1,000: -140dBc
• 10,000: -148dBc

Remote system interface & control RS-232-C (DTE configuration)

Connector

• RS-232: 9-pin male; rectangular D
• Location: rear panel
• Protocol: 8 data bits; 1 stop bit
• Baud rate: 57600

Environmental & Physical Specifications

General environment (operating)

• Temperature: 0°C to 50°C
• Temperature coefficient: <3E-10
• Storage temperature: -40°C to 70°C
• Humidity: 95% up to 50°C
• Magnetic field: DC (±2 Gauss)
• Magnetic sensitivity: <4E-11/Gauss
• Altitude (operating): 0 to 50,000 feet

AC power requirements

• 90 to 240 VAC
• 47 to 63 Hz
• 25W (operating)
• 45W (warm-up)

Dimensions

• 19” W x 1.75” H x 12” D

Today’s precision test equipment requires a stable reference to make accurate frequency measurements. The equipment used varies depending on stability, accuracy and output signal format. All of these parameters can lead to a multitude of configurations, platforms and products that can be expensive to implement and maintain.

The Symmetricom 8040C solves this problem by providing a stable and accurate frequency reference with multiple output signal formats in an easy to install 1U rack-mountable chassis.

Unlike other units, the 8040C offers configurable RF outputs, GPS disciplining and a RS-232 interface for command and control.

The 8040C has six outputs, each of which can be user configured to provide a 1, 5 or 10MHz sine or square wave or 1PPS output. The standard configuration for the 8040C has three 10MHz, one 5MHz, one 1MHz and one 1PPS output.

A 1PPS input allows the 8040C to be disciplined by a GPS receiver for improved frequency accuracy and long-term stability. The 8040C auto adaptive algorithm allows plug and play connectivity for easy GPS disciplining. 

The 8040C is field configurable, allowing the instrument to support changing functionality in evolving systems.

The 8040C is designed around Symmetricom’s award winning SA.22C rubidium oscillator, which is deployed worldwide as the reference oscillator in wireless base stations.