T770 Metrology-Grade Atomic Frequency Standard
Enhanced Grandmaster Clock (ePRTC)
The T770 is a metrology-grade rubidium atomic frequency standard, offering frequency stability, drift, and temperature coefficient up to 10 times better than ordinary rubidium clocks, and a one-day frequency stability comparable to that of a small cesium clock. It supports 1PPS and GNSS UTC synchronization, uses smooth frequency division to ensure a stable time base, and automatically maintains time in the event of a loss of lock. It features anti-interference algorithms and outputs multiple signals, including 10MHz, 5MHz, 1PPS, and Time of Departure (TOD). Options include 100MHz, 90MHz, and IRIG-B. Its 2U chassis makes it suitable for applications such as ePRTC master clocks, radar, communications, metrology, and aerospace measurement and control.
Enhanced Grandmaster Clock (ePRTC)
The T770 is a metrology-grade rubidium atomic frequency standard, offering frequency stability, drift, and temperature coefficient up to 10 times better than ordinary rubidium clocks, and a one-day frequency stability comparable to that of a small cesium clock. It supports 1PPS and GNSS UTC synchronization, uses smooth frequency division to ensure a stable time base, and automatically maintains time in the event of a loss of lock. It features anti-interference algorithms and outputs multiple signals, including 10MHz, 5MHz, 1PPS, and Time of Departure (TOD). Options include 100MHz, 90MHz, and IRIG-B. Its 2U chassis makes it suitable for applications such as ePRTC master clocks, radar, communications, metrology, and aerospace measurement and control.
Important Features
- Enhanced Grandmaster Clock (ePRTC)
- Very low environmental sensitivity, with a typical temperature coefficient of 2E-14/℃
- Automatically calibrate the rubidium clock frequency using GNSS
- Frequency stability 100000 seconds <4E-14
- 1s\10s stability 3E-13
- 5-channel 10MHz sinusoidal low-noise isolated amplifier output
- 5MHz and 100MHz sine wave channels
Important Features
| Test Item | Condition | Technical Indicators |
|---|---|---|
| Output frequency | 10MHz, 5 channels | BNC, sine wave 13±1dBm, 50Ω |
| Output frequency | 5MHz, 1 channel | Same as 10MHz specification |
| Phase noise | 1Hz | ≤ -113dBc/Hz |
| Phase noise | 10Hz | ≤ -143dBc/Hz |
| Phase noise | 100Hz | ≤ -155dBc/Hz |
| Phase noise | 1kHz | ≤ -157dBc/Hz |
| Phase noise | 10kHz | ≤ -160dBc/Hz |
| Phase noise | 100kHz | ≤ -160dBc/Hz |
| distortion | Harmonic | ≤ -40dBc |
| distortion | Non-harmonic | ≤ -80dBc |
| Frequency stability | 1s | Standard type: ≤5E-13, high performance type: ≤3E-13 |
| Frequency stability | 10s | Standard type: ≤5E-13, high performance type: ≤3E-13 |
| Frequency stability | 100s | Standard type: ≤1E-13, High performance type: ≤1E-13 |
| Frequency stability | 1000s | Standard type: ≤5E-14, high performance type: ≤4E-14 |
| Frequency stability | 10000s | Standard type: ≤5E-14, high performance type: ≤3E-14 |
| Frequency stability | 100000s | Standard type: ≤5E-14, high performance type: ≤4E-14 |
| Drift rate | /day | Standard type: ±3E-13, high performance type: ±1E-13 |
| temperature coefficient | /°C | Standard type: ≤1E-13, high performance type: ≤5E-14 |
| 1PPS output | 4-channel TTL, BNC | Pulse width 100ms, rising edge <10ns, jitter <1ns, GNSS synchronization |
| 1PPS input | 1 channel, TTL level | |
| IRIG-B output | Support (option) | |
| TOD Output | Support (option) | |
| Receiver type | 72 channels, supporting GPS/QZSS, GLONASS, BeiDou, Galileo, and SBAS | |
| Timing accuracy | 20ns | |
| Sensitivity | Tracking -166dBm, Cold Start -157dBm | |
| size | 2U, 447 x 89 x 300mm | |
| power supply | 220V±20%, 47Hz~63Hz | |
| Working temperature | Host | -10℃~+55℃ |
| Working temperature | Antenna | -40℃~+75℃ |
| Storage temperature | -45℃~+85℃ | |
| humidity | 95% non-condensing | |
| Power consumption | 100W | |
| Weight | 3.5kg |
Typical phase noise
Frequency stability typical value
产品型号一览表
| 特点参数 | T710 | T760 | T640 | T770 | TRA85 | TRS75 | TCA55 | TRM60 | CX5228 | CX910 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 外同步输入 | GNSS | ✓ | ✓ | ✓ | ✓ | — | — | — | — | — | — |
| 1PPS | ✓ | — | — | ✓ | ✓ | ✓ | ✓ | ✓ | — | — | |
| 10MHz | — | — | — | ✓ | — | — | — | — | — | — | |
| 频率输出 | 10MHz正弦波 | 8路 | 4路 | 4路 | 5路 | 1-way | 1-way | — | — | 1-way | 4路 |
| 10MHz方波 | 6路 | — | — | — | — | — | 1-way | 1-way | — | — | |
| 可选 | 1/5MHz | 100MHz | 100MHz | 5/100MHz | — | — | — | — | — | — | |
| — | NTP | IRIG-B | — | — | — | — | — | — | — | ||
| Stability | 1s | <3E-12 | <5E-12 | <3E-12 | ≤4E-13 | ≤ 3×10⁻¹² | ≤ 6×10⁻¹² | ≤ 8×10⁻¹¹ | ≤ 3×10⁻¹¹ | ≤ 1.5×10⁻¹³ | ≤ 1.1×10⁻¹³ |
| 10s | <3E-12 | <5E-12 | <3E-12 | ≤3E-13 | ≤ 1.5×10⁻¹² | ≤ 2×10⁻¹² | ≤ 2.5×10⁻¹¹ | ≤ 1×10⁻¹¹ | ≤2×10-¹³ | ≤2×10-¹³ | |
| 100s | <3E-13 | <5E-13 | <5E-12 | ≤7E-14 | ≤ 5×10⁻¹³ | ≤ 6×10⁻¹³ | ≤ 8×10⁻¹² | ≤ 3×10⁻¹² | ≤4×10⁻¹³ | ≤5×10-¹³ | |
| 日(GNSS锁定) | <1E-12 | <1E-12 | <1E-12 | ≤3E-14 | — | — | — | — | — | — | |
| Phase noise | 1Hz | ≤-95dBc/Hz | ≤-95dBc/Hz | ≤-100dBc/Hz | ≤-120dBc/Hz | ≤ -95dBc/Hz | ≤ -85dBc/Hz | ≤ -50dBc/Hz | ≤ -85dBc/Hz | ≤ -123 | -126* |
| 10Hz | ≤-130dBc/Hz | ≤-130dBc/Hz | ≤-130dBc/Hz | ≤-140dBc/Hz | ≤ -130dBc/Hz | ≤ -120dBc/Hz | ≤ -80dBc/Hz | ≤ -120dBc/Hz | ≤ -145 | ≤ -148 | |
| 100Hz | ≤-145dBc/Hz | ≤-145dBc/Hz | ≤-145dBc/Hz | ≤-155dBc/Hz | ≤ -150dBc/Hz | ≤ -145dBc/Hz | ≤ -115dBc/Hz | ≤ -140dBc/Hz | ≤ -155 | ≤ -155 | |
| 1kHz | ≤-155dBc/Hz | ≤-155dBc/Hz | ≤-160dBc/Hz | ≤-160dBc/Hz | ≤ -160dBc/Hz | ≤ -150dBc/Hz | ≤ -130dBc/Hz | ≤ -140dBc/Hz | ≤ -160 | ≤ -160 | |
| 10kHz | ≤-158dBc/Hz | ≤-158dBc/Hz | ≤-160dBc/Hz | ≤-160dBc/Hz | ≤ -160dBc/Hz | ≤ -155dBc/Hz | ≤ -140dBc/Hz | ≤ -145dBc/Hz | ≤ -165 | ≤ -163 | |
| distortion | Harmonic | ≤-45dBc | ≤-45dBc | ≤-45dBc | — | ≤ -30dBc | ≤ -30dBc | — | ≤ -80dBc | ≤ -40dBc | ≤ -40dBc |
| Non-harmonic | ≤-80dBc | ≤-80dBc | ≤-80dBc | — | ≤ -80dBc | ≤ -70dBc | — | — | ≤ -80dBc | ≤ -80dBc | |
| Pulse output | Number of way | 4 | 4 | 4 | 4 | 1 | 1 | 1 | 1 | — | — |
| Synchronization accuracy | 20ns | 20ns | 20ns | 10ns | — | — | — | — | — | — | |
| Frequency drift rate | /day | — | — | — | — | ±5×10⁻¹³ | ±1×10⁻¹² | ≤3×10-¹¹¹ | ±3×10⁻¹² | ≤3×10-¹⁰ | ≤1×10-¹⁰ |
| 物理电气特性 | Working temperature | -10℃~+55℃ | -10℃~+55℃ | -10℃~+55℃ | -10℃~+55℃ | -40℃~+65℃ | -40℃~+65℃ | -40℃~+85℃ | -40℃~+75℃ | -20℃~+70℃ | 0℃~+40℃ |
| 存健温度 | -45℃~+85℃ | -45℃~+85℃ | -45℃~+75℃ | -55℃-+85℃ | -40℃~+85℃ | -40℃~+85℃ | -55℃~+125℃ | -55℃~+100℃ | -40℃~+85℃ | -55℃~+125℃ | |
| power supply | 220V±20% | 220V±20% | 220V±20% | 220V±20% | +12V~+15V或+24V | +12V~+15V,±4% | +3.3V±5% | +5V±4% | +12VDC | +14~+125℃ | |
| Rate of work | 50W | 60W | 60W | 预热70W,稳态≤30W | 预热≤45W,稳态≤15W | 预热≤28.5W,稳态≤14.5W | 预热≤10W,稳态≤1.8W | 预热≤15W,稳态≤8W | ≤7.2W | ≤27W | |
| External Dimension | 2U半宽 | 2U | 2U | 2U | 116mm×79mm×38mm | 68mm×68mm×18mm | 41mm×36mm×17mm | 51mm×51mm×18mm | 50mm×50mm×19mm | 5inch×3inch×3inch | |
| Weight | 2Kg | 5Kg | 3.5Kg | 5kg | ≤500g | ≤300g | ≤50g | <100g | — | — | |
| 驯服及守时 | After 24h of synchronization | 200ns | 200ns | 10us | 30ns(同步20d后) | 同步24h后≤1us | ≤1us | — | ≤1us | — | — |
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