Stanford Research
Stanford Research SR620
Time interval and frequency counter
DC to 1.3 GHz (standard), DC to 2.6 GHz (option) Frequency Range
25 ps single-shot resolution Time Interval Resolution
±(25 ps + 1 ppm of reading) Time Interval Accuracy
11 digits per second Frequency Resolution
2 independent input channels (A and B) plus external reference input Input Channels
| Attribute | Value |
|---|---|
| Frequency Range | DC to 1.3 GHz (standard), DC to 2.6 GHz (option) |
| Time Interval Resolution | 25 ps single-shot resolution |
| Time Interval Accuracy | ±(25 ps + 1 ppm of reading) |
| Frequency Resolution | 11 digits per second |
| Input Channels | 2 independent input channels (A and B) plus external reference input |
| Input Impedance | 50 Ω or 1 MΩ selectable |
| Trigger Level Range | -5 V to +5 V, adjustable in 1 mV steps |
| Timebase | Internal OCXO timebase with ±1 ppm/year aging rate; external 1, 5, or 10 MHz reference accepted |
| Measurement Modes | Frequency, period, time interval, rise/fall time, phase, duty cycle, totalize, and pulse width |
| Interface | GPIB (IEEE-488) and RS-232 standard interfaces |
Stanford Research SR620 Options:
- SR620 - Option 01 - 2 ppb OCXO timebase
| Model | SR620 |
|---|
The SR620 measures time interval, frequency, pulse-width, rise and fall time, period, phase and events. Time intervals are measured with 25 ps rms resolution, making the SR620 one of the highest resolution counters available.
