Stanford Research
Stanford Research SR625
1MHz - 2GHz Frequency Counter
1 Hz to 625 MHz Frequency Range
10 digits Frequency Resolution
50 Ω or 1 MΩ selectable Input Impedance
20 mVrms (DC to 100 MHz), 25 mVrms (100 MHz to 625 MHz) Sensitivity
±1 ppm/year aging rate (internal TCXO) Time Base Accuracy
| Attribute | Value |
|---|---|
| Frequency Range | 1 Hz to 625 MHz |
| Frequency Resolution | 10 digits |
| Input Impedance | 50 Ω or 1 MΩ selectable |
| Sensitivity | 20 mVrms (DC to 100 MHz), 25 mVrms (100 MHz to 625 MHz) |
| Time Base Accuracy | ±1 ppm/year aging rate (internal TCXO) |
| Gate Time | 1 ms to 1000 s |
| Maximum Input Voltage | 5 Vrms (AC coupled), ±5 V (DC coupled) |
| Display | 9-digit vacuum fluorescent display (VFD) |
| Interface | GPIB (IEEE-488) and RS-232 |
| Power Requirements | 100–240 VAC, 50/60 Hz, 15 W |
| Model | SR625 |
|---|
The Stanford Research Systems SR625 is a 1 MHz - 2.0 GHz Frequency Counter
