Stanford Research
Stanford Research SR645
Programmable Filter
9th Order Elliptic Lowpass Filter Filter Type
1 Hz to 1.9 MHz Cutoff Frequency Range
4 Digits Frequency Resolution
50 Ω or 1 MΩ Input Impedance
±5 V (1 MΩ), ±0.5 V (50 Ω) Maximum Input Voltage

| Attribute | Value |
|---|---|
| Filter Type | 9th Order Elliptic Lowpass Filter |
| Cutoff Frequency Range | 1 Hz to 1.9 MHz |
| Frequency Resolution | 4 Digits |
| Input Impedance | 50 Ω or 1 MΩ |
| Maximum Input Voltage | ±5 V (1 MΩ), ±0.5 V (50 Ω) |
| Passband Ripple | 0.1 dB |
| Stopband Attenuation | ≥ 60 dB |
| Output Impedance | 50 Ω |
| Power Requirements | 100/120/220/240 VAC, 50/60 Hz, 15 W |
| Interface | GPIB and RS-232 |
Stanford Research SR645 Options:
- SR645 - Option 01 - High current output
| Model | SR645 |
|---|
The Stanford Research SR640 is a Programmable Filter




