MODEL 721/721M LOW PASS FILTER
The Model 721 is a modular two-channel, rack mounted, lowpass filter each containing two independent signal channels. Each channel allows for one of five frequency cutoffs, or filter bypass, which is selected with a front panel rotary switch.
The Model 721M has all the features of the 721 with the addition of a switch-selectable gain of 1, 10, or 100.
Specifications
| Frequency: | Customer-specified -3dB frequencies from 0.3Hz to 30kHz for each of five positions per module, plus filter bypass Can have different frequencies per channel |
| Attenuation: | 48dB per octave (eight-pole filter) lower order (6 pole or 4 pole) available |
| Response: | Bessel response (linear phase) standard; Butterworth available |
| Gain: | 0dB ± 0.3dB in passband; Model 721M adds switch-selectable gain of 1, 10, or 100 |
| Signal range: | ±10V max. |
| Input impedance: | 100k ohms min. |
| Test points: | Front panel tipjack connections for output signal monitoring |
Rack Mounting
| Connections: | Rear panel mounted BNC connectors for input and output signals |
| Mechanical: | 19″W x 5.25″H x 16″D, eight module (16 channel) rack adapter Model 4015-109 |
| Rack: |
Modules plug into Model 4015-109 19″ rack with integral power supply  721-001 Rack |
| Input power: | 115VAC ±10% 50/60Hz, 20VA |
| Carrying case: | Two module (four channel) desktop case Model 4017-105 |