The Keysight (Agilent/HP) 355C is a high-precision manual step attenuator designed for operation from DC to 1000 MHz (1 GHz). Utilizing cam-actuated microswitches to insert and remove attenuator sections, this compact and rugged unit maintains short lead lengths to minimize stray capacitances, inductances, and phase shifts. It provides reliable attenuation from 0 to 12 dB in 1 dB steps and can be cascaded in series with the 355D to extend the range up to 132 dB.
Specifications
Physical
| Parameter | Value |
|---|---|
| Dimensions (W×H×D) | 54 mm × 67 mm × 152 mm |
| Weight | 0.68 kg |
RF & Electrical Specifications
| Parameter | Value |
|---|---|
| Frequency Range | DC to 1 GHz |
| Attenuation Range | 0 to 12 dB |
| Attenuation Steps | 1 dB steps |
| Nominal Impedance | 50 ohms |
| Maximum SWR (DC to 250 MHz) | 1.2 |
| Maximum SWR (250 to 500 MHz) | 1.3 |
| Maximum SWR (500 MHz to 1 GHz) | 1.5 |
| Maximum Insertion Loss at 0 dB | 0.2 dB + 2.3 dB/GHz |
| Maximum Average Input Power | 0.5 W |
| Maximum Peak Input Power | 350 W |
| Overall Accuracy (DC to 500 MHz) | ±0.25 dB |
| Overall Accuracy (DC to 1000 MHz) | ±0.35 dB |
| Overall Accuracy (at 1000 Hz) | ±0.1 dB |
Mechanical & Physical Characteristics
| Parameter | Value |
|---|---|
| Standard Connector Type | BNC female |
| Optional Connector Types | Type-N female, TNC female |
| Control Method | Manual (cam-actuated microswitches) |
| Port Bidirectionality | Either terminal may be connected as input or output |
| Series Compatibility | Can be connected with the 355D in series to provide precision attenuation in 1 dB steps from 0 to 132 dB |
Accessories
| Parameter | Value |
|---|---|
| Compatible Interconnect Kit | HP 11716A (Type-N), HP 11716B (BNC) |
Performance
| Parameter | Value |
|---|---|
| Combined Range with HP 355D | 0 to 132 dB in 1 dB steps (when connected in series with HP 355D) |
Technology
Coaxial Step Attenuator
Applications
Precision RF signal attenuation and level control
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