The BM Series comprises manually adjustable stepped attenuators in a bench-mount configuration for RF and microwave applications. The different models provide controlled signal attenuation in 50 or 75 ohm systems.
Depending on the configuration, the series includes models with BNC, SMA, N or F female connectors, frequency specifications from 500 MHz to 18 GHz or from DC to 3 GHz, and attenuation ranges from 0–1 dB to 0–110 dB.
Advantages
- Multiple attenuation ranges: Models with maximum attenuation values from 1 to 110 dB support different measurement and test requirements.
- Several step sizes: Depending on the model, attenuation can be selected in 0.1 dB, 1 dB or 10 dB steps.
- 50 and 75 ohm versions: The series supports different RF system impedances.
- Multiple RF connector options: Versions with BNC, SMA, N and F female connectors are available.
- Manual bench-mount format: The units are intended for direct operation within laboratory, test-bench and measurement setups.
Key features
- Product type: Manual rotary stepped attenuator in a bench-mount configuration
- Impedance: 50 ohm or 75 ohm, depending on the model
- RF connectors: BNC female, SMA female, N female or F female
- Highest specified frequency: 18 GHz
- Attenuation ranges: 0–1 dB to 0–110 dB, depending on the model
- Step sizes: 0.1 dB, 1 dB or 10 dB
- Stage configuration: Single-stage, double-stage or triple-stage versions
- Mounting configuration: Bench mount
Typical applications
- Manual adjustment of RF signal levels
- Signal attenuation within RF and microwave measurement chains
- Laboratory setups and development measurements
- Integration into RF test benches and test systems
- Comparison, characterisation and calibration setups
- Systems using a 50 or 75 ohm impedance
Additional information
Selection of the appropriate model primarily depends on the required system impedance, connector type, frequency specification, maximum attenuation and step size. EMCO provides technical support for selecting and positioning the appropriate stepped attenuator within an RF or microwave measurement setup.
Model overview
The BM Series includes different manual RF stepped attenuators for 50 and 75 ohm systems. Open the relevant product group to display the available models and technical configurations.
50 ohm models with BNC female connectors – 9 models
| Model |
Frequency specification |
Attenuation range |
Step size |
Stage configuration |
| BM10022 |
2 GHz |
0–110 dB |
1 dB |
Double stage |
| BM10023 |
2 GHz |
0–80 dB |
1 dB |
Double stage |
| BM10024 |
2 GHz |
0–81 dB |
0.1 dB |
Triple stage |
| BM10030 |
1 GHz |
0–1 dB |
0.1 dB |
Single stage |
| BM10031 |
1 GHz |
0–100 dB |
10 dB |
Single stage |
| BM10032 |
2 GHz |
0–10 dB |
1 dB |
Single stage |
| BM10033 |
2 GHz |
0–70 dB |
10 dB |
Single stage |
| BM10034 |
2 GHz |
0–100 dB |
10 dB |
Single stage |
| BM10035 |
2 GHz |
0–1 dB |
0.1 dB |
Single stage |
75 ohm models with BNC female connectors – 5 models
| Model |
Frequency specification |
Attenuation range |
Step size |
Stage configuration |
| BM10025 |
500 MHz |
0–1 dB |
0.1 dB |
Single stage |
| BM10026 |
500 MHz |
0–10 dB |
1 dB |
Single stage |
| BM10027 |
500 MHz |
0–70 dB |
10 dB |
Single stage |
| BM10028 |
1 GHz |
0–10 dB |
1 dB |
Single stage |
| BM10029 |
1 GHz |
0–1 dB |
0.1 dB |
Single stage |
50 ohm models with SMA female connectors up to 6 GHz – 8 models
| Model |
Frequency specification |
Attenuation range |
Step size |
Stage configuration |
| BM10054 |
2.5 GHz |
0–50 dB |
1 dB |
Single stage |
| BM10070 |
6 GHz |
0–1 dB |
0.1 dB |
Single stage |
| BM10071 |
6 GHz |
0–10 dB |
1 dB |
Single stage |
| BM10072 |
6 GHz |
0–60 dB |
10 dB |
Single stage |
| BM10087 |
DC–2 GHz |
0–30 dB |
1 dB |
Single stage |
| BM10091 |
DC–3 GHz |
0–10 dB |
1 dB |
Single stage |
| BM10092 |
DC–1 GHz |
0–100 dB |
10 dB |
Single stage |
| BM10094 |
DC–2.5 GHz |
0–100 dB |
10 dB |
Single stage |
50 ohm models with SMA female connectors up to 18 GHz – 4 models
| Model |
Frequency specification |
Attenuation range |
Step size |
Stage configuration |
| BM10073 |
18 GHz |
0–9 dB |
1 dB |
Single stage |
| BM10074 |
18 GHz |
0–69 dB |
1 dB |
Single stage |
| BM10075 |
18 GHz |
0–80 dB |
10 dB |
Single stage |
| BM10076 |
18 GHz |
0–99 dB |
1 dB |
Single stage |
50 ohm models with N female connectors – 5 models
| Model |
Frequency specification |
Attenuation range |
Step size |
Stage configuration |
| BM10077 |
6 GHz |
0–1 dB |
0.1 dB |
Single stage |
| BM10078 |
6 GHz |
0–10 dB |
1 dB |
Single stage |
| BM10079 |
6 GHz |
0–60 dB |
10 dB |
Single stage |
| BM10093 |
DC–2.5 GHz |
0–50 dB |
1 dB |
Single stage |
| BM10097 |
2 GHz |
0–70 dB |
1 dB |
Single stage |
75 ohm model with F female connector – 1 model
| Model |
Frequency specification |
Attenuation range |
Step size |
Stage configuration |
| BM10096 |
DC–1 GHz |
0–10 dB |
1 dB |
Single stage |
