BR121-124 4-CH Programmable ATT
BR121-124 4-CH Programmable ATT
BR121-124 RF Attenuator
Multi-channel Programmable Attenuator(4 CHANNELS)，1-8000MHz，0-124.75dB(0.25dB Step)
Product Appearance
PIN:60.06.041.0076
General pictures are for illustration only
Product Overview
The BR121-124 is a 4-channel, wide-band (1–8000 MHz) programmable RF attenuator with high-precision 0.25 dB steps. It supports serial port (RS232/DB9) , Ethernet (TCP) remote control, and local operation via a 4.3-inch touchscreen. With 50 Ω impedance and SMA–F connectors, it meets the high-precision power control requirements of both laboratories and production lines.
Technical Parameter
| Parameter | Frequency Range (MHz) | Condition | Min. | Typ. | Max. |
| Attenuation Range (dB) | 1-8000 | 0.25step | 0 | - | 124.75 |
| VSWR | 1-8000 | 0-124.75dB | - | - | 2.3 |
| Maximum RF Input Power (W) | 1-8000 | 0-124.75dB | - | 0.6 | 1.2 |
| Insertion Loss (dB) | 1-2500 | 0dB | - | 6.1 | 6.3 |
| 2500-6000 | 0dB | - | 10.5 | 10.7 | |
| 6000-8000 | 0dB | - | 13.7 | 13.9 | |
| Weight (kg) | - | - | - | 4.5 | - |
| Operating Temperature (°C) | - | - | -20 | - | +70 |
| Impedance (Ω) | 50 | ||||
| Interface Type | SMA Female | ||||
| Power Supply (V) | 110-250VAC | ||||
| Number of Channels | 4 | ||||
| Overall Dimensions | Standard 2U Chassis (350 mm × 250 mm × 235 mm) | ||||
| Note | The device's USB port is intended for device upgrades; the power must remain connected when using it. Do not use it for any other purpose. | ||||
Big Deal
Ultra-wideband: 1–8,000 MHz, compatible with mainstream wireless and microwave bands
Precise Control: 0.25 dB steps, attenuation range 0–124.75 dB, high adjustment accuracy
Multi-Channel Parallel Operation: 4 independently controlled channels for improved test efficiency
Dual Operating Modes: Remote control (RS232/DB9/Ethernet) + local touchscreen operation
Stability: Low VSWR (≤2.3) and high attenuation accuracy, meeting the requirements of standard RF testing
Wide-Voltage Power Supply: 110–250 VAC, suitable for worldwide use; operating temperature: -20 to +70 °C
Applications
RF module / terminal power calibration and dynamic range testing
Wireless communication (2G/3G/4G/5G Sub-6G) receiver sensitivity testing
Precise power attenuation and link simulation for laboratory signal sources
Power control units for automated test equipment (ATE) on production lines
Performance verification and aging tests for RF components (amplifiers, filters, antennas)
Control Method
| Remote Operation | Serial Port (RS232/DB9), Ethernet Port (TCP) |
| Touchscreen Operation | 4.3-inch touchscreen |
Attenuation Accuracy(dB)
| Parameter | Freq. Range | Condition | Typ. | Max. |
Atten. Accuracy (dB) | 0-2.5GHz | 0-30dB | 0.15 | 0.2 |
| 30.25-60dB | 0.3 | 0.5 | ||
| 60.25-90dB | 0.9 | 1.1 | ||
| 90.25-124.75dB | 2 | 2.6 | ||
| 2.5-6GHz | 0-30dB | 1.3 | 1.8 | |
| 30.25-60dB | 3 | 3.6 | ||
| 60.25-90dB | 4 | 5.6 | ||
| 90.25-124.75dB | 5 | 6.5 | ||
| 6-8GHz | 0-30dB | 1 | 1.5 | |
| 30.25-60dB | 2 | 2.6 | ||
| 60.25-90dB | 4.5 | 4.5 | ||
| 90.25-124.75dB | 6 | 9 |
Test Report
*The information in this document is intended to assist users in product selection. Users are advised to conduct tests to determine whether the product meets the requirements of the corresponding application scenarios. Product specifications and descriptions herein are subject to change without prior notice.