SpecAtlasHub

CBT

Rohde & SchwarzBluetooth

The Rohde & Schwarz CBT is a highly versatile Bluetooth tester designed for fast, accurate RF measurements in both development and production. It supports Bluetooth Basic Rate (BR), Enhanced Data Rate (EDR), and Bluetooth Low Energy (LE) test features, offering comprehensive transmitter, receiver, and audio measurement capabilities in a single integrated instrument.

Audio TestingRF and MicrowaveWireless Communications

Specifications

General

ParameterValue
InterfacesGPIB (IEEE-488.2), LAN (10/100 Base-T), USB 2.0 Host (front and rear), RS-232, VGA output
Display8.4" TFT color display (640 × 480 pixels, VGA resolution)
Warm-Up TimeApprox. 30 min

Physical

ParameterValue
Power Supply100 V to 240 V AC (nominal), 50 Hz to 60 Hz / 400 Hz, power consumption approx. 120 W
Operating Temperature5 °C to 45 °C
Dimensions (W×H×D)435 mm × 192 mm × 426 mm (with feet)
Weight11 kg

RF Transmitter Measurements

ParameterValue
Nominal Power Measurement Accuracy< 0.5 dB (typical < 0.3 dB)
Peak Power Measurement Range-50 dBm to +30 dBm
Carrier Frequency Drift MeasurementSupported
Initial Carrier Frequency Tolerance (ICFT)Supported
Maximum Drift RateSupported
Frequency Deviation Avg (F1)Supported
Frequency Deviation Max (F2)Supported
Modulation Characteristics (GFSK)Supported
Adjacent Channel Power (ACP) MeasurementSupported
EDR Relative Power MeasurementSupported (with Option CBT-K55)
EDR Differential Phase EncodingSupported (with Option CBT-K55)
RMS DEVM (EDR Modulation Accuracy)Supported (with Option CBT-K55)
Peak DEVM (EDR Modulation Accuracy)Supported (with Option CBT-K55)
99% DEVM (EDR Modulation Accuracy)Supported (with Option CBT-K55)
LE Transmit Power MeasurementSupported (with Option CBT-K57)
LE Carrier Frequency Offset and DriftSupported (with Option CBT-K57)
LE Modulation CharacteristicsSupported (with Option CBT-K57)
EDR In-Band Spurious EmissionsSupported (with Option CBT-K55)

RF Receiver Measurements

ParameterValue
Bit Error Rate (BER) Measurement Range0% to 100%
Packet Error Rate (PER) Measurement Range0% to 100%
Receiver Sensitivity SearchAutomatic level sweep capability
Single-Slot Receiver SensitivitySupported
Multi-Slot Receiver SensitivitySupported
Maximum Input Level PerformanceSupported
LE Receiver Sensitivity (PER)Supported (with Option CBT-K57)
Dirty Transmitter EmulationSupported (programmable frequency drift and modulation index)

Supported Bluetooth Standards & Test Modes

ParameterValue
Bluetooth Core Version Compatibilityv1.1, v1.2, v2.0, v2.1, v3.0, v4.0 (with options)
Bluetooth Low Energy (LE) SupportSupported (with Option CBT-K57)
Bluetooth Basic Rate (BR) SupportStandard
Bluetooth Enhanced Data Rate (EDR) SupportSupported (with Option CBT-K55)
Supported BR Packet TypesDH1, DH3, DH5, DM1, DM3, DM5, AUX1, HV1, HV2, HV3, DV, EV3, EV4, EV5
Supported EDR Packet Types2-DH1, 2-DH3, 2-DH5, 3-DH1, 3-DH3, 3-DH5, 2-EV3, 2-EV5, 3-EV3, 3-EV5
Bluetooth Loopback Test ModeSupported
Transmitter Test ModeSupported
Receiver Test ModeSupported
Direct Test Mode (DTM)Supported (for Bluetooth LE)
Connection States SupportedInquiry, Page, Connection

RF Signal Generator (Source) Specifications

ParameterValue
RF Output Frequency Range2400 MHz to 2485 MHz
RF Output Level Range (RF COM)-120 dBm to 0 dBm
RF Output Level Range (RF OUT)-120 dBm to +13 dBm
Level Resolution0.1 dB
Level Uncertainty< 0.5 dB (at 0 dBm)
RF Signal Modulation FormatsGFSK, pi/4-DQPSK, 8DPSK

RF Analyzer (Receiver) Specifications

ParameterValue
RF Input Frequency Range2400 MHz to 2485 MHz
RF Input Level Range (RF COM)-50 dBm to +30 dBm
Maximum Safe Input Level (RF COM)+30 dBm (continuous), +33 dBm (peak)
Input VSWR (RF COM)< 1.2
Absolute Amplitude Accuracy< 0.5 dB

Reference Frequency & Timebase

ParameterValue
Internal Reference Frequency10 MHz
Aging per Year (Standard TCXO)< 1 x 10^-6
Temperature Stability (Standard TCXO)< 1 x 10^-6
External Reference Input Frequency10 MHz
External Reference Output Frequency10 MHz
High-Stability OCXO Option (CBT-B1) Aging per Year< 1 x 10^-7
High-Stability OCXO Option (CBT-B1) Temperature Stability< 5 x 10^-9

Instrument Connectivity & Ports

ParameterValue
RF Input/Output Connector (RF COM)N-type (female), 50 Ohm
RF Output Connector (RF OUT)N-type (female), 50 Ohm
External Trigger Input ConnectorBNC (female)
External Trigger Output ConnectorBNC (female)
Reference Frequency Input PortBNC (female), 10 MHz
Reference Frequency Output PortBNC (female), 10 MHz
External Monitor Output PortD-Sub 15-pin (VGA)

Automation, Software & Control

ParameterValue
Remote Control Command SetSCPI (Standard Commands for Programmable Instruments)
Supported Automation DriversVISA, LabVIEW, LabWindows/CVI
Software Update CapabilityVia USB or LAN

Physical, Power & Environmental

ParameterValue
Storage Temperature Range-40 °C to +70 °C
Recommended Calibration Cycle12 months

Options & Accessories

ParameterValue
Option R&S CBT-K55Bluetooth EDR RF Test Option
Option R&S CBT-K57Bluetooth Low Energy RF Test Option
Option R&S CBT-B1High-Stability OCXO Reference Oscillator Option

RF Ports

ParameterValue
RF Port Impedance50 Ω (nominal)

Options

ParameterValue
Option R&S CBT-B55Audio Board (adds analog audio generator and analyzer inputs/outputs)
Option R&S CBT-K50Audio Testing (adds software support for basic audio measurements and codec testing)

Power Supply

ParameterValue
Mains Supply Frequency Range50 Hz to 60 Hz / 400 Hz
Power ConsumptionApprox. 120 W (fully equipped)

Options & Ordering

ParameterValue
Option R&S CBT-B20GPIB (IEEE-488) Interface

Option R&S CBT-B41 (Audio)

ParameterValue
Supported Audio ProfilesHFP, HSP, A2DP
Supported Audio CodecsCVSD, A-law, µ-law, SBC
Audio Generator Frequency Range10 Hz to 20 kHz
Audio Generator Frequency Resolution0.1 Hz
Audio Analyzer Frequency Range20 Hz to 20 kHz
Audio Analyzer Measurement FunctionsLevel, frequency, THD, THD+N, SINAD

Frequency

ParameterValue
RF Output Frequency Resolution1 kHz
RF Input Frequency Resolution1 kHz

Technology

Bluetooth Test Technology

Applications

RF transmitter, receiver, and audio testing of Bluetooth devices in manufacturing and development