Choosing the right instrument is half the measurement. The wrong tool can still produce a number, but it will be the wrong number, or the right number at the wrong cost, speed, or confidence. This appendix maps common measurement tasks to the instrument category built for them, then describes the Berkeley Nucleonics RF instrument families in general terms so you know where to look. Specific models, frequency ranges, and performance figures change as products evolve, so treat every product reference here as a pointer and verify all specs and model numbers against current datasheets before you specify or buy.
Start with the question, not the catalog. What are you trying to learn, and how good does the answer have to be? The table below pairs the most common RF measurement tasks with the instrument category that does them well.
| Measurement task | Instrument category | What it answers |
|---|---|---|
| What frequencies are present, and at what level | Spectrum analyzer (swept or FFT) | Amplitude versus frequency |
| Catch brief, hopping, or bursting signals | Real-time spectrum analyzer | Probability of intercept, transient capture |
| Insertion loss, return loss, S-parameters | Vector network analyzer (VNA) | Magnitude and phase versus frequency |
| Filter, cable, and connector loss (scalar) | Spectrum analyzer with tracking generator | Frequency response magnitude |
| Generate a clean test stimulus | Signal generator (analog or vector) | Controlled tone or modulated signal |
| Receiver and amplifier noise figure | Noise figure analyzer or NF option | Added noise, sensitivity impact |
| Radiated and conducted emissions | EMI receiver | Compliance against CISPR, FCC, MIL-STD |
| Time-domain pulse and transient shape | Oscilloscope (wideband or RF) | Amplitude versus time |
| Modulation quality (EVM, ACPR) | Vector signal analyzer | Digital signal fidelity |
A few rules of thumb tie the table together. If the question is "what is in the air," reach for a spectrum analyzer, and reach for a real-time analyzer when the signals are short-lived or agile. If the question is "how does this network respond," reach for a VNA, because only a VNA measures phase as well as magnitude. If you need to drive the device under test, you need a signal source. And if the question is about compliance, only a calibrated EMI receiver with the right detectors (peak, quasi-peak, average) will produce results a regulator accepts.
Picking the category is the first cut. The second cut is matching the instrument's capability to the demands of the job. Five parameters drive most decisions.
Frequency range comes first. The instrument must cover the fundamentals and, for distortion and harmonic work, several multiples above them. A device that operates at 6 GHz often needs measurement coverage past 18 GHz to capture its third harmonic.
Bandwidth and speed come next, and they matter most for modern, wide, agile signals. A swept analyzer can miss a signal that appears and vanishes between sweeps. An FFT or real-time analyzer with enough analysis bandwidth and a high enough frame rate will catch it. The relevant spec is the probability of intercept for the shortest signal you care about.
Dynamic range and sensitivity decide whether you can see a small signal next to a large one, or a weak signal near the noise floor. Phase noise on the local oscillator, displayed average noise level, and third-order intercept all feed into this.
Accuracy and calibration determine whether the number you report can be defended. For S-parameters this means a proper SOLT or TRL calibration. For EMI it means a calibrated receiver and antenna factors traceable to a standard.
Finally, form factor and connectivity shape how the instrument fits your workflow. Benchtop, portable, and rack or modular (PXI and USB) formats trade portability against channel count and automation. If the measurement lives in an automated test system, programmability through SCPI and a stable driver matter as much as raw performance.
Berkeley Nucleonics builds instruments across the RF and microwave categories described above. The families below are described generically, by what they do, not by model number or specification. Always confirm the current model, frequency coverage, options, and performance on the active datasheet, because these details change between product generations. Treat everything in this section as "verify against current datasheet."
Signal generators. BNC offers RF and microwave signal generators spanning analog and vector source families, used to provide clean, controlled stimulus for receiver testing, component characterization, and as local oscillator references. Confirm frequency range, output power, phase noise, and modulation capability against the current datasheet.
Signal and spectrum analysis. BNC offers spectrum analysis instruments, including real-time analysis capability for catching brief and agile signals. These serve the "what is in the air" tasks in the selection table. Confirm frequency coverage, real-time bandwidth, displayed average noise level, and detector options against the current datasheet.
Pulse and timing generators. BNC has a long heritage in precision pulse and delay generation, used to trigger, gate, and synchronize test setups, including radar and timing-critical applications. Confirm channel count, timing resolution, and jitter against the current datasheet.
Microwave and specialty sources. BNC offers higher-frequency microwave source families for applications that push into the microwave and millimeter-wave region. Confirm upper frequency limit, harmonic performance, and available options against the current datasheet.
When in doubt, the safe path is to define the measurement first, identify the category from the table in section D.1, list the five requirement parameters from section D.2, and then ask a BNC applications engineer to map those requirements to a current product. That keeps the selection grounded in the measurement rather than the catalog, and it avoids specifying against a model or number that may have changed.
[1] Berkeley Nucleonics Corporation product datasheets, current editions. Verify all model numbers, frequency ranges, and performance specifications against the active datasheet before publication or purchase.
[2] IEEE Std 100, The Authoritative Dictionary of IEEE Standards Terms, for measurement terminology. Verify current edition before publication.
[3] CISPR 16 and MIL-STD-461, for EMI receiver and detector requirements referenced in the selection table. Verify current editions before publication.