Advantest R3273-01-74-21 Spectrum Analyzer, 100 Hz to 26.5 GHz
Product Overview
The Advantest R3273 delivers high dynamic range, low phase noise, and fast sweep capabilities required for modern digital communication systems. The option suffix -01-74-21 specifies key factory-installed hardware configurations:
Option 01: High-Stability Reference Oscillator (Oven Controlled Crystal Oscillator / OCXO)
Option 74: Digital Modulation Analysis / CDMA hardware extension
Option 21: Additional memory/interface expansion board
Technical Specification Table
| Attribute / Parameter | Technical Specification |
| Manufacturer | Advantest Corporation |
| Model Number | R3273 (Part: R3273-01-74-21) |
| Frequency Range | 100 kHz to 26.5 GHz |
| Resolution Bandwidth (RBW) | 1 Hz to 5 MHz (1-3 step sequence) |
| Video Bandwidth (VBW) | 1 Hz to 5 MHz |
| Displayed Average Noise Level (DANL) | -145 dBm/Hz (at 2 GHz) |
| SSB Phase Noise | -113 dBc/Hz @ 10 kHz offset (1 GHz carrier) |
| Frequency Reference Stability | $\pm 2 \times 10^{-8}/\text{year}$ (with Option 01 OCXO) |
| Input Impedance / Connector | 50 $\Omega$, N-type (female) / APC 3.5mm |
| Maximum Safe RF Input Power | +30 dBm (1 Watt continuous), 0 V DC |
| Display & Interface | 6.5-inch Color TFT LCD; GPIB (IEEE-488), RS-232, Parallel Printer Port |
Environmental Tolerance Conditions
Operating Temperature: 0 °C to +50 °C
Operating Relative Humidity: 80% RH maximum (non-condensing)
Operating Altitude: Up to 2.000 meters (6.500 feet) above sea level
Vibration Resistance: Meets MIL-PRF-28800F Class 3 standard operational vibration
Operating Instructions
Power-On Inspection: Verify the voltage selector matches local supply (100–120 VAC / 220–240 VAC). Turn power on and allow a 30-minute warm-up period for Option 01 (OCXO) to stabilize frequency output.
RF Input Precaution: Always use a DC block or external attenuator if measuring signals with DC offset or power levels above +20 dBm to avoid destroying the input mixer.
Self-Calibration Run: Press [SHIFT] $\rightarrow$ [CAL] $\rightarrow$ select [ALL CAL]. Ensure no signal is connected to the input during alignment.
Frequency & Span Setting: Press [FREQ], enter center frequency. Press [SPAN], set desired observation bandwidth.
Amplitude Alignment: Press [AMPLITUDE], adjust Reference Level to bring peak signal within the top 10 dB of grid display for optimal ADC dynamic range.
Fault Diagnosis
| Error Symptom | Likely Cause | Recommended Action |
| “UNLK” / Local Oscillator Unlock | Internal PLL lock failure or damaged OCXO module | Check Option 01 oscillator status; power cycle or recalibrate reference. |
| NO SIGNAL / High Noise Floor | Blown input attenuator or mixer front-end from RF overload | Run internal self-diagnostic (SHIFT + DIAG). Front-end repair required if attenuator is open. |
| Screen Freeze / Boot Failure | Corrupted internal SRAM/flash or failed RAM board (Opt 21) | Reseat Option 21 expansion card; check internal backup battery voltage. |
| Inaccurate Amplitude Reading | Uncalibrated baseline or drift due to temperature shift | Perform full CAL ALL routine after 30-minute warm-up period. |
Related Models of the Same Series
Advantest R3267: Frequency range 100 kHz to 8.0 GHz
Advantest R3272: Frequency range 9 kHz to 26.5 GHz (Standard RF performance)
Advantest R3263: High-performance unit tailored for digital mobile communications (9 kHz to 3.0 GHz)
Advantest R3465: Portable communications spectrum analyzer series
Storage Conditions
Storage Temperature: -20 °C to +60 °C
Storage Humidity: 10% to 90% RH (non-condensing)
Long-Term Storage: Store in an ESD-safe, dust-controlled environment inside moisture-barrier packaging. Recharge internal backup batteries every 12 months by powering the unit on for 24 continuous hours.