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The Advantest R3261/3361 Series is a family of compact, lightweight spectrum analyzers built on a synthesized system to cover wide frequency bands of 9 kHz to 2.6 GHz (R3261C/3261CN/3361C/3361CN) or 9 kHz to 3.6 GHz (R3261D/3361D). Advantest's long experience in RF technology combined with software calibration technology yields a total level accuracy of 1 dB (typical value), enabling accurate level measurements without linearity error from IF-stage log amp or RBW switching.
These analyzers address occupied bandwidth measurement, adjacent channel leakage power measurement, and intermittent (burst) signal measurement. A unique sound monitor mode, together with a marker pause function, allows sound to be monitored during panoramic reception measurements when measuring electric field strength or doing EMC measurements. The manual sweep function is suited to QP and EMC work, where the peak QP value can be measured quickly and then only a point specified by the rotary knob is measured. The series has been used by NHK (Japanese broadcaster) and the Defense Agency.
ValueTronics International stocks and holds its own inventory in a 20,000 square foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every used unit is inspected and functionally verified in-house before it ships, while new units ship factory-sealed exactly as received from the manufacturer. Holding inventory directly means quicker access to instruments like the R3261/3361 Series and a single accountable source for the purchase.
Advantest Corporation traces its origins to Takeda Riken, the Japanese instrument maker that adopted the Advantest name in 1985. The company has continued under the Advantest name since.
The R3261/3361 Series lets a buyer choose from six models depending upon the application. All share the same portable, synthesized architecture, the 120 dB dynamic-range CRT display, 1 Hz frequency resolution, and standard GPIB and IC memory card functions, differing in frequency coverage, input impedance, and whether a tracking generator is built in.
The R3261 group is offered as spectrum analyzers, while the R3361 group adds an internal tracking generator for stimulus-response measurements such as filter and amplifier frequency-response characterization.
Each model below is its own dedicated product page with condition-matched pricing for the available pre-owned unit. Choose the model whose frequency range, input impedance, and tracking-generator configuration fit your application, then select the listed pre-owned unit.
The R3261D extends coverage to 9 kHz to 3.6 GHz with a 50 ohm, N-type input. It is a spectrum-analyzer configuration without the internal tracking generator found on the R3361 group.
The models divide along three axes shown in the comparison table. Frequency coverage is 9 kHz to 2.6 GHz on the R3261C, R3261CN, R3361C, and R3361CN, and 9 kHz to 3.6 GHz on the R3261D and R3361D. Input impedance is 50 ohm on the C and D variants and 75 ohm on the CN variants.
The internal tracking generator is provided on the R3361C, R3361CN, and R3361D only; the R3261 models do not include it. Additional functions such as the controller and burst-signal (intermittent signal) measurement capability are available as options across the series, as indicated in the comparison table.
| Model | Frequency Range | Input Impedance | Tracking Generator |
|---|---|---|---|
| R3361C | 9 kHz to 2.6 GHz | 50 Ω | Standard |
| R3261C | 9 kHz to 2.6 GHz | 50 Ω | None |
| R3261CN | 9 kHz to 2.6 GHz | 75 Ω | None |
| R3261D | 9 kHz to 3.6 GHz | 50 Ω | None |
Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.
| Specification | Value |
|---|---|
| Frequency | |
| Measuring frequency range (R3261C/3261CN/3361C/3361CN) | 9 kHz to 2.6 GHz |
| Measuring frequency range (R3261D/3361D) | 9 kHz to 3.6 GHz |
| Central frequency setting resolution | 1 Hz |
| Central frequency display accuracy | ±(3% of span + central frequency × reference oscillator accuracy + 20 Hz) at span ≤ 2 MHz; ±(2% of span + central frequency × reference oscillator accuracy + 50 Hz) at span ≤ 2 MHz |
| Reference oscillator | Switching by internal or external input (10 MHz) |
| Internal reference oscillator stability | ± 2 × 10⁻⁸/day, ± 2 × 10⁻⁷/year aging |
| Temperature stability | ± 5 × 10⁻⁸ (0 to 50°C, +25°C reference) |
| Frequency span (Linear mode) | 1 kHz to 2.6 GHz (R3261D/3361D: 3.6 GHz) and zero |
| Frequency span (Log mode) | 1, 2, or 3 decades selected between 10 kHz to 1000 MHz |
| Frequency span accuracy | ≤ ± 3% of span (Span > 2 MHz); ≤ 5% of span (Span ≤ 2 MHz) |
| Frequency stability — Residual FM | 50 kHzp-p or less (Span > 10 MHz); 2 kHzp-p or less (10 MHz ≥ Span > 2 MHz); 20 Hzp-p or less (Span ≤ 2 MHz) |
| Frequency drift | 300 Hz/min or less (Span ≤ 2 MHz, at stable temperature after 1 hr. warm-up) |
| Sideband noise | ≤ –105 dBc/Hz, f ≤ 3.0 GHz, 20 kHz offset; ≤ –101 dBc/Hz, f ≤ 3.6 GHz, 20 kHz offset |
| Resolution — 3 dB bandwidth | 30 Hz to 1 MHz; switchable in 1 to 3 steps |
| Resolution — 6 dB bandwidth | 200 Hz, 9 kHz, 120 kHz |
| Selectivity | ≤ 15 : 1 (60 dB : 3 dB) |
| Bandwidth accuracy | ≤ 20% |
| Marker accuracy (Normal mode) | Central frequency display accuracy + span accuracy |
| Marker accuracy (Counter mode) | Display frequency × reference oscillator accuracy ± 1 count (span ≤ 100 MHz) |
| Amplitude | |
| Amplitude measuring range (R3261C/3261D/3361C/3361D) | –130 dBm to +25 dBm |
| Amplitude measuring range (R3261CN/3361CN) | –19 dBµV to +132 dBµV |
| Screen display range (Log mode) | 120 dB (10 dB/div), 80 dB (10 dB/div), 50 dB (5 dB/div), 20 dB (2 dB/div), 10 dB (1 dB/div) |
| Screen display range (Linear mode) | 10 div |
| Screen display range (QP mode) | 80 dB (10 dB/div) when measuring range is 70 dB |
| Display linearity (Log mode) | ± 2.0/110 dB, ± 1.5/70 dB, ± 1.0/10 dB, ± 0.2/1 dB |
| Display linearity (Linear mode) | ± 5% of full scale |
| Display linearity (QP mode) | ± 2.0 dB/70 dB, ± 1.0/40 dB |
| Reference level display range (R3261C/3261D/3361C/3361D) | –109.9 to +40.0 dBm |
| Reference level display range (R3261CN/3361CN) | +0.1 to +150 dBµV |
| Reference level accuracy, after automatic calibration (R3261C/3261D/3361C/3361D) | ≤ ± 0.3 dB (0 to –50 dBm / +110 to +60 dBµV) |
| Reference level accuracy, after automatic calibration (R3261CN/3361CN) | ≤ ± 0.7 dB (+20 to –70 dBm / +130 to +40 dBµV) |
| Dynamic Range | |
| Average noise level (R3261C/3261D/3361C/3361D) | –121 dBm + 1.55f(GHz) dB |
| Average noise level (R3261CN/3361CN) | –10 dBµV + 1.55f(GHz) dB |
| Average noise level conditions | Resolution bandwidth: 300 Hz, video bandwidth: 1 Hz, input attenuator: 0 dB, frequency: 10 MHz or more |
| Secondary and tertiary distortion | ≤ –70 at –30 dBm input, input attenuator: 0 dB, frequency: 10 MHz or more |
| Frequency response (R3261C/3261D/3361C/3361D) | ≤ +0.5 dB 100 kHz to 2 GHz; ≤ +1.0 dB 9 kHz to 3.6 GHz |
| Frequency response (R3261CN/3361CN) | ≤ +0.5 dB 100 kHz to 2 GHz; ≤ +1.5 dB 9 kHz to 2.6 GHz |
| Frequency response conditions | Log mode, input attenuator: 10 dB, temperature: 20 to 30°C |
| Residual response (R3261C/3261D/3361C/3361D) | ≤ –100 dBm (Termination: 50 Ω) |
| Residual response (R3261CN/3361CN) | ≤ 11 dBµV (Termination: 75 Ω) |
| Residual response conditions | Input attenuator: 0 dB, frequency: 500 kHz or more |
| Resolution bandwidth switching accuracy | ≤ ± 0.3 dB after automatic calibration |
| Video filter | 1 Hz to 1 MHz; switchable in 1 or 10 steps |
| Sweep | |
| Sweep time | 50 ms to 1000 s and manual sweep |
| Sweep time accuracy | ≤ 3% |
| Trigger modes | FREE RUN, LINE, VIDEO, EXT, TV-V, and SINGLE |
| Input | |
| Input impedance (R3261C/3261D/3361C/3361D) | 50 Ω |
| Input impedance (R3261CN/3361CN) | 75 Ω |
| VSWR | ≤ 1.5 (100 kHz to 2 GHz at input attenuator ≥ 10 dB); ≤ 2.0 (9 kHz to 3.6 GHz) |
| Input connector | N type |
| Maximum input level (R3261C/3261D/3361C/3361D) | +25 dBm (attenuator ≥ 30 dB), ± 50 VDC max. |
| Maximum input level (R3261CN/3361CN) | +132 dBµV (input attenuator ≥ 30 dB), ± 50 VDC max. |
| Input attenuator | 0 to 50 dB in 10 dB steps |
| Input attenuator switching accuracy | ≤ 1.0 dB (≤ 2.0 GHz), ≤ 1.5 dB (≤ 3.6 GHz) with input attenuator 10 dB reference |
| Detection modes | NORMAL, POSI, NEGA, and SAMPLE |
| Tracking Generator (R3361C/3361CN/3361D) | |
| Frequency range (R3361C/3361CN) | 9 kHz to 2.6 GHz |
| Frequency range (R3361D) | 9 kHz to 3.6 GHz |
| Output level range (R3361C/3361D) | 0 to –50 dBm, setting in 1-dB steps |
| Output level range (R3361CN) | +105 to 55 dBµV, setting in 1-dB steps |
| Output level accuracy | ≤ ± 0.5 dB (30 MHz, –10 dBm, 20° to 30°C) |
| Output level flatness (R3361C/3361D) | ≤ 0.7 dB 100 kHz to 1.0 GHz; ≤ 1.5 dB 100 kHz to 2.6 GHz at –10 dBm; ≤ 2.0 dB 9 kHz to 3.6 GHz |
| Output level flatness (R3361CN) | ≤ 0.7 dB 100 kHz to 1.0 GHz; ≤ 1.5 dB 100 kHz to 2.0 GHz; ≤ 2.0 dB 9 kHz to 2.6 GHz |
Important: Maximum input level: +25 dBm (input attenuator 30 dB or greater); plus or minus 50 VDC max.
This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects.
ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
Advantest
Condition
Pre-Owned
Manufacturer
ADVANTEST
Spec_ana_freq
9 kHz to 2.6 GHz
30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
On-site Lab
30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
On-site Lab
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