# Anritsu MS2661C 9 kHz to 3 GHz Portable Spectrum Analyzer (Pre-Owned) # Anritsu MS2661C 9 kHz to 3 GHz Portable Spectrum Analyzer (Pre-Owned) ## Key Features At A Glance - Frequency range 9 kHz to 3 GHz for digital radio equipment and CATV signal analysis - Average noise level ≤-115 dBm (1 MHz to 1 GHz) and ≤-114 dBm (>1 GHz) for low-level signal measurement - Maximum input level +30 dBm (CW average power, RF ATT ≥10 dB), ±50 Vdc - Resolution bandwidth from 1 kHz to 3 MHz standard; 30 Hz, 100 Hz, and 300 Hz with Option 02 - 5.5-inch color TFT-LCD with 17-color display and dual-trace simultaneous sweep capability - Built-in Measure functions: frequency counter, C/N, adjacent channel power, occupied bandwidth, burst average power, and template comparison - GPIB (IEEE488.2) and RS-232C interfaces standard for remote control and automated measurement systems - PTA programming environment with 192 KB program memory for user-defined measurement applications The Anritsu MS2661C is a portable synthesized spectrum analyzer covering 9 kHz to 3 GHz, designed for signal analysis of radio and other equipment related to improving frequency usage efficiency, higher modulation, and digitalization. The instrument combines high C/N ratio, low distortion, and high frequency and level accuracy in a portable package suitable for both field and bench use. Per the datasheet, the MS2661C addresses analysis of digital radio equipment and CATV signals. The built-in Measure function supports evaluation of radio equipment through dedicated routines for frequency counter, C/N, adjacent channel power, occupied frequency bandwidth, burst average power, and template decision functions. A two-screen display capability and FM demodulation waveform display extend the instrument's application reach within these areas. ## Brand Heritage Anritsu Corporation is a Japanese precision measurement company with roots stretching to 1895. The Anritsu organization relevant to the test and measurement market was significantly shaped by its 1993 acquisition of Wiltron Company, which transferred Wiltron's RF and microwave measurement technology and North American commercial presence into Anritsu. Instruments originally branded Wiltron are part of the Anritsu product lineage today. ## Accessories Supplied - F0013 Power cord, 2.6 m: 1 pc - W1251AE Fuse, 5 A: 2 pcs - MS2650B, MS2660B/C series operation manual: 1 copy - B0329G Front cover (3/4MW4U) ## Product Core & Specifications Frequency Frequency range 9 kHz to 3 GHz Display frequency accuracy ± (display frequency x reference frequency accuracy + span x span accuracy + 100 Hz) \*Span: ≥10 kHz, after calibration Marker frequency display accuracy Normal: Same as display frequency accuracy; Delta: Same as frequency span accuracy Frequency counter Resolution: 1 Hz, 10 Hz, 100 Hz, 1 kHz; Accuracy: Display frequency x reference frequency accuracy ±1 LSD (at S/N: ≥20 dB) Frequency span Setting range: 0 Hz, 1 kHz to 3.1 GHz; Accuracy: ±2.5% (span: ≥10 kHz), ±5% (span: <10 kHz, with option 02) Resolution bandwidth (RBW) (3 dB bandwidth) Setting range: 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz, 300 kHz, 1 MHz, 3 MHz (manually settable, or automatically settable according to frequency span). \*Option 02: 30 Hz, 100 Hz, and 300 Hz are added. Bandwidth accuracy: ±20% (1 kHz to 1 MHz), ±30% (3 MHz). Selectivity (60 dB : 3 dB): ≤15:1 Video bandwidth (VBW) 1 Hz to 3 MHz (1-3 sequence), OFF (manually settable, or automatically settable according to RBW) Noise sideband, stability Noise sideband: ≤–100 dBc/Hz (1 GHz, 10 kHz offset); Residual FM: ≤20 Hzp-p/0.1 s (1 GHz, span: 0 Hz); Frequency drift: ≤200 Hz/min (span: ≤10 kHz, sweep time: ≤100 s) \*After 1-hour warm-up at constant ambient temperature Reference oscillator Frequency: 10 MHz; Aging rate: 2 x 10–6/year (typical); Option 01: 1 x 10–7/year, 2 x 10–8/day; Temperature characteristics: 1 x 10–5 (typical, 0° to 50°C); Option 01: ±5 x 10–8 (0° to 50°C) \*Referenced to frequency at 25°C Amplitude Level measurement Measurement range: Average noise level to +30 dBm; Maximum input level: +30 dBm (CW average power, RF ATT: ≥10 dB), ±50 Vdc; Average noise level: ≤–115 dBm (1 MHz to 1 GHz), ≤–115 dBm + f \[GHz\] dB (>1 GHz), ≤–114 dBm (1 MHz to 1 GHz, at Option 08 pre-amplifier installed), ≤–114 dBm + 1.5f \[GHz\] dB (>1 GHz, at Option 08 pre-amplifier installed) \*RBW: 1 kHz, VBW: 1 Hz, RF ATT: 0 dB; Residual response: ≤–100 dBm (RF ATT: 0 dB, input: 50 Ω termination, 1 MHz to 3 GHz) Total level accuracy ±1.3 dB (100 kHz to 3 GHz) \*Level measurement accuracy after calibration using internal calibration signal. Total level accuracy: Reference level accuracy (0 to –49.9 dBm) + frequency response + log linearity (0 to –20 dB) + calibration signal source accuracy Reference level Setting range: Log scale: –100 to +30 dBm; Linear scale: 224 µV to 7.07 V. Unit: Log scale: dBm, dBµV, dBmV, V, dBµVemf, W, dBµV/m; Linear scale: V. Reference level accuracy: ±0.4 dB (–49.9 to 0 dBm), ±0.75 dB (–69.9 to –50 dBm, 0.1 to +30 dBm), ±1.5 dB (–80 to –70 dBm) \*After calibration, at 100 MHz, span: 1 MHz (when RF ATT, RBW, VBW, and sweep time set to AUTO). RBW switching uncertainty: ±0.3 dB (1 kHz to 1 MHz), ±0.4 dB (3 MHz) \*After calibration, referenced to RBW: 3 kHz. Input attenuator (RF ATT): Setting range: 0 to 70 dB (10 dB steps) \*Manually settable, or automatically settable according to reference level; Switching uncertainty: ±0.3 dB (0 to 50 dB), ±1.0 dB (0 to 70 dB) \*After calibration, frequency: 100 MHz, referenced to RF ATT: 10 dB Frequency response ±0.5 dB (100 kHz to 3 GHz, referenced to 100 MHz, RF ATT: 10 dB, 18° to 28°C); ±1.5 dB (9 to 100 kHz, referenced to 100 MHz, RF ATT: 10 dB, 18° to 28°C); ±1.0 dB (100 kHz to 3 GHz, referenced to 100 MHz, RF ATT: 10 to 50 dB) Waveform display Scale (10 div): Log scale: 10, 5, 2, 1 dB/div; Linear scale: 10, 5, 2, 1%/div. Linearity (after calibration): Log scale: ±0.4 dB (0 to –20 dB), ±1.0 dB (0 to –70 dB), ±1.5 dB (0 to –85 dB), ±2.5 dB (0 to –90 dB); Linear scale: ±4% (compared to reference level). Marker level resolution: Log scale: 0.01 dB; Linear scale: 0.02% of reference level Spurious response 2nd harmonic distortion: ≤–60 dBc (10 to 200 MHz), ≤–75 dBc (0.2 to 1.5 GHz), ≤–80 dBc (0.8 to 1 GHz) \*Mixer input: –30 dBm. Two signals 3rd order intermodulation distortion: ≤–70 dBc (10 to 100 MHz), ≤–80 dBc (0.1 to 3 GHz) \*Frequency difference of two signals: ≥50 kHz, mixer input: –30 dBm 1 dB gain compression ≥–5 dBm (≥100 MHz, at mixer input level) Maximum dynamic range 1 dB gain compression level to average noise level: >110 dB (0.1 to 1 GHz), >110 dB – f \[GHz\] dB (>1 GHz), >109 dB (0.1 to 1 GHz, at Option 08 pre-amplifier installed), >109 dB – 1.5f \[GHz\] (>1 GHz, at Option 08 pre-amplifier installed). Distortion characteristics (RBW: 1 kHz): 2nd harmonic: >72.5 dB (10 to 200 MHz), >80 dB (200 to 500 MHz), >80 – f \[GHz\] dB (0.5 to 1.5 GHz), >82.5 – f \[GHz\] dB (0.8 to 1 GHz); 3rd order intermodulation: >80 dB (10 to 100 MHz), >83.3 dB (0.1 to 1 GHz), >83.3 – (2/3)f \[GHz\] dB (1 to 3 GHz) Sweep Sweep time Setting range: 20 ms to 1000 s (Manually settable, or automatically settable according to span, RBW and VBW); Accuracy: ±15% (20 ms to 100 s), ±45% (110 to 1000 s), ±1% (time domain sweep: digital zero span mode) Sweep mode Continuous, single Time domain sweep mode Analog zero span, digital zero span Zone sweep Sweeps only in frequency range indicated by zone marker Tracking sweep Sweeps while tracing peak points within zone marker (zone sweep also possible) Functions Number of data points 501 Detection mode NORMAL, POS PEAK, NEG PEAK, SAMPLE; Detection mode switching uncertainty: ±0.5 dB (at reference level) Display Color TFT-LCD, Size: 5.5 inch, Number of colors: 17 (RGB, each 64-scale settable); Intensity adjustment: 5 steps settable Display functions Trace A: Displays frequency spectrum; Trace B: Displays frequency spectrum; Trace Time: Displays time domain waveform at center frequency; Trace A/B; Trace A/BG; Trace A/Time; Trace move/calculation: A → B, B → A, A ↔ B, A + B → A, A – B → A, A – B + DL → A Storage functions NORMAL, VIEW, MAX HOLD, MIN HOLD, AVERAGE, CUMULATIVE, OVER WRITE FM demodulation waveform display function Demodulation range: 2, 5, 10, 20, 50, 100, 200 kHz/div; Marker display accuracy: ±5% of full scale (when referenced to center frequency, DC-coupled, RBW: 3 MHz, VBW: 1 Hz, CW) Input connector N-J, 50 Ω Auxiliary signal input and output IF OUTPUT: 10.69 MHz, BNC connector; VIDEO OUTPUT (Y): 0 to 0.5 V ±0.1 V (100 MHz, from lower edge to upper edge at 10 dB/div or 10%/div, 75 Ω terminated, BNC connector); COMPOSITE OUTPUT: For NTSC, 1 Vp-p (75 Ω terminated), BNC connector; EXT REF INPUT: 10 MHz ±10 Hz, ≥0 dBm (50 Ω terminated), BNC connector Signal search AUTO TUNE, PEAK → CF, PEAK → REF, SCROLL Zone marker NORMAL, DELTA Marker → MARKER → CF, MARKER → REF, MARKER → CF STEP SIZE, ΔMARKER → SPAN, ZONE → SPAN Peak search PEAK, NEXT PEAK, NEXT RIGHT PEAK, NEXT LEFT PEAK, MIN DIP, NEXT DIP Multimarker Number of markers: 10 max. (HIGHEST 10, HARMONICS, MANUAL SET) Measure Noise power (dBm/Hz, dBm/ch), C/N (dBc/Hz, dBc/ch), occupied bandwidth (power N% method, X-dB down method), adjacent channel power (REF: total power/reference level/in-band level method, channel designate display: 2 channels x 2 graphic display), average power of burst signal (average power in designated time range of time domain waveform), channel power (dBm, dBm/Hz), template comparison (upper/lower limits x each 2, time domain), MASK (upper/lower x each 2, frequency domain) Save/recall Saves and recalls setting conditions and waveform data to internal memory (max. 12) or memory card Hard copy Printer (HP dotmatrix, EPSON dotmatrix or compatible models): Display data can be hard-copied via RS-232C, GPIB, and Centronics (Option 10) interface; Plotter (HP-GL, GP-GL compatible models): Display can be output via RS-232C and GPIB interface PTA Language: PTL (interpreter based on BASIC); Programming: Using editor of external computer; Program memory: Memory card, upload/download to/from external computer; Programming capacity: 192 KB; Data processing: Directly accesses measurement data according to system variables, system subroutines, and system functions RS-232C Outputs data to printer and plotter. Control from external computer (excluding power switch) GPIB Meets IEEE488.2. Controlled by external computer (excluding power switch). Or controls external equipment with PTA. Interface function: SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, C1, C2, C3, C4, C28 Correction Automatic correction of insertion loss of MA1621A Impedance Transformer; Correction accuracy (RF ATT: ≥10 dB): ±2.5 dB (9 to 100 kHz), ±1.5 dB (100 kHz to 2 GHz), ±2.0 dB (2 to 3 GHz) \*Typical value. Antenna correction coefficients: Correct display and measurement of field strengths (dBµV/m) for specified antennas, Internal antenna correction coefficients (MP534A/651A Dipole Antenna, MP635A/666A Log-Periodic Antenna, MP414B Loop Antenna, and four antennas user-defined; writes via GPIB or RS-232C interface, saves/loads to/from memory card) Memory card interface Functions: Saving/recalling measurement parameters/waveform data, uploading/downloading PTA programs; Applicable cards: SRAM, EPROM, Flash EPROM \*Only SRAM writable; Card capacity: 2 MB max. Connector: Meets the PCMCIA Rel. 2.0, 2 slots Others EMC EN61326: 1997/A1, 1998 (Class A); EN61000-3-2: 1995/A2, 1998 (Class A); EN61326: 1997/A1, 1998 (Annex A) LVD EN61010-1: 1993/A2, 1995 (Installation Category II, Pollution degree 2) Vibration Meets the MIL-STD-810D Power (operating range) 85 to 132/170 to 250 Vac (automatic voltage switching), 47.5 to 63 Hz, 380 to 420 Hz (85 to 132 V only), ≤330 VA Dimensions and mass 320 (W) x 177 (H) x 351 (D) mm, ≤10.8 kg (without option) Ambient temperature 0° to +50°C (operate), –40° to +75°C (storage) **Important:** Maximum input level: +30 dBm CW average power (RF ATT ≥10 dB), ±50 Vdc.**Important:** Option 22 (75 Ω input) cannot be installed simultaneously with Options 12, 19, and 20.**Important:** Option 23 (75 Ω tracking generator) cannot be installed simultaneously with Options 12, 19, and 20.**Important:** Option 10 (Centronics interface) cannot be installed simultaneously with the GPIB interface.**Important:** Option 14 (PTA parallel I/O) cannot be installed when Option 10 is installed.**Important:** Option 12 (QP detector) requires Option 02 (Narrow Resolution Bandwidth).**Important:** Option 19 (DC coupled input) can only be installed with narrow RBW (Option 02).**Important:** Specified values are obtained after warming up the equipment for 30 minutes at a constant ambient temperature and then performing calibration. Typical values are given for reference and are not guaranteed.Recommended pairing: when interfacing the MS2661C to a 75 Ω system, use the MA1621A 50 Ω to 75 Ω Impedance Transformer (9 kHz to 3 GHz, ±100 V) named in the datasheet's ordering information. ## About this used unit - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **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.** ## Details - **Price:** 0.0 USD - 675.0 USD - **Vendor:** Anritsu - **Type:** Spec An - **Tags:** Analyzers, Anritsu, Manufacturers, product_manual_group_1, Product_used, Spectrum ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 525.00 USD | In stock | | NIST Traceable with Full Data | 600.00 USD | In stock | | ISO IEC 17025 Accredited | 675.00 USD | In stock | ## Images - Anritsu MS2661C 9 kHz to 3 GHz Portable Spectrum Analyzer (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/ms2661c-anritsu-spectrum-analyzer-used) > Updated: 2026-05-30