# Anritsu MS2601B 9 kHz–2.2 GHz Spectrum Analyzer, 50 Ω Input (Pre-Owned)

# Anritsu MS2601B 9 kHz–2.2 GHz Spectrum Analyzer, 50 Ω Input (Pre-Owned)

## Key Features At A Glance

-   9 kHz to 2.2 GHz coverage spanning the video, VHF, and UHF bands
-   GPIB (IEEE-488) interface standard for ATE integration; RS-232C available as Option 02
-   Built-in automatic calibration from an internal signal source via the CAL key for ±1 dB overall level accuracy
-   1 Hz frequency-count resolution even at a full 2.2 GHz span sweep
-   Zone marker and frequency-axis scroll functions developed to shorten measurement time
-   Plug-in IC memory cards (PMCs) store measurement conditions and waveform data
-   QP detector with CISPR-based resolution bandwidths and automatic antenna correction for EMI measurement
-   Available with 50 Ω N-type (MS2601B) or 75 Ω NC-type (MS2601K) RF input

The Anritsu MS2601B/K is a wide-band spectrum analyzer covering 9 kHz to 2.2 GHz, spanning the video through VHF/UHF bands. A synthesized local oscillator together with automatic calibration from a built-in, highly accurate signal source enables accurate frequency and level measurement. Original functions such as the zone marker and scroll function shorten measurement time, and plug-in memory cards (PMCs) store measurement conditions and waveform data for repeatable operation.

The instrument is intended for measuring transmission quality such as spurious emissions from radio communication equipment, measuring electromagnetic interference (EMI), testing high-frequency parts such as RF converters and tuners, and measuring various devices such as filters and ICs. Each pressing of the CAL key recalibrates the analyzer against its internal signal source, so accurate measurements can be made even when the working temperature changes drastically.

ValueTronics stocks and holds its own test-and-measurement inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, so the instruments we list are equipment we keep on hand. Every pre-owned order ships from that facility; each pre-owned unit is inspected and functionally verified in-house against the manufacturer's specifications before it leaves, while new units ship factory-sealed exactly as received.

## Compare Other Models in This Series

The MS2601B/K is offered as two main-frame models that share the same 9 kHz to 2.2 GHz spectrum-analyzer architecture, automatic calibration, zone marker and scroll functions, and PMC memory-card operation. The models are distinguished primarily by their RF input: the MS2601B presents a 50 Ω input, and the MS2601K presents a 75 Ω input.

Both models accept the same option set, including PTA (Options 01/04), the RS-232C interface (Option 02), and the frequency-range extension to 100 Hz (Option 05), so the choice between them is driven mainly by the impedance and connector required for the device under test.

Each model below links to its own dedicated product page with condition-matched pricing for the pre-owned configuration you select. Choose the impedance variant that matches your application, then pick the condition and options on that model's page.

The two models differ in their RF input section. The MS2601B uses a 50 Ω input on an N-type connector with a DC maximum input level of ±50 V, while the MS2601K uses a 75 Ω input on an NC-type connector with a DC maximum input level of ±100 V; both share a +25 dBm RF maximum at input ATT ≥ 10 dB and VSWR ≤ 1.5.

Level-related figures such as average noise level, frequency response, and LOG measurement range carry separate values for the 50 Ω and 75 Ω inputs, and Option 05 extends each model's lower frequency limit to 100 Hz using the MA8601A (MS2601B) or MA8601J (MS2601K) DC block adapter. The comparison table that follows lists each model's specific values side by side.

Model

Frequency Range

Input Impedance

Connector

**MS2601B**

9 kHz to 2.2 GHz

50 Ω

N-type

MS2601K

9 kHz to 2.2 GHz

75 Ω

NC-type

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

## Accessories Supplied

-   J0025A Coaxial cord, N-P-5W • 5D-2W • N-P-5W, 1 m: 1 pc
-   J0104 Coaxial cord, UG-88U • RG55/U • N-P-55U, 1 m: 1 pc
-   J0017 Power cord, 2.5 m: 1 pc
-   F0012 Fuse, 3.15 A: 2 pcs
-   P0005 Memory card, 32 KB: 1 pc
-   MS2601B/K operation manual: 1 copy
-   MS2601B/K service manual: 1 copy

## Product Core & Specifications

Specification

Value

Frequency

Measurement frequency range

9 kHz to 2.2 GHz

Frequency setting

0 to 2210 MHz (stop frequency: ≥1 kHz)

Display resolution

20 Hz

Setting mode

CENTER/SPAN, START/SPAN, START/STOP; set frequency span (stop freq. – start freq.) to 2-digit value (10 to 98)

Frequency display accuracy

±(100 Hz + freq. span × 2% + display freq. × reference freq. accuracy), for CENTER/SPAN or START/SPAN mode after auto-calibration, provided freq. span ≥10 kHz and sweep time ≤100 s

Frequency span — setting range

1 kHz to 2200 MHz for horizontal 10 divisions, 2-digit (10 to 98) variable, and 0 Hz (fixed tuning)

Frequency span — resolution

1 kHz to 2000 MHz, 1-2-5 sequence at step keys

Frequency span — readout accuracy

±2% (sweep time ≤100 s)

Resolution bandwidth

30 Hz to 1 MHz (3 dB bandwidth), variable in 1-3 sequence, manual or automatically coupled to frequency span

Resolution bandwidth accuracy

±20%

Selectivity

≤15 : 1 (ratio of 60 dB and 3 dB bandwidth)

Stability — residual FM

≤20 Hz p-p/0.1 s (frequency span ≤500 kHz)

Stability — drift

≤300 Hz/min (frequency span ≤500 kHz, sweep time ≤100 s, after 1-hour warm-up at constant ambient temperature)

Sideband noise

≤–80 dBc (at 100 Hz resolution bandwidth, 1 Hz video bandwidth, 10 kHz from signal)

Reference oscillator

Frequency

10 MHz

Stability — starting characteristic

Within ±5 × 10⁻⁸ (after 20-minute warm-up, referred to frequency after 1-hour warm-up)

Stability — aging rate

Within ±2 × 10⁻⁸/day, ≤1 × 10⁻⁷/year (referred to frequency after 24-hour warm-up)

Stability — temperature characteristic

Within ±5 × 10⁻⁸ (referred to frequency at 25°C)

External reference input

Frequency: 10 MHz, Level: 2 to 5 Vp-p

Markers

Normal

Displays frequency at tunable marker; display accuracy same as center frequency display accuracy

Delta

Displays frequency difference between reference marker and tunable marker; display accuracy same as frequency span display accuracy

Count

Displays received signal frequency at marker; resolution 1 Hz, 10 Hz, 100 Hz selectable; accuracy display frequency × reference frequency accuracy ±(2 counts or 20 Hz, whichever is greater)

Amplitude

Measurement range

–130 to +20 dBm

Display divisions

8 divisions on vertical axis when top line is reference level and scale is 10 dB/div; 10 divisions on vertical axis for other scales

Display — LOG (referred to reference level)

0 to –70 dB (10 dB/div), 0 to –50 dB (5 dB/div), 0 to –20 dB (2 dB/div), 0 to –10 dB (1 dB/div)

Display — LIN

10%/div of reference level (calibrated in voltage, unit: V)

Linearity — LOG

±0.2 dB/0 to –10 dB, ±0.3 dB/0 to –20 dB, ±0.5 dB/0 to –50 dB (resolution bandwidth 100 Hz to 1 MHz), ±1 dB/0 to –70 dB (resolution bandwidth 100 Hz to 100 kHz), after automatic calibration

Linearity — LIN

±3% of reference level (fullscale)

Frequency response (20° to 30°C)

±0.5 dB (100 kHz to 2.0 GHz), ±1.5 dB (9 kHz to 2.2 GHz), input ATT at 20 dB

Reference level — setting range

LOG: +20 to –100 dBm (setting resolution 0.1 dB), 2240 mV to 2.20 µV; LIN: 2240 mV to 70.8 µV

Reference level — accuracy

±0.3 dB (0 to –50 dBm), ±0.75 dB (+20 to –70 dBm) after automatic calibration at frequency of 50 MHz and frequency span ≤2 MHz (resolution bandwidth, video bandwidth, sweep time, and input ATT settings at AUTO)

Resolution bandwidth switching deviation

±0.3 dB (after automatic calibration)

Average noise level

≤–120 dBm (frequency 1 MHz to 2 GHz) with 0 dB input ATT, 300 Hz resolution bandwidth, 1 Hz video bandwidth

2nd and 3rd harmonic distortion

≤–75 dB (frequency 5 to 800 MHz) when 0 dB input ATT and –30 dBm input level

Residual response

≤–100 dBm (frequency ≥500 kHz) when 0 dB input ATT and 50 Ω input termination

Marker — normal

Displays the level at settable marker

Marker — delta

Displays the difference in levels between the settable marker and the reference marker

Marker — noise measurement

Both the power of noise per 1 Hz bandwidth (dBm/Hz, dBc/Hz) and the adjacent channel power (dBm/ch, dBc/ch) can be measured

Video bandwidth

1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz, OFF (selected manually or automatically coupled to resolution bandwidth)

Level unit

dBm, dBµV, dBmV, dBµV (emf), dBµV/m

LOG/LIN switching loss

≤±1 dB (after calibration at room temperature)

Quasi-peak detection — 6 dB bandwidth

200 Hz, 9 kHz, 120 kHz ±30% (at room temperature)

Quasi-peak detection — charge-time constant

45 ms (for 6 dB bandwidth at 200 Hz), or 1 ms (for 6 dB bandwidth at 9 kHz and 120 kHz)

Quasi-peak detection — discharge-time constant

500 ms (for 6 dB bandwidth at 200 Hz), 160 ms (for 6 dB bandwidth at 9 kHz), or 550 ms (for 6 dB bandwidth at 120 kHz)

Quasi-peak detection — display time constant

160 ms (for 6 dB bandwidth at 200 Hz and 9 kHz), or 100 ms (for 6 dB bandwidth at 120 kHz)

Quasi-peak detection — display

LOG scale; 5 dB/div (10 div)

Quasi-peak detection — linearity

±1 dB (for –40 to 0 dB carrier wave signal, at room temperature)

Field strength measurement

Antenna correction coefficients stored in memory for MP534A/651A, MP635A/666A, MP414B; user may define and store antenna coefficients (for one antenna) via the GPIB interface

RF input

Impedance

50 Ω, VSWR ≤1.5 (input ATT ≥10 dB, frequency ≥30 kHz), N-type connector

Maximum input level

+25 dBm (input ATT ≥10 dB), DC: ±50 V

Input ATT — attenuation

0 to 50 dB, in 10 dB steps (selected manually or automatically coupled to reference level)

Input ATT — switching accuracy

±1 dB (100 kHz to 1.5 GHz), ±2.0 dB (9 kHz to 2.2 GHz)

Sweep

Sweep time — setting range

50 ms to 1000 s variable in 1-1.5-2-3-5-7 sequence; range selected manually or automatically according to frequency span, resolution bandwidth, and video bandwidth; can also be set from 50 ms to 1000 s (most significant 2 digits) via the GPIB interface

Sweep time — accuracy

≤±15% (for 50 ms to 100 s range) or ≤±30% (for 100 to 1000 s range) at room temperature

Trigger

FREE RUN, LINE, VIDEO, SINGLE, EXT TRIGGER

Sweep range — normal

Sweeps entire range, zone marker width setting range 1 to 501 points (odd numbers)

Sweep range — zone sweep

Sweeps range between zone markers, zone marker width setting range 25 to 501 points (odd numbers)

CRT display

CRT

Six-inch electromagnetic deflection type (green display color)

Display items

Graticule (grid), waveform data, setting conditions, menu, title

> **Important:** Specify one nominal line voltage between 100 and 240 V when ordering; maximum operational voltage is 250 V.

> **Important:** Y-axis outputs are not automatically calibrated, so their amplitude specifications are not guaranteed.

> **Important:** Option 07 (AM/FM Modulator) cannot be installed simultaneously with Option 09 (Tilt Handle).

> **Important:** Option MS2601-05 (frequency range extension to 100 Hz to 2.2 GHz) requires the MA8601A DC Block Adapter on the MS2601B or the MA8601J DC Block Adapter on the MS2601K.

> **Important:** Antennas required for field-strength / EMI (dBµV/m) measurement are not included with the base unit; the appropriate antenna (e.g., MP534A/651A dipole, MP635A/666A log-periodic, or MP414B loop) must be ordered separately from the optional instruments and parts list.

## About this Pre-Owned unit

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.

-   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).

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.**

## 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 MS2601B 9 kHz–2.2 GHz Spectrum Analyzer, 50 Ω Input (Pre-Owned)

---

> Source: [ValueTronics](https://valuetronics.com/products/ms2601b-anritsu-spectrum-analyzer-used)
> Updated: 2026-07-06