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SPECTRUMANALYZERS

SPECTRUM ANALYZER

GPIB

MS2651B/2661B

9 kHz to 3 GHz

For Maintaining CATV Circuits

The MS2651B/2661B Portable Spectrum Analyzers are for use insignal analysis of radio and other equipment related to improving fre- quency usage efficiency, higher modulation, and digitalization. They are synthesized spectrum analyzers covering a wide frequency range from 9 kHz to 3 GHz. They have superior basic performance such as high C/N ratio, low distortion, and high frequency/level accuracies and are easy to operate. They have the “Measure” function for evaluation of radio equipment (frequency counter, C/N, adjacentchannel power, occupied frequency bandwidth, burst average power,and template decision function) and which enables the two-screen display and FM demodulation waveform display. The large selection of options means a wider range of applications can be handled at reasonable cost. The MS2661B is designed for manufacture and installation of radio equipment and devices, while the MS2651B is used for maintenance applications.

Specifications

Except where noted otherwise, specified values are obtained after warming up the equipment for 30 minutes at a constant ambient temper-ature and then performing calibration. The typical values are given for reference and are not guaranteed.

ModelMS2651BMS2661B Frequency range9 kHz to 3 GHz Display frequency accuracy ±(display frequency x reference frequency accuracy + span x span accuracy + 100 Hz)

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Span: ≥ 10 kHz, after calibration Marker frequency display Normal: Same as display frequency accuracy; Delta: Same as frequency span accuracyaccuracy Frequency counterResolution: 1 Hz, 10 Hz, 100 Hz, 1 kHzAccuracy: Display frequency x reference frequency accuracy ±1 LSD (at S/N: ≥ 20 dB) Setting range: 0 Hz, 1 kHz to 3.1 GHzSetting range: 0 Hz, 1 kHz to 3.1 GHzFrequency spanAccuracy: ±2.5% (span: ≥ 10 kHz)Accuracy:±2.5% (span: ≥ 10 kHz)±5% (span: <10 kHz, with option 02) Setting range:1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz, 300 kHz, 1 MHz, 5 MHz (manually settable, or automatically settable according Resolution bandwidth (RBW) to frequency span)

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Option 02 (MS2661B only): 30 Hz, 100 Hz, and 300 Hz are added.
Frequency (3 dB bandwidth) Measurements of noise, C/N, adjacent channel power, and channel power by measure function are executed with the calculated equivalent noise bandwidth of the RBW.Selectivity (60 dB : 3 dB): ≤ 10:1 (RBW: 1 to 300 kHz), ≤ 15:1 (RBW: 1, 5 MHz) Video bandwidth (VBW)1 Hz to 3 MHz (1-3 sequence), OFF (manually settable, or automatically settable according to RBW) Noise sideband: ≤ –90 dBc/Hz (1 GHz, 10 kHz offset)Noise sideband: ≤ –100 dBc/Hz (1 GHz, 10 kHz offset) Noise sideband, stabilityResidual FM: ≤ 20 Hzp-p/0.1 s (1 GHz, span: 0 Hz) Frequency drift: ≤ 200 Hz/min (span: ≤ 10 kHz, sweep time: ≤ 100 s)

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After 1 hour warm-up at constant ambient temperature Frequency: 10 MHzReference oscillatorAging rate: 2 x 10
–6 /year (typical); Option 01: 1 x 10
–7 /year, 2 x 10
–8 /dayTemperature characteristics: 1 x 10
–5 (typical, 0 to +50°C); Option 01: ±5 x 10
–8 (0 to +50°C, referenced to 25°C) Continued on next page

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