FSMR26

The Rohde & Schwarz FSMR26 is a high-precision measuring receiver designed for calibrating signal generators and attenuators. Combining the functionality of a high-accuracy level calibrator, a wide-range power meter, an analog modulation analyzer, and a high-performance spectrum analyzer, it operates over a frequency range from 20 Hz to 26.5 GHz. It is engineered to meet the demanding requirements of calibration laboratories and metrology environments.

Calibration Metrology RF and Microwave Spectrum Analysis

Specifications

General

Parameter	Value
Interfaces	GPIB (IEEE-488.2), LAN (10/100 Base-T), USB 2.0, RS-232, VGA, PS/2
Display	21 cm (8.4 in) TFT color LCD, SVGA (800 x 600 pixels)
Warm-Up Time	20 min (for specified accuracy)

Physical

Parameter	Value
Power Supply	100 V to 240 V AC, 50 Hz to 400 Hz, typ. 150 W
Dimensions (W×H×D)	435 mm × 192 mm × 460 mm
Weight	24 kg

Frequency and Reference Characteristics

Parameter	Value
Frequency Range	20 Hz to 26.5 GHz
Frequency Resolution	0.01 Hz
Internal Reference Frequency	10 MHz
Reference Frequency Aging Rate	1 × 10^-9 per day (after 30 days of operation)
Reference Frequency Year Aging Rate	1 × 10^-7 per year
External Reference Input Frequency	1 MHz to 20 MHz (in 1 Hz steps)
External Reference Input Level	–10 dBm to +13 dBm
Reference Output Frequency	10 MHz
Reference Output Level	0 dBm (nominal)

RF Input and Attenuation

Parameter	Value
RF Input Connector Type	APC 3.5 mm female
RF Input Impedance	50 Ω
RF Input VSWR (with 10 dB attenuation, < 3.6 GHz)	< 1.15
RF Input VSWR (with 10 dB attenuation, 3.6 GHz to 26.5 GHz)	< 1.50
Maximum Safe RF Input Power	30 dBm (1 W) continuous
Maximum Safe DC Input Voltage	0 V
Internal Attenuator Range	0 dB to 75 dB
Internal Attenuator Step Size	5 dB

Tuned RF Level (TRFL) Measurements

Parameter	Value
TRFL Measurement Range	–130 dBm to +30 dBm
TRFL Resolution	0.001 dB
Linearity Uncertainty	±(0.01 dB + 0.005 dB per 10 dB step)

RF Power Meter Characteristics

Parameter	Value
Compatible Power Sensors	R&S NRP-Z series (including NRP-Z11, NRP-Z21, NRP-Z51)
Power Sensor Connectors	2 ports (front panel, dedicated R&S NRP sensor ports)
Internal Power Reference Frequency	50 MHz
Internal Power Reference Level	1.00 mW (0 dBm)
Internal Power Reference Accuracy	±1.2% (1 year calibration interval)
Power Reference Connector Type	N female (front panel)

Analog Modulation Analysis

Parameter	Value
AM Depth Range	0% to 100%
FM Deviation Range	up to 3 MHz
FM Rate Range	20 Hz to 200 kHz
FM Measurement Accuracy	±1% of reading
Phase Modulation Deviation Range	up to 1000 rad
Phase Modulation Rate Range	20 Hz to 100 kHz
Residual AM (0.3 kHz to 3 kHz BW)	< 0.05%
Residual FM (0.3 kHz to 3 kHz BW, 1 GHz carrier)	< 1 Hz

Audio and Distortion Analysis

Parameter	Value
Audio Frequency Range	20 Hz to 250 kHz
Audio Input Impedance	1 MΩ
Audio Input Connector	BNC female (front panel)
Audio Distortion Measurement Range (THD)	0.005% to 50%
SINAD Measurement Range	10 dB to 80 dB
Demodulated Audio Low-Pass Filters	3 kHz, 15 kHz, 23 kHz, 150 kHz
Demodulated Audio De-emphasis	50 µs, 75 µs, 750 µs

Spectrum Analyzer Mode

Parameter	Value
Spectrum Analyzer Frequency Range	20 Hz to 26.5 GHz
Spectrum Analyzer Resolution Bandwidths	10 Hz to 10 MHz (1-3-10 sequence)
Spectrum Analyzer Video Bandwidths	1 Hz to 10 MHz (1-3-10 sequence)
FFT Filter Bandwidths	1 Hz to 30 kHz
Displayed Average Noise Level (1 GHz, 10 Hz RBW)	–150 dBm (typical)
SSB Phase Noise (1 GHz carrier, 10 kHz offset)	–128 dBc (1 Hz)
SSB Phase Noise (10 GHz carrier, 10 kHz offset)	–114 dBc (1 Hz)

Connectivity and Remote Control

Parameter	Value
GPIB Controller Interface	IEEE-488.2 (rear panel)
GPIB Device Interface	IEEE-488.2 (rear panel)
LAN Interface	10/100 Base-T (RJ-45)
USB Ports	USB 2.0 (front and rear panels)
External Monitor Output	VGA (15-pin D-Sub)
External Trigger Input	BNC female (rear panel)
IF Output	BNC female (rear panel)
Video Output	BNC female (rear panel)

Physical and Electrical Specifications

Parameter	Value
AC Input Voltage Range	100 V to 240 V AC (nominal)
AC Input Frequency Range	50 Hz to 400 Hz
Power Consumption	150 W (typical), 250 W (maximum)
Form Factor / Height	19-inch rackmount (4 HU)

Environmental and Compliance

Parameter	Value
Storage Temperature Range	–40 °C to +70 °C
Safety Compliance Standards	EN 61010-1, UL 61010B-1, IEC 61010-1
Electromagnetic Compatibility (EMC)	EN 55011 Class B, EN 61326-1
Recommended Calibration Interval	1 year

Spectrum Analyzer

Parameter	Value
1 dB Compression Point	+13 dBm (at 0 dB RF attenuation, f > 10 MHz)
Third-Order Intercept (TOI)	> 20 dBm (typ. +25 dBm, f > 100 MHz)
Sweep Time Range (Span >= 10 Hz)	2.5 ms to 16000 s
Sweep Time Range (Zero Span)	1 µs to 16000 s
Number of Sweep Points	155 to 30001

Modulation Analysis

Parameter	Value
Analog Demodulation Modes	AM, FM, PM

Interfaces & Control

Parameter	Value
HP 8902A Emulation	Supported (via GPIB command emulation)

Display & System

Parameter	Value
Display Screen Size	21 cm (8.4 in)
Display Resolution	800 × 600 pixels (SVGA)
Operating System	Windows XP Embedded

Reference Frequency Options

Parameter	Value
OCXO Daily Aging Rate (Option B4)	1 × 10^-10 per day (after 30 days of continuous operation)
OCXO Temperature Stability (Option B4)	1 × 10^-9 (0 °C to +50 °C)

Options & Accessories

Parameter	Value
RF Preamplifier Gain (Option B23)	20 dB (nominal, 100 kHz to 26.5 GHz)
Electronic Attenuator Range (Option B25)	0 dB to 30 dB (in 5 dB steps)
Removable Hard Disk Option	Option FSMR-B18

Performance - Spectrum Analyzer

Parameter	Value
Resolution Bandwidth (RBW) Range (Standard)	10 Hz to 50 MHz
Resolution Bandwidth (RBW) Range (FFT Filters)	1 Hz to 30 kHz
Video Bandwidth (VBW) Range	1 Hz to 10 MHz

Environmental & Physical

Parameter	Value
Operating Humidity	95% relative humidity (+25 °C / +40 °C, cyclic, IEC 60068-2-30)
Vibration Resistance (Sinusoidal)	5 Hz to 55 Hz (0.15 mm amplitude), 55 Hz to 150 Hz (0.5 g acceleration, IEC 60068-2-6)

Technology

Superheterodyne Receiver

Applications

Metrology, Signal Generator and Attenuator Calibration