The Tektronix 492 is a high-performance, rugged, microprocessor-controlled portable spectrum analyzer. Designed for laboratory and field applications, it covers a wide frequency range from 50 kHz to 21 GHz (up to 220 GHz with optional waveguide mixers) and features automatic modes with a three-knob operation for simplified frequency span, resolution bandwidth, and reference level adjustments.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB (Option 08) |
| Display | Electrostatic CRT (Digital Storage available via Option 01) |
| Warm-Up Time | 2 hours (for specified frequency stability) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 90 to 132 VAC / 180 to 250 VAC, 48 to 440 Hz, 125 W (typical) |
| Operating Temperature | -15 to +55 °C |
| Dimensions (W×H×D) | 328 mm × 175 mm × 498 mm |
| Weight | 20 kg (44 lbs) |
Frequency Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 50 kHz to 21 GHz (up to 220 GHz with optional external waveguide mixers) |
| Frequency Span Range | 50 kHz/div to 500 MHz/div in 1-2-5 sequence plus Zero and Max Span (down to 100 Hz/div with Option 03) |
| Center Frequency Tuning Accuracy | +/-(5 MHz + 1% of center frequency) |
Resolution & Video Bandwidths
| Parameter | Value |
|---|---|
| Resolution Bandwidth (RBW) Range | 1 kHz to 1 MHz in decade steps |
| Resolution Bandwidth (RBW) Accuracy | Within 20% of selected bandwidth |
| Resolution Bandwidth (RBW) Shape Factor | 15:1 or better (60 dB to 6 dB bandwidth ratio) |
| Video Bandwidth (VBW) Range | Selectable Wide or Narrow noise filters |
Amplitude Specifications
| Parameter | Value |
|---|---|
| Maximum Input Power (Continuous Wave) | +30 dBm (1 Watt) with minimum 10 dB RF attenuation |
| Maximum DC Input Voltage | 0 V (DC coupled RF input) |
| Dynamic Range | 80 dB |
| Reference Level Range | -100 dBm to +30 dBm |
| Reference Level Steps | 10 dB and 1 dB steps |
| Input Attenuator Range | 0 to 60 dB |
| Input Attenuator Steps | 10 dB |
| Display Scale (Log) | 10 dB/div and 1 dB/div |
| Display Scale (Linear) | Linear scale selectable |
Sweep & Triggering
| Parameter | Value |
|---|---|
| Sweep Time Range | 20 us/div to 5 s/div in 1-2-5 sequence |
| Trigger Sources | Free Run, Internal (Video), Line, External |
Inputs, Outputs & Interfaces
| Parameter | Value |
|---|---|
| RF Input Connector Type | Type N female (50 ohm) |
| RF Input Impedance | 50 ohms |
| RF Input VSWR | < 1.3:1 up to 1.8 GHz |
| Calibrator Output (CAL OUT) Frequency | 100 MHz |
| Calibrator Output (CAL OUT) Amplitude | -20 dBm |
Display & Measurement Features
| Parameter | Value |
|---|---|
| CRT Display Type | Electrostatic deflection CRT with internal graticule |
| Baseline Clipper | Yes (removes intense baseline trace) |
| Save Reference Memory | Yes (with Option 01 Digital Storage) |
| Max Hold Mode | Yes (with Option 01 Digital Storage) |
| B-Minus-Save-A Mode | Yes (with Option 01 Digital Storage) |
Factory Options & Configurations
| Parameter | Value |
|---|---|
| Option 01 (Digital Storage) | Adds digital storage and trace manipulation |
| Option 02 (Internal Preselector) | Adds internal preselector for 1.7 GHz to 21 GHz bands |
| Option 03 (Phase Lock) | Adds phase lock and frequency stabilization |
| Option 08 (GPIB Capability) | Adds IEEE-488 (GPIB) remote control interface |
| External Waveguide Mixer Compatibility | Supports Tektronix WM490 series external mixers up to 220 GHz |
Power Specifications
| Parameter | Value |
|---|---|
| AC Input Voltage Range | 90 to 132 VAC / 180 to 250 VAC (rear panel selectable) |
| AC Input Frequency Range | 48 to 440 Hz |
Physical Characteristics
| Parameter | Value |
|---|---|
| Form Factor | Portable, ruggedized enclosure |
| Carrying Handle | Side-mounted adjustable carrying handle |
| Front Panel Cover | Snap-on protective front cover with storage space |
Environmental & Safety
| Parameter | Value |
|---|---|
| Storage Temperature Range | -62 °C to +85 °C |
| Operating Altitude | Up to 4,570 m (15,000 feet) |
Frequency
| Parameter | Value |
|---|---|
| Frequency Bands | Band 1: 50 kHz - 1.8 GHz; Band 2: 1.7 GHz - 5.5 GHz; Band 3: 3.0 GHz - 7.1 GHz; Band 4: 5.4 GHz - 12.0 GHz; Band 5: 12.0 GHz - 18.0 GHz; Band 6: 15.0 GHz - 21.0 GHz |
| First LO Frequency Range | 2.072 GHz to 3.872 GHz |
Performance
| Parameter | Value |
|---|---|
| Residual FM | ≤ 7 kHz p-p in 10 ms (without Option 03), ≤ 50 Hz p-p in 10 ms (with Option 03) |
| Residual Responses | ≤ -90 dBm (50 kHz to 1.8 GHz, 0 dB input attenuation) |
Inputs & Outputs
| Parameter | Value |
|---|---|
| External Reference Input Frequency | 100 MHz (Option 03) |
| Sweep Output Level | 0.5 V/div (0 to +5 V) |
| Video Output Level | 0.5 V/div |
Display
| Parameter | Value |
|---|---|
| CRT Graticule Size | 8 x 10 divisions |
| Digital Storage Horizontal Resolution | 1000 points (Option 01) |
| Digital Storage Vertical Resolution | 8 bits / 256 levels (Option 01) |
Environmental
| Parameter | Value |
|---|---|
| Environmental Compliance | MIL-T-28800C Type III, Class 3, Style C |
| EMC Compliance | MIL-STD-461A Part 4 |
Receiver Characteristics
| Parameter | Value |
|---|---|
| 1st Intermediate Frequency | 2072 MHz |
| 2nd Intermediate Frequency | 829 MHz |
| 3rd Intermediate Frequency | 10 MHz |
| Third-Order Intermodulation Distortion | ≤ -70 dBc for two -30 dBm input signals |
Spurious Responses
| Parameter | Value |
|---|---|
| LO Emission at RF Input | ≤ -30 dBm (standard) / ≤ -70 dBm (with Option 02 internal preselector) |
Display Performance
| Parameter | Value |
|---|---|
| Log Scale Display Accuracy | ±1.0 dB per 10 dB (maximum ±2.0 dB over 80 dB range) for 10 dB/div; ±0.4 dB over 16 dB range for 2 dB/div |
Options
| Parameter | Value |
|---|---|
| Option 07 (75 Ohm Input Impedance) | Replaces standard 50 Ohm RF input with 75 Ohm input for Band 1 (50 kHz to 1000 MHz) |
Technology
Superheterodyne Spectrum Analyzer
Applications
RF and Microwave Signal Analysis