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[[File:Tek 492 3.jpg|thumb|400px|right|Tektronix 492AP]]
{{Instrument Sidebar
The '''Tektronix 492''' is a portable, stand-alone Spectrum Analyzer introduced in 1980 that covers 50 kHz to 21 GHz.
|class=Spectrum Analyzer
|manufacturer=Tektronix
|model=492
|summary=21 GHz Spectrum Analyzer
|image=Tek 492 3.jpg
|caption=Tektronix 492
|introduced=1980
|discontinued=1993
|designers=
|manuals=
'''492/492P'''
* [[Media:070-2729-00.pdf|Tektronix 492(P) Operators Handbook]]
* [[Media:070-2726-02.pdf|Tektronix 492(P) Operator Manual -02]] (OCR)
* [[Media:070-2726-03.pdf|Tektronix 492(P) Operator Manual -03]] (OCR)


492P and AP/BP have a [[GPIB interface]].
* [[Media:070-2727-03.pdf|Tektronix 492(P) (SN B029999 & below) Service Volume 1]]
* [[Media:070-3783-01.pdf|Tektronix 492(P) Service Manual – Volume 1]]
* [[Media:070-3784-01.pdf|Tektronix 492(P) Service Manual – Volume 2]]


{{MissingSpecs}}
* [[Media:070-3401-00.pdf|Tektronix 492P Programmers Manual]] (OCR)


==Manuals==
'''492A/492AP/492BP'''
* [http://w140.com/tek_492_service_vol1.pdf Tektronix 492 Service Manual Volume 1 (PDF)]
* [[Media:070-5562-01.pdf|Tektronix 492A(P) Operators Manual -01]]
* [http://w140.com/tek_492_service_vol2.pdf Tektronix 492 Service Manual Volume 2 (PDF)]
* [[Media:070-5562-00.pdf|Tektronix 492A(P) Operators Manual -00]]
* [[Media:070-5566-01.pdf|Tektronix 492A(P) Service Manual Vol.2]]
 
* [[Media:070-5564-01.pdf|Tektronix 492AP/492BP Programmers Manual]]
'''Modifications'''
* [[Media:050-1467-01.pdf|Product modification – Variable Resolution Module Replacement]]
'''Specifications'''
* [[Media:Tek_492_Catalog_Spec_1980.pdf|Tektronix 492 Introduction Spec]] (OCR)
* [[Media:Tek_490-Series_Final Spec_1991.pdf| Tektronix 492 Final Spec]] (OCR)
}}
The '''Tektronix 492''' is a spectrum analyzer with a frequency range of 10 kHz to 21 GHz in coax, and up to 325 GHz with external waveguide mixers (492PGM N/A).  The '''P''' suffix designation indicates GPIB '''P'''rogrammability.  The minimum resolution bandwidth is 100 Hz, and provides measurement resolution proportional to the frequency accuracy or span.  With non-volatile memory (NVRAM) you can save up to 9 waveform displays, up to 10 complete front panel measurement parameter setups, and 8 K for programming macros of commonly used routines.
 
During the lifespan of the instrument the specifications and included options were altered several times. A major upgrade was the introduction of the '''492A''' in 1987 which added marker functionality and resolution bandwidths and the '''492BP''' in 1989 which added a counter and increased the displayed dynamic range. The '''492PGM''' is a cost reduced version introduced in 1990. Also see [[49X Series Comparison]].
 
{{BeginSpecs}}
{{Spec | Frequency |
* Coaxial Input Bands: 10 kHz to 21 GHz
* External Waveguide mixers: 10 kHz to 325 GHz (applies to 492BP not 492PGM) }}
{{Spec | Frequency Span (plus 0 Hz and MAX) | 492BP: 100 Hz/div to 10 GHz/div; 492PGM: 200 MHz to 1 GHz; both in 1, 2, 5 sequence }}
{{Spec | Resolution Bandwidth (-6 dB bandwidth) | 492BP: 100 Hz to 3 MHz; 492PGM: 1 kHz to 3 MHz; both in decade steps }}
{{Spec | RF Input impedance | 50 Ω }}
{{Spec | Maximum Safe Input Power | CW: +30 dBm (1 W); Pulse: 75 W Pk (1 µS pulse, 0.1% duty factor) }}
{{Spec | RF Attenuator | 0 dB to 60 dB, 10 dB steps }}
{{Spec | Reference Level | -117 dBm to +30 dBm }}
{{Spec | Sweep Speed | 10 sec/div to 20 µs/div in 1, 2, 5 sequence }}
{{Spec | Video Bandwidth | 492BP: 0.3 Hz to 30 kHz; 492PGM: 3 Hz to 30 kHz }}
{{Spec | Triggering Modes | Free Run, Line, Video, Single, External }}
{{Spec | Displayed Average Noise | −30 dBm to −131 dBm }}
{{Spec | Display Dynamic Range | 492BP: 90 dB; 492PGM: 80 dB }}
{{Spec | Calibrator (Cal out) | 50Ω, -20 dBm ±0.3 dB at 100 MHz }}
{{Spec | Included Accessories | Operator’s Manual; Programmer Manual; 6-ft 50Ω coaxial cable N-N; 18-inch 50 Ω coaxial cable BNC-BNC; N male to BNC female adapter; rear connector shield; Power Cord; spare fuses; CRT filter set consisting of amber and gray light filters plus mesh filter, 492PGM includes gray CRT filter (no filter set) }}
{{Spec | Weight | 492BP: 21.76 kg (47 lbs) 492PGM: 21.3 kg (46 lbs) }}
{{Spec | Power | 90 − 132 V<sub>AC</sub>, 48 to 440 Hz; 180 – 250 V<sub>AC</sub>, 48 to 440 Hz.  At 115 V<sub>AC</sub>, 60 Hz, 210 W max }}
{{Spec | Operating Atmospherics | Temperatures: -15 °C to +55 °C;  Humidity: Five cycles (120 hours) MIL-STD-810; Altitude: Up to 4.6 km (15,000 ft) }}
{{Spec | GPIB Characteristics | In accordance with IEEE Standard 488-1978 implemented as SH1, AH1, T5, L3, SR1, RL1, PP1, DC1, DT1, and C0 }}
{{EndSpecs}}


==Options==
==Options==
* Option 1: Digital memory
* Opt. 01: Internal Preselection. (Limits the first band to 1.8 GHz instead 4.2 GHz). Later became standard
* Option 2: Pre-selector
* Opt. 02: Digital Storage. Later became standard
* Option 3: Phase lock at narrow spans
* Opt. 03: Frequency Stabilization & 100 Hz Resolution. Later became standard
* Opt. 07: 75Ω dBmV input and calibration in addition to the normal 50Ω dBm input and calibration.  (Not combinable with Opt. 21 and 22; no external mixer capability).  Include 42-inch 75Ω BNC-BNC coax cable and BNC male to “F” female adapter.
* Opt. 21: (492BP) High performance 18 to 40 GHz WM490 Series Waveguide Mixer Set
* Opt. 22: (492BP) Same as Opt. 21 plus WM490U (40-60 GHz) Waveguide Mixer
* Opt. 23: GRASP software, PC2A interface, and GPIB cable
* Opt. 27: Epson LT-386SX, GRASP software, PC2A interface, and GPIB cable
* Opt. 28: Compaq Deskpro 386S, Model 40, GRASP software, PC2A interface, and GPIB cable
* Opt. 39: Non-lithium (Silver) batteries for battery-backed memory
* Opt. 41: Digital Microwave Radio Measurement Enhancement package
* Opt. 42: Replaces MARKER/VIDEO input port on the rear panel with a 110 MHz IF output port that provides a 3 dB signal bandwidth ≥ 4.5 MHz
* Opt. 45: (all except 492PGM) MATE/CIIL language interface


==Links==
==Links==
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* [http://softsolder.com/2009/07/31/tektronix-492-spectrum-analyzer-backplane-pin-spacing/ ROM replacement]
* [http://softsolder.com/2009/07/31/tektronix-492-spectrum-analyzer-backplane-pin-spacing/ ROM replacement]
* [https://www.circuitben.net/node/4 Tek 492 DIY USB interface project]
* [https://www.circuitben.net/node/4 Tek 492 DIY USB interface project]
* [[016-0631-01|Waveguide Mixers for 492 and 7L18]]
* [https://www.youtube.com/watch?v=tKC24SpHTSY YouTube: Tektronix 492 and 496 Portable Spectrum Analyzers]
* [[067-1137-99|067-1137-99 GPIB to accessory controller]]
==Connections==
Front panel inputs/outputs are:
* RF INPUT (50 Ω [[N connector]]) – Input for RF signals to 21 GHz.  If input signal has a DC component, use a blocking capacitor
* CAL OUT ([[BNC connector]]) – Provides 100 MHz, –20 dBm signal and a comb of frequency markers 100 MHz apart
* 1ST LO OUTPUT ([[SMA connector]]) – Output of the 1st local oscillator, must be terminated into 50 Ω when not connected.
* 2ND LO OUTPUT ([[SMA connector]]) – Output of the 2nd local oscillator, must be terminated into 50 Ω when not connected.
* EXTERNAL MIXER RF INPUT ([[TNC connector]], 50 Ω)
* Camera Power
Rear panel inputs/outputs are:
* PROBE POWER – Provides operating voltages (+5 V, -15 V, +15 V; 100 mA max each) for active probes
* HORIZ/TRIG (input, [[BNC connector|BNC]]) – In External Triggering mode, AC coupled input for trigger signals; when TIME/DIV selection is EXT, DC coupled input for horizontal sweep voltages
* MARKER/VIDEO (B053575+, output, [[BNC connector|BNC]]) – interfaces the 492/492P with a TV Sideband Adapter, such as the Tek [[1405]], so a marker from the adapter is displayed on the internal video.  External video applied to this connector will also be displayed if pin 1 of the ACCESSORIES connector is grounded. 
** Opt. 42 replaces MARKER/VIDEO with 110 MHz IF (output, [[BNC connector|BNC]]) – 3 dB signal bandwidth ≥ 4.5 MHz
* EXT PRESELECTOR (B053574 and below) (output, [[BNC connector|BNC]]) – variable voltage (approx -0.2 V to +10 V) proportional to center frequency, for preselector bands of Opt. 01 instruments, to drive an external preselector
* HORIZ (output, [[BNC connector|BNC]]) – 0.5 V/div horizontal signal
* VERT (output, [[BNC connector|BNC]]) – Video signal with 0.5 V/Div
* PEN LIFT (output, [[BNC connector|BNC]]) – TTL compatible signal to lift the pen of a chart recorder during sweep retrace.  In Opt. 42 instruments this port may also be used for inputting external video if pin 1 of the ACCESSORY connector is grounded.
* 10 MHz IF (output, [[BNC connector|BNC]]) – Output of the 10 MHz IF
* J104 ACCESSORY (B053575+ only), female [[DB25 connector]] – Provides bidirectional access to the instrument bus.
* IEEE STD 488 PORT [[GPIB interface]] – Added to all "P" suffixed instruments


==Pictures ==
==Pictures==
===492===
<gallery>
Tek 492 trace open.jpg
Tek 492 top internal.jpg|Internal top view
</gallery>
 
===492A===
<gallery>
<gallery>
Tek 492 3.jpg
Tek 492 3.jpg
Line 31: Line 124:
Tek 492 7.jpg
Tek 492 7.jpg
Tek 492 8.jpg
Tek 492 8.jpg
Tek 492 top internal.jpg|Internal top view
Tek 492 trace open.jpg
</gallery>
</gallery>


[[Category:Spectrum Analyzers]]
===492BP===
[[Category:GPIB interface]]
<gallery>
[[Category:Specifications needed]]
492BP_ebay_1.jpg
[[Category:Introduced in 1980]]
492BP_ebay_2.jpg
[[Category:Description needed]]
492BP_ebay_3.jpg
492BP_ebay_4.jpg
492BP_ebay_5.jpg
</gallery>
 
===492PGM===
<gallery>
492PGM_front.jpg
</gallery>
 
[[Category:Spectrum analyzers]]
[[Category:Manual needed]]

Revision as of 05:43, 15 October 2022

Manuals – Specifications – Links – Pictures

The Tektronix 492 is a spectrum analyzer with a frequency range of 10 kHz to 21 GHz in coax, and up to 325 GHz with external waveguide mixers (492PGM N/A). The P suffix designation indicates GPIB Programmability. The minimum resolution bandwidth is 100 Hz, and provides measurement resolution proportional to the frequency accuracy or span. With non-volatile memory (NVRAM) you can save up to 9 waveform displays, up to 10 complete front panel measurement parameter setups, and 8 K for programming macros of commonly used routines.

During the lifespan of the instrument the specifications and included options were altered several times. A major upgrade was the introduction of the 492A in 1987 which added marker functionality and resolution bandwidths and the 492BP in 1989 which added a counter and increased the displayed dynamic range. The 492PGM is a cost reduced version introduced in 1990. Also see 49X Series Comparison.

Key Specifications

Frequency
  • Coaxial Input Bands: 10 kHz to 21 GHz
  • External Waveguide mixers: 10 kHz to 325 GHz (applies to 492BP not 492PGM)
Frequency Span (plus 0 Hz and MAX) 492BP: 100 Hz/div to 10 GHz/div; 492PGM: 200 MHz to 1 GHz; both in 1, 2, 5 sequence
Resolution Bandwidth (-6 dB bandwidth) 492BP: 100 Hz to 3 MHz; 492PGM: 1 kHz to 3 MHz; both in decade steps
RF Input impedance 50 Ω
Maximum Safe Input Power CW: +30 dBm (1 W); Pulse: 75 W Pk (1 µS pulse, 0.1% duty factor)
RF Attenuator 0 dB to 60 dB, 10 dB steps
Reference Level -117 dBm to +30 dBm
Sweep Speed 10 sec/div to 20 µs/div in 1, 2, 5 sequence
Video Bandwidth 492BP: 0.3 Hz to 30 kHz; 492PGM: 3 Hz to 30 kHz
Triggering Modes Free Run, Line, Video, Single, External
Displayed Average Noise −30 dBm to −131 dBm
Display Dynamic Range 492BP: 90 dB; 492PGM: 80 dB
Calibrator (Cal out) 50Ω, -20 dBm ±0.3 dB at 100 MHz
Included Accessories Operator’s Manual; Programmer Manual; 6-ft 50Ω coaxial cable N-N; 18-inch 50 Ω coaxial cable BNC-BNC; N male to BNC female adapter; rear connector shield; Power Cord; spare fuses; CRT filter set consisting of amber and gray light filters plus mesh filter, 492PGM includes gray CRT filter (no filter set)
Weight 492BP: 21.76 kg (47 lbs) 492PGM: 21.3 kg (46 lbs)
Power 90 − 132 VAC, 48 to 440 Hz; 180 – 250 VAC, 48 to 440 Hz. At 115 VAC, 60 Hz, 210 W max
Operating Atmospherics Temperatures: -15 °C to +55 °C; Humidity: Five cycles (120 hours) MIL-STD-810; Altitude: Up to 4.6 km (15,000 ft)
GPIB Characteristics In accordance with IEEE Standard 488-1978 implemented as SH1, AH1, T5, L3, SR1, RL1, PP1, DC1, DT1, and C0

Options

  • Opt. 01: Internal Preselection. (Limits the first band to 1.8 GHz instead 4.2 GHz). Later became standard
  • Opt. 02: Digital Storage. Later became standard
  • Opt. 03: Frequency Stabilization & 100 Hz Resolution. Later became standard
  • Opt. 07: 75Ω dBmV input and calibration in addition to the normal 50Ω dBm input and calibration. (Not combinable with Opt. 21 and 22; no external mixer capability). Include 42-inch 75Ω BNC-BNC coax cable and BNC male to “F” female adapter.
  • Opt. 21: (492BP) High performance 18 to 40 GHz WM490 Series Waveguide Mixer Set
  • Opt. 22: (492BP) Same as Opt. 21 plus WM490U (40-60 GHz) Waveguide Mixer
  • Opt. 23: GRASP software, PC2A interface, and GPIB cable
  • Opt. 27: Epson LT-386SX, GRASP software, PC2A interface, and GPIB cable
  • Opt. 28: Compaq Deskpro 386S, Model 40, GRASP software, PC2A interface, and GPIB cable
  • Opt. 39: Non-lithium (Silver) batteries for battery-backed memory
  • Opt. 41: Digital Microwave Radio Measurement Enhancement package
  • Opt. 42: Replaces MARKER/VIDEO input port on the rear panel with a 110 MHz IF output port that provides a 3 dB signal bandwidth ≥ 4.5 MHz
  • Opt. 45: (all except 492PGM) MATE/CIIL language interface

Links

Connections

Front panel inputs/outputs are:

  • RF INPUT (50 Ω N connector) – Input for RF signals to 21 GHz. If input signal has a DC component, use a blocking capacitor
  • CAL OUT (BNC connector) – Provides 100 MHz, –20 dBm signal and a comb of frequency markers 100 MHz apart
  • 1ST LO OUTPUT (SMA connector) – Output of the 1st local oscillator, must be terminated into 50 Ω when not connected.
  • 2ND LO OUTPUT (SMA connector) – Output of the 2nd local oscillator, must be terminated into 50 Ω when not connected.
  • EXTERNAL MIXER RF INPUT (TNC connector, 50 Ω)
  • Camera Power

Rear panel inputs/outputs are:

  • PROBE POWER – Provides operating voltages (+5 V, -15 V, +15 V; 100 mA max each) for active probes
  • HORIZ/TRIG (input, BNC) – In External Triggering mode, AC coupled input for trigger signals; when TIME/DIV selection is EXT, DC coupled input for horizontal sweep voltages
  • MARKER/VIDEO (B053575+, output, BNC) – interfaces the 492/492P with a TV Sideband Adapter, such as the Tek 1405, so a marker from the adapter is displayed on the internal video. External video applied to this connector will also be displayed if pin 1 of the ACCESSORIES connector is grounded.
    • Opt. 42 replaces MARKER/VIDEO with 110 MHz IF (output, BNC) – 3 dB signal bandwidth ≥ 4.5 MHz
  • EXT PRESELECTOR (B053574 and below) (output, BNC) – variable voltage (approx -0.2 V to +10 V) proportional to center frequency, for preselector bands of Opt. 01 instruments, to drive an external preselector
  • HORIZ (output, BNC) – 0.5 V/div horizontal signal
  • VERT (output, BNC) – Video signal with 0.5 V/Div
  • PEN LIFT (output, BNC) – TTL compatible signal to lift the pen of a chart recorder during sweep retrace. In Opt. 42 instruments this port may also be used for inputting external video if pin 1 of the ACCESSORY connector is grounded.
  • 10 MHz IF (output, BNC) – Output of the 10 MHz IF
  • J104 ACCESSORY (B053575+ only), female DB25 connector – Provides bidirectional access to the instrument bus.
  • IEEE STD 488 PORT GPIB interface – Added to all "P" suffixed instruments

Pictures

492

492A

492BP

492PGM