Spectrum Analyzers

2711 • 2712

Features & Benefits

2711

Economical, Can Be Configured to Meet Most Budgets
High Portability
Internal or External Tracking-Generator Option
Internal Frequency Counter (Opt. 02)
GPIB or RS-232 Interface Option
Excellent Frequency Accuracy and Sensitivity
3-Control Operation for Most Measurements
UL Listed 1244, CSA Bulletin 556B

2712

High Value, Low Cost
5 × 10^-7 Frequency Accuracy
Sensitivity to -139 dBm (-92 dBmV) with Built-In Preamp
Internal Frequency Counter
4-Trace Digital Plus True-Analog Display
124 K of RAM
Easy to Use
Dedicated Numeric Keypad Plus Logically-Grouped Menu Keys
Powerful Built-In Measurement Routines
EMC Measurements with Optional Quasi-Peak Detector
Swept Measurements to 1.8 GHz with Optional Internal or External Tracking Generator
UL Listed 1244, Certified CSA C22.2 No. 231-M89

Applications

Broadcast Transmitter Performance
Communications System Operations
EMC Prequalification Testing

2712 Spectrum Analyzer

The Tektronix 2712 Spectrum Analyzer provides excellent RF performance, a built-in frequency counter, full programmability, digital and true-analog displays, high portability, enough nonvolatile memory for 108 saved displays, and much more.

A straightforward human interface, with conveniently grouped, dedicated front-panel keys and simple, menu-driven functions makes the 2712 easy to learn and use. You can set frequency, span, and reference level directly from the front panel. A real-time clock provides an on-screen date and time display, plus date/time stamp capability for waveform printouts.

Frequency-corrected tuning and phase-lock stabilization enhance the ability to resolve close-in signals and reliably demodulate narrowband signals. Sensitivity up to -127 dBm (-80 dBmV) at 300-Hz resolution bandwidth (RBW) lets you see weak signals. The built-in preamp can improve sensitivity another 12 dB, up to -139 dBm (-92 dBmV). Up to 80-dB on-screen dynamic range ensures visibility of weak signals in the presence of strong ones.

A 300 Hz RBW filter with a shape factor <7:1 means you'll see many close-in sidebands and spurious or unexpected signals you might otherwise miss. At the other end of the spectrum the 5-MHz RBW filter is useful when demodulating wideband signals such as actively modulated video carriers.

The built-in signal counter, with 0.5 ppm ±10 Hz accuracy, offers added power for rapidly identifying signals. The capability to choose between digital and true-analog displays lets you examine signals for characteristics that are not visible on digital-only displays.

Sweep speeds of 1 µsec/div, TV Line and TV Field triggering, an internal audio amplifier, AM/FM detectors, and the optional Video Monitor Mode all make video communications measurements easier.

Bandwidth, Carrier-to-Noise, Noise Power, Signal Search, and FM Deviation modes provide additional measurement power and convenience. Occupied Bandwidth Mode, with percent settable from 1 to 99%, aids in broadcast and radio measurements.

The optional internal or external tracking generator provides high dynamic range swept measurements to 1.8 GHz.

EMC Measurement

To help simplify your EMC measurements, the 2712 offers an optional quasi-peak detector, EMI resolution bandwidth filters, and fully corrected E-field intensity measurements to assist in precertification and troubleshooting. EMC ancillary devices are available to provide a complete measurement solution.

2711

2711 Spectrum Analyzer

The 2711 offers a wide range of features at an extremely affordable price. This value leader is well-suited for checking broadcast transmitter performance and communications system operations, looking for unwanted RF emissions, testing two-way communications equipment, maintaining industrial security, and teaching frequency domain concepts in the classroom, plus a wide variety of other applications.

The standard 2711 shares many of 2712's valuable features, such as compact size and light weight (9.5 kg, about 21 lbs.). Both instruments can also be quickly converted to rack operation with optional rackmount adapters.

Frequency accuracy is 1 × 10^-5 and sensitivity is up to -117 dBm (-70 dBmV) at 3 kHz RBW. The built-in preamp can add another 12 dB, up to -129 dBm (-82 dBmV). Up to 80-dB on-screen dynamic range helps see weak signals, even when strong ones are present.

True-analog display capability, along with fast sweep speeds and TV Line and TV Field triggering provide convenient demodulation of video carriers for making depth-of-modulation checks or looking at special baseband data, VITS, and many other signals.

An internal audio amplifier and AM/FM detectors let you hear demodulated signals, using either the built-in speaker or headphone jack, for fast signal identification and troubleshooting in communications applications.

With the Video Monitor (Opt. 10) installed, you can view broadcast (AM) TV signals or down-converted satellite (FM) signals.

The 2711 can also be used with a set of near-field probes as a handy EMC diagnostic tool.

Selection Guide

Capability	2712	2711
Frequency Range	9 kHz to 1.8 GHz	9 kHz to 1.8 GHz
±0.5 ppm Freq. Accuracy	Std.	NA
Signal Counter	Std.	Opt. 02
GPIB Interface	Std.	Opt. 03
Internal Tracking Gen.	Opt. 04	Opt. 04
External Tracking Gen.	Opt. 05	Opt. 05
RS-232C Interface (replaces GPIB)	Opt. 08 (no charge)	Opt. 08 (no charge)
Video Monitor Mode	Opt. 10	Opt. 10
EMC Precertification	Opt. 12	NA
Measurements
TV Sideband	Opt. 15	Opt. 15
Adapter Interface
Nonvolatile Memory	124 K	28 K (124 K with Opt. 03 or 08)
High Portability	Yes	Yes
Both Digital and True-Analog Displays	Yes	Yes
Dedicated Numeric Keypad	Yes	Yes
Real-Time Clock	Std.	With Opt. 03 or 08

Characteristics

The following characteristics apply to both the 2712 and 2711 after a 15-minute warm-up period, unless otherwise noted.

Frequency Related

Frequency Range - 9 kHz to 1800 MHz

Center Frequency Accuracy -

2712: 5×10^-7 of CF ±700 Hz

2711: 1×10^-5 of CF ±5 kHz

Frequency Counter Accuracy (Std. 2712, Opt. 02 2711) -

2712: 5×10^-7 of CF ±10 Hz, ±1 LSB

2711: 1×10^-5 of CF ±10 Hz, ±1 LSB

Dot Marker Frequency Accuracy*¹ - CF Accuracy ±3% of span

Long-term Drift*¹ -

2712: 2 ppm/yr

2711: 10 ppm/yr

Short-term Drift -

2712: ≤400 Hz maximum drift between correction cycles

2711: ≤20 kHz maximum drift between correction cycles

Residual FM -

2712: ≤100 Hz pk-pk/20 msec at ≤20 kHz span/div; ≤2 kHz pk-pk/20 msec at >20 kHz span/div

2711: ≤2 kHz pk-pk/20 msec

Resolution Bandwidth (-6 dB) -

2712: 5 MHz, 300 kHz, 30 kHz, 3 kHz, 300 Hz

2711: 5 MHz, 300 kHz, 30 kHz, 3 kHz

2712 with Opt. 14: Add 1 MHz, 100 kHz, 10 kHz, and 1 kHz

2712 with Opt. 12: Add 1 MHz, 120 kHz, 9 kHz, 1 kHz - 200 Hz replaces 300 Hz filter

Resolution Bandwidth Shape Factor (60 dB/6 dB) - ≤7:1 for RBW ≤1 MHz

Noise Sidebands - ≤70 dBc at 30 × RBW

Video Filter -

Approx. 1/100 (Auto) of RBW

Manual Selection: 3 Hz to 300 kHz in 1-3 sequence

Freq. Span/Div. Range -

2712: 180 MHz to 1 kHz

2711: 180 MHz to 10 kHz selected in 1-2-5 sequence or within two significant digits through a menu

Span Accuracy - ±3% over the center eight divisions

Amplitude Related

Flatness - ±1.5 dB measured with 10 dB internal RF attenuation (preamp off).

Vertical Display Modes - 10, 5, 1 dB/div, Linear.

Measurement Range -

2712: -139 (preamp on) to +20 dBm (-92 to +67 dBmV).

2711: -129 (preamp on) to +20 dBm (-82 to +67 dBmV).

Display Dynamic Range - 80 dB max (limited to 40 dB in optional 2712 Quasi-Peak Detector mode).

Reference Level Range -

LOG Mode: -70 to +20 dBm (-23 to +67 dBmV), or to -90 dBm with preamp on.

LINEAR Mode: 8.8 µV to 280 mV.

Reference Level Steps -

LOG Mode: 1 dB or 10 dB.

LINEAR Mode: 1-2-5 sequence.

Mixer Input Level - Automatically controlled by instrument for on-screen signals. Level selectable between -20 to -50 dBm (+27 to -3 dBmV).

Display Amplitude Accuracy -

10 dB/div: ±1.0 dB/10 dB to max. cum. error of ±2 dB over 70 dB range; ±2.0 dB/10 dB over 70-80 dB range.

5 dB/div: ±1.0 dB/10 dB to max. cum. error of ±2 dB over 40 dB range.

1 dB/div: 1 dB max. error over 8 dB range.

Linear Mode: ±5% of full scale.

RF Attenuation Range - 0 to 50 dB, 2 dB steps.

Sensitivity -

2712: -127 dBm (-80 dBmV) at 300 Hz RBW, -139 dBm (-92 dBmV) at 300 Hz RBW with preamp on (to 600 MHz).

2711: -117 dBm (-70 dBmV) at 3 kHz RBW, -129 dBm (-82 dBmV) at 3 kHz RBW with preamp on (to 600 MHz).

Spurious Response (Preamp Off)

Residual Spurious Response - ≤-100 dBm referenced to input of 1st mixer

3rd Order IM Distortion - ≤-70 dBc, from any two on-screen signals within any frequency span measured with 1st mixer input level of ≤-30 dBm (+17 dBmV)

2nd Harmonic Distortion - ≤-66 dBc measured with 1st mixer input level of ≤-40 dBm (+7 dBmV)

Input Related

LO Emission - ≤-70 dBm with 0 dB RF attenuation

RF Input - Type-N connector, 50 ohm

VSWR with 10 dB or More RF Attenuation - 1.5:1 max

Maximum Safe Input - +20 dBm (+67 dBmV) (0.1 W) continuous peak with 0 dB RF attenuation; 100 V DC (initially applied with full attenuation)

1 dB Compression Point - ≥-15 dBm (+32 dBmV) with 0 dB RF attenuation

Sweep Related

Sweep Times - 1 µsec to 2 sec/div in 1-2-5 seq. (7-decade range); AUTO SWEEP mode; MANUAL SWEEP select

Sweep Time Accuracy - ±10% over the center eight divisions

Trigger - Free run, internal, external, line, TV field, TV line, single sweep, manual scan

Trigger Amplitude -

Internal: One division or more of signal

External: Min. 1.0 V peak, (15 Hz to 1 MHz)

Input/Output Characteristics

External Trigger*¹ -

BNC connector, 10 kilohm impedance, DC coupled 0.1 µs min.

Pulse width: 35 V max.

External Video Input*¹ -

DC coupled. 0-50 kHz, 0-1.4 V (175 mV/div typical) signal input for vertical deflection of CRT beam.

Sweep Gate Out - TTL level, HI while CRT beam sweeps.

Sweep Output - +1.3 to -1.3 V, negative-going ramp, proportional to the horizontal sweep. Source impedance ≤50 ohm.

Video Output - 0 to +1.6 V of video signal, proportional to vertical display amplitude. 0 V is top of screen. 1 kilohm impedance.

Environmental Specifications

Temperature -

Operating: 0 to 50 °C (MIL-T-28800D).

Nonoperating: -55 to +75 °C.

Humidity -

Nonoperating: Five cycles (120 hours) per MIL-T-28800D, Class 5.

Shock -

Operating and nonoperating: Three guillotine-type shocks of 30 g, one-half sine, 11 ms duration each direction along each major axis; total of 18 shocks.

Electromagnetic Compatibility -

EC92 EMC Directive 89/336/EEC.

Emissions: EN50081-I.

Radiated Emissions, 30 MHz to 1 GHz, EN55022 Class B (CISPR 22 B).

Conducted Emissions, 150 kHz to 30 MHz, EN55022 Class B (CISPR 22 B).

Conducted Emissions, power line harmonics. 0 to 2 kHz, IEC 555-213.

Immunity: EN50082-1.

Electrostatic Discharge, 8 kV, IEC 801-2.

Radiated Immunity, 27 MHz to 500 MHz, IEC 801-3. No response above -90 dBm in a 3 V/meter field. Fast transients, capacitive clamp, 1 kV power leads, 500 V control leads, IEC 801-4.

Power Line Surge, 1 kV differential mode, 2 kV Common mode, IEC 801-5.

Vibration - Meets MIL-T-28800E, Paragraph 4.5.5.3.1 (modified).

General Characteristics

Power Requirements - 105 W max. (1.4 A) at 115 V, 60 Hz. Operates 48 Hz to 440 Hz, 90 to 132 V AC, or 48 Hz to 63 Hz to 250 V AC. Battery power (Opt. 07) available.

Physical Characteristics

Dimensions	mm	in.
Height	137*³	5.4*³
Width	361*³	14.2*³
Depth	445*³	17.5*³
Weight	kg	lbs.
Net	9.5*⁴	<21*⁴

*³ With feet, handle, and front-panel cover.

*⁴ Nominal for basic configuration.

Other Capabilities

Markers - Single marker/delta marker; next right, next left peaks; next lower, next higher peaks; (highest) peak find; marker to center frequency and reference level.

Nonvolatile Memory -

Lithium battery backup.

2712: 124 KB available; up to 108 displays saved; 36 front-panel setups, large user-definable key routines, and antenna tables (exact number and size depends on NV RAM utilization).

2711: 28 KB available; up to 18*² displays saved and 9*² front-panel setups, user-definable key routines, and antenna tables.

Digital Storage Display - Selectable acquisition modes of positive peak only, positive/negative peak. SAVE A, B, C, and active D trace; up to four traces on screen; MAX HOLD A, B; MIN HOLD A, B, C; B, C MINUS A; WATERFALL display mode; digital storage off provides analog sweep.

Ensemble Averaging - Provides weighted continuous or discrete averaging of display resulting in reduction of random noise.

Internal Preamp - Preamp can be switched in/out of circuit (flatness degrades above 600 MHz, provides approximately 12 dB sensitivity improvement).

Alternative Reference Level Units - dBm, dBmV, dBV, dBµV, dBµW, dBµV/m.

User-Definable Power-On Status - Instrument powers up to user-definable state or factory default condition.

Center Measure - Signal is centered with frequency and peak amplitude automatically read out (not a marker mode). The signal is counted in the 2712 or 2711 with Option 02.

Signal Track - Drifting signal is kept at display center with correct frequency and peak amplitude displayed.

Graticule Illumination -

For CRT photography in analog display mode.

Supports Epson FX and LQ Series Printers through a built-in GPIB interface (Std. 2712, 2711 Opt. 03), RS-232C interface (Opt. 08, 2712 and 2711).

*¹ Typical but unwarranted performance parameters.

*² Up to 108 saved displays, 36 front-panel setups available with Opt. 03 or 08.