Tektronix 465, 475, 475A Series
Oscilloscopes Specifications

VERTICAL DEFLECTION (2 IDENTICAL CHANNELS)

Bandwidth* and Rise Time (at all deflection factors from 50 Ω  terminated source)

-15°C to +40°C

+40°C to +55°C

465

Dc to 100 MHz, 3.5 ns

85 MHz, 4.1 ns

475

Dc to 200 MHz, 1.8 ns

175 MHz, 2.0 ns

475A

Dc to 250 MHz, 1.4 ns

250 MHz, 1.4 ns

*Measured at -3 dB, Bandwidth may be limited to approx 20 MHz by bandwidth limit switch.

Lower -3 dB point, ac coupling 1X probe: 10 Hz or less. 10X probe: 1 Hz or less.

Deflection Factor at BW

465: 5 mV/div to 5 V/div
475: 2 mV/div to 5 V/div
475A: 5 mV/div to 10 V/div

1-2-5 sequence, accurate ± 3%. Uncalibrated, continuously variable between steps and to at least 12.5 V/div (465/475) to at least 25 V/div (475A).  In cascade mode sensitivity is approx 1 mV/div (465); approx 400 µV/div (475); and approx 2.5 mV/div (475A).  Cascaded bandwidth is at least 50 MHz (465/475/475A) when signal out is terminated in 50 Ω.

Display Modes

Ch 1; Ch 2 (normal and inverted), alternate, chopped (465-approx 250 kHz rate, 475/475A-approx 1 MHz rate), added; X-Y (Ch 1-X, Ch 2-Y)

CMRR

Common-mode rejection ratio at least 20 dB at 20 MHz (50 MHz for 475/475A) for common-mode signals of 6 div or less

Automatic Scale Factor

Probe tip deflection factors for 1X or 10X coded probes are automatically indicated by two readout lights behind the knob skirts.  All lights are off when the channel is not displayed.   Ground reference display selectable at probe (when dc coupled).

Input R and C

1 MΩ  ± 2% paralleled by approx 20 pF.

Max Input Voltage

Dc Coupled

250 V (dc + peak ac)
500 V (p-p ac at 1 kHz or less)

Ac Coupled

500 V (dc + peak ac)
500 V (p-p ac at 1 kHz or less)

Delay Line

Permits viewing leading edge of displayed waveform

Probe Power (475/475A only)

Connectors provide correct voltages for two optional P6201 FET Probes

HORIZONTAL DEFLECTION

465

Time Base A

0.05 µs/div to 0.5 s/div (1-2-5 sequence). X10 mag extends max sweep rate to 5 ns/div.

Time Base B

0.05 µs/div to 50 ms/div (1-2-5 sequence).  X10 mag extends max sweep rate to 5 ns/div.

475/475A

Time Base A and B

0.01 µs/div to 0.5 s/div (1-2-5 sequence).  X10 mag extends max sweep rate to 1 ns/div.

Variable Time Control

Time Base A (465/475/475A) provides continuously variable uncalibrated sweep rates between steps and to at least 1.25 s/div.  Warning light indicates uncalibrated setting.

Time Base A and B Accuracy, full 10 cm

Unmagnified

+20°C to +30°C

-15°C to +55°C

465

475/475A

465

475/475A

± 2%

± 1%

± 3%

± 2%

Magnified

± 3%

± 2%

± 4%

± 3%

Horizontal Display Modes

A, mixed sweep, A intensified, B delayed.  B ends A for increased intensity in the delayed mode.

Calibrated Mixed Sweep

Displays A sweep for period determined by delay-time position control, then displays B sweep for remainder of horizontal sweep.

CALIBRATED SWEEP DELAY

Delay Time Range

465: 0.2 to X10 delay time/div settings of 200/ns to 0.5 s (minimum delay time is 200 ns).
475/475A: 0 to X10 delay time/div settings of 50 ns to 0.5 s (minimum delay time is 50 ns).

Differential Time Measurement Accuracy

Delay Time Setting

+15°C to 35°C

Over one or more major dial divisions

± 1%

Less than one major dial division

± 0.01 major dial division

Jitter

1 part or less in 50,000 (0.002%) of 10X the A sweep time/div setting. 1 part in 20,000 when operating from 50 Hz line.

TRIGGERING A AND B

A Trigger Modes

Normal (sweep runs when triggered).  Automatic (sweep free-runs in the absence of a triggering signal and for signals below 30 Hz).  Single sweep (sweep runs one time on the first triggering event after the reset selector is pressed).  Lights indicate when sweep is triggered and when single sweep is ready.

A Trigger Hold off

Adjustable control permits a stable presentation of repetitive complex waveforms.

B Trigger Modes

B runs after delay time (starts automatically at the end of delay time) and B triggerable after delay time (runs when triggered).  The B (delayed) sweep runs once, in each of these modes, following the A sweep delay time.

Time Base A and B Sensitivity and Coupling

Coupling

465

475

475A

To 25 MHz

At 100 MHz

To 40 MHz

At 200 MHz

To 40 MHz

At 250 MHz

DC

0.3 div deflection

1.5 div deflection

0.3 div deflection

1.5 div deflection

0.3 div deflection

2.0 div deflection

External

50 mV

150 mV

50 mV

250 mV

50 mV

250 mV

External +10

500 mV

1.5 V

500 mV

2.5 V

500 mV

2.5 V

Ac

Requirements increase below 60 Hz

Ac Lf Reject

Requirements increase below 50 kHz

Ac Hf Reject

Requirements increase below 60 Hz and above 50 kHz

465 Jitter

0.5 ns or less at 100 MHz and 5 ns/div

475 Jitter

0.2 ns or less at 200 MHz and 1 ns/div

475A Jitter

0.2 ns or less at 250 MHz and 1 ns/div

A Trigger View

A spring-loaded pushbutton overrides other vertical controls and displays the external signal used for A sweep triggering.  This provides quick verification of the signal and time comparison between a vertical signal and their trigger signal.

Level and Slope

Internal, permits selection of triggering at any point on the positive or negative slope of the displayed waveform.  Level adjustment through at least ± 2 V in external, through at least ± 20 V in external divided by 10.

A Sources

Norm, Ch 1, Ch 2, line, external, and external divided by 10

B Sources

Starts after delay, norm, Ch 1, Ch 2, and external

External Inputs

R and C approx 1 MΩ  paralleled by approx 20 pF. 250 V (dc + peak ac) max input.

X-Y OPERATION

465

Full-sensitivity X-Y (Ch1 Horiz, Ch2 Vert)

5 mV/div to 5 V/div, accurate ± 4%.  Bandwidth is dc to at least 4 MHz.  Phase difference between amplifiers is 3° or less from dc to 50 kHz.

475, 475A

Full-sensitivity X-Y (Ch1 Horiz, Ch2 Vert)

2 mV/div to 5 V/div (475), 5 mV to 10 V/div (475A) accurate ± 3%.  Bandwidth is dc to at least 3 MHz.   Phase difference between amplifiers is 1° or less from dc to 1 MHz.

DISPLAY

CRT

8 X 10 cm display. Horizontal and vertical centerlines further marked in 0.2 cm increments.  P31 phosphor standard; P11 option.  18 kV accelerating potential.

Graticule

internal, nonparallax; variable edge lighting; markings for measurement of rise time

Beam Finder

Compresses trace to within graticule area for ease in determining the location of an offscreen signal.  A pre-set intensity level provides a constant brightness.

Z-Axis Input

Dc coupled, positive-going signal decreases intensity; 5 V p-p signal causes noticeable modulation at normal intensity; dc to 50 MHz.

ENVIRONMENTAL CAPABILITIES

Ambient Temperature

Operating: -15°C to +55°C.
Nonoperating: -55°C to +75°C.  Filtered forced air ventilation is provided.

Altitude

Operating: to 15,000 ft; max allowable ambient temperature decreased by 1°C/1000 ft from 5000 to 15,000 ft.   
Nonoperating: to 50,000 ft.

Vibration

Operating: 15 minutes along each of the three axes, .06 cm (0.025 in) p-p displacement (4 g's at 55 Hz) 10 to 55 to 10 Hz in 1 minute cycles.

Humidity

Operating and nonoperating: 5 cycles (120 hours) to 95% relative humidity referenced to MIL-E-16400F (par 4.5.9 through 4.5.9.5.1, class 4).

Shock

Operating and nonoperating: 30 g's 1/2 sine, 11 ms duration, 2 shocks per axis in each direction for a total of 12 shocks.

OTHER CHARACTERISTICS

Amplitude Calibrator

Output Voltage

0.3 V

1%
0°C to +40°C

Output Current

30 mA