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> Tektronix 475A 250MHZ 2CH oscilloscope
Tektronix 475A 250MHZ 2CH oscilloscope
VERTICAL DEFLECTION (2 IDENTICAL CHANNELS)
Bandwidth* and Rise Time (at all deflection factors from 50 terminated source)
*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.
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 V/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 .
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)
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
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).
1 M 2% paralleled by approx 20 pF.
500 V (p-p ac at 1 kHz or less)
Permits viewing leading edge of displayed waveform
Connectors provide correct voltages for two optional P6201 FET Probes
0.05 s/div to 0.5 s/div (1-2-5 sequence). X10 mag extends max sweep rate to 5 ns/div.
0.05 s/div to 50 ms/div (1-2-5 sequence). X10 mag extends max sweep rate to 5 ns/div.
0.01 s/div to 0.5 s/div (1-2-5 sequence). X10 mag extends max sweep rate to 1 ns/div.
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
A, mixed sweep, A intensified, B delayed. B ends A for increased intensity in the delayed mode.
Displays A sweep for period determined by delay-time position control, then displays B sweep for remainder of horizontal sweep.
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
Over one or more major dial divisions
Less than one major dial division
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.
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.
Adjustable control permits a stable presentation of repetitive complex waveforms.
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
Requirements increase below 60 Hz
Requirements increase below 50 kHz
Requirements increase below 60 Hz and above 50 kHz
0.5 ns or less at 100 MHz and 5 ns/div
0.2 ns or less at 200 MHz and 1 ns/div
0.2 ns or less at 250 MHz and 1 ns/div
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.
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.
Norm, Ch 1, Ch 2, line, external, and external divided by 10
Starts after delay, norm, Ch 1, Ch 2, and external
R and C approx 1 M paralleled by approx 20 pF. 250 V (dc + peak ac) max input.
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.
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.
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.
internal, nonparallax; variable edge lighting; markings for measurement of rise time
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.
Dc coupled, positive-going signal decreases intensity; 5 V p-p signal causes noticeable modulation at normal intensity; dc to 50 MHz.
Nonoperating: -55 C to +75 C. Filtered forced air ventilation is provided.
Operating: to 15,000 ft; max allowable ambient temperature decreased by 1 C/1000 ft from 5000 to 15,000 ft.
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.
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).
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.
Ch 1 vertical signal is dc to at least 50 MHz (-3 dB), and approx 25 mV/div terminated into 50 , and approx 50 mV/div terminated into 1 MW. (475/475A) Ch 2 vertical signal is dc to at least 50 MHz (-3 dB), and approx 10 mV/div terminated into 50 , and approx 20 mV/div terminated into 1 M .
Positive gates from both time bases (approx 5 V)
Quick-change line voltage selector provides six ranges; 110 V, 115 V, 120 V. 220 V, 230 V, and 240 V, each 10%. 48 to 440 Hz, 75 watts (465) or 100 watts (475, 475A) max at 115 V and 60 Hz.
SCOPE WORKS AND HAS A 30 DAY WARRANTY.
