Tektronix 535A, Instruction Manual

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Characteristics —Type 535A
Accessories
Standard Accessories supplied with the Type 535A are
listed on the last pullout page of the Mechanical Parts List
Illustrations. For optional accessories available for use with
this instrument, see the current Tektronix, Inc. catalog.
standardization of the main-unit vertical amplifier transient
response of a Tektronix convertible oscilloscope. Risetime
of the Type P is approximately 4 nanoseconds when it is
used to standardize a Type 540-Series Oscilloscope. Pulse
repetition rate is 240 step functions per second, with either
positive or negative polarity. Step function amplitude is
continuously adjustable between 0 and 3 major graticule
divisions.
Type N
Type Q
The Type N Sampling Unit is designed for use with Tek­
tronix plug-in type Oscilloscopes. The sampling system thus
formed permits the display of repetitive signals with frac­
tional nanosecond (10-9 second or nsec) risetime. By taking
successive samples at a slightly later time at each recur­
rence of the pulse under observation, the Type N recon­
structs the pulse on a relatively long time-base. Specifica­
tions of the Type N include a risetime of 0.6 nsec, corresond-
ing to a maximum bandpass of approximately 600 mc; a
sensitivity of 10mv/cm with 2 mv or less noise; and a
dynamic range of ±120 mv minimum linear range before
overloading results.
The Type Q Plug-In Unit permits any Tektronix convert­
ible oscilloscope such as the Type 535A to be operated
with strain gages and other transducers. Excitation voltages
for the strain gages and transducers are provided by the
plug-in unit. The unit provides high gain, low noise, and
extremely low drift. Frequency response of the Type Q
Plug-In Unit is DC to 6 kc; risetime is approximately 60
microsecond. Strain sensitivity is calibrated in 10 steps
from 10 microstrain per major graticule division to 10,000
microstrain per division, and is continuously variable be­
tween steps.
Accidental overload of ±4 volts de is permissible.
Fig. 1-2. Type 535A Oscilloscope Dimensions.
Type P
The Type P Plug-In Unit generates a fast-rise step-function
test signal of known waveform, simulating the output of an
ideally compensated Type K Unit driven with a Tektronix
Type 107 Square-Wave Generator. The Type P permits the
Type R
The Type R Plug-In Unit is a combined power supply and
pulse generator which is used to measure the high-frequency
characteritics
of junction transistors by the pulse-response
method. When the Type R is used in an oscilloscope hav­
ing a delay line; delay time, risetime, storage time, and
falltime may be displayed simultaneously. A push-button
switch
connects a front-panel terminal directly to the input
of the oscilloscope for observing externally derived wave­
forms.
Pulse risetime of the Type R unit is less than 5 nanosec­
onds, so measurements depend on the risetime of the oscil­
loscope used. Pulse amplitudes are in 8 fixed, calibrated
steps from .05 to 10 volts, adjustable between steps. Pulse
recurrence frequency is 120 pulses per second.
Type S
The Type S Plug-In Unit is designed for use with Tektronix
Wide-Band convertible oscilloscopes. The slower risetime
of the Tektronix 530-Series Oscilloscopes will affect the
ability of the S Unit to analyze fast semiconductor diodes.
Using the Type S, voltage across a test diode is displayed
as a function of time.
Certain diode parameters, such as junction resistance,
junction capacitance, and the stored charge at the junction,
can be measured readily and reliably from the display. Per­
formance of a diode in a particular circuit can be pre­
dicted by analyzing the recovery and "turn-on" character­
istics. Since it is essentially a means for plotting voltage
across an element while passing constant current through
it, the unit can be used for other applications as well. For
example: observing the junction characteristics of transistors,
1-3