Tektronix 570, Manual

Page: 17 / 134

SECTION J
CHARACTERISTICS
CHARACTERISTICS
General Description
The Type 570 Characteristic-Curve Tracer
presents a graphic analysis of vacuum-tube
characteristics under a wide range of operating
condition s . Calibrated horizontal and vertical
deflection make it possible to measure the
characteristics that have been reproduced on a
mask over the cathode-ray tube. Front panel
s witching between two test sockets permits rapid
comparisons between two tubes or between two
s ections of the s arne tube.
OPERATING CHARACTERISTICS
Vertical Defl ection Factor
Eleven steps from .02ma/div. to 50ma/div.
Accuracy: 3%
Horizontal Deflection Factor
Nine steps from . 1 v/div. to 50v /div.
Accuracy: 3%
G rid-Step Generator
Number of steps per family:
Number of steps per second:
Voltage change per step:
4 to 1 2.
120 or 240.
Seven from
.1
to 10 volts/step.
Accuracy: 3%.
A single-family provision permits observation
of tube characteristics under unusual con­
ditions without danger of damage to the tube
under test.
Maximum current: 50 rna average.
100 rna peak.
A 1/16 amp fuse protects the current meas­
uring resistors in the .02 rna to 1 rna posi­
tions of the MA/DIV. switch on instruments
above serial number 500 1 .
Plate Sweep Generator
Peak plate-sweep voltage:
Eight steps from 5 to 500 volts. Nominal
voltages depending on line voltage.
Series load resistance:
Eleven steps from 300 ohms to 1 meg­
ohm.
Accuracy: 300 ohms , 30%;
lk
and 2k, 10%;
5 k to 1 meg, 5%.
Maximum current capability
1 amp peak.
. 25 amp average.
A 1 /2 amp fuse protects the plate-sweep
generator. In instruments above serial
number 5001 an additional 1 /16 amp fuse is
inserted to protect the current measuring
circuits in the .02 rna to 1 rna positions of
the MA/DIV. switch when measuring plate
current.
Operating Voltages
Heater Voltages:
Seventeen steps from 1 . 25 volts to 1 17 volts ,
each step adjustable over a range of about
±20%.
Maximum Heater Power: 30 watts.
Positive DC Voltage:
Five calibrated steps from 20 to 300 volts ,
3% accuracy.
Continuously variabl e , uncalibrated, from 1 0
t o 300 volts.
Maximum Current From
+
DC
Circuit
150 rna peak.
50 rna average.
Negative DC Voltage:
Continuously variable from 0 to -100 volts.
Voltmeter
Measures positive and negative operating volt­
ages in seven ranges from 7 to 700 volts , full
scale.
Characteristics - Type 570 1-1