Tektronix 570, Manual

Page: 29 / 134

- 1 3 - 1 1
-9 -7 -5
-3 - 1
.
- 1 -.8
0 Eg
.5 MA/ DIV
.2
VOLTS/DIV E
-
I
gl
Control Settings for Pentode section of
a
6U8
PRAK VOLTS
SERIES LOAD
STEPS/SEC
VOLTS/STEP
START ADJUST
PLATE-GRID
PLATE -SCREEN -GRID
MA/DIV
VOLTS/DIV
+DC
+DC VARIABLE
100
50k
2 40
. 1
o
GRID
SCREEN
.5
.2
50
Set for 38 volts
Fig. 2-14.
S c r ee n Current vs. Grid Voltage curves fo r the pentode
section of a
6U8.
S P E C I AL APPLICA liONS
The Type
570
can be used to display the
characteristics of special circuits and tubes .
Resistors can be added between cathode and
ground to show the effect of degeneration.
Two triodes can be connected in a cascode
circuit to obtain their characteristics in this
connection. Similarly, two triodes can be
c as c aded although this connection may be less
useful.
Curves can be plotted of current versus
voltage for gas diodes. For instanc e , in this
way you can obtain the firing potential and
voltage drop of a voltage reference tube.
Other special applications may occur to you from
time to time. Be sure to check the current
requirements of a special circuit. The Grid­
Step Generator. Plate -Sweep Generator and+ DC
circuit are designed for electron flow from
ground into the circuit only. A certain amount
of current can be drawn from these circuits
in the reverse direction but they quickly drop
. 1 MA/ DIV
'. 1 VOLTS/DIV E­
P
Control Settings for
a
Silicon Diode Type IN 1566
PEAK VOLTS
SERIES LOAD
PLATE-GRID
PLATE -SCREEN-GRID
MA/DIV
VOLTS/DIV
100
200k
PLATE
PLATE
. 1
. 1
Fig.
2-15.
Curve displayed by a type
11'1566 diode.
.2 MA/D IV
20 VOLTS/DIV Ep
Control Settings for
a
Gas Diode Type 565 1
PEAK VOLTS
SERIES LOAD
PLATE-GRID
PLATE-SCREEN -GRID
MA/DIV
VOLTS/DIV
-DC
1 00
20k
PLATE
PLATE
.2
20
Set for -20 volts
F
i g
.
2-16.
Displaying the firing potential and voltage drop of a type
5651
g a
s
diode. Not e the cathode is connected to the -DC connector.
AA
Operating Instructions - Type
570
2-11