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Model 4440B
3-1.
3-2.
Section III
Paragraphs 3-1 to 3-4
SECTION
111
OPERATION
INTRODUCTION
The
Model
4440B
Decade
Capacitor
provides
capacitance
from
40pF to 1.24F
in steps of 100pF.
Between steps a variable air capacitor provides con-
tinuous
adjustment
to better than 2pF.
Capacitance
setting can be directly read out from in-line display.
3-3.
CONTROLS
AND CONNECTORS
3-4.
The
front panel
controls
and connectors
are
explained in Figure 3-1.
=
4,
ттр
20 60 so
НЕ
зэнэх
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Ф
Q
HIGH,
LOW
terminals:
Provide
capacitance
value set by decade switches and vernier control.
Low
terminal is at floating ground potential, and
should
be tied to
Ground
terminal
(+)
with
grounding strap in a two-terminal connection.
Ground terminal (45): Connected to the cabinet
internally.
When
grounding
strap
is
discon-
nected from the LOW terminal,
the
instrument
may
be used
as a three- terminal
connection
capacitor.
Decade
switches:
Provide
capacitance
up
to
1. 1999u4F between
HIGH
and LOW terminals in
steps ої 0, 0001 pF (100pF).
The value of capac-
itance
is displayed
in the windows
just above
the control
knobs
ganged
with the switches
in
in-line form.
lst decade switch: provides capacitance
of 0 to 1. ІШЕ in O. 1yF steps.
2nd decade switch: provides capacitance
of 0 to 0, 09uF in 0. OLF steps.
3rd decade switch: provides capacitance
of 0 to 0, 009uF (9000pF) in 0.001 uF (1000pF)
steps.
4th decade switch: provides capacitance
of Oto 0.0009uF (900p F) in 0, 0001 uF (100pF)
steps.
4. Vernier
control:
Provides
40pF to 140pF
of
continuously adjustable capacitance between the
100pF steps ofthe smallest decade.
Resolution
is 2pF
and
dial scale
is linear.
Letters
in
100pF to 140pF range are in red.
Figure 3-1.
Front Panel Controls and Connectors
4440B-1
3-1
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