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Model 211B
Section III
Paragraphs 3-1 to 3-13
SECTION
Ill
OPERATION
3-1.
INTRODUCTION.
3-2.
This section contains the operating instructions
for the Model 211B Square Wave Generator.
This in-
strument has been designed
for general purpose
lab-
oratory requirements withthe ease-of-use as a prime
consideration.
Therefore the operating procedure is
quite
simple.
Figure
3-2
identifies
and briefly
describes
the pupose of each panel
control
and
connector on the instrument.
3-3.
DUTY
CYCLE.
3-4.
Duty cycle is defined as the ratio of duration of
pulse (i.e. pulse width) to the total duration of one
complete cycle. Figure 3-1 shows the relationship
which determines the duty cycle.
The time for one
cycle is defined as the period, and the period is re-
lated to repetition rate by:
ae
1
Period = Re5- Rate
Thus the product of pulse width and frequency mul-
tiplied by 100 determines the duty cycle percentage.
3-5.
The SYMMETRY
control is responsible for the
duty cycle setting; the variability being 25 - 75 % of
the period.
The duty cycle remains unchanged when
external synchronizing signals are applied to the
Model
211B.
PULSE
[~ WIDTH |
AMPLITUDE
|
PERIOD =
!
FREQUENCY
4
. -PULSE_WIDTH
%*DUTY CYCLE
Sena
ot
PULSE
WIDTH x FREQUENCY x 100
Figure 3-1 Definition of Output Pulse Characteristics
3-6.
OPERATING
PROCEDURES.
3-7.
The Model 211B canbe operated in two different
modes,
free-running or synchronized with external
signals.
The procedures are detailed in
Paragraphs
3-8 through 3-13.
3-8.
FREE-RUNNING MODE
3-9.
The Model 211B will generate internally any
repetition rate from 1 Hz to 10 MHz (1 MHz at 600 2
output). The repetition rate is established by setting
the MULTIPLIER
selector to any of the seven inter-
nal ranges and then adjusting the FREQUENCY
(Hz)
control
to the specific rate desired.
To operate proceed as follows :
(a) Push instrument LINE switch on.
(b) Set MULTIPLIER to desired range and adjust
FREQUENCY
(Hz) to exact position for frequency
desired.
(c) Adjust SYMMETRY
for desired duty cycle.
(d)
502 OUTPUT.
Select AMPLITUDE
range and
VERNIER setting desired. Note that the cw
position of the VERNIER
yields at least that
indicated voltage on the AMPLITUDE
selector
switch.
(e) 6002 OUTPUT.
Adjust AMPLITUDE
setting as
desired.
Note that the specified amplitude is
across a 6002 load.
Twice the voltage will be
obtained across an open circuit.
3-10
SYNC SIGNALS
3-11.
The Model 211B may be synchronized by ex-
ternal signals of either 1 volt positive pulses or 2 V
peak to peak sinewaves applied to the SYNC INPUT
connector. External signals with frequencies of 105%
to 140% of the internal setting of the 211B can be
synchronized.
If the 211B is not in synchronism with
an external signal compare dial and range settings
with the frequency of the external signal.
3-12.
TRIGGER OUTPUT.
3-13.
Trigger pulses are available at the front panel
of the Model
211B. A positive or negative
pulse,
selected by TRIGGER
POLARITY
switch
and
coin-
cident with the leading edge of the 502 output pulse,
is available at the trigger output connector.
3-1
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