Table of Contents
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Model 211B
Section I
Paragraphs 1-1 to 1-5
SECTION
|
GENERAL
INFORMATION
1-1.
DESCRIPTION.
1-2.
The -hp- Model 211B Square Wave Generator
(shown in Figure 1-1) is a compact,
general purpose
instrument providing negative pulses of variable fre-
quency,
symmetry and amplitude.
Complete specifi-
cations of performance are given in Table 1-1. Two
independent outputs are available.
The 502 source
supplies pulses with 5ns rise and fall times and a
peak output of 5 volts across
502.
Simultaneously,
a 6002
source provides pulses of 30 volts across
6002 having a rise and fall time of 70ns.
Matched
output impedance provide twice the voltage across
an open circuit.
Amplitude for both pulses is
seperately controllable.
The frequency range of the
instrument,
1 Hz to 10 MHz,
is covered in 7 decade
ranges with a linearly calibrated dial for continuous
adjustment on all positions.
The 502 output oper -
ates to 10 MHz, the 6002 output to 1 MHz.
The
duty cycle can be varied from 25% to 75%.
1-3.
Trigger output pulses,
for synchronizing exter -
nal circuits or instruments,
have a pulse width of less
than 20ns, reversible polarity and an amplitude of at
ro. F a l 218 SQUARE WAVE
HEWLETT
PACKER
least 2 volt across
502.
The trigger output is coin-
cident with the leading edge of the 502 output. The
211B operates free running or may be synchronized
with external signals of either sinewaves or positive
pulses,
1-4.
MANUAL
IDENTIFICATION.
1-5.
Information in this manual applies directly to
Modell 211B instruments with serial prefix of G- 621
The serial prefix is the first three digits of the eight-
digit serial number
(e. g. 000-00000) used to indentify
each -hp- instrument.
If the serial prefix of a Model
211B is not G-621,
a manual change sheet supplied
with the manual will define the differences between
that Model 211B and the one described in this manual,
or a different manual will provide correct informa-
tion.
Corrections to this manual,
due to errors that
existed when it was printed, are called Errata and
appear only on the change sheet supplied.
To obtain
correct manual information for any instrument,
con-
tact the nearest Hewlett-Packard
Company
Sales/Serv-
ice Office and always specify the model number and
serial number.
Figure 1-1
Model 211B Square Wave Generator
1-1
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