SECTION I - DESCRIPTION
A. GENERAL DESCRIPTION
The Autograf, Model 2S, is a two-axis, flat-bed, graphic recorder designed
for general laboratory use. The Model 2s has in addition a built-in time
base (or sweep circuit) operating optionally on the X-axis. The flat horizon-
tal recording surface accommodating 11" x 17" standard graph paper with
recording accomplished on two axes, Y and X, corresponding to the pen and
carriage, respectively. Each axis is controlled by an identical self- balanc-
ing servo-mechanism, electrically independent and isolated from ground. In
operation, one servo-mechanism moves the recording pen in a vertical direc-
tion and the other in a horizontal direction in response to input signals repre-
senting the desired data applied to the respective input terminals. The re-
sulting relative motion of the two servo-mechanisms traces a Cartesian co-
ordinate graph of the relationship on the paper.
The sequence of basic recorder functions is outlined in the following block
diagram, Fig. 2.
REFERENCECELL
I CHOPPER SERVO MQloR
BALANCE
Y - - ATTEN. FILTER
CIRCUIT
SERVO AMP.
i
1 A SERVO AM?
X ATTEN. - FILER - BALANCE CIRCUIT --@
'
CHOPPER SERVO MOTOR
REFERENCE CELL
AUTOGRAF Block Diagram
Fig. 2
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ACEC
HEWLETT-PACKARD
