PRELIMINARY INFORMATION
SAFETY SUMMARY
This instrument is designed to prevent accidental
shock to the operator when used properly.
However, no engineering design can assure the
safety of an instrument used negligently.
THEREFORE, READ THIS MANUAL CAREFUL-
LY AND COMPLETELY PRIOR TO OPERATION
OR ADJUSTMENT.Failure to do so could seri-
ously damage the instrument or injure the opera-
tor. Standard safety precautions must be used
during installation and operation.
Do not operate this instrument where flammable
gases or fumes are present. Parts must be
replaced by qualified repair persons.
IMPORTANT MESSAGES
<WARNING> Denotes a hazardous proce-
dure or condition which, if
ignored, could injure or be fatal
to the operator.
<CAUTION> Denotes a hazardous proce-
dure or condition which, if
Ignored, could damage or
destroy the instrument.
<IMPORTANT> Denotes a procedure or condi-
tion which is essential to the
correct operation of the instru-
ment.
<NOTE> Specifies supplementary, and
perhaps essential information
which should be recognized in
relation to a particular proce-
dure or condition.
CMOS CAUTION
This instrument contains CMOS (complementary
metal-oxide-semiconductor) circuitry which is sus-
ceptible to damage by static electricity. Turn off or
disconnect all power supplies before you make
any connections, DIP switch selections or signal
source applications.
When solder connections must be made (i.e.
replacing parts or zero-OHM jumpers), make sure
the soldering device is properly grounded.
Appropriate static ground conditions MUST be
observed (i.e. as with conductive sheet stock cov-
ers for workbenches, ground wrist-straps, etc.).
SHOCK HAZARD (INDUSTRY STANDARD)
“Shock Hazard,” is defined in Underwriters
Laboratories Radio and Television Receiving
Appliances Standards for Safety. 12th ed., 25
June 1969:
“Shock hazard shall be considered to exist at any
part involving a potential of between 42.4 Volts
peak and 40 Kilovolts peak in the following cases:
A. If the current through a load of not less than 500
OHMs exceeds 300 milliamperes after 0.003 sec-
ond.
B. If the current through a load of not less than 500
OHMs exceeds 5 milliamperes after 0.2 second.
C. If the time required for the current through a
load of not less than 500 OHMs to decrease to 5
milliamperes is between 0.1 and 0.2 second, and
the total quantity of electricity passed through the
load up to that time exceeds 4 millicoulombs.
D. If the time required for the current through a
load of not less than 500 OHMs to decrease to 5
milliamperes is between 0.03 and 0.1 second, and
the total quantity of electricity passed through the
load up to that time exceeds 75T-350T2milli-
coulombs (where T is the time in seconds).
E. If the potential is more than 5 Kilovolts peak and
if the total capacitance of the circuit is more than
300 micromicrofarads.
NOTE: Additional factors might apply when poten-
tials more than 40 Kilovolts are present.”
FOR YOUR INFORMATION ...
(1) DigiTec claims proprietary rights to the materi-
al disclosed herein. The following parts lists, com-
ponent layouts, and schematic drawings are
issued in confidence, for engineering information
only, and may not be reproduced by any means,
or used to manufacture anything shown, without
the direct written consent of DigiTec.
(2) Specifications, Parts Lists, Component
Layouts, and Schematics are subject to change
without notice.
(3) The terms “instrument,” “unit,” and “printer” are
used synonymously throughout this manual.
