PCB Piezotronics 8120-110A, Инструкция по установке и эксплуатации

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MODEL 8120 DIGITAL INDICATOR OPTION OPERATION MANUAL
2
1.0 DESCRIPTION
The 8120 Instrument Series is a family of premium
signal conditioning instruments that includes
models to accommodate virtually all types of
transducers and signal sources commonly
encountered in electro-mechanical testing and
control operations. The 8120 Instruments are
available in three forms: Signal Conditioner only;
Signal Conditioner with Digital Indicator; and
Signal Conditioner with Digital Indicator and Hi-Lo
Limits. The Model numbering system used with the
8120 Series identifies the form and the type of
signal source. This numbering system is further
explained in Table 1. From Table 1, it can be seen
that all models having a Digital Indicator are
identified by a -_10A or -_30A suffix, with the first
digit identifying the type of signal source.
The 8120 Series instruction manual system is
designed to provide the user with the following
documentation: (1) a separate instruction manual for
each type of Signal Conditioner purchased; (2) an
instruction manual covering only the Digital
Indicator section of a 8120 Series instrument, but
applicable to any -110A or –130A instrument; and
(3) an instruction manual covering only the Hi-Lo
Limit section 2 of a 8120 Series instrument, but
applicable to any –130A instrument. It is the
purpose of this manual to cover the Digital Indicator
section of all -_10A or -_30A instruments.
The Digital Indicator section of any -_10A or -_30A
instrument consists of a printed circuit board on
which are mounted the required circuit components
for digitizing the analog output of the Signal
Conditioner and the light-emitting-diode (LED)
display. This board is mounted above the circuit
board that contains the components for the Signal
Conditioner. The digits that comprise the display
are mounted on a small board, which is affixed to
the digitizer board with a right-angle printed-circuit
board header. The -_30A instruments contain an
additional printed-circuit board for the Hi-Lo Limit
circuitry.
The LED display is comprised of six orange digits
with polarity sign. The 0.4-inch height of the digits,
combined with the inherent brilliance of an LED
type of display, make the display easily discernible
in normal room lighting. The display is viewed
through the red plastic front panel of the instrument
to provide filtering of external light and enhance the
display brilliance. The front panel is opaque except
for that portion through which the display is
viewed. A typical 8120 Instrument with Digital
Indicator is shown in Figure 1.
Table 1 – 8120 Model Numbering System
8120- _ _ 0A
First digit after the dash identifies type of
signal source:
1
= Strain Gages (DC excited)
4 = Strain Gages (AC excited)
7 = Pulse Pick-ups (Frequency)
Second digit after the dash identifies form:
0
= signal conditioner only
1 = signal conditioner with digital indicator
3 = signal conditioner with digital indicator
and Hi-Lo Limits
Figure 1 - Model 8120-110A
The Digital Indicator scaling is selected with rear-
panel pushbutton switches. Full-scale values of
±5000 counted by 1 ' s , ± 10000 counted by 2's, or
±20000 counted by 5's can be selected. The most