PC-45X(E2)
Page3
Texmate, Inc. Tel. (760) 598-9899
The PC-45X may be used in a wide variety of configurations. The following circuits illustrate some of the possibilities and demonstrate the exceptional versatility of Texmate products.
Components called for in the applications which are not part of the standard meter may be supplied by the user or in some cases purchased from Texmate. The circuit diagrams
explain the basic pinout connections required for each application. Unless otherwise specified, the diagrams will show the component values and solder junctions that would normally
be installed on a standard 2V range meter. For those applications which have alternative ranges and/or input configurations, the required component values and any modifications
are described in the text.
NOTE: Use of these application circuits is entirely at the risk and responsibility of the user and any user modification of the meter may at the discretion of
Texmate, void the warrany. (See rear page for user's responsibility and warranty details.) The following legend applies to all application circuits: 1) optional component positions
are shown in dotted lines; 2) internal solder junctions are shown by for a closed junction or for an open junction; 3) a mechanical switch is shown by .
COMPONENT LAYOUT
TYPICAL APPLICATION CIRCUITS & CONNECTION INSTRUCTIONS
Cv
Cv
SOLDER SIDE
COMPONENT SIDE
OPTO-ELECTRIC COUNT INPUT
A solid-state opto-electric NPN device can be interfaced directly to
the event counter. External power maybe required to power the LED
section of the device if more than 5mA is required. Note: R1 can be
changed to match the sensitivity of the photosensor.
MOST COUNT OUTPUT DEVICES CAN BE DIRECTLY INTERFACED
Photoelectric devices, contact closure, switches, NPN open collector tran-
sistors, and voltage pulses up to 100 V can be used direclty with Model
PC-45X without expensive and complicated interfacing circuitry.
DOUBLE CONTACT CLOSURE COUNT INPUT
A mechanically coupled single pole double throw contact closure can be
used as a count input device when J10 is opened. The contact noise
debouncing circuit consists of a low-pass filter and a R-S flip-flop. After a
count input is created making the connections between Pin F and Pin J, no
further count inputs will be accepted until a contact is made between Pin E
and Pin J. For higher count rates up to 0~600,000 CPM (10KHz) reduce
C3 and C4 to 2500pF or remove entirely.
COUNT INPUT WITH SINGLE CONTACT SWITCH CLOSURE
A mechanically coupled single pole single throw contact closure can
be used as a count input device for count rates up to 6000CPM
(100Hz). The contact noise debouncing circuit consists of a low-
pass filter and a Schmitt Trigger with 15% Hysteresis. If required, a
higher count rate of 0~400 Hz can be achieved by reducing C3 to 2500pF
