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PLUG-IN CARDS

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GENERAL PAGE

Model 10ACT01
Counter/Timer Card

Model 10ACC-4
Four-Channel Totalizer Card

	Model 10ACT01 Counter/Timer Card
	Model 10ACC-4 Four-Channel Totalizer Card

Model 10ACT01 Counter/Timer Card     [Back ]

Featuring a 1.000000-MHz crystal frequency reference, this card may be made to function in any of the four modes of operation described below, by entering an appropriate TYPE (TYP) command.

In all but the "TIMER" mode, the "events" being counted by the 10ACT01 are waveform pulses, AC or unipolar, delivered to the card's rear I/O Connector by

	an external pulse transformer transducer with two-wire isolated windings (turbine flowmeter, tachometer pickup, etc.)
	a transistor or logic-circuit driver
	any similar signal source

(see Specifications for the 10ACT01's pulse-signal input).  The analog-input voltage range may be set, independent of the mode of operation, via the SENSITIVITY (SEN) command.

Capacitive coupling of 0.1 or 10 microfarads is provided for low-frequency inputs, to eliminate false triggering by signal noise.

Click here for counter/timer channel "type codes."

FREQUENCY MEASUREMENT

In this mode, the Model 10ACT01 counts events per unit time (EPUT), and may thus be used for frequency or rpm measurement.  The full-scale range (with corresponding resolution) and the specific time base during which "events" (pulses) are to be counted are selectable via the RANGE (RNG) command from the following values.  Multiple 10ACT01's operating in this mode may be "slaved" for time-base synchronization.

PERIOD MEASUREMENT

In this mode, the Model 10ACT01 calculates the average time period required for the occurrence of 1, 10, 60, 100, or 120 pulse "events" (cycles).  Such measurements are particularly useful when dealing with relatively low flow or speed signals, where a conventional frequency-to-voltage conversion is impractical.  The full-scale reading (along with corresponding resolution and minimum frequency input) is also selectable, again via the RANGE (RNG) command, as shown in the following table.

TOTALIZER (COUNTER)

In this mode, the Model 10ACT01 counts all perceived "events" (pulses) by an increment of 1, 10, or 100 (with a respective full-scale count reading of 32767, 327670, or 3276700), selectable via the RANGE (RNG) command ("Range Nos." 1, 2, or 3, respectively).

As shown in the table below, special commands allow the operator or computer to increment the counter reading at any time, to freeze the existing displayed count, to instantly update the displayed count, to reset the counter to zero, and to clear the counter (to resume normal counting from zero).  You can also use specific logic inputs to the 10ACT01's rear I/O Connector to initiate a "hold," "release," "resetting," or "clearing" of the counter.

TIMER

In this mode, the Model 10ACT01 provides precision timing by counting pulses generated by its own internal clock.  Resolution is selectable via the RANGE (RNG) command from 10 microseconds to 10 minutes, with corresponding full-scale readings from 0.32767 second to 327670 minutes, as follows:

As shown in the table below, special commands allow the operator or computer to freeze the displayed time value, to update the displayed time value, to reset the timer to zero, and to clear the timer (to resume normal timing operation from zero).  You can also use specific logic inputs to the 10ACT01's rear I/O Connector to initiate a "hold," "release," "resetting," or "clearing" of the timer.

A special command lets you disconnect the 10ACT01's external input (including any and all logic commands received at the I/O Connector) in order to establish strictly internal control of the timing process (via mnemonic commands).  You can then re-enable the external input whenever you wish the card to respond as well to external logic-signal commands—as, for example, when you're timing the duration of a switched process state.  The external-input disable/enable function is also available via logic command at the 10ACT01's rear I/O Connector.

Model 10ACT01 Specifications  [Top ]
Input Type	Any AC or unipolar pulse signal, grounded or floating, irrespective of waveform
Input Threshold Level	Accommodates signals from 100 mV to 200 V
Excitation	Nominal ±5 VDC (±20 mA maximum); may also be wired for ±10 VDC excitation to "zero-velocity" sensor
Amplifier
Normal-Mode Range	±200 V operating and without instrument damage
Common-Mode Range	±50 V operating; ±90 V without instrument damage
Common-Mode Rejection Ratio	-120 dB at 60 Hz; -60 dB at 1 kHz
Input Impedance	Differential: 400 kΩ Common-Mode: 100 kΩ
Time-Base Accuracy	0.01% of full scale

Model 10ACC-4 Four-Channel Totalizer Card     [Back ]

This card provides the totalizer (counter) function of the Model 10ACT01 Counter/Timer Card for up to four individual TTL-level inputs (+ 5 VDC, maximum; contact closures are negative true to ground).  It is particularly useful in assembly-line applications that require the accurate counting of large numbers of parts.

Unlike the 10ACT01, the Model 10ACC-4 has input provisions for a user-supplied auxiliary external power supply from 9 to 15 VDC, which would let you keep the count "alive" during system power shut-down.

Also, you may select a debounce time from 0.06 through 30 milliseconds for all four inputs, via DIP-switch settings on the 10ACC-4 board.

Like the 10ACT01, the 10ACC-4 provides for the application and release of "COUNT HOLD" and "COUNT RESET" by special commands (see table, above), or by appropriate negative-true logic inputs at the rear I/O Connector.