參數(shù)資料
型號: PCL-818L
廠商: Electronic Theatre Controls, Inc.
英文描述: High-performance DAS card with programmable gain
中文描述: 高性能DAS的可編程增益卡
文件頁數(shù): 16/74頁
文件大?。?/td> 546K
代理商: PCL-818L
12
PCL-818L User's Manual
Timer clock selection (JP2)
JP2 controls the input clock frequency for the 8254 programmable
clock/timer. You have two choices: 10 MHz and 1 MHz. This lets you
generate pacer output frequencies from 2.5 MHz to 0.00023 Hz
(71 minutes/pulse).
The following equation gives the pacer rate:
Pacer rate = Fclk / ( Div1 * Div2 )
Fclk is 1 MHz or 10 MHz as set by jumper JP2. Div1 and Div2 are the
dividers set in counter 1 and counter 2 in the 8254. See Chapter for
more information on the card's 8254 counter/timer.
10 MHz
1 MHz (default)
TRIG0 and GATE0 Selection (JP3)
JP3 has two jumpers. The upper jumper selects the card's A/D trigger
source when you use external triggering. The lower jumper selects the
gate control for counter 0 of the card's 8254 timer/counter.
Upper jumper source for external trigger:
You have two choices: DI0 (pin 1) on connector CN2 or TRIG0 (pin
35) on CN3.
TRIG0
DI0 (default)
Lower jumper Counter 0 gate controller
You have two choices: DI2 (pin 3) on connector CN2 or GATE0 (pin
36) on CN3.
GATE0
DI2 (default)
1M 10M
1M 10M
DIO TRIG0
DIO TRIG0
DI2 GATE0
DI2 GATE0
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