收藏本站
TYPICAL APPLICATIONS
COUNT & CONTROL FROM REMOTE INPUTS
Inputs to SUB-CUB are CMOS inputs and must be adequately buffered if
remote “off-board” signal sources are used. This illustration shows a SUB-
CUB being used in an elementary counting application to depict some of the
buffering methods that can be used.
The Count Input is buffered by the NPN Transistor input circuit. The base
resistance is split into two 10 K resistors, with a filter cap to eliminate spurious
counts due to electrical interference pickup. The filter network will allow count
rates to 10 KHz with Symetrical +5 V input count pulses. The 4.7 K across the
input would not be required if the circuit supplying the count pulses has a low
off-state output impedance.
The Remote Button-actuated Reset input is buffered by a simple RC circuit
consisting of two 47 K resistors and a 0.01 μf capacitor.
COUNT
INPUTS
+5VDC SUPPLY
10K 10K
.005 μf
COMMON
47K
.01 μf
V DD
T
R
C
L
V SS
REMOTE
RESET
+5V
Q
A
FREQUENCY, SPEED, FLOW, SPEED-RATIO,
PERIOD & CYCLE TIME INDICATIONS
This circuit uses a dual monostable I.C. to generate the proper latch and reset
coordination required for frequency or time-period readouts.
When frequency readout is desired, the pulse train whose frequency is to be
displayed, is applied to the CLK-A input, (the inverter, in the CLK-A input,
causes the SUB-CUB to increment on the positive going edge of CLK-A pulses
and can be onitted if negative edge incrementing is satisfactory). The CLK-B
input is supplied with standard time-base pulses whose period determines the
measuring time. For frequency measurement, this time is 1 second so CLK-B
input would be supplied with 1 pulse/sec. from a crystal clock or line-reference
divider. At the positive going edge of each CLK-B pulse, the first monostable
opens the SUB-CUB latch momentarily to update the display to the count
existing at that instant of time. Immediately after the latch closes, freezing the
updated count on the display, the internal counter in the SUB-CUB display is
reset to zero in preparation for a new counting cycle. Thus, at the end of each
measuring time interval the SUB-CUB display is updated to readout the number
of pulses received during the period, while it is accumulating new counts for the
next update.
Frequency ratio can be displayed by replacing the standard time-base (CLK-
B) input with a pulse train related to the second variable (or denominator) of
the ratio. Normally this pulse train is divided by 10, 100, or 1000 before being
applied to the CLK-B input to provide a higher resolution reading.
For period or cycle-time indication, CLK-A and B inputs are simply
interchanged. CLK-A input is now supplied with standard Clock Pulses, say 1
Hz to readout in seconds, while the pulse train whose period is being measured
is applied to the CLK-B input.
CLK-B
CLK-A
CLK-A
CLK-B
L-LATCH
R-RESET
14
12
11
.001 μf
1/2-4528
A
B
15 8
Q
9
2
4
5
.001 μf
3 16 13
1/2-4528
B
1
7
V DD
T
R
C
L
V SS
TIME BASE
OR PERIOD
+5V
PULSE WIDTH OR DWELL-TIME READOUT
3
16 13
This circuit also uses two monostables, however for pulse-width readout they
function at two different times.
A train of standard clock pulses, whose period determines the readout
increments, is applied to the CLK-A input. For example if readout in seconds is
desired, CLK-A would receive 1 pulse/second, or 1 Hz The pulse whose width
is to be measured is applied to CLK-B input. At the positive going edge of the
CLK-B pulse, the first monostable momentarily resets the SUB-CUB internal
counter to zero, and it then begins accumulating counts from the CLK-A time
reference pulses. At the conclusion of the CLK-B pulse, the negative going
edge momentarily opens the SUB-CUB display latch, and the number of time-
reference pulses that have been counted, since reset, is latched on the display to
provide a direct readout of CLK-B pulse-width.
CLK-B
CLK-A
14
12
11
.001 μf
1/2-4528
A
B
15 8
Q
9
.001 μf
2
4
5
1/2-4528
A
B
1
Q
7
V DD
T
R
C
L
V SS
3
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
1.20122.0620000 CONTACT BLOCK LAT 2NO
1.20122.0020000 CONTACT BLOCK MOM 2NO
561-1201-050 LED 5MM VERT LOW CUR YELLOW PCMT
561-1101-090 LED 5MM VERT LOW CUR RED PC MNT
3020-01096-0 SHUNT CURRENT DC 50A/50MV
561-1101-080 LED 5MM VERT LOW CUR RED PC MNT
561-1101-070 LED 5MM VERT LOW CUR RED PC MNT
561-1101-050 LED 5MM VERT LOW CUR RED PC MNT
相关代理商/技术参数
HWK481224 制造商:Hubbell Wiring Device-Kellems 功能描述:CAB, ACCESS,QUADCAB,MTG RAIL KT,12-24,4'
HWK-50-000/A 功能描述:BEZEL PANEL FOR HWK50000 RoHS:是 类别:工业控制，仪表 >> 配件 系列:* 标准包装:1 系列:Aero-Motive® 130117 附件类型:拖车带 适用于相关产品:标准盒式跟踪系统 其它名称:WM6183
HWK60000 功能描述:KIT BEZEL WITH PC BOARD & CABLE RoHS:是 类别:工业控制，仪表 >> 配件 系列:* 标准包装:1 系列:Aero-Motive® 130117 附件类型:拖车带 适用于相关产品:标准盒式跟踪系统 其它名称:WM6183
HWK6M6 制造商:Hubbell Wiring Device-Kellems 功能描述:CAB, ACCESS,QUADCAB,MTG RAIL KT,M6,2'H
HWK70000 功能描述:CABLE ASSEM FOR MDM SERIES RoHS:是 类别:工业控制，仪表 >> 配件 系列:* 标准包装:1 系列:Aero-Motive® 130117 附件类型:拖车带 适用于相关产品:标准盒式跟踪系统 其它名称:WM6183
HWK9M6 制造商:Hubbell Wiring Device-Kellems 功能描述:CAB, ACCESS,QUADCAB,MTG RAIL KT,M6,3'H
HWKF120 制造商:Hubbell Wiring Device-Kellems 功能描述:CAB, ACCESS,QUADCAB,FAN KT,120VAC
HWKF230 制造商:Hubbell Wiring Device-Kellems 功能描述:CAB, ACCESS,QUADCAB,FAN KT,230VAC