| 品牌 : | GE/通用电气 | 加工定制 : | 否 |
| 产品认证 : | 已认证 | 输出频率 : | 2220kHz |
| 工作电压 : | 220V |
IC697ACC721
IC697ACC721
IC697ACC721
IC697ACC721
本系统以AT89S52单片机为控制器，通过人机接口(按键和LCD显示屏)来设置输出电流，设置步进等级1mA，并可同时显示预设电流值和实际输出电流值。
《联系人；欧先生》
《座机：0592-5709825》
《传真：0592-5917519》
《24小时热线：18030229053微信同步》
《QQ ：2479261344》
《QQ邮箱：2479261344@qq.com》本系统由按键设置输出电流值，经单片机计算后通过D／A转换器(TLV5618)输出模拟信号，再经过V／I转换电路转化成电流。单片机通过A／D转换器(MAX187)对采样电阻两端电压进行采样，经单片机处理，换算成电流值后显示在LCD屏幕上，供用户参考。实际测试结果表明，本系统输出电流可在20mA～1000mA范围内任意设定，精度±10mA，输出电流稳定，可应用于需要高稳定度、小功率恒流源的领域。
1、系统硬件结构
1．1系统原理
本设计采用模拟闭环控制。采用AT89S52单片机作为主控制器，用D／A转换器输出模拟电压信号，再经V／I转换电路获得电流。V／I转换电路依据电流串联负反馈原理，由运算放大器和大功率三极管组成模拟闭环，使输出电流稳定。
本系统可分为3个部分：电源部分、控制部分和V／I转换部分。电源不仅要提供±5V和±V供控制部分和V／I转换部分中的模拟器件使用，而且要提供大电压供V／I转换部分使用，且要有大功率输出的能力；控制部分的作用是根据用户设置值输出相应的电压信号；V／I转换部分的作用是把电压信号转化成相应的电流。各部分之间的关系如图1所示。
ABB 57298821 Ulma KB2/A Keyboard AB Stromberg
ABB MINIATURE CIRCUIT BREAKER K 2A 3 POLE K2A
NIB ABB 10HP CONTACTOR STARTER B12-30-10 240V COIL N736
ABB MINIATURE CIRCUIT BREAKER K 8A 3 POLE K8A
ABB Contactor EHW250C2P-1L EHW250C2P1L New
ABB Size 5 Welding Isolation Contactor EHW-250WC-1L
ABB 25A 3pole Circuit Breaker NICE SHAPE CLEAN
ABB CIRCUIT BREAKER S271-K25A MINI CIRCUIT BREAKER
FITS ABB REVERSING CONTACTOR 120V COIL REV-EH145-120V
NIB ABB KB30-2/BRC30-2 240V COIL B25/B30 CONTACTOR N753
ABB CBK-KLTPT1R RED PILOT LIGHT 120V/6V NEW
ABB Circuit Breaker S222-K10A
ABB MODEL 0ETL200K3-2 LOAD BREAK SWITCH 200A NEW
ABB CBK-MPIR1WF1 PUSHBUTTON WHITE ILLUMINATED 120V NEW
ABB S272 K6A 277/480VAC 2 POLE CIRCUIT BREAKER
ABB 57088443 MEM 86-192K + 192K RAM Memory DCG 3200-MR2
ABB AL9Z-30-10-15 Contactor, 24V-DC coil.
ABB MODEL CEL5-10 SIDE MNTG AUXILIARY CONTACT 1 NO NEW
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ABB S271K10A 10A Circuit Breaker
NEW ABB FANUC MOD 300 BUS MODULE 6203FP10800 GENIUS
ABB CBK-LTPT1G PILOT LIGHT GREEN 120V/6V NEW
ABB Circuit Breaker S271-K6A
ABB 1200A MOLDED CASE SWITCH
NIB ABB TA42 DU-25 ADJ THERMAL HEATER (18-25A) N758B
ABB Circuit Breaker S271-K2A
ABB Type B Contactor B16-30-22 24-28V NIB __B59.1
ABB Switching Power Supply 24V CP-24/0.5
NIB ABB TA25 DU-25 ADJ THERMAL HEATER (18-25A) N742A
ABB S282-K10A CIRCUIT BREAKER
ABB Circuit Breaker S222-K8A
ABB/Kem Flow Meter ZHM 02/1 ST.E.T 73877-08
ABB Circuit Breaker, # S271-K6A, WARRANTY
NEW ABB FANUC MOD300 BUS MODULE 6203FP10900 GENIUS
ABB Circuit Breaker S271-K20A
NEW ABB FANUC TAYMOD 300 32PT MODULE 6241BP10411 GENIUS
FITS ABB REVERSING CONTACTOR 120V COIL REV-EH300-120V
ABB S272 K8A 400V 8A 2 POLE CIRCUIT BREAKER
Size 5 contactor ABB A260-30
FITS ABB REVERSING CONTACTOR 120V COIL REV-EH175-120V
NIB ABB K22-2 10A CONTROL RELAY K22E 2NC/2NO 240V N738
NIB ABB TP180IA 10-180SEC TIMER BLOCK FOR RELAY N751A
AB 1326AB-B515G-21 1326ABB515G21 SERVO MOTOR 460V
ABB Contactor Relay KC40E-01 24V DC
ABB S272 K20A 400V 20A 2 POLE CIRCUIT BREAKER
Macbook PRO 15" C2D A1211 2.33 Palmrest Trackpad ABB
ABB S272 K16A 400V 16A 2 POLE CIRCUIT BREAKER
ABB OS30AJ12P Disconnect Switch 30A
ABB S282 K16A 277/480VAC 2 POLE CIRCUIT BREAKER
ABB CBK-LTL1G GREEN LED LIGHT 120/24V NEW
NEW ABB T25 DU-32 ADJ THERMAL HEATER (24-32A) N740C
ABB S272 K2A 400V 2A 2 POLE CIRCUIT BREAKER
ABB CONTACTOR A110-30 COIL 110/120 50/60 HZ NIB
ABB EHDB 280 EHDB280C2P-1L 280A DC 120V coil
ABB S3L100MW Circuit Breaker
ABB Control D.O.L. Motor Starter on Base DLA9-30-84
ABB CIRCIUT BREAKER ESB63020L 20 AMP 3 POLE NIB
NEW ABB 10A DIN 1P CIRCUIT BREAKER M/N S281-K10A N809
ABB S272 K25A 400V 25A 2 POLE CIRCUIT BREAKER
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NEW ABB POWER SUPPLY Model CP24/5.0 OEM 1SVR423416R0000
ABB MODEL PCU-03 PURGE CONTROL BOARD PCU03 NEW
ABB CIRCUIT BREAKER FAL34015
NEW FITS ABB/ASEA COIL KH145-1 120V CO-EH100/145-120V
ABB MODEL OESA250DV12PL1 SWITCH FUSE 250A NEW
ABB OK50FC Fast Contactor 50A OKX-OG11-U/50A
ABB S272 K40A 400V 40A 2 POLE CIRCUIT BREAKER
ABB CIRCUIT BREAKER ESB23020L 240v 20a 3PHASE
AC Adapter/Power Supply Cord for HP/Compaq DC395A#ABB
ABB MODEL E-32215 APMXB03 CARD MODULE NEW
ABB MODEL EH170AC CONTACTOR 300A 3 POLE NEW
BRAND NEW ABB 30MM PROXY
ABB ELFG-315 CONTACTOR 360A 500VAC/500VDC 200HP NIB
ABB, TYPE JS CIRCUIT BREAKER, 300 A, 500 VD
NIB ABB 16A DIN 2P CIRCUIT BREAKER F362-16/0.01 N812
ABB OVER LOAD RELAY NEW CAT#ISAZ11-1301-R0006
ABB MINIATURE CIRCUIT BREAKER B 25 2 POLE B25
ABB 279410A04, 2.8KV, 65A, 50K, COL Capacitor Fuse
ABB MS 325 MS325 690V Manual Motor Starter
ABB JSS63400L 400 Amp 3P 600V 10KAIC
ABB STARTER CONTACTOR A26N1-30-10-84 NEW A26N13084