NT-501称重仪说明书 NT-502A=NT-505A称重仪使用手册
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INDUSTRIAL INDICATOR
------------------------------------MODEL : NT-500 SERIES
------------------------------------SERVICE MANUAL
Table of Contents
1. INTRODUCTION........................................................... PAGE 3
2. TECHNICAL SPECCIFICATION.................................... PAGE 3
3. OVERALL VIEW............................................................ PAGE 5
4. INSTALLATION & CONNECTION................................ PAGE 6
5. TEST MODE................................................................. PAGE 11
6. CALIBRATION MODE.................................................. PAGE 15
7. SET MODE................................................................... PAGE 18
8. SEALING METHOD...................................................... PAGE 31
9. SCHEMATIC DIAGRAM............................................... PAGE 32
10. P.C.B DIAGRAM.......................................................... PAGE 41
11. BLOCK DIAGRAM........................................................ PAGE 44
12. DESCRITION OF CONNECTOR PIN........................... PAGE 45
13. DATA SHEET............................................................... PAGE 47
14. PART LIST.................................................................... PAGE 55
15. EXPLODED VIEW......................................................... PAGE 60
16. ERROR MESSAGE & TROUBLE SHOOTING.............. PAGE 61
1. INTRODUCTION
The service manual is the specification for the NT-500 series. They have been designed with CAS reliability under rigid quality control and with outstanding performance.
This manual includes basic technical about composition of hardware and program function. 2. TECHNICAL SPECIFICATION
■ Analog Part & A/D Conversion
Load Cell Excitation Voltage DC 9V, 8 x 350Ω load cells
Zero Adjustment Range 0.05mV 20mV
1.2µV/D (H-44,OIML)
Input Sensitivity
0.6µV/D (Non H-44,OIML)
System Linearity Within 0.01£ of F.S.
A/D Internal Resolution 1 / 200,000
5,000 dd (H-44,OIML)
A/D External Resolution
10,000 dd (Non H-44,OIML)
A/D Conversion Speed Maximum 50 times/sec
■ Digital Part
Span Calibration Full Digital Calibration : SPAC TM (Single automatic span calibration)
Display VFD (7 digit) : 6.0(W) x 13.0(H) mm
Sub Display (NT-505A)VFD (12 digit) : 3.3(W) x 8.0(H) mm
Division
×1, ×2, ×5
Display Below Zero Minus
Tare Subtraction Full capacity
"ST"(Stable) ▼ LAMP Weight is stable
"HIGH" ▼ LAMP Displays on/off status of high limit relay – Except NT-501A "LOW" ▼ LAMP Displays on/off status of low limit relay – Except NT-501A "HOLD" ▼ LAMP Hold function is activated