amm-te ammeter manual
TRANSCRIPT
AMM-TE ammeter Manual I. Kit Details
Kit Name: Ammeter Kit Kit Model: AMM-TE
PCB Size: 70.6 * 39mm Screen size: 51 * 24mm
Electrical parameters
Operating voltage: DC5V Operating Current: 35mA Accuracy: ± 1mA
Measurement range: 0 ~ 2A Outrange display: the first data 1 or -1
Display color: red
Ⅱ.Circuit
Diagram
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 202122232425262728293031323334353637383940
U1
ICL7107CPLZ
E D
V C PBAVFG
DS1
E D
V C PBAVFG
DS2
E D
V C PBAVFG
DS3
E D
V C PBAVFG
DS4
1G VC 1C1C 1P
2G 2F VC 2A 2B
2E 2D 2C 2P
3G 3F VC 3A 3B
3E 3D 3C 3P 4E 4D 4C
4G 4F VC 4A 4B5V
4D 4C 4B 4A 4F 4G 4E 3D 3C 3B 3A 3F 3E 2D 2B 2F 2E 1C 1G
2G2A2C3G
C1101
C4
474 C5
224
R12K
R4
100K
R256K
R747K
C2104
VR1
1K
12
3U2
TL431A
R92K
5V R61M
R5
1 2J1
C3103
Q1
C1815
R820KR3
100R
L1 2.2mH
C610UF/25V
C710UF/25V
5V
5V VC
C8104
12
J2 5V
�益奇 子
ZD1
5V1
D1
1N4148
D3
1N4148
D21N4148
R10270R
� � �小 点
200
20
2
III. Circuit Principle
AMM-TE ammeter is mainly composed of ICL7107, the power supply circuit, a reference voltage source,
the input circuit and display circuit.
1. ICL7107 is a BCD output of the integrator Type A / D converter chip, contains internal linear
amplification, analog switches, vibration, display drivers and other components.
2. The power circuits into positive and negative supplies, the positive supply by the J2 input, C8 filter;
negative power from the R8, Q1, L1, C6, C7, D2, D3 and ZD1 like, -5V voltage generated by the chip 26
feet input.
3. The reference voltage source is R1, R2, VR1, R9 and U2 constituted 36 feet for the reference voltage
input pin, VR1 potentiometer to adjust the voltage of 100mV to 36 feet.
4. Enter the circuit J1, R5, R6 and C3 constitute, by measuring the current flowing through the circuit R5,
it will produce a voltage on the R5, R6 after the voltage by limiting the input to the chip 31 feet for the
treatment, C3 as input voltage filter capacitor.
5. The circuit consists of DS1 ~ DS4, D1, R3 configuration, four digital tube directly driven by the chip,
R10 is DS1 ~ DS3 These three LED point limiting resistor.
IV. Finished debugging
1. Access DC 5V voltage (note polarity), or a digital display -.000 .000 is normal.
2. Use a multimeter to measure voltage chip 36 feet and 35 feet between the regulator VR1
potentiometer, so this is the pressure of 100mV can.
V. The key point voltage reference value
1. The chip 1 foot and 21 feet - voltage 5V
2. The chip 36 feet and 21 feet - voltage 100mV
3. The chip 26 feet and 21 feet - voltage -5V
Parts list Note: Since the batch is not the same, could lead to some elements out of stock, it will be replaced with similar functions components There are some differences between the products and the list! Use the material object as the standard!
Name Model/specific
ation
Serial
numbe
r
Quantit
y
Name Model/specificati
on
Serial
number
Quantit
y
5-color
resistance
0.1R 2W R5 1 diode 1N4148 D1 D2
D3
3
2K R1
R9
2 voltage-regulat
diode
ST5V1 ZD1 1
56K R2 1 Transistor C1815 Q1 1
1M R6 1 inductance 2.2mH L1 1
4-color
resistance
100R R3 1 Digital tube 1bit common
positive RED
DS1~DS
4
4
270R R10 1 integrated
circuit
ICL7107 U1 1
20K R8 1 TL431A U2 1
47K R7 1 Potentiometer 3296 1K VR1 1
100K R4 1 IC socket 40P U1 1
Monolithic
capacitors
101P C1 1 terminal 2P vertical type J2 1
104P C8 1 301-2P J1 1
474P C4 1 power line 2Psingle-end 1 1
CBB
capacitance
104P C2 1 PCB board 70.6*39mm 1 1
224P C5 1 light filter 1 1 1
Dacron
capacitan
ce
103P C3 1 outer skin 79*43mm 1 1
electrolytic
capacitor
10uF/25V C6
C7
2 screw M1.7*6 4 4
Production steps
Before welding please carefully read the following steps, some of the installed components must be the order, this may
lead to the production of unsuccessful!
1. welding two colored ring resistance (color ring color is red dark brown brown, the same colors of the two resistance)
2. Welding a colored ring resistance (green blue black red brown)
3. Welding a colored ring resistance (brown black black yellow and brown)
4. Welding five four-color ring resistance
R3 color is brown black brown golden
R4 color is brown black yellow gold
R7 color is yellow purple orange gold
R8 color is red, black and orange gold
5. Welding three diodes, three of the same model (with direction)
D1 D2 D3 model: 1N148
6. welding a Zener diode (directional)
ZD1 model: ST5V1
7. welding a color ring inductance (color ring color is red red red silver)
8. welding three monolithic capacitors
9. Deal with the IC socket like this:
10. Place the 1st row in the red box installation position (directional)
11. Welding the 1st header row, install the four digital control (with directions)
12. After welding finished four digital tube, cut off the excess pin digital
13. Welding on the 2nd row home (with directions)
14. Welding a transistor and a reference voltage regulator chips (with direction, and note to distinguish models)
Q1 model: C1815
U2 model: TL431A
15. Welding 2 CBB capacitors and two electrolytic capacitors (electrolytic capacitors have direction)
16. The welding a sampling resistor
17. The welding a potentiometer and a polyester capacitor (potentiometer directional)
18. welding power socket and input socket (both with directions)
19. Install the IC, plug in the power cord (with direction), short circuit decimal point selection joints.
20. Test Procedure:
1) Use DC 5V voltage (note polarity), digital display -.000 or .000 is normal
2) Adjust the VR1 potentiometer, so between 36 feet and 35 feet voltage is100mV
21. Locking four screws, finished produced.