DAHUA DH1718D-E User Guide

Model

DHDHDH

l718

D(E)

Two-Way

Tracking

CVCVCV

///

CCCCCC

Power

User

Supply

Manual

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sss

Manual

hhh

uauaua

Company

DaDaDa

Electronic

ofofof

Electronic

Instrument

ininin

Beijing

2

111

...

DDD

escr1ption

CONTENTS

Performances

2.2.2.

Performances

Operating

3.3.3.

Operating

Configuration

4.4.4.

Configuration

Applications

5.5.5.

Applications

Maintenance

6.6.6.

Maintenance

Completeness

7.7.7.

Completeness

Storage

8.8.8.

Storage

Princip

and

Specifications

and

Specifications

lelele

Quality

9.9.9.

Quality

Guarantee

3

1.1.1.

Model

DH1718-2

DH1718-3

DH1718-4

DH1718-5

Output(two-way)

Voltage

0-32V

0-60V

0-32V

Current

0-2A

0-1A

0-3A

0-5A

Input 220V ± 10%, 50Hz ± 5 %

<

250VA<250VA<400VA<600VA

Load Effect

CV

1 × 10

-4

+ 2 m V

2 × 10

-4

+ 2 m V

5 × 10

-4

+ 2 mV

5 × 10

-4

+ 2 mV

CC

20mA

Source Effect

CV

1 × 10

-4

+ 2 mV

2 × 10

-4

+ 2 mV

5 × 10

-4

+ 2 mV

5 × 10

-4

+ 2 mV

CC

1 × 10

-4

+ 5 m A

2 × 10

-4

+ 5 m A

5 × 10

-4

+ 5 m A

5 × 10

-4

+ 5 m A

Ripple and Noise (rms)

CV

0.5mV

1mV

2mVCC1mA

5mA

10mA

Output Setting Resolution

(typical)

CV

20mV

40mV

20mV

CC

50mA

25mA

70mA

120mA

Mutual Effect

CV

5 × 10

- 4

+ 2 mV

5 × 10

- 4

+ 2 mV

5 × 10

- 4

+ 2 mV

5 × 10

- 4

+ 2 mV

CC

< 0.5mA

Tracking Error

5 × 10

- 3

± 2 mV

Transient Recovery Time

20

mV;

50 μ s

Indicating Accuracy of Meter

Voltage

2.5 grade (D)/± 1%rdg + 6dgts (E)

Current 2.5 grade (D)/± 2%rdg + 10dgts (E)

Temperature Range

Operating Tempera 0 ℃ ~ + 40 ℃

Storage Temperature 5 ℃ ~+ 45 ℃

Reliability MTBF( θ )

≥ 5000H

Cooling Mode

Natural Ventilation

Dimensions (mm)

205(W) × 160(H) ×

( L)

305

500

Weight (kg)

About99915

escr1ption

DDD

escr1ption

Mode1 DHl718 D(E)

T

w o-

W

ay CV/CC Tracking Power Supp1y is general-purpose one for laboratories. I t h as functions of CV/CC operations. These modes c an convert automatically with change of a load. In addition, DHl7l8 also has a se r ies master-s1av

e

operation function, one way on the 1eft is master way, the other on the right is slave way, in tracking state, the output voltage of the s lave way changes with the master way, there f o re it is especially suitab le for desired symmetry and tunable bipolarity power supp ly . For example, Every way of DHl718 D(E)-2 can provide output of 032V,

0-2A DC current. In series operation or series tracking operation, it can provide outputs of 0-64V ,

0- 2A or 0- ±

32V,

0-2A single polarity or bipolarity power supp ly . The output of every way has a high Q magneto-electric m eter as an output parameter indication . This power supply has characteristics of convient and effi c ient uses not fear to short, keepi n g constant current in s h o r t circuit. There is a grounded binding post at the output termina1 of every way on the panel; this grou n d e d binding post ca n connect the powe r supp

l

y wit h grounded potential of user systems. Overa ll output power is more than l24W. Mode

l

DH17l8 D(E) desig n is new reaso n able and beautifula n dits color is unique. It is especially used in the fields of laboratories, production scientific research, experiments and teaching. This power supply has won a good reputation among users owing to its excel1ent performance / price ratio. Before you operate this power supply, please read this operating manua1 carefully.

Performances

2.2.2.

Performances

and

Specifications

and

Specifications

4

3.Operating

A

Jiomax

Transformer

Relay Switching and

Aux. Supply Circuit

Output Switch Circuit

Reference

Voltage

DC

Voltage

Sampling

Rectify

and Filting

Series

Setting

Amplify

Gate

-

CC

Diff

Ampl+-CVDiff

Ampl

+

AC

220V

Meter Circuit

Current

Sampling

Figure 1

CC

IoIomax

Kvomax

Vo

EDC

CV B

A

R

< R

RL=R

C

RL> R

C

Figure 2

V

omax

0

3.Operating

Principle

(((

1)1)1)

Switching

Principle

Because the changing range of the output voltage is bigger , the secondary of the transformer provides the output of AC voltage, after it is transferred then app1ied to the rectifier. This procedure is accomplished by the switching control circuit and driver circuit.

(2)

Mutual

(2)

Mutual

Transfer

Principle

ofofof

CVCVCV

Operation

///

CCCCCC

Operation

When CV is operating, the voltage comparison amplifier is in prior control state for the regulator. When the output current of CV operation reaches setting value of CC point, CC comparison amplifier is in prior control state for the regulator. The operati on mode of the circuit converts CV to CC. Fig 2 shows the characteristics of the switching procedure.

The load value of the conversion point is R When K = J, the max output power of the power supply is R constant.

= R

= KV

L

C

omax

/ I

, where 0 ≤ K/J ≤ 1.

omax

=R

=V

L

C

omax

/ I

. Setting that remains

omax

5

When K >J, the circuit is operating in C C state. The point

R1R

2

A2A1VOMV

OS

+-+

-

Figure 3

When K <J, the circuit is operating in CV state. The point Setting that K and J are constant, assuming they are all equal to 1, i.e R = J= l, R

A

will move to

A

will move to

A'

on B C line.

A'

on DE line.

varies, also the

L

circuit can be converted to the certain B point of CV operation line or certain E point of CC operating region. By above mentioned, we can know the crossover, point of CC / CV operating modes, they depend on the setting of the output parameters to change, suck as changing K and J values, on the other hand, they can be changed by changing the relation between the lo ad and critical load R

, but the mode

C

conversion is accomplished by the built-in electronic circuit itself at last. An ideal conversion region should be a point, but in fact, it is impossible, from the point of view of math, this is because in this point, the change of the output voltage or output current is discontinuousness , in practical conversion procedure, there is a conversion crossover region, of course ,

the smaller, the crossover region is, the better conversion characteristics of CV / CC are.

(3)

Adjusting

Circuit

The adjusting circuit is a series linearly controller, which is controlled by an error amplifier to adjust the output parameters linearly.

(4)

Comparison

Amplifier

For adjusting grade, the feeding mode of the comparison amplifier is full-float mode. The advantage of the circuit is that it has a wide adjustment range, high accuracy, simple circuit, high reliability and not fears to overload or short.

(5)

Reference

Source

It consists of a 2DW7 C type reference voltage diode with zero temperature coefficients ; it features simple, reliable circuit, high accuracy and stability.

(6)

Indicating

Circuit

It consists of two magnetic-electric meters with high sensitivity, which can be controlled by the key controllers on the panel. The indicating accuracy is 2.5 grades .

(7)

Operating

Principle

Series

ofofof

Series

Master-Slave

Tracking

The schematic diagram is shown as Figure3.

If R1 = R2, when the output voltage across the two input terminals is V

= 0, it must be V

in

= V

os

, i.e

omo

6

the output of the slave varies with the output changes of master.

L

N GND

GND

-+-

+

DH1718

Figure 4

Configuration

4.4.4.

Configuration

5.5.5.

Applications

(1)

Front

(1)

Front

Volt Amps Ammeter Indicating the output current V oltage V oltage setting Adjusting the output of CV Current Current setting Adjusting the output value of CC Tracking Tracking operation Series tracking operation knob Independent Non-tracking GND Ground terminal C a se grounded blinding post C onnect for tracking C onnection in Series short connection tracking operation line series tracking operation

(2)

Operating

(2)

Operating

l) The key on the left is a function selector of meter indication of the left way. When pressed, it will indicate the output current of this way otherwise, indicates the output voltage, the key on the right is the same as mentioned above.

2) The key in the middle is a tracking / normal selector switch, pressing the key, a short connection line is added between the negative output terminal of the left way and lh. positi'e and the positive terminal of the right way. After power on, the instr ument begins operation in master-slave tracking state.

3) The output voltage is set when the output terminal is open circuit; the output current is set when the output terminal is circuit-shorted.

(3)

Ground

(3)

Ground

1) G round schematic diagram or the power supply is shown in Fig4.

Panel

Connection

Show

V oltmeter Indicating the output voltage

Instructions

Method

7

Users can connect this power supply to ground or into their own system grounded potential according

W

1

W

2

W3W4W4W

3

W

2

W1master

slave

to their use cases.

2) 1 series operation or series master-slave tracking operation, in principle, one terminal of four output terminals of the two ways is only allowed to connect with the cabinet .

3) The benefit of ground connection is safe, further it can decrease ripples and harmful spurious wave and 50Hz interference caused by grounded, potential difference.

Maintenance

6.6.6.

Maintenance

1) Period Check: Should make period inspection after the instrument operation a long-time, the operating, performances of the unit would have some changes, therefore users should make inspection for this instrument. Procedure as below: a. Voltage and current output range b. Indicating accuracy of the meter

2) General Calibration a. Adjustable component functions of PCB (see Fig. 5 )

Fig ure 5

W1, Max. Range limit of the output voltage W2, Max. Range limit of the output current W3, Accuracy calibration of ammeter W4, Accuracy calibration of voltmeter b. Mechanical Zero Calibration of the Meter When the meter pointer deflected to mechanical zero point, a screw driver can be used to rotate “ Mechanical Zero ” button below the meter on the panel making it recovery. c. Ca1ibration of Output Voltage Range A

digital voltmeter is applied to the corresponding output terminal; the output voltage is set to max.

Then W1 is set to make the readings in the digital meter indicated to 32.5V ≤ V

omax

≤

32.7V, meanwhile, you can observe indicating value of the voltmeter such as the indication value of the deflected digital voltmeter and can trim potentiometer W4 in coincidence with the readings as possible . d. Calibration o f Output Current Range A

5W standard resistor is connected across the output terminal; the voltage output of the circuit under test on the panel is set to min, but the current output to max. The digita1 voltmeter is collected across 1 Ω resistor, again power is on, and the output voltage is set to max. Until the readings on the digital meter remain constant basically. At this time the circuit is operating in CC state, W2 is adjusted, the voltage on the digital meter is:

8

2.2V ≤ I

Model

DH1718-2

DH1718-3

DH1718-4

DH1718-5

Vomax

33V

61V

33V

Iomax

2.25A

1.25A

3.25A

5.25A

Model

DH1718-2

DH1718-3

DH1718-4

DH1718-5

Fuse

2.5A

2.5A4A5A

Meanwhile, should observe whether the current indication value of until is in ordnance with the readings on the digital meter, otherwise should trim W3.

NOTE:

specifications, the faults will occur.

7.7.7.

Overall DH1718 includes : l) DH17l8 (master) 1

2) Operating manual 1

3) Input fuse holder BG XP φ 5x 20 1

Connection strap for tracking operation

The output voltage and current can not be set too large, if the readings exceeded the given

Completeness

omax

'R (=l Ω ) ≤ 2.25V

Storage

8.8.8.

Storage

Model DH1718 should be stored at the temperature 5-45 ℃ , relative humidity ≤ 80% in vellti1ated room without smoke, gas, acid, alkali as well as gas and volatile solvent, dust.

Quality

9.9.9.

Quality

After delivery within l8 months, if users abide applications, but the quality is poorer than given specifications, our factory is responsible for repairs and replacement free of charge.

Guarantee

by

the regulations of transportation, storage and

DAHUA DH1718D-E User Guide

Specifications and Main Features

Frequently Asked Questions

User Manual