1.Generally speaking, the package is cartons.
2. wooden case
3. according to your requirement
This instrument is professional test device for ITM(IFTM) and VTM(VFTM) of thyristors and rectifiers. It is applicable to the parameter testing of all kinds of thyristors, rectifiers and controllable/ rectifier modules.
Our product has advanced design and easy operation. The testing result is digital displayed with the advantage of accurate set data, high-precision testing and good repeatability.
The tester adopts energy storage type pulse discharging circuit. Testing principle meets the GB4024—83 standard and adds protection on the tested devices. It is the optimal testing instrument for the factory and end user of semiconductor devices.
2. Main technical data
2.1 ITM Testing Range
Type 013A: 30—3000A
Type 013B: 100—9000A
2.2 VTM Testing Range: 0—7V
2.3 Interval time of repeated testing: <6S
2.4 Running Condition
Power supply: AC 220V±10% 50HZ; Environment Temperature: 0—40°C
2.5 Complete consumption: <1.5KVA
2.6 Overall weight
Type 013A: about 35Kg
Type 013B: about 80Kg
2.7 Overall dimension
Type 013A: composed of two boxes, 440×440×150mm for each
Type 013B: composed of one box with 600×600×1000mm
3 Work principle (refer to circuit theory diagram)
3.1 circuit theory diagram
3.1 Main Circuit Principle
Thyristor T1 works as charging controlled switch. After switching on and fixing the current value, T1 is conducted and the power E to charge the energy-storage capacitor C. When charging to the set value, T1 is cut off. At this time, thyristor T2 is in the blocking state. When testing, T2 is conducted, C discharge to tested devices through T2, L1, the discharging current is half-sinusoid. The current depends on capacitor C. The value is sampling tested by shunt.
3.2 Controlling Circuit Principle
The 3-position current set the dial switch to produce 3 voltage values. After adding
together by voltage summator A, the setting voltage VC is produced, which is
proportionable with setting value and sent to comparator A1, A3 separately. The
voltage signal V0 of energy-storage capacitor C is sent to difference amplifier A2,
after cushion, it is sent to comparator A1. If A1 judge V0<VC, A1 send out high
electrical level, which makes T1 gate pole bear forward voltage to charge C. Until
V0> or =VC, A1 send out low electrical level to end T1.
After the low electrical signal of “TEST” reshaping through Schmitt trigger, it is sent to monostable trigger Ⅰ& Ⅱ. The pulse signal from monostable trigger Ⅰ is sent to gate pole T2 after magnified by power. After T2 is conducted, the energy-storage capacitor discharge, and produce the needed testing current in the output end. The current testing signal V1 is sent to comparator A3 and bumper A4. If A3 judge V1>VC, A3 send out high electrical level; on the contrary, A3 send out low electrical level.
The moment from high to low of A3 is detection moment. When A3 send out high electrical level, K1,K2 closed, the input voltage of A4 is added to the CM and send out through A5. When the output voltage on A3 changing from high to low, K1,K2 disconnect. A5 is voltage follower with high input impedance. Thus, the voltage on CM is the instant voltage value when K1 is disconnected. The output voltage on A5 equals to the voltage on CM all the time and output to ITM display meter. After the number on ITM display meter is confirmed, the monostable Ⅱ sends out high electrical level, which make the value of voltage display meter locked. The voltage sampled signal pass through A6 and A7. It is sent to VTM display screen with the same way of the current sampled signal. It is unnecessary to repeat here.
4. Structure Features
The instrument is divided into 2 parts—main and auxiliaries. In the panel of main
frame, there are switch, key, indicator light and display meter. In the rear cover,
there are three line power supply socket, fuse box (fuse: 3A/250V), and main &
auxiliaries connecting cable outlet. The tested device terminal blocks and sampled
terminal blocks are installed in the panel of auxiliaries. The connecting cable outlet
is also in the rear cover. The DBC-031B main and auxiliaries is installed in the
5.1.1The auxiliary cable connection
Before using, make sure the 2 boxes completely level (either keep apart or overlap is OK). Then, connect the main frame with the auxiliaries by the connecting cable. The main & auxiliaries of DBC-031B have been connected before leaving factory.
5.1.2Power line connection
For ensuring the testing precision and personal safety, the user must make sure the earth terminal of three-core power line plug connect with ground. The mentioned ground must be the safe ground in the term of electrician and can not be replaced by the water pipe.
5.1.3Testing line connection
The sectional area of tested device terminal outgoing line“A,K” should more than 0.025×ITM square millimeter. ITM is max testing current with the unit of Ampere. The length of outgoing line should less than one meter or, the testing current may not reach the setting value.
6. Fault and Recovery
6.1 If the light “battery charging” always keep bright but not turn dark and the auxiliaries has AC noise, it means the SCR or diode in the auxiliaries breakdown.
6.2 If the charging is normal, the instrument can not test after pressing “test”. It means the tested device has not been conducted.