Hunan Tengfang Zhongke Technology Co., Ltd.

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PXI cable is how to buy?

We take the PXI switch board as an example, most of the switch boards used on the market are multiplexed, with 200PIN as the mainstream, mainly used to control large-scale high-density test systems. Tengfang Zhongke provides an overall solution around LFH200 from connectors to cables and junction boxes.

The last issue introduced the category of LFH200,

I believe everyone has a preliminary concept of the LFH200 family,

Then the next small series will be in the form of questions and answers

Description LFH200 for everyone

What does LFH mean?

The full English name of LFH is Low Force Helix, and the Chinese translation is: low insertion stress spiral connector. LFH was first proposed by MOLEX Company in the United States. The pins are arranged in a high-density rectangle to support the transmission of high-speed and high-density signals. Typical channels are 60PIN 160PIN and 200PIN, which is 4 pins wide and 15 pins/40 pins/50 pins long. The LFH200 we are talking about here refers to the low insertion stress spiral connector of the 4*50 matrix PIN pin.

What is the difference between S and C?

The main difference between model C and model S is that the line sequence twisted-pair relationship is different from the line sequence definition of LFH200 corresponding to DB50.

Section C

CH-COM twisted pair

The twisted-pair mode of paragraph C is as follows

C款.png

The line sequence relationship corresponding to DB50 is that each DB50 corresponds to multiple rows of LFH200. For details, please refer to the cable drawing.

C model adaptation PXI models are:

NI的PXI(E)2569/2570/2571/SCXI-1169

CH-COM twisted pair

The S-type twisted pair is as follows

S款.png

DB50 definition and LFH200 one-to-one correspondence, take turns to sort, specific can refer to the cable drawings.

S model adaptation PXI models are:

NI's PXI(E) 2575/SCXI-1175 and all Pickering boards

under what circumstances with m3 or 4-40 screws?

According to the current testing industry's mainstream board brand to score,

M3 Screw:Applicable to most American NI, Chinese products, China Altai brand board (generally the default hair M3 screw)

4-40 Screws:Refers to American 4-40 screws, suitable for most British Pickering brand boards

The rest of the brand boards need to be determined according to instructions or consultation.

In what cases are scattered lines used and in what cases are adapters used?

This mainly depends on the customer's usage:

1) Under normal circumstances, customers have fixed and mature tested parts. We recommend customers to turn male cables with male ends.

2) If the customer has a variety of tested parts and the required test signal points are also different, we recommend the male rotor female cable with a junction box.

200 to 200PIN

Cable junction box

200 to 4*50

Cable junction box

3) However, if the customer needs to plug and connect or there is no fixed wiring method for the tested product for the time being, then we will recommend the configuration of scattered lines.

under what circumstances with high temperature line?

1) The temperature coefficient of high temperature wire has little influence. When the temperature has a great influence on the test results, we recommend using high-temperature wires.

2) In the case that the customer himself is connected with scattered wires, it is recommended that the customer use high-temperature wires if he needs to connect multiple aerial connectors or almost full PIN.