Cmi700 Probe Description:

Hitachi Srp-4 Probe is used for CMI700 Series and CMI563 surface gauge, normally for Oxford and Hitachi thickness testing machine,  Standard tip (9.4mm spacing). SPR-4 probe have a replaceable tip, which will make the maintaince become easier and cost friendly.

Function

CMI700 SRP-4 probe (Micro-resistance probe) for measurement of PCB surface copper thickness. Includes 1 standard tip (9.4mm spacing). To be used for the CMI700 Series.

Oxford SRP-4 probe cooper thickness testing range：

Chemical cooper：10 μin – 500 μin (0.25 μm – 12.7 μm)

electroplating cooper：0.1 mil – 6 mil (2.5 μm – 152 μm)

lind with range：8 mil – 250 mil (203 μm – 6350 μm)

accuracy：±1% (±0.1 μm) according to standard plate

Accuracy

chemical cooper：standard deviation 0.2 %；

electroplating cooper：standard deviation 0.5 %

resolution：0.01 mils ≥ 1 mil, 0.001 mils <1 mil,

0.1 μm ≥ 10 μm, 0.01 μm < 10 μm, 0.001 μm < 1 μm

SRP-4 surface cooper probe working principle

Measured by the principle of microresistance, the SRP probe has four probes, the two probes on the outside are a constant current source, and the two probes on the inside are a voltmeter. When measuring, four probes must simultaneously contact the copper surface to form a loop. According to the formula R=U/I, the resistance R can be obtained, and then the copper thickness can be calculated according to R=p×L/S. It can be seen that the copper thickness at this time has a great relationship with the size of the cross-sectional area. Therefore, different standard pieces should be used to calibrate the surface copper of different widths.

Welltronics Technology is Hitachi(Original Oxford) agent in South China area, the cooper thickness test range produce as below: CMI95,CMI165,CMI500(CMI511),CMI700(CMI760),X-Strata 920 and their spare parts. Please feel free to contact us at any time.