Which type of resistor used in this circuit?

[onemilimeter]

LTA100P/SP1 is a current transducer. It is configured to give a secondary output current as shown in attached figure below. Part of the hardware circuit is also shown on the right of the figure below. Clearly, the Rmeas is 25 ohm and it is implemented by paralleling four 100 ohm resistors. What type of the resistors used to form the Rmeas?

Cheers.

[Kiriakos-GR]

I have the feeling that those are made by Vishay Dale.
Type ?   not wire because the accuracy can not be that high. 

[lowimpedance]

They  are 0.1% rc55 type (look in RS Farnell etc) , quite a few manufactures of these. Needed in precision ccts like filters inst. amps etc.
Come in many 'unusual' values.
John

[Zero999]

Come in many 'unusual' values.

They're typically found in E96 values and possibly E24 too. The usual cheap 5% tolerance resistors are typically only found in E24 values as well as special values such as 50 Ohm and 4 Ohm, 8 Ohm  which are used as RF and audio dummy loads.

E96 (  1%): 100  121  147  178  215  261  316  383  464  562  681  825
                  102  124  150  182  221  267  324  392  475  576  698  845
                   105  127  154  187  226  274  332  402  487  590  715  866
                    107  130  158  191  232  280  340  412  499  604  732  887
                     110  133  162  196  237  287  348  422  511  619  750  909
                      113  137  165  200  243  294  357  432  523  634  768  931
                       115  140  169  205  249  301  365  442  536  649  787  953
                        118  143  174  210  255  309  374  453  549  665  806  976
http://en.wikipedia.org/wiki/E96#E_series

[alm]

Making 5% resistors in E96 is mostly an exercise in statistics. Unless you're measuring a large number of samples, you wouldn't be able to tell whether they were rounded to the nearest E24 value.