Multivalued electrical DC resistance standard R3026/1 (R 3026/1, R-3026/1)
Р3026-1 is designedto be used as avariableresistance inDC measurements. Which provides installation of resistance values with the help of 7 decadal switches from 0.01 ohm to 111111.1 ohm.
Accuracy class: 0.002
Multivalued electrical DC resistance standard R3026/1 (MEDCRS Р3026-1) R3026/1 accuracy class 0.002 is designedto be used as avariableresistance inDC measurements.Р3026-1, designedfor areas withtropical climate, should be marked as: Р3026-1 04.I*.
Р3026-1 isdesigned for operation under conditions shown in Table 1.
R3026/1 provides installation of resistance values with the help of 7 decadal switches from 0.01 ohm to 111111.1 ohm.
Accuracy class of R3026/1 - 0,002/1,5·10-6
Decades structure, Ohm: 1 decade - 10x10000 2 decade - 10x1000 3 decade - 10x100 4 decade - 10x10 5 decade - 10x1 6 decade - 10x0, 7 decade - 10x0.01
Nominal and maximum power dissipation per stage 1-st... 5-th decades is shown in Table 2.
Nominal powerdissipationfordecades 10x0.1 and 10x0.01 R3026/1 ofall accuracy classes is 0.01V, and maximum - 0.1V. Average value of the initial resistance R0 R3026/1, with installation of all decadal switches on zero readings, measured with the clamp 111111.1 Ohm does not exceed 0.01 Ohm.
Variation of initial resistance Δ R0 does not exceed 0.001 Ohm. Termocontact in the measuring circuit of unloaded P3026-1 in normal using conditions and installation of all decades for zero readings does not exceed 5 mkV. Normalized values of insulation resistance and electric strength insulation of P3026-1 are shown in Table 3.
Acceptable deviation limit δ of actual resistance values is determined in percentage from nominal by a use of this formula:
where R -nominal valueincorporatedresistance, Ohm.
Permissible resistance change of P3026-1 δn in percentage per year (instability) does not exceed values defined by the formulas shown in Table 4.
Where R – nominal valueincorporatedresistance, Ohm.
Acceptable additional error limit δt of P3026-1, expressed in percentage from nominal value of incorporated resistance changes in the power dissipation from nominal to any value, under normal using conditions and establishment of thermal equilibrium do not exceed maximum power and is equal to values defined by the formulas shown in Table 4.
Acceptable additional error limit of P3026-1 caused by changes in ambient temperature between top (lower) limit of normal temperature range and top (lower) temperature working conditions values is numerically equal to values determined by the formulas shown in Table 4. Dimensions of P3026-1 are not more than 485x250x240mm. Weight of P3026-1 does not exceed 11kg.
Photos: R3026/1 (Р3026/1)