bids are invited for programmable ac and dc electronic load-part 1 - power rating:4500w or above, (preferably 15 kw rated unit), programmable,ac voltage range: 50v~350v rms, 500 vpeak,dc voltage range: minimum: 7.5v or below, maximum: 500v or above,frequency: dc, minimum ac frequency from 45hz to 440hz,operation modes: independent units in parallel of equal power, and 3 phase configured operation , programmable ac and dc electronic load-part 2 - power factor range for ac mode: 0~1 both lead or lag,dc loading mode: cc, cr, cv, cp for dc loading,ac loading modes: constant and rectified load modes,analog voltage and curren monitoring modes,accuracy levels:- for constant current mode: 0.1% + 0.2% f.s. or better,-for constant resistance mode: 0.5% + 0.5% f.s., or better,-for constant power mode: 0.2%+0.5% f.s. , programmable ac and dc electronic load-part 3 - measurements: v, i, pf, cf, p, q, s, f, r, voltage thd,protection: oc, ot, op protection, ov alarm,interfaces: preferably gpib & rs-232 interfaces , all in one pc - intel i5 processor or better, windows 10, 8 gb ram or above total quantity : 1