RD-90high voltage meter

RD-90 DC and AC high voltage meter is designed to measure alternating sinusoidal and direct voltage, as well as to measure voltage at high-voltage outputs of step-up symmetrical transformers with a grounded midpoint, who work in installations for testing transformer oils.
High voltage meters RD-90 consist of:- high-voltage unit RD-90-BV with a power supply set;- indicator module RD-90-MI with a power supply kit;- stabilized power supply.
Specifications RD-90:DC voltage measurement range - from 10 kV to 100 kV.AC voltage measurement range (effective value) - from 10 kV to 90 kV.The frequency range for measuring AC voltage is from 47.5 Hz to 52.5 Hz.The input impedance of the high-voltage block RD-90 at direct current is from 340 MΩ to 380 MΩ.The input impedance of the high-voltage block on alternating current with a frequency of 50 Hz is not less than 270 MΩ.
Limits of permissible relative error when measuring stresses:- direct current - ±1%;- alternating current - ±1%.Supply voltage - from 4.8 V to 5.2 V.The duration of continuous operation of the RD-90 without recharging is at least 8 hours.The range of the radio channel is at least 5 m.Duration of continuous operation of RD-90 at input voltage:- no more than 40 kV - no more than 8 hours;- maximum - no more than 1 hour.
The time for establishing the operating mode after turning on the power is 1 min.Overall dimensions - 425×285×120 mm.Service life - not less than 10 years.Weight - no more than 9.5 kg.
Operating conditions RD-90:Indoors or under a canopy in the absence of shaking, vibrations, vapors of aggressive liquids:- ambient air temperature - from +10°С to +35°С;- relative humidity - up to 80%;- atmospheric pressure - from 630 mm Hg. Art. up to 800 mm Hg Art.;- coefficient of non-sinusoidality of the measured AC voltage - no more than 8%;- ripple coefficient of the measured DC voltage - no more than 1%;- distance from the RD-90-BV meter to conductive objects that are grounded or under potential - at least 0.1 m.