Device SHCH300 (SHCH -300, SHCH 300)
Designed to measure DC voltage and DC resistance at ambient temperature of 10 ° C to 35 ° C and with relative humidity less than 80% in laboratory and factory conditions.
I constant current (ranges: 0.1 mkA, 1 mkA; 10mkA; 100mkA, 1mA, 10mA, 100mA, 1000mA)
U constant current (ranges 1mV, 10mV, 100mV, 1V, 10V, 100V, 1000V)
R constant current (0.1 kOhm, 1 kOhm, 10 kOhm, 100 kOhm, 1MOhm, 10MOhm; 100MOhm, 1GOhm).
Combined digital devices SHCH300 (hereinafter - devices) are to measure DC voltage and DC resistance at ambient temperature of 10 ° C to 35 ° C and with relative humidity less than 80% in laboratory and factory conditions.
Devices SCH300 designed for areas with tropical climates (factory designation SHCH300 04.1 **), are designed to work in air-conditioned rooms.
Measurement limits, input resistance Rin on dc, voltage reduction UI at current measurement input, current I through measured resistance, acceptable basic error limit δод in extended up to 120% at all measurement ranges (except 1kV, 1A) are shown in Table 1.
on voltage - 0.1 mkV;
on current - 0.01 nA;
on resistance - 0.01 Ohm:
Maximum permissible additional error caused by changes in ambient temperature from normal to any temperature between 10 and 35 ° C is equal to acceptable basic error limit δод for every 10 ° C of temperature changes.
Device SHCH300 meets the requirements of acceptable basic error limit (listed above) at voltage changes from 198 to 242V.
Device SHCH300 in voltage measuring ranges withstands voltage for1min, equal to next higher measurement final value range on all ranges, except 1kV. At range of higher measured value - 1kV device can withstand voltage impact for 1 min, equal to 1.2 final value with overload value indication on device display "12000".
Measured current polarity and voltage is determined automatically. Measurement limit choice is carried out manually.
1. Uk, Ik, Rk-Higher limit of measuring range(hereinafter- measuringrange), Ux, Ix, Rx- valueof measuredvoltage, current and resistance.
2. Maximum acceptablebasic errorvalue in measurement rangewith higherlimit of 1mVis specifiedfor devicethat is underrated loadfor 3 hours, during the first2 hoursafter operating mode establishment basic acceptableerroris calculated by formula:
δ= ±[0,2 + 0,2(Uk/Ux-1)]
Device SHCH300has externaland automaticstarts. Countdownmeasurement resultmadeondeviceindicates measured currentand voltage polarity;five digits of reference; decimal point(dot). Attenuation of external interferenceis not lower than:
60 dB- tonormal type interfere, representing mainsvoltage frequency isappliedto devicesSHCH300 input is not more than100% of limitin the absence ofthe DC inputsignaland is not more than20% of limit when input dc signal is absent, equal tomeasurement limit.
Total input voltage signal and disturbances amplitude should not exceed 1000 V;
80 dB– for common mode disturbance, representing supplyingvoltage frequency appliedto devicesSHCH300 input, relative to caseatunbalanceinput1kOhm;
100 dB- for common mode disturbance, representing dc voltage appliedto devicesinput, relative to caseatunbalanceinput1kOhm;
Devices SHCH300 insulation stands for one minute test AC voltage with 50Hz frequency:
3kV - amplitude value - between input circuit and case;
1.5 kV RMS value - between power circuit and case.
Insulation resistance; 1000MOhm - between input circuit and case, 40 MOhm - between power circuit and case.
Electrical resistance between clamp "╧" and devices case does not exceed 0.5 Ohm. Devices operating mode setup time does not exceed 2 hours at limit of 1mV and 1hour, for rest ranges. Device SHCH300 retains all its metrological characteristics for 24 hours of continuous operation time, except operating mode setup time. Interval time for re-enable is - 1 hour.
Device SHCH300 continuous operation time without calibration and zeros setting, for which basic error should be within normal limit (listed above) is not less than 16 hours, except limit of 100nA, where continuous operation time without zero setting is at least 2 hours and value of 1 mV, at which continuous operation time without zero setting is at least a half of hour during first two hours of operation mode and one hour for subsequent work without shutting down.
Device SHCH300 providesinformation about measurement limit,value andpolarityof measuredparameters inbinary code8-4-2-1. Output signalsare representedin positivelogicand have logical level"1"from2.4 Vto 5.25V andlogical"0"from 0 to0.5 V.Tosynchronize thedevicewith external devices,deviceproducesimpulses of2-15msec. withamplitudefrom 2.4to 5.25V (record resolution) with repetition frequency(25± 0.5)Hz.
Devices SHCH300 power supplyis provided fromnetworkvoltage(220± 22)Vfrequency (50± 1) Hz. Maximum acceptableadditional errorcaused by exposure ofexternalhomogeneous magnetic fieldwith induction2mkT, sinusoidaltime-varyingwith power supply frequency is equal to a halfof maximum acceptablebasic error. SHCH300networkpowerconsumption at rated voltagedoes not exceed25 V A. Dimensionsdo not exceed110x317x317mm.Devices weight does not exceed6kg.
Photos SHCH300 (Щ300)