conrad / voltcraft vc870 - Page 1
Forum section: electronics / testgear

author: mullecy
author_rank: Contributor
timestamp: February 09, 2015, 11:56:27 am
content: Seems to have-ok input protection and-good precision: 0.1%-but only in VDC!, VAC is ok, but ohms/amps... are like 1 or 2% !-but a bit expensive (170Euros but I had it with 20% discount so 136E) but less than a 450E (seen at 550E and even 600E) fluke87V in Europe...-probes are just ok but not great-beeps if you don't use the right connectors (like plug in A for V measure)-min max but min seems to be bugged-W but only for mains and medium load 0.1W - 2500W for 10s (see Uni-T UT71E video, it has almost the same adapter)-but slowest continuity test ever (like 0.5s) !fromhttp://www.produktinfo.conrad.com/datenblaetter/100000-124999/124603-an-01-ml-VOLTCRAFT_VC_870_DMM_de_en_fr_nl.pdfCode:Technical DataSymbol . . . . . . . . . . . . . . . . . . . . . . . . .Max. 40000 counts (characters)Measuring rate . . . . . . . . . . . . . . . . . . .Approx. 2-3 measuring operations/second, Bargraf approx.10 measurements/secondmeasuring line length . . . . . . . . . . . . .Approx. 90 cm eachMeasuring impedance . . . . . . . . . . . . .>10M? (V range)Operating voltage . . . . . . . . . . . . . . . .9V block batteryWorking conditions . . . . . . . . . . . . . . .0 to 30°C (<75%rF), >30 to 40°C (<50%rF)Operating altitude . . . . . . . . . . . . . . . .max. 2,000 mStorage temperature . . . . . . . . . . . . . .-10°C to +50°CWeight . . . . . . . . . . . . . . . . . . . . . . . . .Approx. 380 gDimensions (LxWxH) . . . . . . . . . . . . . .185 x 91 x 43 (mm)Over-voltage category . . . . . . . . . . . . .CAT III 1,000 V, CAT IV 600 V, contamination degree 2Measurement tolerancesStatement of accuracy in ± (% of reading + display error in counts (= number of smallest points)). The accuracyis valid for one year at a temperature of +23°C ± 5°C, and at a relative humidity of less than 75 %, noncondensing.Temperature coefficient: +0.1 x (specified accuracy)/1°CDirect voltageRange Accuracy Resolution400 mV ±(0.1% + 8) 0.01 mV4 V 0.0001 V40 V ±(0.1% + 8) 0.001 V400 V 0.01 V1,000 V ±(0.2% + 8) 0.1 VOverload protection 1,000 V; Impedance: 10 M?Alternating voltageRange Accuracy Resolution4 V 0.001 V40 V ±(1.3% + 5) 0.01 V400 V 0.1 V750 V ±(2.0% + 5) 1 VFrequency range 45 – 1 kHz; Overload protection 750 V; Impedance: 10 M?TrueRMS in the measuring area of 10 – 100%: Crest factor: max. 3.0 (at 750V max. 1.5)61Direct currentRange Accuracy Resolution:400 ?A 0.01 ?A4000 ?A ±(0.7% + 15) 0.1 ?A40 mA 0.001 mA400 mA ±(1.0% + 13) 0.01 mA10 A ±(2.0% + 7) 0.001 AOverload protection: Fuse, measuring time limit > 5 A: max. 10 s with 10 min breakAlternating currentRange Accuracy Resolution:400 ?A 0.1 ?A4000 ?A ±(1.6% + 5) 1 ?A40 mA 0.01 mA400 mA 0.1 mA10 A ±(2.6% + 4) 0.01 AOverload protection: Fuse, measuring time limit > 5 A: max. 10 s with 10 min breakFrequency range 45 – 1 kHz; Overload protection 750 VTrueRMS in the measuring area of 10 – 100%: Crest factor: max. 3.0 (at 750V max. 1.5)ResistanceRange Accuracy Resolution:400 ? ±(1.0% + 13) with REL function 0.01 ?4 k? ±(0.7% + 15) 0.0001 k?40 k? 0.01 k?400 k? ±(0.7% + 5) 0.1 k?4 M? 0.001 M?40 M? ±(2.0% + 7) 0.01 M?Overload protection 1,000V; Measuring voltage: Approx. 0.3 VCapacityRange Accuracy Resolution:40 nF ±(3.3% + 26) with REL function 0.001 nF400 nF 0.01 nF4 ?F ±(2.6% + 26) 0.0001 ?F40 ?F 0.001 ?F400 ?F 0.01 ?F4 mF ±(6.5% + 26) 0.0001 mF40 mF Not specified 0.001 mFOverload protection 1,000VFrequencyRange Accuracy Resolution:10 Hz to 40 MHz ±(0.1% + 5) 0.001 Hz to 0.001 MHz400 MHz Not specified 0,01 %Overload protection 750VSensitivity (10 Hz – 40 MHz): 200 mV; Amplitude max. 30 Veff (ms)DC loop current measurementRange Accuracy Resolution:0 – 100 % ±(1.3% + 2) 0,01 %Overload protection 1,000VTemperatureRange Accuracy* Resolution:-40 to +40 °C ±(2.6% + 33)+40 to +400 °C ±(1.3% + 20) 0.1 °C+400 to 1000 °C ±3,3%* without sensor tolerance63Diode TestTest voltage Resolution:Approx. 4.3 V 1 mVOverload protection: 1,000 VAcoustic continuity testerTest voltage Resolution:Approx. 1.2 V 0.01 ?Overload protection: 1000 V, measured range max. 400 ? ; <20 ? continuous soundPower measurementFunction Range Accuracy Resolution:Real power “W“ 2500 W ±(2,6% + 13) 0.1 WApparent power “VA” 2500 VA ±(2.6% + 14) 0.1 VAVoltage “V” 250 V 0.1 VCurrent “A” 10 A ±(1.3% + 13) 0.1 AEffective factor “Cos-Phi” 1 0,001Frequency “Hz” 50/60 Hz 0.1 HzDo not exceed the maximum permitted input values. Do not touch any circuits orparts of circuits if they can have higher voltages than 25 V Acrms or 35 V DC. Dangerto life!

author: mullecy
author_rank: Contributor
timestamp: February 09, 2015, 01:08:35 pm
content: It seems that probes suffer from a thin oxidation layer and if you don't use the groove or the tip (not sharp by the way), it's like you have up to hundreds of ohms resistor in series...I was pressing quite a lot on the probes...I was able to get less than 0.1Ohms only-on the grooved part or-if pressing like crazy (but that was not stable)

author: mullecy
author_rank: Contributor
timestamp: March 01, 2016, 02:04:26 pm
content: I have also discovered a bug in the min max function in DC V mode: when you press the button it resets the adc or some circuit and the minimum is 0 or some intermediate value (with v>0) (for v <0 the max is wrong...)I think I'll send it for a repair/firmware update...