Maintenance And Calibration; Technical Data, Measurement Tolerances - Conrad VC444 Bedienungsanleitung

Maintenance and calibration

To guarantee the accuracy of the multimeter over a long period of ti-
me, it should be calibrated once annually. Fuse replacement is de-
scribed under "Changing the fuse" above. To clean the unit and the
display window, use a clean, lint-free, anti-static, dry cleaning cloth.
Do not use any carbonaceous cleaning agents or
petrol, alcohol or similar for cleaning. They can
attack the surface of the measuring instrument. Ad-
ditionally, the fumes are explosive and endanger
health. Do not use any sharp-edged tools, screwdri-
vers, metal brushes or similar for cleaning.
Technical data and measurement tolerances
Technical data
Display ..................................: 3 1/2-digit LCD display to 1999, with
Measurement rate .................: 2.5 measurem. per second max.
Max. input current DC ...........: 10 A for 10 s duration max.
Operating temperature ..........: 0°C to +40°C
Storage temperature .............: -10°C to +50°C
Relative humidity ..................: 80 % max., non-condensing up to
Temperature for guaranteed
accuracy................................. +23°C ±5 K
Battery type...........................: 9V PP3 or equivalent (alkaline)
Weight ...................................: approx. 150 g (without accessories)
Dimensions............................: approx. 74 x 129 x 39 mm
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automatic polarity display, digit
height 12 mm
31°C, falling linearly to
50% max. non-condensing from
31°C to 40°C
(W x H x L) (without leads)
Measurement tolerances
Accuracy specified in ±(% of reading + number of digits)
Accuracy for 1 year at a temperature of +23°C ±5K, at a relative
humidity of less than 75%. The warm-up time is approx. 1 minute.
Operating Measurement
mode range
DC voltage 200 mV
2 V
20 V
200 V
600 V
AC voltage 200 V
600 V
DC current 200 µA
2000 µA
20 mA
200 mA
10 A
Resistance 200 Ohm
2 kOhm
20 kOhm
200 kOhm
20 MOhm
Measurement voltage at open circuit being measured : < 3 V
Diode test Test current: 1.0 mA DC max.
Test voltage: 3 VDC max.
Transistor test range ..............: hFE 0 - 1000
Base current...........................: approx. 10 uA
Vce (Uce)...............................: 3 V max.
Accuracy Resolution
±(0.5%+2dgts) 100 uV
———"——— 1mV
———"——— 10 mV
———"——— 100 mV
±(0.8%+2dgts) 1 V
±(1.2%+10dgts) 100 mV
±(1.2%+10dgts) 1 V
±(1.0%+2dgts) 100 nA
±(1.0%+2dgts) 1µA
±(1.0%+2dgts) 10 µA
±(1.2%+2dgts) 100 µA
±(2.0%+5dgts) 10 mA
±(0.8%+5dgts) 0,1 Ohm
±(0.8%+2dgts) 1 Ohm
±(0.8%+2dgts) 10 Ohm
±(0.8%+2dgts) 100 Ohm
±(1.0%+5dgts) 10 kOhm
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