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Max display is 1999 |
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AUTO ZERO function |
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7 Segment LED Display |
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Case size by Din standard |
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Exclusive use for display | | |
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YS VM46 | |
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| Model name |
VM46-A -□ VM46-D -□ |
| Measuring function |
Measuring of AC, DC Voltage |
| Rating voltage |
AC 110/220V 50/60Hz |
| Ca¢¯eAu¨ú¨¢¨¬?¥ì¢¯©öuA¡× |
rating voltage ± 10% |
| Permissible voltage variation range |
4VA |
| Power consumption |
7 segment LED display |
| Indication mode |
AC:F S+0.5% rdg ± 1 digitDC:F S+0.5% rdg ± 1 digit |
| Sampling frequency |
400ms |
| Response speed |
double integration method |
| Response speed |
approx. 2 sec (from 0 to Max.) |
| Max. Permissible input |
150% of spec. by each range |
| Display times |
2.5 times/sec | | |
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| Insulation resistance |
above 100 ㏁ (DC 500V Meg) |
| Withstand voltage |
AC 2,000V/min |
| Withstand noise |
surge wave noise by noise simulator(Pulse width 1 ㎲ ) ± 1KV |
| Vibration |
Withstand vibration |
10 ~ 55Hz(for 1 min of a cycle), double amplitude 0.75mm XYZ 1hr for each direction |
| Malfunction |
10 ~55Hz(for 1 min of a cycle), double amplitude 0.5mm XYZ 10min for each direction |
| Impact |
Withstand impact |
300 ㎨ (about 30G) |
| Malfunction |
100 ㎨ (about 10G) |
| Ambient temperature |
-5 ~ +40 ℃ |
| Relative humidity |
45 ~ 85% | |
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Measuring method of AC voltage | |
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When measuring voltage V1 is below AC400V | |
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※ V2= |
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(When measuring voltage V1 is above AC 400V) |
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※ When voltage intended for measurement is above AC 400V, use a potential |
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 (V2 voltage shall be below the max. measuring voltage) | |
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Measuring method of DC voltage | |
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When measuring voltage V1 is below DC300V | |
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※ V2= |
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(When measuring voltage V1 is above AC 400V) |
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※ When voltage intended for measurement is above DC 300V, decide R1, R2 resistance |
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value by using the magnification resistance so that V2 voltage may be below the max measuring voltage. | |
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All the types of voltmeter have auto zero function. |
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That is, when measuring input terminal is open or short-circuit, " 000 " in indicated. |
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In the case that abnormal letter appear when input is applied, it is because the |
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voltage by using magnification resistance. |
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When measuring DC voltage, if measuring voltage is above DC300V, separate input |
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voltage by using magnification resistance. |
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When measuring AC voltage, if measuring voltage is above AC400V, set the |
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secondary voltage as below 400V by P.T Indication value mentioned as basic spec |
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has 1:1 relations of measuring input and indication value. |
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ex) Input : 0 ~ 200V Indication : 0 ~ 199.V Spec number : No. 4 | | |
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Measuring methods of voltage of current in AC are divided into two methods, average |
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value(AVG) reading method and root mean square(rms) reading method. User can |
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choose any method depending on his own judgement. Generally, AVG and rms |
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measurement have a difference of approx 1.1 times. |
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Yongsung is manufacturing rms indicating type for paractical . | |
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(AVG)=0.637Vm(but, Vm is max value) |
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Definition of average value : the method taking-out average value by each half-circle in AC wave form. |
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Measuring result value of distorted wave form in measuring average value |
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In the case of measuring average value, deviation of indication value can be severe |
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according to the distortion rate of wave form. Wave form which is close to the regular |
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wave has a little deviation in AVG or rms. | |
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