 | | | | | | | | | | | | | | | Max display is 1999 | | | AUTO ZERO function | | | 7 Segment LED Display | | | Case size by Din standard | | | Exclusive use for display | | | | | | | | | | | | | | | | | 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 | | | | | | | | | | | 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% | | |
| | | | | | | | | | | | | | | | | | | | | | Measuring method of AC voltage | | | | | | When measuring voltage V1 is below AC400V | | | | | | | | ※ V2= | | (When measuring voltage V1 is above AC 400V) | | | | ※ When voltage intended for measurement is above AC 400V, use a potential | | | | (V2 voltage shall be below the max. measuring voltage) | | | | | | Measuring method of DC voltage | | | | | | | | | When measuring voltage V1 is below DC300V | | | | | | | ※ V2= | | (When measuring voltage V1 is above AC 400V) | | | | ※ When voltage intended for measurement is above DC 300V, decide R1, R2 resistance | | | | 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. | | | | That is, when measuring input terminal is open or short-circuit, " 000 " in indicated. | | | In the case that abnormal letter appear when input is applied, it is because the | | | | voltage by using magnification resistance. | | | When measuring DC voltage, if measuring voltage is above DC300V, separate input | | | | voltage by using magnification resistance. | | | When measuring AC voltage, if measuring voltage is above AC400V, set the | | | | secondary voltage as below 400V by P.T Indication value mentioned as basic spec | | | | has 1:1 relations of measuring input and indication value. | | | | ex) Input : 0 ~ 200V Indication : 0 ~ 199.V Spec number : No. 4 | | | | | | | | | | | | Measuring methods of voltage of current in AC are divided into two methods, average | | | | value(AVG) reading method and root mean square(rms) reading method. User can | | | | choose any method depending on his own judgement. Generally, AVG and rms | | | | measurement have a difference of approx 1.1 times. | | | | Yongsung is manufacturing rms indicating type for paractical . | | | | | in regualr wave | | | | | | (AVG)=0.637Vm(but, Vm is max value) | | | | Definition of average value : the method taking-out average value by each half-circle in AC wave form. | | | | | | | Measuring result value of distorted wave form in measuring average value | | | | In the case of measuring average value, deviation of indication value can be severe | | | | according to the distortion rate of wave form. Wave form which is close to the regular | | | | wave has a little deviation in AVG or rms. | | |
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