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The VT Series are high-sensitivity electronic voltmeters designed for measuring the rms values of AC voltages. The VT-181 and VT-181E are basic models with a maximum sensitivity of 1 mV full scale (VT-181) or 300 μV full scale (VT-181E), measuring frequency band of 5 Hz to 1 MHz, indication accuracy of ±3% and 10 dB/step attenuator.
Voltage | 1mV to 300V, 12 ranges (1mV/3mV/10mV/30mV/100mV/300mV /1V/3V/10V/30V/100V/300V) full scale |
dB | -80dB to +50dB (0dB=1V) |
dBm | -80dBm to +52dBm (0dBm=1mW, 600Ω) |
Indication accuracy | Full scale ±3% max. (1kHz) level |
Frequency response (1kHz reference) |
5Hz to 1MHz ±10% 10Hz to 500kHz ±5% 20Hz to 100kHz ±2% |
Input impedance | 10MΩ ±5%, 45pF max |
Voltage regulation | ±0.5% of full scale with a ±10% variation in line voltage |
Maximum input voltage | At 400Hz:500V (DC+ACpeak) in 1V to 300V ranges 100V (DC+ACpeak) in 1mV to 300mV ranges |
Temperature coefficient | ±0.08%/°C |
Temperature for guaranteed spec. | 10°C to 40°C, 80% max. humidity |
Temperature for operation | 0 to 50°C |
Indication value variable range | 0 to Approx. -10dB |
Residual noise | 20μV and lower (1mV and 1V ranges) with input shorted |
Amplifier (AC) | |
Gain | Approx. 60dB |
Output voltage | 1Vrms±20% of FS (open circuit) |
1Vrms±20% of FS (open circuit) |
600Ω ±20% |
Distortion | 1% max. at full scale (1kHz) (specified in terms of S/N ratio for 1mV and 1V ranges) |
S/N | 40dB min. at full scale |
Frequency response | 5Hz to 500kHz (±3dB) |
line voltage | 100V, 120V, 220V, 240V (VT-181E: 230V) AC, ±10% (50/60Hz) |
Power consumption | Approx. 4W |
Case dimensions/weight | 128 (W)×190 (H)×238 (D) mm /2.9kg |
Maximum dimensions | 138 (W)×212 (H)×268 (D) mm |