VT-185

Electronic Voltmeters VT-185

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Outline

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.  The VT-183 is an energy-saving model featuring an up/down auto ranging attenuator as well as the basic performance of the above models.  The VT-182 is an ultrahigh-sensitivity model with10 μV full scale. (It is also referred to as a noise meter.) It incorporates audio compensation filters (JIS-A? DIN-NOISE? DIN-AUDIO? CCIR? CCIR/ARM) which? together with its capability for average value detection and peak value detection? makes it a powerful tool in measuring very low voltages such as noise levels.  The VT-185 (1mV full scale) and VT-186 (300 μV full scale) are 2-channel models with two attenuators? which can be used in either independent or interconnected operation? making for easy independent voltage measurements and voltage comparisons. The VT-187 has performance identical to the VT-186 except that its attenuators can be switched from a remote controller (optional). Each member of the VT Series lineup has specific features setting it apart from the other models? allowing you to select the exact voltmeter to match your needs.

Features

●Electronic Voltmeters VT-181/VT-181E The VT-181 and VT-181E are electronic voltmeters capable of measuring the rms values of AC voltages. The measuring ranges are from 1mV to 300V f.s. (VT-181) and 300μV to 100 V f.s. (VT-181E), the frequency response is from 5H to 1MHz, and the input impedance is 10MΩ at 45pF (VT-181) or 50pF (VT-181E). Each model is equipped with a monitor output with a gain of approx. 60dB so that it can be used as a broad-band preamplifier. ●Ultrahigh-Sensitivity Electronic Voltmeter VT-182 The VT-182 ultrahigh-sensitivity electronic voltmeter is capable of measuring noise voltages and S/N. With a measuring range between 10 μV and 300 V f.s., frequency response is between 10 Hz and 500 kHz and 5 audio compensation filters (JIS-A, DIN-NOISE, DIN-AUDIO, CCIR, CCIR/ARM) are built in, this model can also be used as a noise meter. ●Autoranging Electronic Voltmeter VT-183 The VT-183 is a high-sensitivity, broad-band electronic voltmeter featuring automated range switching. The up/down autoranging system allows switching of the measuring range to the easiest-to-read range in an instant. The measuring range is between 1 μV and 300 V f.s., the frequency response is between 10 Hz and 1 MHz and the input impedance is 10 MΩ at 45 pF. The set range is displayed by 12 LEDs in the upper part of the front panel. ●2-Channel Electronic Voltmeter VT-185 The VT-185 is a high-sensitivity, 2-channel electronic voltmeter using a 2-pointer meter. The measuring range is between 1μV and 300V f.s. (2 CHs), the frequency response is between 5Hz and 1 MHz and the input impedance is 10MΩ at 45 pF. It can be used as 2 sets of electronic voltmeters as well as a broad-band preamplifier. ●2-Channel Electronic Voltmeter VT-185 The VT-185 is a high-sensitivity, 2-channel electronic voltmeter using a 2-pointer meter. The measuring range is between 1μV and 300V f.s. (2 CHs), the frequency response is between 5Hz and 1 MHz and the input impedance is 10MΩ at 45 pF. It can be used as 2 sets of electronic voltmeters as well as a broad-band preamplifier. ●2-Channel High-Sensitivity Electronic Voltmeter VT-186 The VT-186 is a high-sensitivity, broad-band 2-channel electronic voltmeter with a 2-pointer meter. With the measurement range of 300μV to 100 V f.s. (2 CHs), frequency response of 5 Hz to 1 MHz and input impedance of 10MΩ at 45pF, it can be used as two high-sensitivity electronic voltmeter units as well as a broad-band preamplifier. ●2-Channel high-sensitivity electronic voltmeter VT-187 The VT-187 is a high-sensitivity, broad-band 2-channel electronic voltmeter with a 2-pointer meter. With the measurement range of 300 micro V to 100 V f.s. (2 CHs), frequency response of 5 Hz to 1 MHz and input impedance of 10MΩ at 45 pF, it can be used as two high-sensitivity electronic voltmeter units as well as a broad-band preamplifier. The greatest feature of this model is that it can be remote controlled from the optional RT-62A remote controller. ●SPECIFICATIONS SPECIFICATIONS MODEL VT-181 VT-181E VT-182 VT-183 VT-185 VT-186 VT-187 Voltmeter Voltage measurement ranges 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) Voltage: 0.3mV～100V, 12 ranges (0.3mV/1mV/3mV/10mV/30mV/ 100mV/0.3V/1V/3V/10V/30V/ 100V) full scale dB: -90dB to 40dB  (0dB＝1V) dBm: -90dBm to 42dBm　 　　(0dBm＝1mW, 600Ω) Voltage: 10μV to 300V, 16 ranges 　（10μV/30μV/100μV/300μV/1mV/ 3mV/10mV/30mV/100mV/300mV/ 1V/3V/10V/30V/100V/300V)  full scale dB: -120dB to 50dB (0dB＝1V) dBm: -120dBm to 52dBm (0dBm＝1mW, 600Ω) 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) Voltage: 0.3mV to 100V, 12 ranges 　（0.3mV/1mV/3mV/10mV/30mV/100mV/ 0.3V/1V/3V/10V/30V/ 100V）full scale dB: -90dB to 40dB (0dB＝1V) dBm: -90dBm to 42dBm (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% Mean-value detection and rms indication 10μV range: 20Hz to 10kHz ±5%  10Hz to 30kHz ±10%  30μV to 300μV ranges:  20Hz to 20kHz ±5%  10Hz to 100kHz ±10%  1mV to 300V ranges  20Hz to 100kHz ±3%  15Hz to 300kHz ±5%  10Hz to 500kHz ±10% 10Hz to 1MHz ±10%  20Hz to 200kHz ±3%  50Hz to 100kHz ±2% 5Hz to 1MHz ±10%  10Hz to 500kHz ±5%  20Hz to 200kHz ±3%  30Hz to 100kHz ±2% Input impedance 10MΩ ±5%, 45pF max. 10MΩ±5%, 50pF max. 1MΩ ±5%, 50pF max. 10MΩ ±5%, 45pF max. 10MΩ ±5%, 50pF 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 At 400Hz:  500V (DC ACpeak)  　　in 1V to 100V ranges  100V (DC ACpeak)  　　 in 0.3mV to 300mV ranges 10μV to 300μV ranges 10Vrms, 500V DC  1mV to 300mV ranges 80Vrms, 500V (DC ACpeak) 1V to 300V ranges  500V (DC ACpeak) At 400Hz:  500V (DC ACpeak), in 1V to 300V ranges  100V (DC ACpeak), in 1mV to 300mV ranges At 400Hz:  500V (DC ACpeak), in 1V to 100V ranges  100V (DC ACpeak), in 0.3mV to 300mV ranges Temperature coefficient ±0.08%/°C Temperature for guaranteed spec. 10°C to 40°C, 80% max. humidity 15°C to 35°C, 80% max. humidity 10°C to 40°C, 80% max. humidity Temperature for operation 0 to 50°C Crosstalk - 80dB min. (independent , one channel terminated with 600Ω)/50dB min. (linked, with one channel terminated with 600Ω) Indication value variable range 0 to Approx. -10dB 0 to Approx. -12dB 0 to Approx. -10dB Residual noise 20μV and lower (1mV and 1V ranges) with input shorted 30μV and below (0.3mV range) with input shorted Mean-value detection and rms indication 1.5μVrms and below (10μV range) 5μVrms and below (30μV range) with input shorted 20μV and below (1mV and 1V range),with input shorted 30μV and below (0.3mV and 1V range), with input shorted Auditory compensation filters - JIS-A, DIN NOISE, DIN AUDIO, CCIR and CCIR/ARM weighted characteristics - Amplifier (AC) Gain Approx. 60dB Approx. 70dB Approx. 100dB Approx. 60dB Approx. 70dB Output voltage 1Vrms±20% of FS (open circuit) 1Vrms±10% of FS (open circuit) 1Vrms±20% of FS (open circuit) Output resistance 600Ω ±20% 600Ω ±10% 600Ω ±20% Distortion 1% max. at full scale (1kHz) (specified in terms of S/N ratio for 1mV and 1V ranges) 1% max. at full scale (1kHz) (specified in terms of S/N ratio for 0.3mV,1mV and 1V ranges) 1% max. at full scale (1kHz) (specified in terms of S/N ratio for 10μV to 300μV ranges) 1% max. at full scale (1kHz) (specified in terms of S/N ratio for  1mV and 1V ranges) 1% max. at full scale (1kHz) (specified in terms of S/N ratio for 0.3mV, 1mV and 1V ranges) S/N 40dB min. at full scale 40dB min. at full scale (0.3mV range: 30dB min.) At full scale:  1mV to 300V range 40dB min.  300μV range 30dB min.  100μV range 30dB min. 30μV range 20dB min. 10μV range 16.5dB min. 40dB min. at full scale 40dB min. at full scale (0.3mV range: 30dB min.) Frequency response 5Hz to 500kHz (±3dB) 1mV to 300V ranges: 10Hz to 500kHz (±3dB) 30μV to 300μV ranges: 10Hz to 150kHz (±3dB) 10μV range 10Hz to 30kHz (±3dB) 10Hz to 500kHz (±3dB) Amplifier (DC) Output voltage - 1V±10% at full scale (open circuit) 1V±20% offset at full scale (open circuit) - Output impedance - 600Ω ±10% 600Ω ±20% - General line voltage 100V, 120V, 220V, 240V (VT-181E: 230V ) AC, ±10% (50/ 60 Hz) Power consumption Approx. 4W 6.9W Approx. 18.7W Approx. 5W Approx. 7W 11W max. Case dimensions/weight 128 (W)×190 (H)×238 (D) mm /2.9kg 128 (W)×190 (H)×239 (D) mm /2.8kg 128 (W)×190 (H)×285 (D) mm /4.4kg 128 (W)×190 (H)×238 (D) mm /3.2kg 128 (W)×190 (H)×238 (D) mm /3kg 128 (W)×190 (H)×239 (D) mm /3kg 128 (W)×190 (H)×238 (D) mm /3kg Maximum dimensions 138 (W)×212 (H)×268 (D) mm 130 (W)×210 (H)×259 (D) mm 138 (W)×214 (H)×315 (D) mm 138 (W)×212 (H)×268 (D) mm Accessories Instruction manual (1), Power cord (1), Accessory cable (CA-41) (1) Instruction manual (1), Power cord (1), Accessory cable (CA-41) (2)