Overview Function Introduction Performance Options

Digital Multimeter VOAC7502 Performance

For the following description of performance, the following conditions and definitions apply.
Residual heat time: 1 hour Temperature/Humidity 23°C ±5 °C 80% RH or less, 1 year accuracy, Response time: Time to accuracy within each range

1. Sampling rate and resolution

1-1. DC system (DCV, DCI, 2WΩ, 4WΩ)

Sampling Rate (S/s) *1 Display digits Notes
Power supply frequency:50Hz Power supply frequency:60Hz
2.5(1)~ 50(20) 2.5(1)~ 60(20) 5 ½ digits AUTOZERO ON or 4WΩ is indicated in parentheses
100 ~ 30k 100 ~ 30k 4 ½ digits Cannot be selected with 4WΩ

*1. The sampling rate is guaranteed only when the MODE of the logging function is capture in BULK mode.

1-2. AC system (ACV, ACI)

AC filter Sampling rate Display digits Response time *1
Power supply frequency:50Hz Power supply frequency:60Hz
MID 2.5S/s 2.5S/s 5 ½ digits Within 3 seconds
HIGH 2.5 ~ 50S/s 2.5 ~ 60S/s Within 2 seconds

*1. Time to accurately enter for each range

2. DC voltage measurement (DCV)

2-1. Accuracy and resolution

Units: ± (% of reading + % of range)

Range Full-scale at 5 ½ digits Resolution Accuracy Temperature coefficient/°C Input impedance
100mV 119.999 1μV 0.018 + 0.003 0.0015 + 0.0004 1GΩ or more
Or
10MΩ±1%
1V 1.19999 10μV 0.015 + 0.003 0.0015 + 0.0001
10V 11.9999 100μV 0.012 + 0.001 0.0015 + 0.0001
100V 119.999 1mV 0.015 + 0.003 0.0020 + 0.0001 10MΩ±1%
1000V 1100.00 10mV 0.015 + 0.003 0.0020 + 0.0001
  • Sampling rate : 1S/s
  • Maximum allowable voltage: 100mV to 100V range: 800Vpeak (continuous), 1100Vpeak (1 minute), 1000V range: ±1100Vpeak (continuous)
  • Response time: Within 1 second

2-2. Noise rejection

(50Hz/60Hz±0.1%)

PLC NMRR CMRR unbalance resistance 1kΩ
1 PLC integer multiple 55dB 120dB
Other than the above 0dB －

3. AC voltage measurement (ACV)

3-1. Resolution and measurement range

True RMS crest factor:<3

Range Full scale Resolution Measurement range Input impedance
MD HIGH
100mV 119.999 1μV 20Hz~100kHz 200Hz~100kHz Approx. 1MΩ//
100pF or less
1V 1.19999 10μV
10V 11.9999 100μV
100V 119.999 1mV
750V 750.00 10mV 20Hz~100kHz 20Hz~100kHz

3-2. Accuracy

Units : ± (% of reading + % of range)

Range Frequency Accuracy Temperature coefficient
100.0000mV~750.000V 20Hz~45Hz 0.70 + 0.04 0.070 + 0.004
45Hz~100Hz 0.20 + 0.04 0.020 + 0.004
100Hz~20kHz 0.10 + 0.04 0.010 + 0.004
20kHz~50kHz 0.20 + 0.05 0.020 + 0.005
50kHz~100kHz 0.60 + 0.08 0.060 + 0.008
  • Accuracy for sine waves
  • Maximum allowable voltage 750Vrms or 1100Vpeak, DC component is ±500V or less
  • The 750V range is limited to 100kHz or 8 x 107V・Hz.
  • The crest factor is guaranteed for full-scale inputs up to 3 or the maximum input voltage, whichever is smaller.

4. DC current measurement (DCI)

4-1. Accuracy and resolution

Units : ± (% of reading + % of range)

Range Full-scale at 5 ½ digits Resolution Accuracy Temperature coefficient/°C Shunt resistance
1mA 1.19999 10nA 0.050 + 0.002 0.003 + 0.0005 90Ω
10mA 11.9999 100nA 0.050 + 0.002 0.003 + 0.0005 5Ω
100mA 119.999 1μA 0.050 + 0.002 0.005 + 0.0005 5Ω
1A 1.19999 10μA 0.050 + 0.002 0.003 + 0.0005 0.1Ω
3A 3.0000 100μA 0.150 + 0.002 0.005 + 0.0005 0.1Ω
  • Resolution applies to 5 ½ digit state.
  • Maximum allowable current full range: 3 ADC or 3 Arms (continuous, protected by 3A fuse)

5. AC current measurement (ACI)

5-1. Resolution and measurement range

True RMS crest factor:<3

Range Full scale Resolution Measurement range Shunt resistance
MD HIGH
1A 1.19999 10μA 20Hz~5kHz 200Hz~5kHz 0.1Ω
3A 3.0000 100μA

5-2. Accuracy

Units : ± (% of reading + % of range)

Range Frequency Accuracy Temperature coefficient
1A / 3A 20Hz~45Hz 0.70 + 0.1 0.100 + 0.01
45Hz~100Hz 0.35 + 0.1 0.035 + 0.01
100Hz~5kHz 0.50 + 0.1 0.050 + 0.01
  • Accuracy for sine waves
  • Maximum allowable current: 3Arms continuous (protected by 3A fuse)

6. 2 Terminal resistance measurement (2WΩ)/4 terminal resistance measurement (4WΩ)

6-1. Resolution, accuracy, and measurement current

Units: ± (% of reading + % of range)

Range Full scale Resolution Accuracy Temperature coefficient Measured current
100Ω 119.999 1mΩ 0.020 + 0.003 0.002 + 0.0004 Approx. 1mA
1kΩ 1.19999 10mΩ 0.018 + 0.003 0.002 + 0.0001 Approx. 1mA
10kΩ 11.9999 0.1Ω 0.018 + 0.003 0.002 + 0.0001 Approx. 100μA
100kΩ 119.999 1Ω 0.018 + 0.003 0.0002 + 0.0001 Approx. 10μA
1MΩ 1.19999 10Ω 0.018 + 0.003 0.0002 + 0.0002 Approx. 5μA
10MΩ 11.9999 100Ω 0.250 + 0.005 0.250 + 0.0005 Approx. 500nA
100MΩ 119.999 1kΩ 1.500 + 0.005 0.150 + 0.0010 Approx. 500nA//10MΩ
  • With a resolution of 5 ½ digits, it is the accuracy of the 4-terminal resistance measurement or the 2-terminal resistance measurement after zero correction by NULL operation.
    If the NULL operation is not used, an additional error of 0.2Ω is added to the 2-terminal resistance measurement.
  • Maximum allowable voltage: Between the Ω-COM terminals: 800Vpeak (continuous), 1100Vpeak (1 minute), between Sense Hi-Lo: 200Vpeak
  • Terminal open voltage<17 V

7. Continuity test(CONT)

7-1. Accuracy, resolution, and measurement current

Units : ± (% of reading + % of range)

Resistance range Resolution Threshold Accuracy Temperature coefficient Measured current Sampling rate
1kΩ 10mΩ 1Ω~1000Ω 0.020 + 0.020 0.002 + 0.002 Approx. 1mA 100 S/s



  • Electronic buzzer sound
  • Maximum allowable voltage: 800Vpeak (continuous), 1100Vpeak (1 minute)

8. Diode

8-1. Accuracy and measurement range

Units: ± (% of reading + % of range)

Measured current Measurement range Accuracy Temperature coefficient Terminal open voltage Sampling rate
Approx. 1mA 0.1mV~1.1999V 0.020 + 0.020 0.002 + 0.002 <17V 100 S/s



  • Maximum allowable voltage: 800Vpeak (continuous), 1100Vpeak (1 minute)

9. Frequency measurement (FREQ)

9-1 Accuracy and number of display digits, measurement range

AC coupling, reciprocal method, crest factor < 3

Gate time Number of digits to display and measurement range Accuracy (%)
3Hz~5Hz 5Hz~10Hz 10Hz~40Hz 40Hz~300kHz
100ms 6-digit:3.00000Hz~300.000kHz 0.1 0.05 0.03 0.01
10ms 5-digit:3.0000Hz~300.00kHz
1ms 4-digit:3.000Hz~300.0kHz
  • Maximum allowable voltage: 750Vrms, or 1100Vpeak (continuous), but DC component is ±500V or less.
  • The input attenuator switches the ACV range of 100mV to 750V automatically or manually.
  • Input range: 3Hz-100kHz: 100mVrms to 750Vrms (However, 100kHz to 300kHz is up to 2.2x10 7 [V · Hz])
  • Inputs above 200Vrms are guaranteed up to 100kHz.
  • Values may be measured and displayed for inputs less than 3Hz or more than 300kHz, but accuracy is not guaranteed.

10. Trigger function

Trigger mode AUTO, SINGLE
Number of trigger samples 1~100,000
Trigger delay 0.00ms to 3,600s (resolution 10 µs)
Trigger interval 0.00ms to 3,600s (resolution 10 µs)

11. Operation function

Type Moving average, NULL operation, scaling operation, decibel operation, statistical operation, limit operation



12. Logging function

Mode NORMAL mode The mode sampling rate is not guaranteed to be stored in memory while the measured data is monitored in real time.
BULK mode Mode in which measurement data cannot be monitored in real time, but the sampling rate is guaranteed
Measurement can be stopped by a STOP EVENT and the number of post-triggers can be set
Data size NORMAL mode 100k Readings fixed
BULK mode 1k, 2k, 5k, 10k, 20k, 50k, 100k Readings
STOP EVENT (BULK mode only) EXT TRIG, LEVEL, LIMIT judgment is set to EVENT, and measurement can be stopped
Number of post triggers (BULK mode only) The number of data acquired after the STOP EVENT can be set from 0 to 100% of the data size (setting resolution of 1%)

13. Primary display

Numerical display Font: 7-segment, Gothic typeface
Size: NORMAL, LARGE can be selected
ACV and frequency, NULL and measured values, etc. can be displayed simultaneously (only at NORMAL size)
Trend chart view Vertical axis: AUTO, FULLSCALE and MANUAL can be selected
Offline browse mode: Enlarged waveform scrolling, cursor & search measurement is possible
Histogram chart display Number of bins: 2 to 400, statistical cursor, H cursor measurement is possible
Offline browsing mode: Changing the display conditions, such as the number of bins, and re-displaying is possible
Arc scale meter display Scale: AUTO, FULLSCALE and MANUAL, LOG can be selected
LIMIT display The LIMIT judgment result is displayed as GO, HIGH, or LOW in large font.

14. Secondary display

Type Numerical display, analog meter display, statistical display, LIMIT judgment display can be selected. In the trend chart display and histogram chart display, information display of each chart and cursor measurement display are also possible.



15. General specifications

Interface USB2.0 (standard), GPIB (option), LAN & RS-232 (option), DIO interface (option) * USB interface is for remote use only. USB memory devices cannot be used.
REMOTE commands SCPI-compliant or IWATSU VOAC752x Series-compatible
(The old SC-303A compatible commands are not supported.)
Rear I/O terminal TRIG input, COMPLETE output
Setup memory Internal 10
LCD 4.3 inch color LCD, 480 × 272 dots, TFT active matrix, LED backlight
Preheating time 1 hour after power is turned on
Operation guaranteed temperature and humidity 0°C to 50°C (80% or equivalent moisture content at 40°C or below, no condensation)
Storage temperature and humidity -20°C to +60°C (90% or equivalent moisture content at 40°C or below, no condensation)
Power supply AC100V/110V/220V/240V±10 % , 50Hz/60Hz
Optional except 100VAC (factory option)
Power consumption 14VA or less (including option)
Withstand voltage DC ±500V (between common input terminal and earth ground)
Installation (overvoltage) category Category II (Local level, electrical and portable products)
Contamination level Contamination level 2* Do not use in an environment where there are conductive pollutants.
External dimensions Approx. 225Wx100Hx366D mm (excluding protrusions such as feet, handles, and knobs)
Mass Approx. 3.0kg (including protector and option)