Overview Features Performance Options

Digital Multimeters VOAC7523H/7522H/7520H/7521H Performance

* Accuracy: ±(X% of reading + Y digits) is written as X + Y. Accuracy for all is 1 year after calibration.

1. Typical sample rate and resolution

Sample rate Resolution Measurement count Hum rejection
SLOW 5.5-digit Approx. 4 times/second ○
MID 5.5-digit Approx. 20 times/second ○
FAST 4.5-digit Approx. 100 times/second
×

2. DC voltage measurement (DCV)

The 50mV range is VOAC 7523H/7522H only.

Range Resolution Input resistance Accuracy *
5.5-digit 4.5-digit SLOW/MID FAST
50mV 0.1μV 1μV 100MΩ or more 0.025+10 0.025+15
500mV 1μV 10μV 1000MΩ or more 0.012+5 0.012+10
5V 10μV 100μV 0.012+2 0.012+7
50V 100μV 1mV Approx. 10MΩ 0.016+5 0.016+10
500V 1mV 10mV 0.016+2 0.016+7
1000V 10mV 100mV

The accuracy of the 50mV and 500mV ranges after zero correction by the REL operation
Sample rate of 50mV range is SLOW/MID: approx. 0.5 times/second, FAST: approx. 50 times/second
Maximum allowable voltage: 50mV to 5V ranges ±800V continuous
　　　　　　: 50V to 1000V range ±1100V continuous

Resolution and noise rejection

Resolution Sample rate NMRR CMRR
5.5-digit SLOW 55dB or more 120dB or more
5.5-digit MID 55dB or more 120dB or more
4.5-digit FAST 0dB 55dB or more

3. CH-B DC voltage measurement (DCV)

VOAC7523H/7520H only

Range Resolution Input resistance Accuracy *
4.5-digit SLOW/MID FAST
5V 100μV CH-B:H~CH-B:L　10MΩ±3%
CH-B:H~CH-A:L　 5MΩ±3%
CH-B:L~CH-A:L　　5MΩ±3%		 0.025+2 0.025+30
50V 1mV 0.025+8
300V 10mV 0.025+5

Maximum allowable voltage: ±300V, ±300V between CH-A L and CH-B

Resolution and noise rejection

Resolution Sample rate NMRR CMRR Influence of voltage between CH-A and L
4.5-digit SLOW/MID 55dB or more 120dB or more 56dB or more
4.5-digit FAST 0dB 55dB or more

4. AC voltage measurement (ACV, DC + ACV) True RMS value detection

* VOAC 7521H/7520H up to 100kHz

Range Resolution Measurement range Input resistance
5.5-digit SLOW MID/FAST
500mV 1μV 15Hz~300kHz * 200Hz~300kHz * Approx. 1MΩ//
100pF or less
5V 10μV
50V 100μV
500V 1mV 45Hz~100kHz 200Hz~100kHz
750V 1mV 45Hz~20kHz 200Hz~20kHz

Accuracy: SLOW/MID/FAST sample

Frequency Accuracy *
15Hz~45Hz 0.5+150
45Hz~100Hz 0.25+150
100Hz~30kHz 0.2+150
30kHz~100kHz 0.5+300
100kHz~300kHz 2.5+1000

For sine waves in the range of 5% to 100%

Coefficient for inputs other than sine waves

Frequency Crest factor
1~1.5 1.5~2 2~3
15Hz~30kHz 0.05% 0.15% 0.30%
30kHz~300kHz 0.20% - -

Response time

Sample rate Resolution Measurement count Response time
SLOW 5.5-digit 4 times/second 3 seconds or less
MID/FAST 5.5-digit 20 times/second 2 seconds or less

Maximum allowable voltage: 780Vrms, ±1100VDC (continuous)
For DC + ACV, add 500 (45Hz or less) or 300 (45Hz or more) to the accuracy digits.
The sample rate FAST is the same as MID approx. 20 times/second.

5. DC current measurement (DCA)

Range Resolution Accuracy * Input resistance
5.5-digit 4.5-digit SLOW/MID FAST
5mA 10nA 100nA 0.05+7 0.05+17 150Ω or less
50mA 100nA 1μA 15Ω or less
500mA 1μA 10μA 2Ω or less
10A 100μA 1mA 0.2+7 0.2+17 0.1Ω or less

The input terminals of the 5mA to 500mA range and the 10A range are different, so the automatic range between them is not performed.
Maximum allowable current: 5mA to 500mA range500mA (FUSE 0.5A/250V)
　　　　　　: 10A range10A (FUSE 15A/250V)

6. AC current measurement(ACA, DC+ACA)

Range Resolution Measurement range Input resistance
5.5-digit SLOW/MID FAST
5mA 10nA 15Hz~5kHz 200Hz~5kHz 150Ω or less
50mA 100nA 15Ω or less
500mA 1μA 45Hz~5kHz 2Ω or less
10A 100μA 0.1Ω or less

Accuracy: SLOW sample

Frequency Accuracy * Crest factor
1~1.5 1.5~2 2~3
15Hz~45Hz 1+200 0.05% 0.15% 0.30%
45Hz~1kHz 0.4+200
1kHz~5kHz 5.0+200

5% of the range (10% of the 10A range) to 100% for sine waves

Response time

Sample rate Resolution Measurement count Response time
SLOW 5.5-digit 4 times/second 3 seconds or less
MID/FAST 5.5-digit 20 times/second 2 seconds or less

Maximum allowable current: 5mA to 500mA range500mA (FUSE 0.5A)
　　　　　　: 10A range10A (FUSE 15A)
Less than or equal to the maximum allowable current including the DC component that is superimposed on the input current.
For 45Hz to 1kHz in the 10A range, add 0.3 to the % item.
For DC + ACA, add 500 (45Hz or less) or 300 (45Hz or more) to the accuracy digits.
The sample rate FAST is the same as MID approx. 20 times/second.

7. Resistance measurement(2WireΩ/4WireΩ)

4WireΩ is VOAC 7522H/7521H only

Range Resolution Accuracy * Measured current
SLOW/MID FAST SLOW/MID FAST
50Ω 0.1mΩ 1mΩ 0.025+10 0.025+15 Approx. 10mA
500Ω 1mΩ 10mΩ 0.014+3 0.014+8 Approx. 10mA
5kΩ 10mΩ 0.1Ω Approx. 1mA
50kΩ 0.1Ω 1Ω Approx. 100μA
500kΩ 1Ω 10Ω 0.015+3 0.015+33 Approx. 10μA
5MΩ 10Ω 10Ω 0.033+30 0.033+30 Approx. 1μA
50MΩ 100Ω 100Ω 0.25+30 0.25+30 Approx. 100nA
500MΩ 1kΩ 1kΩ 1.5+50 1.5+50 Approx. 10nA

Maximum allowable voltage: ± 500Vpeak
Terminal open voltage: 12V or less
The range of 50Ω to 5kΩ is the accuracy after zero correction by the REL operation.
FAST in the 5MΩ to 500MΩ range is the same as MID, approx. 20 times/second.

8. Lo-Power resistance measurement (2WireΩ)

Range Resolution Accuracy * Measured current
SLOW/MID/FAST SLOW/MID FAST
500Ω 10mΩ 0.1+5 0.1+15 Approx. 1mA
5kΩ 0.1Ω Approx. 100μA
50kΩ 1Ω Approx. 10μA
500kΩ 10Ω 0.2+30 0.2+40 Approx. 1μA
5MΩ 100Ω 0.2+30 Approx. 100nA
50MΩ 1kΩ 1.5+30 1.5+30 Approx. 10nA

Maximum allowable voltage: ± 500Vpeak
Terminal open voltage: 12V or less
The range of 500Ω to 5kΩ is the accuracy after zero correction by the REL operation.
FAST in the 5MΩ to 50MΩ range is the same as MID, approx. 20 times/second.
SLOW/MID/FAST are all 4.5 digits.

9. Diode measurement

Measured current Measurement range Accuracy * Terminal open voltage Maximum allowable voltage
Approx. 1mA or 10mA 0.1mV~5.0999V 0.014+13 12V or less ±500Vpeak



10. Temperature measurement

Thermocouple Measured temperature range Accuracy * Resolution Maximum allowable voltage
R -50~0℃ 0.2+70 0.1℃ ±500Vpeak
0~+100℃ 0.2+50
+100~+1768℃ 0.2+30
K(CA) -200~-100℃ 0.15+50
-100~0℃ 0.15+35
0~+1372℃ 0.15+20
T(CC) -200~-100℃ 0.15+50
-100~0℃ 0.15+35
0~+400℃ 0.15+20
J(IC) -200~-100℃ 0.15+50
-100~0℃ 0.15+35
0~+1200℃ 0.15+20
E(CRC) -200~-100℃ 0.15+50
-100~0℃ 0.15+35
0~+1000℃ 0.15+20

The above accuracy does not include the accuracy of the thermocouple.
The operating environment temperature of the device is ±0.1°C/°C at 0°C to 18°C and 28°C to 50°C (total thermocouple).
The measured temperature -200°C or less may be displayed, but the accuracy is not guaranteed.
The reference thermoelectric power is calculated according to the broken line approximation according to JIS C 1602-1995.
When the device and the thermocouple are connected through a plug, the error of the contact temperature compensation is added.
After the thermocouple is connected, heat run for at least 1 hour. (Do not expose the device to the wind)

11. Frequency measurement

Sample rate Measurement count (gate time) Number of digits to display and measurement range Accuracy *
SLOW Approx. 0.5 times/second (1s)
 6-digit 15.0000Hz~1.00000MHz 0.02+2
MID Approx. 4 times/second (100ms) 5-digit 15.000Hz~1.0000MHz
FAST Approx. 10 times/second (10ms) 4-digit 150.00Hz~1.000MHz

AC coupling, Crest factor: 3 or less
Input attenuator uses ACV AUTO range.
Maximum allowable voltage:780Vrms, ±1100Vpeak

12. Combination of dual functions

*1 In the table, the number on the right shoulder of the△ mark indicates the corresponding “Constraint” number.
*2 CH-B DCV is only installed on VOAC7520H/7523H.
*3 4WΩ is only installed on VOAC7521H/7522H.


* Dual-function operation has the following limitations compared to single-function operation.

  • You cannot select a sampling rate.
  • The sampling rate will be delayed. (For example, in the case of a dual function with a combination of DCV and DCA, the limit is about 1 time/second. Please contact us for more details.)
  • The display does not show the results of comparator operations, the type of statistical data, or attribute information such as functions, ranges, and timestamps.
  • The main unit of measurement is not displayed. The units of measurement of the sub-side are displayed with the LED of “SUB DISP UNITS.”

13. General performance

Operations Moving average, scaling operations, decibel operations (dBm, dBμ), differential operations, statistical operations (MAX, MIN, x, σ), comparison operations, dual function arithmetic operations, continuity tests
Memory DATA 3000pcs data with 10msec resolution timestamp (elapsed time)
SET UP 10 pieces
Interface
(Full remote) 		Standard RS-232
Option LAN, GP-IB
Power supply Voltage 100VAC (standard)
110V, 220V, 240V (option)
Frequency 50Hz, 60Hz
Power consumption 21VA or less (including option)
Operating temperature and humidity 0°C to 50°C (80% RH or less)
However, there shall be no condensation and the between 40°C and 50°C, humidity shall be 70% RH or less.
Storage temperature and humidity -20°C to 60°C (70% RH or less)
However, there shall be no condensation. It also includes the operating temperature range.
Size Shape 210Wx99Hx353L mm (Optionally built into the main unit)
Weight 3.5kg or less (including option)
Accessories Current measurement spare fuse, test leads (1 set), adjustment screwdriver, simple manual, instruction manual (CD-ROM), AC power cable