Overview Specification Options

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

* 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)

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 50mV range is VOAC 7523H/7522H only
50mV and 500mV ranges are accurate after zero correction by REL calculation
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)　　Equipped only with VOAC7523H/7520H

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

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

* VOAC 7521H/7520H up to 100kHz


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 from 5% to 100% of the range


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 range：500mA (FUSE 0.5A/250V)
　　　　　　　　　　　　　・10A range：10A (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% to 100% of range for 5mA/50mA/500mA ranges, 10% to 100% of range for 10A range


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 range：500mA (FUSE 0.5A)
　　　　　　　　　　　　　・10A range：10A (FUSE 15A)
Observe the maximum allowable current, including the DC component superimposed on the input current.
For the 10A range, 45 Hz to 1 kHz, add 0.3 to the % term.
For DC+ACA, add 500 (below 45Hz) and 300 (above 45Hz) to the digits of accuracy term.
The sample rate FAST is the same as MID approx. 20 times/second.


7. Resistance measurement(2WireΩ/4WireΩ)

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

4WireΩ is VOAC 7522H/7521H only
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.
Add ±0.1°C/°C for all thermocouples at the operating ambient temperature of 0°C to +18°C and +28°C to +50°C.
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 connecting the thermocouple, heat run the unit for at least 1 hour. Do not expose the unit to 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 AC100V (standard)
Can be changed to 110V, 220V, or 240V　*Additional modification costs are required.
Frequency 50Hz, 60Hz
Power consumption 21VA or less (including option)
Operating temperature and humidity 0°C to +50°C (80% rh or less)
Less than 70%RH at +40°C to +50°C
no condensation
Storage temperature and humidity -20°C to 0°C, +40°C to +60°C (70%RH or less)
0°C to +40°C (80% rh or less)
no condensation
Size Shape 210Wx99Hx353L mm (Optionally built into the main unit)
Weight 3.5kg or less (including option)
Accessories Current measurement spare fuse (2 each of 2 kinds), Test leads (1 set), Adjustment screwdriver (1), Simple manual (1), Instruction manual (CD-ROM) (1), AC power cable(1)