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Contact
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Digital Multimeters VOAC7520H
Single VOAC7523H/7520H unit, equipped with a
2-channel DC measuring input and dual display, can perform DC voltage
measuring that normally requires two units and thus saves installation
space and improves measurement speed.
The VOAC7522H/7521H, equipped
with one input channel and dual display, can perform current or frequency
measuring simultaneously with voltage measuring.
The VOAC7523H/7522H
realizes the high resolution of direct-current voltage measuring at 0.1£gV
and broad bandwidth of alternating voltage at up to
300kHz.
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Full scale, 509999 |
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The highest full-scale count value among 5.5-digit models. (Researched by Iwatsu Test Instruments Corporation in November 2004) |
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Isolated 2CH input, dual display (VOAC7523H/7520H only) |
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Two DC measuring inputs are available.
The two channels are isolated from each other. Voltage comparison between two different circuits or potential difference measuring between parts within the same circuit can be easily performed. A single VOAC7523H/7520H unit can perform DC voltage measuring that normally requires two units, and thus saves installation space and improves measuring speed.
The VOAC7523H/7520H also has dual display functions to display measured values for other functions.
For example, a change of input cable connections or function switching is required to perform the measuring of different functions with existing single-display multimeters. A single VOAC7523H/7520H unit can perform these two types of measurements simultaneously. |
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Dual display |
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Conventionally, cable disconnection and function switching were required to perform different types of measuring. A VOAC752xH Series single unit can perform measuring that requires multiple units to improve measurment efficiency.
For example, when measuring power consumption (apparent power, VA), simultaneous measuring and operations of voltage and current enable real-time power measuring. |
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Versatile interface |
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A RS-232 interface is equipped as standard. In addition, LAN (Ethernet 10BASE-T) or GP-IB interfaces can be selected as options. |
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Long-time interval measurements of 3000 hours |
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Using interval measurement of 10 ms to 3600 s in combination with data saving functions with up to 3000 time stamps, measurements of maximum 3000 hours can be performed. The time stamp resolution is 10 ms. |
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True RMS measuring |
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All series models can measure true RMS AC voltage and AC current. |
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Versatile mathematical functions |
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Decibel operations (dBm, dB£g), scale operations (SCLE), moving averages (AVG), difference operations (REL), statistical operations (MAX, MIN,  , s), comparison operations (COMP), and arithmetic calculations between dual functions. |
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DIO (Digital Input/Output) output useful for production lines (option) |
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Using trigger and open collector outputs in combination with 5-step pass/fail judgment levels, application to production lines is facilitated. |
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Accuracy (¡ÓX% of reading +Y digits) indicated by X+Y |
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The measuring accuracy indicated below can be obtained for a year following the calibration of the instrument. |
| 1. Typical Sample Rate and Resolution |
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| Sample Rate |
Resolution |
Reading Rate |
Hum Rejection |
| SLOW |
5.5-digit |
approx. 4 times/sec |
Yes |
| MID |
5.5-digit |
approx. 20 times/sec |
Yes |
| FAST |
4.5-digit |
approx. 100 times/sec |
N/A |
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| 2. DC Volt (DCV) 50mV range is for the VOAC7523H / 7522H only. |
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| Range |
Resolution |
Input Resistance |
Accuracy* |
| 5.5-digit |
4.5-digit |
SLOW/MID |
FAST |
| 50mV |
0.1£gV |
1£gV |
100MW or more |
0.025+10 |
0.025+15 |
| 500mV |
1£gV |
10£gV |
1000MW or more |
0.012+5 |
0.012+10 |
| 5V |
10£gV |
100£gV |
0.012+2 |
0.012+7 |
| 50V |
100£gV |
1mV |
approx. 10MW |
0.016+5 |
0.016+10 |
| 500V |
1mV |
10mV |
0.016+2 |
0.016+7 |
| 1000V |
10mV |
100mV |
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| The accuracy in the 50mV and 500mV ranges is specified after zero compensation through the REL operation. |
Sample rate in the 50mV range
SLOW/MID: Approx. 0.5 times/sec, FAST: Approx. 50 times/sec |
| Max. input voltage: |
50mV to 5V range ¡Ó 800V (continuous)
50V to 1000V range ¡Ó 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 |
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| 3. CH-B DC Volt (DCV) VOAC7523H / 7520H only |
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| Range |
Resolution |
Input Resistance |
Accuracy* |
| 4.5-digit |
SLOW/MID |
FAST |
| 5V |
100£gV |
CH-B:H to CH-B:L 10MW ¡Ó 3%
CH-B:H to CH-A:L 5MW ¡Ó 3%
CH-B:L to CH-A:L 5MW ¡Ó 3% |
0.025+2 |
0.025+30 |
| 50V |
1mV |
0.025+8 |
| 300V |
10mV |
0.025+5 |
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| Max. input voltage: |
¡Ó 300V, between CH-A L and CH-B ¡Ó 300V |
| Resolution and noise rejection |
| Resolution |
Sample Rate |
NMRR |
CMRR |
Isolation between CH-A and CH-B |
| 4.5-digit |
SLOW/MID |
55dB or more |
120dB or more |
56dB or more |
| 4.5-digit |
FAST |
0dB |
55dB or more |
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4. AC Volt (ACV, DC+ACV) detection of True RMS
Up to 100kHz for VOAC7521H / 7520H |
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| Range |
Resolution |
Measurement Range |
Input Resistance |
| 5.5-digit |
SLOW |
MID/FAST |
| 500mV |
1£gV |
15Hz to 300kHz |
200Hz to 300kHz |
less than approx.
1MW // 100pF |
| 5V |
10£gV |
| 50V |
100£gV |
| 500V |
1mV |
45Hz to 100kHz |
200Hz to 100kHz |
| 750V |
10mV |
45Hz to 20kHz |
200Hz to 20kHz |
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| Accuracy: SLOW Sample (Sine wave Amplitude at 5% to 100% of fullscale of range) |
| Frequency |
Accuracy* |
| 15Hz to 45Hz |
0.5+150 |
| 45Hz to 100Hz |
0.25+150 |
| 100Hz to 30kHz |
0.2+150 |
| 30kHz to 100kHz |
0.5+300 |
| 100kHz to 300kHz |
2.5+1000 |
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| Coefficient to input other than sine wave |
| Crest Factor |
Crest Factor |
| 1 to 1.5 |
1.5 to 2 |
2 to 3 |
| 15Hz to 30kHz |
0.05% |
0.15% |
0.30% |
| 30kHz to 300kHz |
0.20% |
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| Sample Rate |
Resolution |
Reading Rate |
Response Time |
| SLOW |
5.5-digit |
4 times/sec |
less than 3 sec |
| MID/FAST |
5.5-digit |
20 times/sec |
less than 2 sec |
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| Max. input voltage: 780Vrms, ¡Ó 1100V DC (continuous) |
| In the case of DC+ACV, 500 (less than 45Hz) or 300 (45Hz or higher) must be added to the value of Accuracy digit in above. |
| Sample rate of FAST becomes the same values as MID (approx. 20 times/sec). |
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| 5. DC Current (DCA) |
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| Range |
Resolution |
Accuracy* |
Input Resistance |
| 5.5-digit |
4.5-digit |
SLOW/MID |
FAST |
| 5mA |
10nA |
100nA |
0.05+7 |
0.05+17 |
150W or less |
| 50mA |
100nA |
1£gA |
15W or less |
| 500mA |
1£gA |
10£gA |
2W or less |
| 10A |
100£gA |
1mA |
0.2+7 |
0.2+17 |
0.1W or less |
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| Auto range is not available between 5mA to 500mA range and 10A range because of using different input terminals. |
| Max. input current: |
500mA at 5mA to 500mA ranges (FUSE 0.5A/250V)
10A at 10A range (FUSE 15A/250V) |
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| 6. AC Current (ACA, DC+ACA) |
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| Range |
Resolution |
Measurement Range |
Input Resistance |
| 5.5-digit |
SLOW/MID |
FAST |
| 5mA |
10nA |
15Hz to 5kHz |
200Hz to 5kHz |
150W or less |
| 50mA |
100nA |
15W or less |
| 500mA |
1£gA |
45Hz to 5kHz |
2W or less |
| 10A |
100£gA |
0.1W or less |
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| Accuracy: SLOW Sample (Sine wave) amplitude at 5% to 100% of fullscale (10% to 100% for10A range) |
| Frequency |
Accuracy* |
Crest Factor |
| 1 to 1.5 |
1.5 to 2 |
2 to 3 |
| 15Hz to 45Hz |
1+200 |
0.05% |
0.15% |
0.30% |
| 45Hz to 1kHz |
0.4+200 |
| 1kHz to 5kHz |
5.0+200 |
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| Sample Rate |
Resolution |
Reading Range |
Response time |
| SLOW |
5.5-digit |
4 times/sec |
less than 3 sec |
| MID/FAST |
5.5-digit |
20 times/sec |
less than 2 sec |
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| Max. input current: |
500mA for 5mA to 500mA ranges (FUSE 0.5A)
10A for 10A range (FUSE 15A) |
| DC Component on input current must be included in the Max. input current. |
| In the case of 10A range at 45Hz to 1kHz, 0.3 must be added to %. |
| In the case of DC+ACA, 500 (less than 45Hz) or 300 (45Hz or higher) must be added to the value of Accuracy in above. |
| Sample rate of FAST becomes the same value as MID (approx. 20 times/sec). |
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| 7. Resistance (2 WireW/4 WireW) 4 WireW: VOAC7522H / 7521H only |
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| Range |
Resolution |
Accuracy* |
Test Current |
| SLOW/MID |
FAST |
SLOW/MID |
FAST |
| 50W |
0.1mW |
1mW |
0.025+10 |
0.025+15 |
approx. 10mA |
| 500W |
1mW |
10mW |
0.014+3 |
0.014+8 |
approx. 10mA |
| 5kW |
10mW |
0.1W |
approx. 1mA |
| 50kW |
0.1W |
1W |
approx. 100£gA |
| 500kW |
1W |
10W |
0.015+3 |
0.015+33 |
approx. 10£gA |
| 5MW |
10W |
10W |
0.033+30 |
0.033+30 |
approx. 1£gA |
| 50MW |
100W |
100W |
0.25+30 |
0.25+30 |
approx. 100nA |
| 500MW |
1kW |
1kW |
1.5+50 |
1.5+50 |
approx. 10nA |
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| Max. input voltage: ¡Ó 500V peak |
Open circuit test voltage: 12V or less |
| The accuracy at 50W to 5kW range are specified after zero compensation through the REL operation. |
| Sample rate of FAST at 5MW to 500MW range becomes the same value as MID (approx. 20 times/sec). |
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| 8. Low-Power Resistance (2 WireW) |
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| Range |
Resolution |
Accuracy* |
Test Current |
| SLOW/MID/FAST |
SLOW/MID |
FAST |
| 500W |
10mW |
0.1+5 |
0.1+15 |
approx. 1mA |
| 5kW |
0.1W |
approx. 100£gA |
| 50kW |
1W |
approx. 10£gA |
| 500kW |
10W |
0.2+30 |
0.2+40 |
approx. 1£gA |
| 5MW |
100W |
0.2+30 |
approx. 100nA |
| 50MW |
1kW |
1.5+30 |
1.5+30 |
approx. 10nA |
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| Max. input voltage: ¡Ó 500V peak |
Open circuit test voltage: 12V or less |
| The accuracy at 500W to 5kW range are specified after zero compensation through the REL operation. |
| Sample rate of FAST at 5MW to 500MW range becomes the same value as MID (approx. 20 times/sec). |
| Indications are in 4.5 digits for SLOW, MID, and FAST. |
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| 9. Diode |
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| Test Current |
Measurement Range |
Accuracy* |
Open Circuit Test Voltave |
Max. Input Voltave |
| approx. 1mA or 10mA |
0.1mV to 5.0999V |
0.014+13 |
12V or less |
¡Ó 500V peak |
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| 10. Temperature |
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| Thermocouple |
Temperature Range to be Measured |
Accuracy* |
Resolution |
Max. Input Voltave |
| R |
-50¢XC to 0¢XC |
0.2+70 |
0.1¢XC |
¡Ó 500V peak |
| 0¢XC to +100¢XC |
0.2+50 |
| +100¢XC to +1768¢XC |
0.2+30 |
| K(CA) |
-200¢XC to -100¢XC |
0.15+50 |
| -100¢XC to 0¢XC |
0.15+35 |
| 0¢XC to +1372¢XC |
0.15+20 |
| T(CC) |
-200¢XC to -100¢XC |
0.15+50 |
| -100¢XC to 0¢XC |
0.15+35 |
| 0¢XC to +400¢XC |
0.15+20 |
| J(IC) |
-200¢XC to -100¢XC |
0.15+50 |
| -100¢XC to 0¢XC |
0.15+35 |
| 0¢XC to +1200¢XC |
0.15+20 |
| E(CRC) |
-200¢XC to -100¢XC |
0.15+50 |
| -100¢XC to 0¢XC |
0.15+35 |
| 0¢XC to +1000¢XC |
0.15+20 |
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The above accuracy values do not include the thermocouple accuracy.
¡Ó0.1¢XC/¢XC is added (for all thermocouples) with the operating ambient temperature of this product at 0¢XC to 18¢XC and 28¢XC to 50¢XC.
accuracy is not specified. In the temperature range to be measured at -200¢XC or lower,
The reference thermo electric force is calculated by the "broken line approximation" according to JIS C 1602-1995.
If this product and the thermocouple are connected via a plug, an error for contact temperature compensation is added.
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| 11. Frequency (AC couple, Crest Factor: less than 3) |
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| Sample Rate |
Reading Rate
(Gate time) |
Display Digits and Measurement Range |
Accuracy* |
| SLOW |
approx. 0.5 times/sec (1s)
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6-digit |
15.0000Hz to 1.00000MHz |
0.02+2 |
| MID |
approx. 4 times/sec (100ms) |
5-digit |
15.000Hz to 1.0000MHz |
| FAST |
approx. 10 times/sec (10ms) |
4-digit |
150.00Hz to 1.000MHz |
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AC couple: Crest factor <=3
AUTO range of ACV must be used with input attenuator.
Max. input voltage: 780 Vrms, ¡Ó 1100V peak |
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| 12. Chart for combination of Dual Function |
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DCV |
CH-B
DCV (*1) |
ACV |
DC+
ACV |
DCA |
ACA |
DC+
ACA |
2 WireW |
4 WireW(*2) |
Hz |
¢XC |
| DCV |
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CH-B
DCV (*1) |
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| ACV |
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| DC+ACV |
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| DCA |
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| ACA |
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| DC+ACA |
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| 2 WireW |
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| 4 WireW(*2) |
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| Hz |
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| ¢XC |
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| : Available |
: have a limitation |
: N/A |
- : not provided |
| (*1) CH-B DCV: VOAC7523H / 7520H only |
| (*2) 4 WireW: VOAC7522H / 7521H only |
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| 13. General |
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| MATH |
Moving Average, Scale, Decibel (dBm, dB£g), Difference, Statistics (MAX, MIN,  , s), Comparison (COMP), Arithmetic Calculation between Dual Function |
| Memory |
DATA |
Max. 3000 data with 10 msec resolution time mark (Elapsed time) |
| SET UP |
10 |
| Interfaces (Full Remote) |
Standard |
RS-232 |
| Option |
LAN, GP-IB |
| Power Supply |
Voltage |
AC100V, 110V, 220V, 240V |
| Frequency |
50Hz, 60Hz |
| Power Consumption |
21 VA (includes options) or less |
| Operation Temperature and Humidity |
0¢XC to +50¢XC (less than 80%RH)
no condensation, 70%RH or less at +40¢XC to +50¢XC |
| Storage Temperature and Humidity |
-20¢XC to +60¢XC (70%RH or less)
no condensation, includes operation temperature |
| Size |
Measurement |
210W x 99H x 353L mm (Options are built into the main unit) |
| Weight |
3.5kg (includes options) or less |
| Standard Accessories |
Fuse, Test Leads, Alignment Screwdriver, Operation Manual(CD-ROM), Power cord |
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