IWATSU VOAC7523H/7522H/7520H/7521H Iwatsu Digital Multimeter

Model：VOAC7523H/7522H/7520H/7521H Country of Origin：Japan

Category：Digital Multimeter DMM

Overview：

A single VOAC7523H/7520H unit features two DC measurement input channels and a dual display, enabling standard DC voltage measurement. Two units are required, saving installation space and improving measurement speed.
The VOAC7522H/7521H has one input channel and a dual display, allowing current or frequency measurement simultaneously with voltage measurement.
The VOAC7523H/7522H achieves high-resolution DC voltage measurement down to 0.1 μV and AC voltage bandwidth up to 300 kHz.

Features

Specifications

Application Notes

Functions & Configuration

	Full scale, 509999
	The highest full-scale count among 5.5-digit models. (Iwatsu Test Instruments Corp. research, November 2004)

	Isolated 2-channel input with dual display (VOAC7523H/7520H only)
	Provides two DC measurement inputs. The two channels are isolated from each other. Voltage comparison between two different circuits or potential difference measurements can be performed easily on components within the same circuit. A single VOAC7523H/7520H unit can perform DC voltage measurements that normally require two units, saving installation space and improving measurement speed. The VOAC7523H/7520H also features a dual display that shows the measured value for another function. For example, changing input cable connections or switching functions is required when measuring a different function with an existing single-display multimeter. A single VOAC7523H/7520H unit can perform both types of measurement simultaneously.

	Dual Display
	Traditionally, cable disconnection and function switching require different types of measurements. A single VOAC752xH series unit can perform measurements that would otherwise require multiple units, improving measurement efficiency. For example, when measuring power consumption (apparent power, VA), simultaneous voltage and current measurement enables real-time power measurement.

	Multi-Function Interface
	RS-232 is standard. LAN (Ethernet 10BASE-T) or GP-IB interfaces are available as options.

	Long-Interval Measurement up to 3000 Hours
	Interval measurements from 10 ms to 3600 s, with data logging of up to 3000 time-stamped readings and a maximum measurement duration of 3000 hours. Timestamp resolution is 10 ms.

	True RMS measurement
	All series models can measure true RMS AC voltage and AC current.

	Multi-function math functions
	Decibel operations (dBm, dBμ), scaling (SCLE), moving average (AVG), relative/differential (REL), statistics (max, min, , s), comparison (COMP), and arithmetic calculations—dual functions.

	DIO (digital input/output) output for production line use (optional)
	Combining trigger and open-collector outputs with 5-step pass/fail judgment levels makes production line use convenient.

*	Accuracy (±X% of reading +Y digits) indicated by X+Y
	The measuring accuracy indicated below can be obtained for a year following the calibration of the instrument.

1. Typical Sample Rate and Resolution

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

2. DC Volt (DCV) 50mV range is for the VOAC7523H / 7522H only.

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

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 ± 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 Volt (DCV) VOAC7523H / 7520H only

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

Max. input voltage:

± 300V, between CH-A L and CH-B ± 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	56dB or more

4. AC Volt (ACV, DC+ACV) detection of True RMS

Up to 100kHz for VOAC7521H / 7520H

Range	Resolution	Measurement Range		Input Resistance
Range	5.5-digit	SLOW	MID/FAST	Input Resistance
500mV	1μV	15Hz to 300kHz	200Hz to 300kHz	less than approx. 1MW // 100pF
5V	10μV
50V	100μV
500V	1mV	45Hz to 100kHz	200Hz to 100kHz
750V	10mV	45Hz to 20kHz	200Hz to 20kHz

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

Coefficient to input other than sine wave

Crest Factor	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%	-	-

Resnponse time

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

Max. input voltage: 780Vrms, ± 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).

5. DC Current (DCA)

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

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)

6. AC Current (ACA, DC+ACA)

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

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

Response time

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

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).

7. Resistance (2 WireW/4 WireW) 4 WireW: VOAC7522H / 7521H only

Range	Resolution		Accuracy*		Test Current
Range	SLOW/MID	FAST	SLOW/MID	FAST	Test Current
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. 100μA
500kW	1W	10W	0.015+3	0.015+33	approx. 10μA
5MW	10W	10W	0.033+30	0.033+30	approx. 1μA
50MW	100W	100W	0.25+30	0.25+30	approx. 100nA
500MW	1kW	1kW	1.5+50	1.5+50	approx. 10nA

Max. input voltage: ± 500V peakOpen circuit test voltage: 12V or lessThe 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).

8. Low-Power Resistance (2 WireW)

Range	Resolution	Accuracy*		Test Current
Range	SLOW/MID/FAST	SLOW/MID	FAST	Test Current
500W	10mW	0.1+5	0.1+15	approx. 1mA
5kW	0.1W			approx. 100μA
50kW	1W			approx. 10μA
500kW	10W	0.2+30	0.2+40	approx. 1μA
5MW	100W	0.2+30	0.2+30	approx. 100nA
50MW	1kW	1.5+30	1.5+30	approx. 10nA

Max. input voltage: ± 500V peakOpen circuit test voltage: 12V or lessThe 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.

9. Diode

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	± 500V peak

10. Temperature

Thermocouple	Temperature Range to be Measured	Accuracy*	Resolution	Max. Input Voltave
R	-50°C to 0°C	0.2+70	0.1°C	± 500V peak
	0°C to +100°C	0.2+50
	+100°C to +1768°C	0.2+30
K(CA)	-200°C to -100°C	0.15+50
	-100°C to 0°C	0.15+35
	0°C to +1372°C	0.15+20
T(CC)	-200°C to -100°C	0.15+50
	-100°C to 0°C	0.15+35
	0°C to +400°C	0.15+20
J(IC)	-200°C to -100°C	0.15+50
	-100°C to 0°C	0.15+35
	0°C to +1200°C	0.15+20
E(CRC)	-200°C to -100°C	0.15+50
	-100°C to 0°C	0.15+35
	0°C to +1000°C	0.15+20

The above accuracy values do not include the thermocouple accuracy.±0.1°C/°C is added (for all thermocouples) with the operating ambient temperature of this product at 0°C to 18°C and 28°C to 50°C.accuracy is not specified. In the temperature range to be measured at -200°C 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.

11. Frequency (AC couple, Crest Factor: less than 3)

Sample Rate	Reading Rate (Gate time)	Display Digits and Measurement Range		Accuracy*
SLOW	approx. 0.5 times/sec (1s)	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

AC couple: Crest factor <=3AUTO range of ACV must be used with input attenuator.Max. input voltage: 780 Vrms, ± 1100V peak

12. Chart for combination of Dual Function

	DCV	CH-B DCV *^(1)**	ACV	DC+ ACV	DCA	ACA	DC+ ACA	2 WireW	*4 WireW^(2)**	Hz	°C
DCV
CH-B DCV *^(1)**									-
ACV
DC+ACV
DCA
ACA
DC+ACA
2 WireW
*4 WireW^(2)**		-
Hz								-
°C

: Available

: have a limitation

: N/A

- : not provided

(*1) CH-B DCV: VOAC7523H / 7520H only(*2) 4 WireW: VOAC7522H / 7521H only

13. General

MATH	Moving Average, Scale, Decibel (dBm, dBμ), 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)
Memory	SET UP	10
Interfaces (Full Remote)	Standard	RS-232
Interfaces (Full Remote)	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°C to +50°C (less than 80%RH) no condensation, 70%RH or less at +40°C to +50°C
Storage Temperature and Humidity		-20°C to +60°C (70%RH or less) no condensation, includes operation temperature
Size	Measurement	210W x 99H x 353L mm (Options are built into the main unit)
Size	Weight	3.5kg (includes options) or less
Standard Accessories		Fuse, Test Leads, Alignment Screwdriver, Operation Manual(CD-ROM), Power cord

Options:

Product Name	Part Number	Image of Product
LAN interface *1	SC-351
DIO interface *2	SC-352
GP-IB interface *1	SC-353
D/A Converter interface *2	SC-354
RS232-USB Converter (WindowsXP,Vista,7)	SC-525

4-wire ohms test leads	SC-005
High-voltage probe 30kVdc max. (can be used only in the Zin of 10MW range)	SC-003
Clamp-on current probe DC ± 200A MAX AC150A rms MAX (40Hz to 500Hz)	SC-011
Sheath-type thermocouple (Type K) -200°C to +800°C	SC-0107
Surface thermocouple (Type K) 0°C to +500°C	SC-0116

Banana plug (Can be used to connect a thermocouple)	POMONA1286
High-resistance test lead	SC-004
Test leads	SC-020
Arrow clip For SC-020 (AC30V/DC60V/DC3A)	SC-021
Alligator clip For SC-020 (AC30V/DC60V/DC10A)	SC-022
Alligator clip H For SC-020 (600Vrms, CAT II/10A)	SC-023

*1	The LAN interface SC-351 and GP-IB interface SC-353 cannot be installed at the same time.
*2	The DIO interface SC-352 and D/A Converter interface SC-354 cannot be installed at the same time.

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