Instek GDM-8351 5 ½ Digit Dual Measurement Multimeter

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Product Code: GDM-8351

Description

Application Notes

Extended Information

Datasheet PDF format

SPECIFICATIONS (*1)

Function
Range (*2)	Resolution	Input Resistance etc.	Accuracy(*3) 1 Year (23°C±5°C)
DC Voltage
100.000 mV	1μV	10MΩ or >10GΩ	0.012 + 8
1.00000 V	10μV	10MΩ or >10GΩ	0.012 + 5
10.0000 V	100μV	11.1MΩ	0.012 + 5
100.000 V	1mV	10.1MΩ	0.012 + 5
1000.00 V	10mV	10MΩ	0.012 + 5
Resistance
100.000 Ω	1mΩ	1mA	0.05 + 8
1.00000 kΩ	10mΩ	1mA	0.05 + 5
10.0000 kΩ	100mΩ	100μA	0.05 + 5
100.000 kΩ	1Ω	10μA	0.05 + 5
1.00000 MΩ	10Ω	1μA	0.05 + 5
10.0000 MΩ	100Ω	0.5μA	0.30 + 5
100.000 MΩ	1kΩ	0.5μA //10 MΩ	3.00 + 8
DC Current
10.0000 mA	100nA	1Ω	0.05 + 15
100.000 mA	1μA	1Ω	0.05 + 5
1.00000 A	10μA	0.1Ω	0.20 + 5
10.0000 A	100μA	0.01Ω	0.20 + 5
Continuity
1000.00 Ω	10mΩ	1mA	0.05 + 5
Diode Test
6.0000 V	100μV	1mA@6V	0.05 + 15
Capacitance
10.00 nF	0.01nF	10μA	2.0 + 10
100.0 nF	0.1nF	10μA	2.0 + 4
1.000 μF	0.001μF	100μA	2.0 + 4
10.00 μF	0.01μF	1mA	2.0 + 4
100.0 μF	0.1μF	1mA	2.0 + 4
True RMS AC (or AC+DC – AC Coupled) Voltage
100.000 mV	1μV	20Hz – 45Hz	1.0 + 100
		45Hz – 10kHz	0.3 + 100
		10kHz – 30kHz	1.5 + 300
		30kHz – 100kHz	5.0 + 300
1.00000 V	10μV	20Hz – 45Hz	1.0 + 100
		45Hz – 10kHz	0.2 + 100
		10kHz – 30kHz	1.0 + 100
		30kHz – 100kHz	3.0 + 200
10.0000 V	100μV	20Hz – 45Hz	1.0 + 100
		45Hz – 10kHz	0.2 + 100
		10kHz – 30kHz	1.0 + 100
		30kHz – 100kHz	3.0 + 200
100.000 V	1mV	20Hz – 45Hz	1.0 + 100
		45Hz – 10kHz	0.2 + 100
		10kHz – 30kHz	1.0 + 100
		30kHz – 100kHz	3.0 + 200
750.00 V	10mV	20Hz – 45Hz	1.0 + 100
		45Hz – 10kHz	0.2 + 100
		10kHz – 30kHz	1.0 + 100
		30kHz – 100kHz	3.0 + 200
True RMS AC (or AC+DC – AC Coupled) Current
10.0000 mA	100nA	20Hz – 45Hz	1.5 + 100
		45Hz – 2kHz	0.5 + 100
		2kHz – 10kHz	2.0 + 200
100.000 mA	1μA	20Hz – 45Hz	1.5 + 100
		45Hz – 2kHz	0.5 + 100
		2kHz – 10kHz	2.0 + 200
1.00000 A	10μA	20Hz – 45Hz	1.5 + 100
		45Hz – 2kHz	0.5 + 100
		2kHz – 10kHz	2.0 + 200
10.0000 A	100μA	20Hz – 45Hz	1.5 + 100
		45Hz – 2kHz	1.0 + 100
		2kHz – 10kHz	-----
Frequency
(Voltage)10Hz – 1MHz	------	------	0.01 + 3
(Current)20Hz – 10kHz	------	------	0.01 + 3
Temperature (Thermocouple)
-200 °C ~ 0 °C	0.01 °C	J / T / K	0.4 °C (typical)
0 °C ~ +300 °C	0.01 °C	J / T / K	0.2 °C (typical)
Display
VFD, Tow Colors Display
Interface
RS-232C, USB device (USBCDC & USBTMC)
Power Source
AC 100 V / 120 V / 220 V / 240 V ±10%, 50-60Hz ; Power Consumption Max. 15VA
Dimensions & Weight
265(W) x 107(H) x 302(D) mm ; Approx. 2.9kg

1. All specifications are applicable to the main (1st) display only and warmed up for at least 30 minutes and operated in the slow rate.
2. 20% overrange on all ranges, except 750V/10A range
3. Accuracy: ± (% of Reading + Digits)

Features
* 120,000 counts, VFD display
* Dual measurement/Dual display
* The basic precision of DC voltage: 0.012%
* Selectable measurement speeds, the maximum: 320 Readings/s
* True RMS (AC，AC+DC) measurements
* Auto/manual selection
* 12 different measurement functions: AC/DC voltage, AC/DC current, AC+DC voltage/current, 2W/4W resistance, continuity beeper, diode test, capacitance, frequency, temperature
* Many auxiliary functions: Max./Min., REL/REL#, Compare, Hold, dB, dBm, Math (MX+B, %, 1/X)
* Digital I/O provides dual mode (standard Compare and User definition modes)
* Standard RS-232C and USB device interface (support USBCDC and USBTMC modes)

GW Instek presents the brand new 5 1/2 Digit Dual Measurement Multimeter─ GDM-8351 to replace GDM-8251A of the same category. GDM-8351 features VFD dual-display, maximum 120,000 counts, 0.012% basic DC voltage accuracy and USB/RS232C connectors to provide users with measurement precision, lucid data observation, and the convenient connection with the personal computer.

In addition to the fundamental measurement items such as AC/DC voltage, AC/DC current, AC+DC voltage/current, 2W/4W resistance, frequency, temperature measurement, continuity beeper and diode test, GDM-8351 also equips with the capacitance measurement function. Furthermore, the GDM-8351 also provides many auxiliary functions, including maximum/minimum values, dB, dBm, compare, reading hold, algorithms (MX+B, 1/X, %) etc. to meet the measurement requirements for manufacturing process tests, educational experiments and testing facilities.

For the external control, the pin of digital I/O interface not only provides the signal output frequently used by the compare function, but also allows users to define signal output for each pin. Under the self-definition mode, users can apply the I/O as a simple digital hardware. The external control requirement can be achieved by signals from each pin so as to help users reduce trouble of making hardware.

With respect to remote control and retrieving data, GDM-8351, taking consideration of users’ habitual practice and universal system interface, provides standard RS-232C and USB interface to edit control programs and read measurement results. It is worth noting that for utilizing the USB interface, users have options of selecting either USBCDC or USBTMC mode. While USBTMC is selected, users are able to control instrument with the USB interface exactly the same as controlling instrument with the GPIB interface; therefore, the relatively expensive GPIB connection cable is no longer required.

Dual measurement/Dual dispaly

GDM-8351, similar to GW Instek 6 1/2 and 5 1/2 digit multimeters, equips with VFD dual display to support the possible combinations of measurement items. For example, the DC voltage and current or DC voltage with AC element will appear when monitoring components of test wiring. The results of each measurement will simultaneously appear on different displays that not only save users’ precious time but also exempt users from the trouble of selecting displays while reading measurement results.

Selectable measurement speeds

GDM-8351 has fastest measurement speed among the same category products and three selectable measurement speeds are available - slow/medium/fast. For instance, the DC voltage measurement can reach 320 readings per second on the fast mode, which can maximize the effectiveness of each measurement.

Function vs. Speed(reading/s)	slow(S)	medium(M)	fast(F)
DCV/DCI/R	10	40	320
ACV/ACI	10	40	320
Continuity beeper/diode	10	40	320
Frequency/period	1	9.8	83
Temperature	10	40	320
Capacitance	2	2	2

Various measurement items and functionalities

GDM-8351 provides various measurement items and functionalities compared with that of the products of same category. There are twelve major measurement items of GDM-8351, including AC voltage/current, DC voltage/current, AC+DC voltage/current, two-wired and four-wired resistance, temperature, frequency, diode and continuity beeper test, and even the capability of measuring capacitance. Many auxiliary functions, such as maximum/minimum values, reading hold, relative values, dB, dBm, algorithms (MX+B, 1/X, %) and compare, are designed to reinforce the major measurement items to satisfy users’ daily working requirements.

	Major measurement items
Auxiliary functions	V	I	R	F	Temp.	Diode	Capa.
dB	●	X	X	X	X	X	X
dBm	●	X	X	X	X	X	X
Max/Min	●	●	●	●	●	X	●
Relative	●	●	●	●	●	X	●
Hold	●	●	●	●	●	X	X
Compare	●	●	●	●	●	X	●
Math	●	●	●	●	●	X	X

Convenient Digital I/O function

Another difference, while comparing with GDM-8251A, is that the Digital I/O of GDM-8351 provides two different modes which are general and self-definition. With the general mode, Digital I/O will output Hi Fail、Lo Fail、Pass and EOM (end of measurement) based upon the results of the compare function and, furthermore, external trigger input is also provided. Under the self-definition mode, users can define output conditions for four pins (SET1~SET4) to execute the external control.

Free software-remote control and data retrieving

GDM-8351 provides free software- Excel ADDins for users’ easy access. After installing the software, Microsoft Excel will establish Marco for users to directly control the setting of GDM-8351 to record the results of the measurements. The recorded data will be synchronously transformed into graphic displays via Excel drawing function that not only eliminates the cost and time of developing programs but also overcomes the compatibility issue of different programming languages.

Command compatibility

For GDM-8251A users, GDM-8351 also provides compatible commands. Users can replace machines through the simple setting of GDM-8351 without worrying the extra cost to modify the existing program and the delay of production time.

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