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GDM-8351 - 5 1/2 Digit Dual Measurement Multimeter

Overview
Features
Information
Calibration

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              
dBm            
Max/Min            
Relative            
Hold            
Compare            
Math            

 

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.

  • 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)

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 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 0.05 + 15
100.000 mA 1μA 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

Temperature (Thermocouple)

-200 °C ~ 0 °C 0.01 °C   J / T / K 0.4 °C (typical)
0 °C ~ +300 °C 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

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