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GOM-804 & GOM-805

Features

  • 50,000 counts
  • 3.5” (320 x 240) TFT LCD display
  • High accuracy of 0.05% precision
  • 1Amp test current, 1µΩ resolution
  • Fast measurement of 60 readings per second
  • Four wire resistance measurement
  • Temperature compensation measurement function
  • Delayed measurement
  • 20 sets of panel setting memory
  • Dry circuit (GOM-805 only)
  • Drive modes: DC+/DC-, Pulsed, PWM, Zero (GOM-805 only)
  • Interface: USB device, RS-232C, Handler/Scan/EXT I/O, and GPIB (option)

DESCRIPTION

GW Instek launch a new series of D.C. milliohm meter ─ GOM-804/805, which abundantly feature 3.5-inch TFT display, maximum 50,000 counts measurement display, the rapid sampling rate of 60 readings per second, optimum 0.05% measurement precision, four wire measurement method as well as the temperature measurement and temperature compensation measurement function to meet the requirement of low resistance measurement application. The GOM-805 also includes various drive modes and Dry circuit for contact resistance measurement applications. More features, including 20 sets of panel setting memory and many external control interface such as RS-232C, USB, Handler/Scan/EXT IO or GPIB (option), greatly elevate GOM-804/805 milliohm meter’s convenience on practical applications.

 

GOM-804/805 adopt 3.5-inch color LCD to enhance the clarity of measurement results and to provide display for related setting criteria that tremendously brings up the completeness of test information. Additionally, GOM-804/805, with the optimum 0.05% precision, augment the measurement speed to 60 sampling rate per second and maintain the display digits of five instead of four despite of different speed selections. Furthermore, the independent functionality keys and direction keys together increase the operational convenience which allows users to complete their measurement tasks with intuitive convenience and speed.

 

GOM-805 provides Dry circuit and various drive modes (DC+, DC-, Pulsed, PWM) for measurement applications on different materials. The pulsed current output mode is suitable for interacting conductors of different materials and this output mode is to reduce the thermal EMF influence, which is caused by electric potential difference generated from different conductors acting on different temperatures while conducting low resistance measurements. The DC+ and DC- output modes are best for the measurement requirements of inductive components. The PWM output mode, ideal for changing temperature sensitive materials, can avoid resistance value variation which is due to over load happened on current measurement for a long period of time. During the DC+, DC- and Pulsed drive is supplied; the Dry circuit can work with them also. Dry circuit can limit the applied voltage under the open circuit voltage of 20mV to avoid over voltage occurred on the both ends of components. The over voltage will damage the oxide coating and the thin layer of contact surface, as a result, the validity of measurement will then be ruined. For instance, contact resistance of connector measurement is one of the applications.

 

With respect to connecting the external control, GOM-804/805 provide a D-sub 25-pin combined interface to execute, according to the functionalities, Handler, Scan or EXT IO for respectively connecting to a sorting machine; connecting to an external on-off switch, and directly conducting external trigger control. For remote control and measurement result retrieval requirements, GOM-804/805 also provide various interface selections such as RS-232C, USB, and GPIB (GOM-804(option)/GOM-805(standard) interface. Furthermore, the control commands are compatible to that of GOM-802 that saves time in adjusting programs while switching from the old model to the new model.

 

To sum up, GOM-804 evolves from GOM-802 platform with more advanced functionalities and specifications, including display digits, measurement speed and standard interface (RS-232C/USB). With all the capabilities of GOM-804, GOM-805 augments itself with new measurement abilities (Dry circuit and various drive modes) to meet the requirements of broader low resistance measurement applications.

FEATURES

General

NOTE

Specifications are ensured only for GOM-804/805 at least 30 minute of warm-up time and Operating Temperature Specification: 18~28˚C

Display

3.5'(320 x 240) TFT LCD

Memory

20 sets for panel setting

Power Source

AC 100 - 240 V, 50/60Hz

Comsumption

25VA (max.)

Dimension

223(W) x 102(H) x 283(D) mm

Weight

Approx.3kg(max.)

 

Specifications

MODEL

GOM-804

GOM-805

DISPLAY

 

50,000 counts

SAMPLING RATE

Slow

10 readings / s

Fast

60 readings / s

RESISTANCE MEASUREMENT

Range / Test current (fixed)

 

50mΩ /1A

500mΩ / 100mA

5Ω / 100mA

50Ω / 10mA

500Ω / 1mA

5kΩ / 100µA

50kΩ / 100µA

500kΩ / 10µA

5MΩ / 1µA

 

Accuracy

50mΩ : ± (0.1% of reading + 0.02% of range)

 

500mΩ ~ 50Ω : ± (0.05% of reading + 0.02% of range)

 

500Ω ~ 500kΩ : ± (0.05% of reading + 0.008% of range)

 

5MΩ : ± (0.2% of reading + 0.008% of range)

Resolution

1µΩ, 10µΩ, 100µΩ, 1mΩ, 10mΩ, 100mΩ, 1Ω, 10Ω, 100Ω

TEMPERATURE

Range

-50˚C ~399.9˚C

Accuracy

-10˚C ~40˚C : 0.3% ± 0.5˚C ; Other : 0.3% ± 1.0˚C

Resolution

0.1˚C

DRY CIRCUIT

 

-----

Open circuit less than 20mV;

For 500mΩ, 5Ω, 50Ω range only

DRIVE MODE

DC+/DC-

-----

Yes

Pulsed

-----

Yes

PWM

-----

Yes

Zero

-----

Yes

OTHER FUNCTIONS

 

Trigger – Internal, Manual, External、Math – ABS, REL, %, TC、Hi / Lo

 

Average 2 ~ 10 times、Measured delay、Go / No-Go、TC for Transformer

 

Diode、Continuity beeper、Sorting (only for GOM-805)

INTERFACE

USB

Standard

Standard

RS-232C

Standard

Standard

HANDLER/SCAN/EXT I/O

Standard

Standard

GPIB

Option

Standard

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