Step 1: Enter the Compare mode, set the upper limit and lower limit of acceptance

Step 2: Pass/Fail signal will be output from the rear panel handler interface, pin 6 is Pass, pin 4 is Fail

Step 3: Connect the above signal to the PLC, which is controlled by the PLC. If you want to directly drive the device (such as a warning light) with a signal, you must be aware of the driving capacity. When the driving capacity is insufficient, an external driving circuit must be added. Refer to the external drive circuit diagram as follows.

Figure 1 PLC

Figure 2 PLC+Relay

For advice on automated production line measurement to avoid misjudgments and improve test productivity, please search for FAQs under the title below

"Suggestions for Avoiding Misjudgments and Improving Test Capacity for Production Line Automated Measurement of Micro-ohmmeter GPM-804/GOM-805"

Suggestion 1: Use an external trigger. If the preset internal trigger is used, many unqualified data will be generated before the product is not connected or the test fixture is not successfully connected. This problem can be avoided by external triggering.

Suggestion 2: Use a fixed level. Avoid time-wasting caused by automatic level shifting.

Suggestion 3: Avoid the error of the test fixture. The fixture should be as short as possible, and the anti-interference ability is strong. Fixtures are reset to zero.

Suggestion 4: If a relay is used to switch test points, the relay should be as close to the DUT as possible.

Instruments that measure amplitude (multimeter or oscilloscope) must be measured at full scale to achieve the best accuracy.

When learning the pointer multimeter, it is usually switched to the highest voltage level, such as 1000V to protect the input of the meter. At this time, the pointer swing range is small (the accuracy and resolution are not good), and then change obtain the reading after switching to the small level and getting the best measurement level close to full scale.

But in the era of digital multimeters, they usually have the function of Auto Range (automatic adjustment of levels), but because it is impossible to observe the current resolution in the range like an pointer multimeter, the simulated swing range of a  pointer multimeter (Analog Bar) function allows users to know the current resolution status. After the automatic adjustment of the level, if the Analog Bar is only half or lower, the level should be manually adjusted to achieve full scale measurement.

GW Instek’s multimeters with analog bar function include GDM-541 and GDM-533.

Compatibility mode setting method, the command is compatible with Keysight (HP, Agilent) 34401A, 34460A, 34461A)

Setting steps:

Step 1. Press the menu button

Step 2. Press the Next Page button twice to go to the Interface page

Step 3. Press the Next Page button or selector knob until the SCPI ID "identification"

Step 4. Press the enter (knob) key to select the SCPI ID as User

Step 5. Press the Enter key to select Finish

Micro-ohmmeter GOM-804, GOM-805 firmware is divided into Master (main firmware file) version and Slave (affiliated firmware file) version.

Precautions on Firmware Update:

1.Please burn the Slave (affiliated firmware file) version first.

2.The master firmware version (Master) version 3.06 (and later) needs to be matched with the affiliated firmware version (Slave) version 3.04 (and latest)

3.During the firmware update, the instrument cannot be powered off. Such interruption will cause the update to fail and the instrument will not be able to boot normally.

Preparations before firmware upgrade:

Preparation 1: Please download TI (Texas Instruments) LM Flash Programmer

https://www.ti.com/tool/LMFLASHPROGRAMMER

https://www.dropbox.com/s/pbnxhx3qzl25pbp/LMFlashProgrammer.rar?dl=0

Preparation 2: Download DFU driver (driver)

https://www.dropbox.com/s/36zdsi10oqe0gdq/DFU%20Driver%20Setup.7z?dl=0

Preparation 3: Join GW Instek membership, download the latest firmware of GOM-804, GOM-805, including Master and Slave.

Firmware upgrade steps:

Steps to burn Slave

Step 1: Connect the computer to the instrument via a USB cable

Step 2: Press and hold the ESC and RANGE keys of the instrument at the same time and then press the POWER key to turn on

Step 3: Release the ESC and RANGE keys after the BootLoader Mode Slave update text appears on the screen

Step 4: Open the TI LM Flash Programmer program on the computer, perform configuration, and select USB DFU for Interface.

Step 5: Click Program (burning) of TI LM Flash Programmer, Browse of Select .bin file, select the folder where the Slave BIN file is located and click the latest version after downloading

Step 6: After confirming the programming file, click the Program button to start programming

Step 7: After the programming is completed, remove the connection between the computer and the instrument, turn off the instrument and restart it to confirm the system firmware version. If it has been updated to a newer version, it means the update is successful.

Steps to Burn Master

Step 1: Connect the computer to the instrument via a USB cable

Step 2: Press and hold the ESC and DRIVE keys of the instrument at the same time, then press the POWER key to turn on

Step 3: Release the ESC and DRIVE keys after the BootLoader Mode Master update text appears on the screen

Step 4: Open the TI LM Flash Programmer program on the computer, perform configuration, and select USB DFU for Interface.

Step 5: Click Program (burning) of TI LM Flash Programmer, Browse of Select .bin file, select the folder where Master BIN file is located and click the latest version after downloading

Step 6: After confirming the programming file, click the Program button to start programming

Step 7: After the programming is completed, remove the connection between the computer and the instrument, turn off the instrument and restart it to confirm the system firmware version. If it has been updated to a newer version, it means the update is successful.

Micro-ohmmeter GOM-804, GOM-805 have two power-on settings

Setting 1: You can choose to use the settings before the last shutdown when starting up

It is suitable for the situation where the instrument user is dedicated and the measurement project has not changed.

Setting 2: You can choose to use the factory default settings when starting up

It is suitable for multiple users to share the instrument, and the measurement projects and settings of each user are greatly different in usage scenarios

How to change boot settings:

Step 1: Select System from System menu icon

Step 2: Use the up, down, left and right keys to select Power ON Status Setup

Step 3: Select Recall Previous Settings and Load Default

There are two ways to measure the current. The first is to use an inductive CT (AC current) or a Hall element (induce a DC current); the second is to use a current shunt.

Since the accuracy of the inductive current sensor is not high, the second method is adopted in the current calibration, and it must be a precise current shunt. Precision current shunts are actually precision resistors, because resistors have temperature effects, and components with low temperature drift coefficients are required to ensure accuracy.

GW Instek and Prodigit are currently the leading manufacturers of precision current shunts.

GW Instek PCS-1000I (current range 300A) has a built-in measurement capability of 6 1/2 digits multimeter, which can simplify wiring and reduce the load effect caused by extra wiring.

Prodigit

7550A current range: 1uA~250A

1000A current range: 1uA~1000A (1000A-R is input from the rear panel)

2000A current range: 1uA~2000A (2000A-R is input from the rear panel)