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.

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"

The maximum measuring current for each range of resistance measurement is:

The example below shows how to set the DC voltage to a fixed range on the GDM-8246.The example below shows how to set the DC voltage to a fixed range on the GDM-8246.
1. There are 5 DC voltage ranges: 500mV, 5V, 50V, 500V and 1000V
2. The basic unit is “V”, please refer to Table 6-1 on page 26 of programming manual for further details.
3. The command to set the voltage range is: CONF:VOLT:DC <NR2>

(When <NR2> = 0, the range is set to auto-range; when <NR2> ≠ 0, a fixed range is set)(When <NR2> = 0, the range is set to auto-range; when <NR2> ≠ 0, a fixed range is set)
Therefore, the commands below will the set the range:
:CONF:VOLT:DC 0 (DCV function, Auto-range)
:CONF:VOLT:DC 0.5 (DCV function, 500mV range)
:CONF:VOLT:DC 5 (DCV function, 5V range)
:CONF:VOLT:DC 50 (DCV function, 50V range)
:CONF:VOLT:DC 500 (DCV function, 500V range)
:CONF:VOLT:DC 1000 (DCV function, 1000V range)

Likewise, the DC current range can also be set:Likewise, the DC current range can also be set:

1. There are 6 DC current ranges: 500uA, 5mA, 50mA, 500mA, 2A (2000mA) and20A(20000mA)
2. The basic unit is “mA”, please refer to Table 6-1 on page 26 of programming manual for further details.
3. The command to set the current range is :CONF:CURR:DC <NR2>

(When <NR2> = 0, the range is set to auto-range; when <NR2> ≠ 0, a fixed range is set)(When <NR2> = 0, the range is set to auto-range; when <NR2> ≠ 0, a fixed range is set)
Therefore, the commands below will set the current range:
:CONF:CURR:DC 0 (DCA function, Auto-range)
:CONF:CURR:DC 0.5 (DCA function, 500uA range)
:CONF:CURR:DC 5 (DCA function, 5mA range)
:CONF:CURR:DC 50 (DCA function, 50mA range)
:CONF:CURR:DC 500 (DCA function, 500mA range)
:CONF:CURR:DC 2000 (DCA function, 2A range)
:CONF:CURR:DC 20000 (DCA function, 20A range)

The simplest way to set a fixed range is to fill in the <NR2> parameter with the value expected for the device under test and the unit for the expected value in accordance to Table 6-1 shown on page 26 of he GDM-8246 programming manual.

The GDM-8246 reading rate (reading/second) are:

The GDM-825xA series reading rate (reading/second) are:

There are four different between GDM-8251A and GDM-8251：

1. The number of range for AC/DC Current

2. The maximum input for small current terminal of AC/DC Current

3. The Interface

4. Recall the last condition whilst turn on

Note：GDM-8251A reload the factory default whilst turn on every time, unless there is a customer defined for recall.

There are four different between GDM-8255A and GDM-8255：

1. The number of range for AC/DC Current

2. The maximum input for small current terminal of AC/DC Current

3. The Interface

4. Recall the last condition whilst turn on

Note：GDM-8255A reload the factory default whilst turn on every time, unless there is a customer defined for recall.

The GDM-8246 accepts the following as the message terminator whilst giving a command.

Yes, you need to use the Null Modem cable which the transmit (TxD) and receive (RxD) lines are cross-linked.

The GDM-8246 RS232 configuration as below:

The REL and REL# are relative value measurement function.The REL and REL# are relative value measurement function.

• For REL: It directly captures the current primary display value shows on secondary display as the relative value. For example, a 2-wire resistance measurement, to eliminate the residual resistance of test leads.
• For REL#: It allows user to key in a certain number as a relative value, then to display the difference between the relative value and the input measurement on primary display. For example, if the relative value is 10.0000 V and the present inputmeasurement is 14.1000 V, the display will show 4.1000 V.