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Q1 gw_product_detail_bar.png gw_product_detail_bar.png 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.

 

Q2 gw_product_detail_bar.png gw_product_detail_bar.png The micro-ohmmeter GOM-804, GOM-805 are used for automatic selection after the pass/fail judgment of the production line?

 

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.

GOM_PLC_Relay 

Figure 1 PLC

GOM_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"

Q3 gw_product_detail_bar.png gw_product_detail_bar.png What is the maximum measuring current for each range of 2-wire or 4-wires resistance measurement of GDM-825xA?

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

 

Ranges 2W 4W  
100.000Ω 0.5mA 0.5mA  
1.00000kΩ 0.5mA 0.5mA  
10.0000kΩ 0.2mA 0.2mA  
100.000kΩ 19.4µA 19.4µA  
1.00000MΩ 2.0µA 2.0µA  
10.0000MΩ 0.2µA 0.2µA  
100.000MΩ 0.2µA 0.2µA  
Note:      
Constant Voltage mode, reference voltage 2V for all range
Maximum Current is when the DUT = 0Ω
Q4 gw_product_detail_bar.png gw_product_detail_bar.png How do I set the current or voltage range for the GDM-8246 with remote commands? (Example by DC Voltage/Current)

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.

 

Q5 gw_product_detail_bar.png gw_product_detail_bar.png What is the reading rate for the GDM-8246?

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

Function Rate
DCmV 5
DCV 5
DCA 5
DC20A 5
ACmV 5
ACV 5
ACA 5
AC20A 5
ACV+DCV 1.25
ACI+DCI 1.25
Ω 5
CONT 5
CAP 0.4~3
Diode 5
Q6 gw_product_detail_bar.png gw_product_detail_bar.png What is the reading rate for the GDM-825xA series?

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

Function Rate
   S  M  F
 DCV  10  30  60
 DCI  10  30  60
 ACV  1  5  20
 ACI  1  5  20
 2/4W (10MΩ/100MΩ)  1  1.5  2
 2/4 W (other ranges)  3  5  8
 ACV+DCV  0.5  1  3
 ACI+DCI  0.5  1  3
 Diode  30  30  60
Q7 gw_product_detail_bar.png gw_product_detail_bar.png What is different between GDM-8251A and GDM-8251?

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

 

1. The number of range for AC/DC Current

GDM-8251A GDM-8251
4 ranges 3 ranges

 

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

GDM-8251A GDM-8251
2A max. 0.1A max.

 

3. The Interface

  GDM-8251A GDM-8251
RS232 Standard Standard
Digital I/O Standard Standard
USB Device Standard Standard
Scanner Card X X

 

4. Recall the last condition whilst turn on

GDM-8251A GDM-8251
Recall factory default Recall the last condition

 

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

Q8 gw_product_detail_bar.png gw_product_detail_bar.png What is different between GDM-8255A and GDM-8255?

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

 

1. The number of range for AC/DC Current

GDM-8255A GDM-8255
4 ranges 3 ranges

 

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

GDM-8255A GDM-8255
2A max. 0.1A max.

 

3. The Interface

  GDM-8255A GDM-8255
RS232 Standard Standard
Digital I/O Standard Standard
USB Device Standard Standard
Scanner Card Optional X

 

4. Recall the last condition whilst turn on

GDM-8255A GDM-8255
Recall factory default Recall the last condition

 

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

Q9 gw_product_detail_bar.png gw_product_detail_bar.png What is the message terminator for GDM-8246?

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

RS-232 Message terminator LF Line feed code
GPIB Message terminators LF^END Line feed code (hexadecimal 0A) with END message
  LF Line feed code
  <dab>^END Last data byte with END message
Q10 gw_product_detail_bar.png gw_product_detail_bar.png Does any require for RS232 cable whilst connecting with GDM-8246?

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

Q11 gw_product_detail_bar.png gw_product_detail_bar.png What is the RS232 configuration for GDM-8246?

The GDM-8246 RS232 configuration as below:

RS-232 configuration Connector DB-9, Male
  Baud rate 9600 (default)
  Data bit 8
  Parity None
  Stop bit 1
  Flow control None
Q12 gw_product_detail_bar.png gw_product_detail_bar.png Regarding to the GDM-825xA series, what is different between REL and REL# function?

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.
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