Scanner Card
GDM-SC1A
INSTALLATION GUIDE
REV. 01
ISO-9001 CERTIFIED MANUFACTURER
This manual contains proprietary information, which is protected by
copyrights. All rights are reserved. No part of this manual may be
photocopied, reproduced or translated to another language without
prior written consent of Good Will company.
The information in this manual was correct at the time of printing.
However, Good Will continues to improve products and reserves
the right to change specifications, equipment, and maintenance
procedures at any time without notice.
Good Will Instrument Co., Ltd.
No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City, 236, Taiwan.
SCANNER CARD
Scanner
Installation
Scanner Installation ................................................ 4
Select Channel group and enable scanner ............... 6
Connect wire .......................................................... 10
Scanner Configuration Record ............................... 14
Specification
Specifications ........................................................ 16
GDM-8255A Reading rates &Specifications ........... 17
GDM-8261A Reading rates &Specifications ........... 17
How to
Thermocouple
measurement
Thermocouple measurement ................................. 23
DMM_SCAN_CARD Software ................................ 26
SCANNER CARD
The optional scanner, GDM-SC1A, lets you
effectively measure multiple channels when
connected to a GDM-8255A, GDM-8261 or
GDM-8261A multimeter. Up to two GDM-SC1A
scanner cards can be installed into the GDM-8255A
or one GDM-SC1A into the GDM-8261 or
GDM-8261A. If two scanner cards are installed,
one can be selected as the master scanner, and the
other as the slave.
3
GDM-SC1A Scanner Card
2-wire channel
16 pairs
Maximum current
2A (ch17, ch18)
4-wire channel
8 pairs
Resistance
2/4 wire
Single wire channel
N/A
Cold junction
Temperature
Sensors (Analog)
Maximum voltage
250V
Connection
Screw terminal
Open
Scanner
cover
1. Take off four screws from the bottom panel of the
scanner.
2. Remove the top panel.
GDM-SC1A Basic Specifications
Scanner Installation
Configure scanner
4
SCANNER CARD
3. Note the connection terminals.
Overview
16 general purpose channels are available, 8 on the left row,
8 on the right row. Current (ACI, DCI) measurement uses
2 extra channels. All channels are fully isolated (Hi and Lo).
Scan/Step
connection
Refer to the below table for measurement and test line
connection. Note: Not all items can be used with GDM-8255A.
Item
No. of wires
No. of channe ls
DCV, ACV
Diode/Continuity
Period/Frequency
2 wires (H, L)
16 (CH1 ~ 16)
DCI, ACI
2 wires (H, L)
2 (CH17, 18)
Maximum current : 2A
Temperature
simulation
Cold junction
(Separate Chapter)
2 wires (H, L)
2 wires (H, L)
16 (CH1 ~ 16) for
temperature
15 (CH2 ~ 16) for
temperature, CH1 for
Cold junction
2W Resistance
Temp. 2W RTD
2 wires (H, L)
16 (CH1 ~ 16)
4W Resistance
Temp. 4W RTD
4 wires
(Input H, L
+ Sense H, L)
8 pairs (CH1 [input]&
9[sense], 2&10,....8&16)
5
GDM-SC1A Scanner Card
Background
When 2 scanner modules are installed in the
GDM-8255A, 2 groups of 18 channels each are
available. The scanner modules have a jumper to
configure which scanner is for which group. If only
one scanner is installed, the scanner should always
be configured to group 1(CH101~CH118).
The GDM-8255A can have up to 2 scanner modules
installed, whilst the GDM-8261/GDM-8261A can
have only 1 scanner module installed.
Group1
CH101 ~ 118
Group2
CH201 ~ 218
Select group
(Jumper J8)
(Preset
MASTER)
Set the jumper J8 in the center of the board
accordingly. Move the jumper to the right for
selecting CH1xx (101 ~ 118), and move to the left
for selecting CH2xx (201 ~ 218). If two scanners
are installed, set one scanner to Master (CH1xx) and
the other to Slave. If only one scanner is installed,
set the jumper to Master.
CH201-218
SLAVE
CH101-118
MASTER
J8
Select Channel group and enable scanner
6
SCANNER CARD
Enable scanner
(Jumper J9)
(Preset Enabled)
Set the jumper J9 on the rear side of the board
accordingly. Move the jumper up to disable the
scanner, and down to enable the scanner.
Enable cold
junction points
(Jumper J10)
(Preset Disabled)
Set the jumper J10 on the Bottom left of the
board accordingly. Move the jumper up (COLD
COMPEN) for selecting CH1 to Enable the Cold
Junction, or down(CH1) for selecting CH1 to
Disabled the Cold Junction.
J10
COLD
COMPEN
CH1
J9
Disable
Enable
7
GDM-SC1A Scanner Card
Note
Do Not set the jumpers horizontally as the figure
below shown, which will Not enable the target
functions.
Erroneous
example
8
SCANNER CARD
Overview
The temperature sensor provides a positive slope
output of 10 mV / °C
Equation
The temperature sensor voltage output (Vout)
calculates given temperature (Ta):
Ta = (Vout – Voffs) / Tc (Equation)
where
• Vout is the temperature sensor voltage output for a
given temperature
• Ta is the given temperature °C
• Tc is the temperature coefficient 10mV/ °C
• Voffs is the temperature sensor voltage offset =
500mV
Example
The temperature sensor voltage 0.785V
Ta = (0.785 – 0.5 ) / 0.01 = 28.5°C
The calculates given temperature 28.5°C
Temperature sensor Calculation
9
Connect wire
Wire selection
Make sure the wires have at least the same Voltage and
Current capacity as the maximum ratings in the
measurement.
When measuring TC, it has the possibility that CH1 is
being regarded as cold junction. In order to prevent
conflicts, it is suggested initiating from CH2 for wiring.
Connection
1. Turn the screw left (loose) using the screw driver
and insert the wire. Turn the screw right (tight) and
secure the connection.
Tighten
Loosen
Insert
2. Route the wires as follows, using the two openings
(left and right) at the front cover.
GDM-SC1A Scanner Card
10
SCANNER CARD
Note
When using thermocouple measurement, The
temperature sensor inside the scanner box. Move
the J10 JUMP to cold compensation, and the CH1
value is switched to the temperature sensor value.
You can use this temperature as a cold junction
compensation.
Temperature Sensor
J10 CH1
When J10 JUMP is set to cold compensation,
CH1 original connection external signal will lose
its function, Change to the temperature sensor
3. Tightly bundle the wires with cable ties which go
through the bottom holes at the front cover as the
following figures shown.
11
GDM-SC1A Scanner Card
4. Close the top cover and tighten the screws from the
bottom.
Configuration
Record
Print out the configuration record list on page14, fill in
the details, and keep it with the DMM.
Power Off
Turn the Power Off and take out the power cord.
Open the rear
panel slot
Take out the two screws on the slot corners to
remove the optional slot cover. Keep the screws for
later reuse.
GDM-8255A shown
Insert scanner
12
SCANNER CARD
Insert the
scanner
Insert the scanner (already configured according to
the procedures on page4) to either the top or
bottom slot (GDM-8261/GDM-8261A only has 1
slot). Close the cover by tightening the screws.
GDM-8255A shown
Power On
Connect the power cord and turn On the power.
CAUTION
Do not input voltages exceeding 250V to the front
input terminals whilst the scanner module is
installed.
WARNING
Do not connect any leads to the front input
terminals while the scanner is active. Input signals
scanned by the scan module also appear on the
front terminals.
13
GDM-SC1A Scanner Card
Channel
Wire color
Measure type
Note
CH1
H L CH2
H L CH3
H L CH4
H L
CH5
H L
CH6
H L CH7
H L CH8
H L CH9
H L CH10
H L CH11
H L CH12
H L CH13
H L CH14
H L CH15
H L CH16
H L CH17
H L CH18
H L CARD INPUT
H L CARD SENSE
H L AMPS
H L
Scanner Configuration Record
14
SCANNER CARD
Note
All specifications are ensured only under a single
display.
At least 30 minutes of warm-up time is required
before applying these specifications.
General
measurement
channels
16 channels of 2-pole relay input, which are configurable
to be 8 channels of 4-pole inputs
Dedicated
current
measurement
channels
2 (Channel 17,18)
Maximum Signal
Level
Channels 1-16: 250V DC or rms, 1A switched, 30 W,
62.5VA (resistive load)
Channels 17-18: 60V DC or 30V rms, 2A switched, 30 W,
62.5VA (resistive load)
Resistance
Measurement
2/4 Wire
Cold Junction
Compensation
Temperature Sensor Tmp235
Contact
Resistance
<1Ω at the end of contact life
Contact Life
>105 operations of rated load (resistive loads only)
>108 operations of cold switching
Relay Actuation
Time
<6ms
Isolation
between any two
channels
>1010Ω,<100pF
Input
Differential
Isolation
>1010Ω,<75pF
Connection
Screw Terminal
Operation
Environment
Ambient Temperature 0°C~40°C, Relative
Humidity<75%
(For full accuracy: 18°C ~28°C)
Temperature
Coefficient
<0.2 x applicable accuracy per degree (°C)
(for 0°C ~18°C and 28°C ~40°C)
Storage
Ambient Temperature -10°C ~70°C
Specifications
General
15
GDM-SC1A Scanner Card
Environment
Relative Humidity: 0°C ~35°C <75%, 35°C ~50°C <50%
Dimension
121(W) x 22(H) x 178(D) mm
Weight
260 grams
Note
Test conditions: Auto mode off, auto range off, in
simple mode with default delays.
The test items listed below may require proper delay
to obtain in-spec reading.
Function
Rate(readings/sec)
S M F DCV
5
7.5
11
DCI
5
7.5
11
ACV
0.3
0.4
0.4
ACI
0.3
0.4
0.4
2/4WΩ
(10M/100MΩ)
1.1
1.7
2.3
ACV+DCV
1.2
1.8
3.5
ACI+DCI
0.3
0.5
0.6
Diode
7.9
7.9
13
Note
Test conditions: Auto Range Off, Auto Zero/Gain
Off, ADC Speed: Quick, Count: 10, All Delays are set
to zero.
The test items listed below may still need proper
delay to obtain in-spec reading.
Function
Rate(readings/sec)
S M F Comments
DCV
4.35
16.4
29 ACV
0.3125
0.53
0.7
AC BW=3~300kHz
DCI
2.5 5 10 ACI
0.32
0.53
0.625
AC BW=3~300kHz
2/4 WR
4.31
16.4
30.5
Diode/Cont
11.23
18.5
23.35
GDM-8255A Reading rates (readings/sec)
GDM-8261/GDM-8261A Reading rates (readings/sec)
16
SCANNER CARD
Note
The signal being measured must be:
≥ 0.1V rms when its frequency is lower than
100kHz
≥1V rms when its frequency is lower than 600kHz
≥2.5V rms when its frequency is lower than
800kHz
Bandwidth of frequency measurement: 10Hz ~
800kHz
* Signal frequencies lower than 150Hz may need
proper delay to obtain in-spec reading.
Frequency
Rate(reading/sec)
Under 150Hz
1.1*
150Hz ~ 1.5kHz
1.8
1.5kHz ~ 15kHz
2.6
15kHz ~ 150kHz
4.5
Above 150kHz
12
Note
Test Conditions: Auto Range Off, Filter Off, Auto
Zero/Gain Off, Count: 10, All Delays are set to zero,
D-Shift: On
Bandwidth of Frequency Measurement:
3Hz~300kHz
Speed
Signal Level
Rate (Second/Reading)
Slow
100mV rms
2.62 Sec@3Hz
2.18 Sec@300kHz
Mid
100mV rms
552 mSec@20Hz
500 mS @300kHz
Fast
100mV rms
236 mSec@200Hz
200 mS @300kHz
Note
Test Conditions: Auto Range Off, Filter Off, Auto
Zero/Gain Off, Count: 10, All Delays are set to zero,
D-Shift: On
Bandwidth of Frequency Measurement:
3Hz~300kHz
Speed
Signal Level
Rate (Second/Reading)
Slow
100mV rms
2 Sec@3Hz
1.8 Sec@300kHz
Mid
100mV rms
552 mSec@20Hz
548 mS @300kHz
Fast
100mV rms
332 mSec@200Hz
332 mS @300kHz
GDM-8255A Reading rates-Frequency (readings/sec)
GDM-8261 Reading rates-Frequency
(seconds/reading)
GDM-8261A Reading rates-Frequency
(seconds/reading)
17
GDM-SC1A Scanner Card
Note
*: 250V is the maximum input voltage limitation of
GDM-SC1A Scanner card though it is in fact used in
the 1000.00V range.
Maximum Input: 250V DC or Peak on all ranges
Rate
Range
Accuracy
±(% of reading + digits)
Slow
100mV
0.015%+10
1V
0.015%+7
10V
0.015%+7
100V
0.015%+7
250V*
0.015%+7
Note
Maximum Input: 250V DC or 250Vrms AC
*: Ranges on which residual resistance needs to be
manually offset from readings when measuring.
Rate
Range
Accuracy
±(% of reading + digits)
Slow
100Ω
0.125%+10*
1kΩ
0.1%+7*
10kΩ
0.075%+7*
1000kΩ
0.075%+7
1MΩ
0.075%+7
10MΩ
0.375%+7
100MΩ
3.75%+10
Note
Maximum Input: 250V DC or 250Vrms AC
*: Ranges on which residual resistance needs to be
manually offset from readings when measuring.
Rate
Range
Accuracy
±(% of reading + digits)
Slow
100Ω
0.0625%+10*
1kΩ
0.0625%+7*
10kΩ
0.0625%+7*
100kΩ
0.0625%+7
1MΩ
0.0625%+7
10 MΩ
0.375%+7
100MΩ
3.75%+10
DC Voltage
2W Resistance
4W Resistance
18
SCANNER CARD
Note
Maximum Input: : 2A
When GDM-SC1A scanner card is used, 1A & 10A
ranges are protected with a 3A/125V fuse
Current ranges smaller than 1A are not selectable
when GDM-SC1A scanner card is used.
Rate
Range
Accuracy
±(% of reading + digits)
Slow
1 A
0.25%+7
Note
Maximum Input: AC 250V rms
The specifications are only applicable for sinusoidal
signals with amplitudes greater than 5% of the Full
Scale reading.
(*)Input <200V for 20~45Hz. 250V is the maximum
input voltage limitation of GDM-SC1A Scanner card
even though it is used in the 750.00V range.
Rate
Range
Accuracy (reading%+digits)
Slow
20~45Hz
45~10kHz
10k~30kHz
30k~100kHz
100mV
1.25%+125
0.25%+125
1.875%+375
6.25%+375
1V
1.25%+125
0.25%+125
1.25%+125
3.75%+250
10 V
1.25%+125
0.25%+125
1.25%+125
3.75%+250
100V
1.25%+125
0.25%+125
1.25%+125
3.75%+250
250V(*)
1.25%+125
0.25%+125
1.25%+125
3.75%+250
Note
Maximum Input: : 2A
The following specifications are only applicable for
sinusoidal signals with amplitude greater than 5% of the
Full Scale reading
1A & 10A ranges protected with a 3A/125V fuse
1A/10A range specifications are verified for < 5kHz
Rate
Range
20~50Hz
50Hz~ 10kHz
10kHz~ 20kHz
S
1A
--
1.25%+125
--
DC Current
AC Voltage
AC Current
19
GDM-SC1A Scanner Card
Note
Maximum Input: 250Vrms or 330V peak.
Rate
Sensitivity
10Hz~100kHz
100k~600kHz
600k~800kHz
Slow
2.5V
0.0625%+19
0.0625%+4
0.0625%+4
1V
0.0625%+19
0.0625%+4
--
0.1V
0.0625%+19
--
--
Note
Max. Input: 250V DC or 250 V rms AC
Diode
Range
Approx. 2V, (8255A)
Approx. 1.4V, (8261A)
Continuity
1 ~ 1000Ω
Note
The associated errors in temperature measurement
include temperature sensor (thermocouple), wire and
error measured by DMM and SCANNER CARD. In
temperature measurement, the largest source of error
is usually the temperature sensor (thermocouple) itself
Note
Sensor errors excluded from Temperature
specifications
Type
Measurement Range
Resolution
J, K, T
-200 ~ +300°C
0.01°C
AC Frequency
Diode/Continuity
Temperature
GDM-8255A Temperature Characteristics
20
SCANNER CARD
Note
(Display in °C, °F, Exclusive of probe errors.) RTD [1]
(Accuracy based on PT100):
(100Ω platinum [PT100], D100, F100,PT385, PT3916, or user type)
Range
Resolution
1 Year
(23°C ±5°C)
Temperature Coefficient
0°-18°C & 28°-55°C
-200°C~ -100°C
0.001°C
0.27°C
0.012 °C / °C
-100°C~-20°C
0.001°C
0.24°C
0.015 °C / °C
-20°C~20°C
0.001°C
0.18°C
0.015 °C / °C
20°C~100 °C
0.001°C
0.24°C
0.015 °C / °C
100°C~300 °C
0.001°C
0.36°C
0.021 °C / °C
300°C~600 °C
0.001°C
0.66°C
0.027 °C / °C
Thermocouples [2] (Accuracy based on ITS-90):
Type
Range
Resolution
90 Day/1 Year
(23°C±5°C)*
Temperature
Coefficient 0°-18°C &
28°-55°C
E
-200 to +1000°C
0.002 °C
0.6 °C
0.09 °C / °C
J
-210 to +1200°C
0.002 °C
0.6 °C
0.09 °C / °C
T
-200 to +400°C
0.002 °C
0.9 °C
0.12 °C / °C
K
-200 to +1372°C
0.002 °C
0.9 °C
0.12 °C / °C
N
-200 to +1300°C
0.003 °C
1.2 °C
0.15 °C / °C
R
-50 to +1768°C
0.01 °C
3 °C
0.42 °C / °C
S
-50 to +1768°C
0.01 °C
3 °C
0.42 °C / °C
B
+350 to +1820°C
0.01 °C
3 °C
0.42 °C / °C
*Relative to simulated junction
[1] The error of cold junction ±2°C is not included within the specifications.
[2] Specifications do not include probe accuracy
[3] All speeds need A-Zero=off, A-Gain=off, Fixed range and Trigger
Delay=0.
GDM-8261A Temperature Characteristics
21
GDM-SC1A Scanner Card
Basic work
Thermocouples consist of two spot-welded wires of
different metals or alloys. The thermoelectric effect at the
contact surface is used to measure temperatures. A
relatively small thermoelectric voltage is caused, which
depends on the temperature difference between the
measuring point and the connecting terminals. The
resulting voltage is a function of temperature. As the
temperature changes, the voltage changes. The
thermocouple voltage is equal to the temperature function
Reference
junctions
A reference junction is the cold junction in a
thermocouple circuit which is held at a stable, known
temperature. It is at the cold junction where dissimilar wire
connections must be made. As long as the temperature of
the cold junction is known, can factor in the reference
temperature to calculate the actual temperature reading at
the thermocouple.
standard
reference
temperature
The standard reference temperature is the ice point (0°C).
The ice point can be precisely controlled and the National
Bureau of Standards uses it as the fundamental reference
for its voltage-to-temperature conversion tables. However,
other known temperatures can be used.
HOW TO
THERMOCOUPLE
MEASUREMENT
22
HOW TO THERMOCOUPLE MEASUREMENT
Background
The GDM-SC1A incorporates a temperature sensor
(TMP235) in the box, which combines a direct
thermocouple measurement with a reference
junction compensation using a temperature IC to
effectively compensate the temperature for the cold
junction to calculate the actual temperature reading
of the thermocouple.
Scanner Card architecture
23
GDM-SC1A Scanner Card
Temperature Sensor
J10
J10 is preset to CH1, please switch J10 to
COLD COMPEN when cold junction
compensation.
It is recommended to start with CH2 when wiring.
J10
COLD
COMPEN
CH1
24
HOW TO THERMOCOUPLE MEASUREMENT
Background
This software is suitable for the GDM-SC1A scanner
card. This manual is to be used with all versions of
Excel from 2007 onwards with Windows PCs
(Windows XP, Windows 7/8/10: 32 bit or 64 bit).
Please note that Macros must be enabled for the
Add-In to function.
Installing the
USB driver
1. Connect the DMM to the PC using the supplied
USB.
2. The Windows Found New Hardware Wizard will
detect the DMM as a new device and ask for the
device driver.
Direct the Wizard to the USB_DRIVER directory
on the User Manual CD, or download the USB
driver from the GW Instek Website.
Installing the
Excel Add-In
1. On the User Manual CD, go to the Excel Add-in
subdirectory under the Software directory and
execute the Setup.exe file.
2. If the Microsoft User Account Control Shield
appears, allow the setup file to be executed.
3. Follow the InstallShield Wizard to install the SCAN
Card Excel Addin.
Installing the NI
VISA Run-Time
1. The NI VISA Run-Time must be installed to use the
Excel Add-in software. This is available on the NI
website,
http://www.ni.com/download/ni-visa-run-time-engi
ne-5.4/4231/en/.
2. Please follow the instructions on the NI website for
installation details.
Software
Installation
Up to three items need to be installed, the USB driver (not needed if
using the RS232 interface), the SCAN Card Excel Addin Software and
the NI VISA Run-Time.
25
GDM-SC1A Scanner Card
Run
1. Run DMM_SCAN_CARD software.
2. Enable office Excel macros.
3. The gain set will add a custom toolbar.
1. Press
DMM_SCAN _CAR D
About DMM SCAN CARD version information
(GDM-SC1A requires DMM SCAN Version 1.60 or
higher to provide COLD Junction function)
2. Press Connect
1. Show Connect UI
SCAN operation
26
HOW TO THERMOCOUPLE MEASUREMENT
2.Press Auto Search to automatically find connected
devices
ASRL7:INSTR 115200,N,8,1 model GWInstek,
GDM8261A, GEO905513,1.03
3. Click COM Port select, press Connect to connect the
device, press Disconnect to disconnect the device.
If the display is green, the connection is successful.
27
GDM-SC1A Scanner Card
3. Press SETUP
1. Set measurement channel, Function, Range, Hi limit,
Low limit, etc.
2. Cursor moved to ON/OFF □101 , Press □
˅
101
Cursor moved to Function, Press ▼
Select COLD Junction (Switch jumper 10 from
CH1 to COLD Junction from Scanner Card).
3. Cursor moved to Range, Press ▼
GDM-SC1A use TMP235
Set Hi / Low limit.
28
HOW TO THERMOCOUPLE MEASUREMENT
Note
When both Master and Slave scanner cards are
being utilized by 8255A simultaneously, it is
demanded to set CH1 as cold junction for both
CH101 & CH201, and to initiate from CH2 for both
CH102 & CH202 in terms of channels.
4. Set tick to measure other channels, and set the
channel Function, Range, Hi limit, Low limit
Low limit.
5. Set TC Type (Type K, Type J, Type T)
29
GDM-SC1A Scanner Card
6. Set scan conditions
Continue When the LoopCyde function is checked,
the number of scans can be set.
7. EXIT end setting
4. Press TRIG
Run scan
Note: The first pen is uncompensated when first
executed, and the cold offset value is calculated after
the second pen.
When CH1 is not set as cold junction, the CHs of
the other channels remain the original simulation
temperature without any alteration.
30
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