Section 3: Operation
Model 2001-TCSCAN Scanner Card User's Manual
3-14
2001-TCSCAN-900-01 Rev. A / April 2018
Use the SCPI commands below to set up a combination 2- and 4-wire resistance test using the
DMM6500 and your 2001-TCSCAN.
*RST
Puts the DMM in a known state
FUNC 'FRES', (@2)
Sets the channels for 4-wire measurements
FRES:OCOM ON, (@2)
Turns on offset compensation
FRES:RANG 100, (@2)
Sets the 4-
wire range to 100 Ω
FUNC 'RES', (@3, 4, 6, 8:9)
Sets the channels to 2-wire measurement
RES:RANG 100e3, (@3, 4, 6, 8:9)
Sets the 2-
wire range to 100 kΩ
ROUT:SCAN:CRE (@2:4, 6, 8:9)
Creates the scan
TRAC:CLE
Clears the buffer
INIT
Initiates the scan
Below are equivalent TSP commands to set a combination 2- and 4-wire resistance test using the
DMM6500 and your 2001-TCSCAN.
reset()
Puts the DMM in a known state
channel.setdmm("2", dmm.ATTR_MEAS_FUNCTION,
dmm.FUNC_4W_RESISTANCE)
Sets the channels for 4-wire
measurements
channel.setdmm("2", dmm.ATTR_MEAS_OFFCOMP_ENABLE,
dmm.OCOMP_ON)
Turns on offset compensation
channel.setdmm("2", dmm.ATTR_MEAS_RANGE, 100)
Sets the 4-wire range to 100
Ω
channel.setdmm("3, 4, 6, 8, 9",
dmm.ATTR_MEAS_FUNCTION, dmm.FUNC_RESISTANCE)
Sets the channels to 2-wire
measurement
hannel.setdmm("3,4,6,8,9", dmm.ATTR_MEAS_RANGE,
100e3)
Sets the 2-wire range to 100
kΩ
scan.create("2:4,6,8:9")
Creates the scan
defbuffer1.clear()
Clears the buffer
trigger.model.initiate()
Initiates the scan
Measurement considerations
Thermocouple measurement error sources
The temperature measurement accuracy specification of the 2001-TCSCAN is the sum of the
following error sources:
•
Reference junction sensor error
•
Temperature gradient across the card
•
Relay offset voltage
•
DMM measurement accuracy
•
DMM temperature conversion algorithm
You can improve card performance by understanding how these error sources contribute to the
specification.