XT2640 Operating Manual
13 July 2016
Page 20 of 187
9
WIRING
TO
CHANNELS
This section shows typical wiring to each channel in each VPA matching the configuration WIRING setting for that VPA in the XT2640
MEAS CONFIG menu.
9.1
1Ø
WIRING
USING
INTERNAL
CURRENT
MEASUREMENT
CAUTION:
FOR
USE
WITH
SH,
SD,
AH,
AD,
LH,
LD,
WH
OR
WD
CHANNELS
ONLY
DO
NOT
CONNECT
WIRING
WHILE
VOLTAGE
PRESENT.
ENSURE
WIRING
IS
CORRECT
BEFORE
APPLYING
VOLTAGE.
DO
NOT
PASS
LOAD
CURRENT
>2Arms
WITH
THE
XT2640
TURNED
OFF.
WIRING:
Thicker connections are current carrying. Ensure wire used is rated for the maximum voltage and current to be
encountered.
Thinner connections are not current carrying. Ensure wire used is rated for the maximum voltage to be encountered.
The wiring connections shown above ensure the best overall system accuracy in most circumstances, measuring the
voltage at the source and the load current. For applications requiring accurate measurements of the power to the load
when using low voltages (<50V) and high currents (>1A) change the RED V+ terminal connection to that of the BLUE A‐
terminal instead of the YELLOW A+ terminal shown above, this ensures that the voltage drop across the A terminal does
not affect the V measurement, at the expense of the current and power measurements including the current and power
drawn by the V input (which may be adjusted for by using the ADJUST setting in the MEAS CONFIG screen).
XT2640 CONFIGURATION:
In the XT2640 MEAS CONFIG menu you should set SCALE for the channel to OFF.
For either connection method you may use the ADJUST setting in the MEAS CONFIG menu to set the XT2640 to adjust the
signals for the connection method and whether source or load results are required.
A
V
L or
HI
N or
LO
L or
HI
N or
LO
From
SOURCE
To
LOAD
XT2640
CH
