Section 6: Model 3750 Additional Information
Series 3700 System Switch/Multimeter User's Manual
6-16
3700S-900-01 Rev. C / July 2008
Desired effect
P3 pin
numbers
Connect VEXT1 to VEXT2
Jumper 17 - 18
For backplane configuration at J5, jumper pins 2-3 to allow the Model 3750 to
make backplane connections during calibration with a system DMM. If you do
not want to ever physically allow the Model 3750 to make backplane
connections, jumper pins 1-2. By populating this jumper in this way, an
additional amount of safety is provided to a system that may have high voltage
connections made to the backplane.
Calibration
To maintain specified performance over time, the analog output channels and
the counter channels might need to be calibrated. The Model 3750 supports
automatic in-system calibration if a DMM is present. Otherwise, an external
DMM of 6.5 digits of accuracy or better can be used.
NOTE
When performing a user calibration, final accuracy is determined by
the standards used. Always verify the calibration results with a
calibrated instrument capable of making measurements that exceed
the specifications of the Model 3750.
We recommend that the Model 3750 is calibrated in the end application
whenever possible so that the thermal and electrical operating environments can
be accounted for. Best results will be obtained whenever this can be done and
up to 8x improvements in offsets are typical.
