Signametrics
42
electing the appropriate external resistor is very important. It sets the accuracy and range of the synthesized value.
ich sets the value of the
ld
e an
eselecting the function, or resetting the value has the effect of restarting the synthesis
rocess. This will speed up the acquisition time when condition change.
S
Functions associated with the synthesis of resistance include
DMMSetExternalShunt()
, wh
external shunt, and
DMMSetResistance()
, which control the value to be synthesized. The external resistor shou
be 100
Ω
to 10M
Ω
. Set the measurement to 10 or higher. 20rps is optimal. The Closed loop flag does not hav
effect on this function. R
p
Figure 4-17. Synthesizing resistance into a voltage divider circuit.
Figure 4-18. Synthesizing resistance into a current source.
4.15 Interfacing to the SMX4032 series Relay Scanners
The SMX2040 series of Digital Multimeters are designed to interface to the SM4000 series relay scanners. The
following section describes both, the hardware interface and the software functions required to implement a
synchronized operation.
4.15.1 Triggering the SMX2040 DMMs
The SMX2040 series can accept a hardware trigger from many sources, including the SM4000 scanners. The latter
can be setup to trigger a measurement any time the scanner selects a new channel. The interface requires a single
0 +5V and
TRIG_out to the SMX2040 Trigger inputs. The various SMX4032 auto scanning operations can run independently
jumper between the SM4000
Trig_com
and
Common
lines, and a connection between the SM400
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
