Series 3700 System Switch/Multimeter User's Manual
Section 6: Model 3750 Additional Information
3700S-900-01 Rev. C / July 2008
6-7
Counter/totalizer
CAUTION
Do not exceed the maximum voltage and currents as listed on
the Model 3750 specifications. Unused inputs should not be left
floating but should be tied to ground or an appropriate DC
voltage.
There are four separate totalizer channels, numbered 6 through 9, on a Model
3750 card. The threshold voltage is programmable and can be either 0 V or a
TTL level (1.5 V). Counting occurs when the rising or falling edge on the input
signal passes through the defined threshold. The edge to be counted can be
programmed to be either rising or falling. The power on default is rising edge,
TTL level threshold.
NOTE
When setting up the edge to be detected or changing the threshold,
any existing counts are cleared.
Using the card to count closures
The following examples demonstrate how to use the card to count closures of a
door switch connected to the first totalizer in Slot 1, using the Channel 1005.
Figure 6-3: Switch count example