84
Working with Triggers and Downloading Event Records
U
sr
(
n
)
is the present value of the sliding reference voltage;
U
sr
(
n
−
1)
is the previous value of the sliding reference voltage; and
U
(10
/
12)
is the most recent 10/12-cycle r.m.s. value.
Note that even though the specification defines the input signal (U) as a voltage, Arbiter
Systems has applied the specification to include measured input currents as calculated using the
same formula.
8.4
Triggering from External Events
The Model 1133A has four event input connectors on the rear panel. Trigger from any or all of
the external event inputs by connecting signals to any one of the four event input connectors on
the rear panel, and configuring the 1133A by through PSCSV. This section covers how to configure
these specific inputs for event triggering. Additionally, before connecting any input signals to these
connectors, please review the event input specifications in Figure 2.8, Section 12.8.4 and Event
Input Settings in Chapter 14.
Each of the event input ports is identical and waits for a voltage level shift of 24 to 240 Vdc, or
5 Vdc by modification. When the voltage changes, the 1133A records the event in flash memory,
records specific signal data at the time of the event, and may also notify you from either serial port
or Ethernet port.
To configure, make sure that the 1133A is powered on and that you have an open connection
between your computer and the 1133A. Also, make sure that you are logged on with permission to
configure.
1. Select Connection
>
Configure
>
Trigger Parameters, or click the Configure Trigger
Parameters button.
2. Select Data Logged on the left panel of the Configure Triggers window and click the System
Triggers button near the bottom of the window (see Figure 8.4).
Figure 8.4: Configure External Event Inputs Screen
3. Select External Event Input1, 2, 3 or 4 making sure that the appropriate boxes are checked.
