910-269-EN, Rev. B, June 2011
130 Chapter 8
Matching the impedance of the output from the EPOCH 1000 Series with the
impedance of the input to the peripheral device allows the EPOCH 1000 Series to
properly offset the analog output to produce predictable output voltages based
on screen measurements. For example, a measurement on the EPOCH 1000 Series
of 10 mm on a 100 mm screen range, with an analog output range of 0-10 V,
should produce an analog output of 1 V. Without impedance matching, the value
can be skewed above or below the expected 1 V output value (0.95 V or 1.02 V,
etc).
8.3
Trigger Input and Output
The EPOCH 1000 Series offers trigger syncing capabilities to allow the instrument to
be used in conjunction with other devices/instruments in a system. This triggering
capability governs the timing of each instrument pulse based on the selected method
and, where applicable, external input. The EPOCH 1000 Series trigger input and
output signals are accessed via the 26-pin A
LARMS
D-sub connector on the back of the
instrument (see section 1.4.3 on page 31). Refer to Table 32 on page 316 for the
A
LARMS
connector pinout.
The trigger input and output mode is set using the
3/5 > Meas Setup
>
Trigger
parameter that offers three selections:
Internal
Standard operational mode internally controlling the pulse timing and frequency.
The EPOCH 1000 Series is not affected by the external trigger input but outputs a
synchronization pulse, allowing to trigger other devices at the same rate and
timing as it is sending a pulse to the connected transducer(s).
External
This selection allows an external device to control the pulse timing and frequency
of the EPOCH 1000 Series via the
EXT TRIG IN
pin on the 26-pin A
LARMS
D-sub
connector. When no external input pulse is provided, the instrument does not
send any pulse to the connected transducer(s) and appears frozen.
Single
This selection allows the instrument pulse timing and frequency to be manually
controlled by you or via computer commands. When in
Single
mode, the
instrument does not send a pulse to the connected transducer(s) until
[CHECK]
is
pressed (directly or via RS-232 or USB). If
[CHECK]
is not pressed, the instrument
appears frozen.
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Summary of Contents for EPOCH 1000 Series
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