Trigger Input - Measurement Computing LGR-5320 Series User Manual

LGR-5320 Series User's Guide
Single-ended analog channels 0–3
CH0H = channel 0 SE
CH1H = channel 1 SE
CH2H = channel 2 SE
CH3H= channel 3 SE
Single-ended analog channels 4–7
CH4H = channel 4 SE
CH5H = channel 5 SE
CH6H = channel 6 SE
CH7H=channel 7 SE
Differential analog channels 0–3
CH0H /CH0L through CH3H /CH3L
You can configure all LGR-5320 Series analog input channels for voltage input ranges of ±10 V, ±5 V, or ±1 V.
The LGR-5327 and LGR-5329 also support a ±30 V voltage input range.
Unused analog input channels can either be left floating or connected to an
When using the ±30 V input range with the LGR-5327 and LGR-5329, keep source impedance and source
capacitance as small as possible to minimize settling time, gain, and bandwidth errors.
When connecting differential inputs to floating voltage sources in the ±10 V, ±5 V, ±1 V ranges, the user must
provide a DC return path from the low channel (CHxL) connector of each differential input to ground. To do
this, simply connect a resistor from the CHxL connector of the differential inputs to AGND. A value of
approximately 100 kΩ can be used for most applications.

On the LGR-5325, the
isolated from the

On the LGR-5327, the
electrically isolated from the

On the LGR-5329, the
electrically isolated from the

Trigger input

The LGR-5320 Series supports the following trigger modes to accommodate certain measurement situations.

External digital trigger

External analog trigger (single-channel)

Digital pattern trigger
The LGR-5327 and LGR-5329 also support multichannel analog trigger mode.
To manually trigger an acquisition, press the
Digital and analog triggers connected
The input of the digital trigger and the output of the single-channel analog signal comparator are connected
directly to hardware circuits to provide low-latency triggering. Latencies should be low (around 1.5 µs).
External digital trigger
A digital (or TTL-level) trigger starts an acquisition when the trigger condition is met at the
When using digital triggering, the TTL trigger signal on the
the selected condition occurs, it is the trigger event.
If the LGR-5320 Series device is ready for a trigger, then the trigger event occurs.
Analog input SE and DIFF channel configurations
and terminals are tied together internally. These grounds are electrically
AGND GND
(earth ground) terminal block pin.
EGND
and
AGND, ENC, GND
EGND terminal block pin.
AGND, ENC, and GND
EGND and the
TRIG/EVENT
Single-ended analog channels 8–11
CH0L = channel 8 SE
CH1L = channel 9 SE
CH2L = channel 10 SE
CH3L = channel 11 SE
Single-ended analog channels 12–15
CH4L = channel 12 SE
CH5L = channel 13 SE
CH6L = channel 14 SE
CH7L = channel 15 SE
Differential analog channels 4–7
CH4H /CH4L through CH7H /CH7L
terminals are tied together internally. These grounds are
terminals are tied together internally. These grounds are
IGND (isolated ground) terminal block pins.
button.
DTRIG connector is for a trigger condition. When
16
Functional Details
pin.
AGND
terminal.
DTRIG