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LGR-5320 Series User's Guide Functional Details

Analog input SE and DIFF channel configurations

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 8–11

CH0L = channel 8 SE

CH1L = channel 9 SE

CH2L = channel 10 SE

CH3L = channel 11 SE

Single-ended analog channels 4–7

CH4H = channel 4 SE

CH5H = channel 5 SE

CH6H = channel 6 SE

CH7H=channel 7 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 0–3

CH0H /CH0L through CH3H /CH3L

Differential analog channels 4–7

CH4H /CH4L through CH7H /CH7L

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

AGND pin.

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

AGND and GND terminals are tied together internally. These grounds are electrically

isolated from the

EGND (earth ground) terminal block pin.

 On the LGR-5327, the

AGND, ENC, and GND terminals are tied together internally. These grounds are

electrically isolated from the

EGND terminal block pin.

 On the LGR-5329, the

AGND, ENC, and GND terminals are tied together internally. These grounds are

electrically isolated from the

EGND and the IGND (isolated ground) terminal block pins.

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

TRIG/EVENT button.

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

DTRIG terminal.

When using digital triggering, the TTL trigger signal on the

DTRIG connector is for a trigger condition. When

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.

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Measurement-computing LGR-5320 Series Manuale Utente Pagina 16

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