Measurement-computing LGR-5320 Series Manuel d'utilisateur télécharger pdf (Page 29)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter Condition Specification

A/D converter 16-bit successive approximation type

Input ranges Software selectable per channel LGR-5327/5329: ±30 V, ±10 V, ±5 V, ±1 V

LGR-5325: ±10 V, ±5 V, ±1 V

Number of channels 8 differential (DIFF)/16 single-ended (SE),

software-selectable

Input configuration Multiplexed

Absolute maximum input voltage CHx_x to AGND LGR-5327/5329: ±38 V max(power on and

power off)

LGR-5325: ±25 V max(power on and power

off)

Input impedance ±30 V range

(LGR-5327/5329 only)

1 MΩ (power on),

1 GΩ (power off)

±10 V, ±5 V, ±1 V range 10 GΩ (power on)

1 GΩ (power off)

Input leakage current ±100 pA

Input capacitance ±30 V range (LGR-5327/5329) 90 pf (Note 2)

±10 V, ±5 V, ±1 V range 55 pf

Maximum working voltage

(signal+ common mode)

±30 V range ±30.05 V

±10 V, ±5 V, ±1 V range ±10.2 V

Common mode rejection ratio fin = 60 Hz, ±30 V range 65 dB min

fin = 60 Hz, all other ranges 75 dB min

Crosstalk DC to 25 kHz, adjacent DIFF

mode channels

–80 dB

ADC resolution 16 bits

Input bandwidth (–3 dB) All input ranges 450 kHz min

Input coupling DC

Maximum sample rate LGR-5327/5329: 200 kS/s

LGR-5325: 100 kS/s

A/D pacing sources See Input sequencer section

Warm up time 30 minutes, min

Absolute accuracy All ranges 0.07% FSR

Noise DIFF mode 2 LSB rms

Note 1: Unused analog input channels can either be left floating or tied to an AGND pin.

Note 2: When using the ±30 V input range, keep source impedance and source capacitance as small as possible

to minimize settling time, gain, and bandwidth errors.

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