L-Card L-502-P-G-D-I, Руководство пользователя

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49
Chapter 5. Specifications.
The following specifications indicate the main parameters of the L-502 for its intended -
operating mode.
!
For the maximum permissible voltages and currents at the contacts of the connectors,
see section
4.3
, on p.
42
5.1. ADC.
Parameter Value
Number of channels 16 differential or
32 with common ground (single-phase)
DC Voltage Measurement Range
Voltage measurement subranges
(the input signal is applied between Xi and Yi for 16-channel
mode, between Xi (Yi) and GND32 for 32-channel mode)
±10 V
±10 V, ±5 V, ±2 V, ±1 V, ±0.5 V, ±0.2
V when
observing the operating
conditions of the measurement (see
below)
Operating conditions of measurement at the ADC inputs (s.
4.4
,
p.
44
) :
- Voltages at the input Yi with regard to AGND for the
differential measurement mode on the subbands "± 10 V", "± 5
V"
- The average value of the voltage at the inputs X and Y for the
differential mode on the measurement subranges "± 2 V", "± 1
V", "± 0.5 V", "± 0.2 V"
- Voltages at the GND32 input relative to AGND for the
"common ground" mode and all measurement subbands
|U
X
|
≤ ±1 V
| (U
X
+ U
Y
)/2 | ≤ ±1 V
|U
GND32
| ≤ ±1 V
Analog-to-digital converter bit depth 16 bits
ADC data width after arithmetic processing (data correction, data
averaging) 24 bits
Limits of the permissible reduced basic error of DC voltage
measurements, %, in subbands:
– 10; 5 and 2 V ±0.05
– 1 V ±0.07
– 0.5 V ±0.1
– 0.2 V ±0.2
Own input current (via X, Y or GND32 circuits) in single-channel
mode, no more than 0.4 µA
Charge injection into the input circuit of the ADC (X, Y or
GND32) for one switching 2 pC
Possibility of data correction (use of calibration coefficients) Yes