65
6.1.7. Connecting a power supply to the ADC input
6.1.7.1. Mode "with common ground"
6.1.7.2. Differential mode
R
I
L-502
AGND
GND32
X1 (X2-X16, Y1-Y16)
Y1 (X2-X16)
R
I
L-502
AGND
X1 (Y2 -Y16)
Fixed ADC ± U subband must correspond to U=I
MAX
*R, and the current source must have a voltage
margin of at least U. Resistor R should always be located close to the ADC input. In any case, the resistor
R must be less than 50 Ω in the multi
-channel mode at the maximum switching frequency.
6.1.7.3. Differential mode, offset potential
due to current source in regard to AGND
6.1.7.4. Differential mode, isolated
current source
Y1 (X2-X16)
R
I
L-502
AGND
X1 (Y2 -Y16)
U
см
R1
L-502
AGND
X1 (X2 -X16)
Y1 (Y2 -Y16)
R2
I
R = R1 + R2
Only for the voltage subbands L-502:
±2 V, ±1
V, ±0.5 V, ±0.2 V
Fixed ADC ± U measurement subband must correspond to U=I
MAX
*R, while the current source
must have a voltage margin of, at least, U. Resistor R should always be located close to the ADC input.
Resistor
s R, R1, R2 must be less than 50 Ω in multichannel mode at the maximum switching frequency.
|Ucm| ≤ 1 В