Справочник Пользователя для National Instruments NI 9144

Each channel has open loop detection circuitry that reports an error 
whenever the load is disconnected and the current is set to a value higher 
than 0 mA.

The NI 9265 has four channels with a nominal range of 0 to 20.675 mA. 
Each channel has an associated LSB weight, which is the number of volts 
per bit, and an offset, which is the number of volts per bit measured when 
the inputs are grounded.

LSB weight is referred to as Gain in the object dictionary.

The calibration data is stored in a U32 array, though each Offset field 
(subindex 1, 3, 5, and so on) should be interpreted as a signed value.

Table 60.  NI 9265 Vendor Configuration Extensions

0x2002

1

ARR:U32

R

Error Status, 
sent as 8-bit PDO

0x2100

0

ARR:U32

—

Calibration = 16

1

R

Ch0 Offset

2

R

Ch0 Gain

3

R

Ch1 Offset

...

—

8

R

Ch3 Gain

9

R

External Ch0 
Offset

...

—

Table 61.  NI 9265 Scan List Format

LSB Weight

Unsigned

pA/LSB

Offset

Signed

pA