Measurement-computing USB-7204 Instrukcja Użytkownika Pobierz pdf (Strona 23)

USB-7204 User's Guide Specifications

Table 6. Noise performance, differential mode

Range Typical counts Least significant bit

root mean square

(LSB

rms)

±20 V 2 0.30

±10 V 2 0.30

±5 V 3 0.45

±4 V 3 0.45

±2.5 V 4 0.61

±2 V 5 0.76

±1.25 V 7 1.06

±1 V 8 1.21

Table 7. Noise performance, single-ended mode

Range Typical

Counts

LSB

rms

±10 V 2 0.30

Analog output

Table 8. Analog output specifications

Parameter Conditions Specification

Resolution

12-bits, 1 in 4096

Output range

0 – 4.096 V, 1 mV per LSB.

Number of channels

Throughput (Note 5) Software paced 250 S/s single channel typ, system dependent

Single channel, continuous scan 10 kS/s

Dual channel, continuous scan, simultaneous

update

5 kS/s

Power on and reset

voltage

Initializes to 000h code

Output drive Each D/A OUT 15 mA

Slew rate

0.8V/microsecond (µs) typ

Note 5: Maximum throughput scanning to computer memory is machine dependent. The rates specified are for

Windows XP only. Maximum rates on operating systems that predate XP may be less and must be

determined through testing on your machine.

Table 9. Analog output accuracy, all values are (±)

Range Accuracy (LSB)

0 V to 4.096 V 4.0 typ, 45.0 max

Table 10. Analog output accuracy components, all values are (±)

Range % of FSR Gain Error at FS (mV) Offset (mV)

(Note 6)

Accuracy at FS

(mV)

0 V to 4.096 V 0.1 typ, 0.9 max 4.0 typ, 36.0 max 1.0 typ, 9.0 max 4.0 typ, 45.0 max

Note 6: Negative offsets will result in a fixed zero-scale error or "dead band." At the max offset of 9 mV, any

input code of less than 0x009 will not produce a response in the output.

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