Measurement-computing USB-7204 Manual de usuario descargar pdf (Pagina 22)

USB-7204 User's Guide Specifications

Note 1: Input current is a function of applied voltage on the analog input channels. For a given input

voltage, V

, the input leakage is approximately equal to (8.181*V

–12) µA.

Note 2: Maximum throughput scanning to computer memory is machine dependent. The rates specified are for

Windows XP only.

Note 3: The AD7870 converter only returns 11-bits (0-2047 codes) in single-ended mode and 12-bits in

differential mode. Firmware versions prior to 2.04 have LSB justified data. Firmware versions from

2.04 on have MSB justified data.

Note 4: External Gated Sync holds off the first clock pulse after setting up a scan to ensure adequate setup time

for the first conversion.

Table 2. Accuracy, differential mode

Range Accuracy (LSB)

±20 V 5.1

±10 V 6.1

±5 V 8.1

±4 V 9.1

±2.5 V 12.1

±2 V 14.1

±1.25 V 20.1

±1 V 24.1

Table 3. Accuracy, single-ended mode

Range Accuracy (LSB)

±10 V 4.0

Table 4. Accuracy components, differential mode - All values are (±)

Range % of Reading Gain Error at full scale (FS)

(millivolts (mV))

Offset (mV) Accuracy at FS (mV)

±20 V 0.2 40 9.766 49.766

±10 V 0.2 20 9.766 29.766

±5 V 0.2 10 9.766 19.766

±4 V 0.2 8 9.766 17.766

±2.5 V 0.2 5 9.766 14.766

±2 V 0.2 4 9.766 13.766

±1.25 V 0.2 2.5 9.766 12.266

±1 V 0.2 2 9.766 11.766

Table 5. Accuracy components, single-ended mode - All values are (±)

Range % of Reading Gain Error at FS (mV) Offset (mV) Accuracy at FS (mV)

±10 V 0.2 20 19.531 39.531

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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