NI的便携式可编程测量设备

内容介绍

myDAQ大学版套件是一款便携式测量和仪器控制学生设备，可让学生在实验室内外均可随时动手做实验。它包含八个基于计算机的常用实验仪器，包括数字万用表(DMM)、示波器和函数发生器，这些仪器基于LabVIEW软件进行开发，可即插即用。您可以访问所有可立即运行的软件仪器，使用波特分析仪、任意波形发生器、动态信号分析仪（支持快速傅立叶变换）、数字输入和数字输出来进行实验和练习。

相关教学资源：NI教学资源

产品规格：

模拟输入：

Number of channels	2 differential or 1 stereo audio input
ADC resolution	16 bits
Maximum sampling rate	200 kS/s
Timing accuracy	100 ppm of sample rate
Timing resolution	10 ns



Input type (audio input)	Line-in or microphone
Microphone excitation (audio input)	5.25 V through 10 kΩ

Range
Analog input	±10 V, ±2 V, DC-coupled
Audio input	±2 V, AC-coupled

Passband (-3 dB)
Analog input	DC to 400 kHz
Audio input	1.5 Hz to 400 kHz

Connector type
Analog input	Screw terminals
Audio input	3.5 mm stereo jack

表1. 绝对精确

Nominal Range		Typical at 23 °C (mV)	Maximum (18 to 28 °C) (mV)
Positive Full Scale	Negative Full Scale
10	-10	22.8	38.9
2	-2	4.9	8.6

Figure 1. Settling Time (10 V Range) versus Different Source Impedance

Figure 2. Settling Time (2 V Range) versus Different Source Impedance

Input FIFO size	4,095 samples, shared among channels used
Maximum working voltage for analog inputs (signal + common mode)	±10.5 V to AGND
Common-mode rejection ratio (CMRR) (DC to 60 Hz)	70 dB

Anti-aliasing filter	None

Input impedance

Device on
AI+ or AI- to AGND	>10 GΩ \|\| 100 pF
AI+ to AI-	>10 GΩ \|\| 100 pF

Device off
AI+ or AI- to AGND	5 kΩ
AI+ to AI-	10 kΩ

Overvoltage protection
AI+ or AI- to AGND	±16 V
Audio input left and right	None

模拟输出：

Number of channels	2 ground-referenced or 1 stereo audio output
DAC resolution	16 bits
Maximum update rate	200 kS/s

Range
Analog output	±10 V, ±2 V, DC-coupled
Audio output	±2 V, AC-coupled

Maximum output current (analog output)	2 mA

Minimum load impedance (audio output)	8 Ω

AC-coupling high-pass frequency (audio output with 32 Ω load)	48 Hz

Output impedance
Analog output	1 Ω
Audio output	120 Ω

Connector type
Analog output	Screw terminals
Audio output	3.5 mm stereo jack

Table 2. Absolute accuracy

Nominal Range		Typical at 23 °C (mV)	Maximum (18 to 28 °C) (mV)
Positive Full Scale	Negative Full Scale
10	-10	19.6	42.8
2	-2	5.4	8.8

Slew rate	4 V/μs
Timing accuracy	100 ppm of sample rate
Timing resolution	10 ns
Overdrive protection	±16 V to AGND
Maximum power-on voltage	±110 mV
Output FIFO size	8,191 samples, shared among channels used

数字 I/O

Number of lines	8; DIO <0..7>
Direction control	Each line individually programmable as input or output
Update mode	Software-timed
Pull-down resistor	75 kΩ
Logic level	5 V compatible LVTTL input; 3.3 V LVTTL output
VIH min	2.0 V
VIL max	0.8 V
Maximum output current per line	4 mA

General Purpose Counter/Timer

Number of counter/timers	1
Resolution	32 bits
Internal base clocks	100 MHz
Base clock accuracy	100 ppm
Maximum counting and pulse generation update rate	1 MS/s

Data transfers	Programmed I/O
Update mode	Software-timed

Default routing
CTR 0 SOURCE	PFI 0 routed through DIO 0
CTR 0 GATE	PFI 1 routed through DIO 1
CTR 0 AUX	PFI 2 routed through DIO 2
CTR 0 OUT	PFI 3 routed through DIO 3
FREQ OUT	PFI 4 routed through DIO 4

Digital Multimeter

Functions	DC voltage, AC voltage, DC current, AC current, resistance, diode, continuity
Isolation level	60 VDC/20 Vrms, Measurement Category I
Connectivity	Banana jacks
Resolution	3.5 digits
Input coupling	DC (DC Voltage, DC Current, Resistance, Diode, Continuity); AC (AC Voltage, AC Current)

Voltage Measurement

DC ranges	200 mV, 2 V, 20 V, 60 V
AC ranges	200 mVrms, 2 Vrms, 20 Vrms

Note

All AC voltage accuracy specifications apply to signal amplitudes greater than 5% of range.

Table 3. Accuracy, DC Voltage Function

Range	Resolution	Accuracy
		± ([% of Reading] + Offset)
200.0 mV	0.1 mV	0.5% + 0.2 mV
2.000 V	0.001 V	0.5% + 2 mV
20.00 V	0.01 V	0.5% + 20 mV
60.0 V	0.1 V	0.5% + 200 mV

Table 4. Accuracy, AC Voltage Function

Range	Resolution	Accuracy
		± ([% of Reading] + Offset)
		40 to 400 Hz	400 to 2,000 Hz
200.0 mV	0.1 mV	1.4% + 0.6 mV	-
2.000 V	0.001 V	1.4% + 0.005 V	5.4% + 0.005 V
20.00 V	0.01 V	1.5% + 0.05 V	5.5% + 0.05 V

Input impedance

10 MΩ

Current Measurement

DC ranges	20 mA, 200 mA, 1 A
AC ranges	20 mArms, 200 mArms, 1 Arms

Note

All AC accuracy specifications within 20 mA and 200 mA ranges apply to signal amplitudes greater than 5% of range. All AC accuracy specifications within the 1 A range apply to signal amplitudes greater than 10% of range.

Table 5. Accuracy, DC Current Function

Range	Resolution	Accuracy
		± ([% of Reading] + Offset)
20.00 mA	0.01 mA	0.5% + 0.03 mA
200.0 mA	0.1 mA	0.5% + 0.3 mA
1.000 A	0.001 A	0.5% + 3 mA

Table 6. Accuracy, AC Current Function

Range	Resolution	Accuracy
		± ([% of Reading] + Offset)
		40 to 400 Hz	400 to 2,000 Hz
20.00 mA	0.01 mA	1.4% + 0.06 mA	5% + 0.06 mA
200.0 mA	0.1 mA	1.5% + 0.8 mA	5% + 0.8 mA
1.000 A	0.001 A	1.6% + 6 mA	5% + 6 mA

Input protection

Internal ceramic fuse, 1.25 A 250 V, fast-acting, 5 × 20 mm, F 1.25A H 250V (Littelfuse part number 02161.25)

Resistance Measurement

Ranges

200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 2 MΩ, 20 MΩ

Table 7. Accuracy, Resistance (Ω) Function

Range	Resolution	Accuracy
		± ([% of Reading] + Offset)
200.0 Ω	0.1 Ω	0.8% + 0.3 Ω
2.000 kΩ	0.001 kΩ	0.8% + 3 Ω
20.00 kΩ	0.01 kΩ	0.8% + 30 Ω
200.0 kΩ	0.1 kΩ	0.8% + 300 Ω
2.000 MΩ	0.001 MΩ	0.8% + 3 kΩ
20.00 MΩ	0.01 MΩ	1.5% + 50 kΩ

Diode Measurement

Range

2 V

Power Supplies

Caution

Do not mix power from NI myDAQ with power from external power sources. When using external power, remove any connections to the power supply terminals on NI myDAQ.

+15V Supply


Maximum output current	32 mA
Maximum load capacitance	470 μF

Output voltage
Typical (no load)	15.0 V
Maximum voltage (no load)	15.3 V
Minimum voltage (full load)	14.0

-15V Supply


Maximum output current	32 mA
Maximum load capacitance	470 μF

Output voltage
Typical (no load)	-15.0 V
Maximum voltage (no load)	-15.3 V
Minimum voltage (full load)	-14.0

+5V Supply


Maximum output current	100 mA
Maximum load capacitance	33 μF

Output voltage
Typical (no load)	4.9 V
Maximum voltage (no load)	5.2 V
Minimum voltage (full load)	4.0

Calculating Power Consumption

The total power available for the power supplies, analog outputs, and digital outputs is limited to 500 mW (typical)/100 mW (minimum). To calculate the total power consumption of the power supplies, multiply the output voltage by the load current for each voltage rail and sum them together. For digital output power consumption, multiply 3.3 V by the load current. For analog output power consumption, multiply 15 V by the load current. Using audio output subtracts 100 mW from the total power budget.

If you use 50 mA on +5 V, 2 mA on +15 V, 1 mA on -15 V, use four DIO lines to drive LEDs at 3 mA each, and have a 1 mA load on each AO channel, the total output power consumption is 364.6 mW

5 V × 50 mA = 250 mW
|+15 V| × 2 mA = 30 mW
|-15 V| × 1 mA = 15 mW
3.3 V × 3 mA x 4 = 39.6 mW
15 V × 1 mA x 2 = 30 mW
Total output power consumption = 250 mW + 30 mW + 15 mW + 39.6 mW + 30 mW = 364.6 mW

Communication

Bus interface

USB 2.0 Hi-Speed

Physical Characteristics

Clean the hardware with a soft, nonmetallic brush. Make sure that the hardware is completely dry and free from contaminants before returning it to service.

Dimensions (without screw terminal connector)
NI myDAQ device part number 195509D-01L and earlier	14.6 cm × 8.7 cm × 2.2 cm (5.75 in. × 3.43 in. × 0.87 in.)
NI myDAQ device part number 195509E-01L and later	13.6 cm × 8.8 cm × 2.4 cm (5.36 in. × 3.48 in. × 0.95 in.)

Weight
NI myDAQ device part number 195509D-01L and earlier	175.0 g (6.1 oz)
NI myDAQ device part number 195509E-01L and later	164.0 g (5.8 oz)