USB-1616HS-2 User's GuideSpecifications

Triggering

 

 

Table 8. Trigger sources and modes

 

 

Trigger source

Explanation

 

 

Single channel analog

Any analog input channel can be software programmed as

hardware trigger

the analog trigger channel, including any of the analog expansion channels.

 

ƒ

Input signal range: -10 V to +10 V maximum

 

ƒ

Trigger level: Programmable (12-bit resolution)

 

ƒ

Latency: 350 ns typical, 1.3 µs max

 

ƒ

Accuracy: ±0.5% of reading, ±2 mV offset maximum

 

ƒ

Noise: 2 mV RMS typical

Single channel analog

Any analog input channel—including any of the analog expansion channels, can be selected as

software trigger

the software trigger channel. If the trigger channel involves a calculation, such as temperature,

 

then the driver automatically compensates for the delay required to obtain the reading, resulting

 

in a maximum latency of one scan period.

 

ƒ

Input signal range: Anywhere within range of the trigger channel

 

ƒ

Trigger level: Programmable (16-bit resolution)

 

ƒ

Latency: One scan period (maximum)

External-single

A separate digital input is provided for digital triggering.

channel digital trigger

ƒ

Input signal range: -15 V to +15 V maximum

 

ƒ

Trigger level: TTL level sensitive

 

ƒ

Minimum pulse width: 50 ns high, 50 ns low

 

ƒ

Latency: One scan period maximum

Digital pattern

8-bit or 16-bit pattern triggering on any of the digital ports. Programmable for trigger on equal,

triggering

not equal, above, or below a value.

 

ƒ

Individual bits can be masked for "don't care" condition.

 

ƒ

Latency: One scan period, maximum

Counter/totalizer

Counter/totalizer inputs can trigger an acquisition. User can select to trigger on a frequency or on

triggering

total counts that are equal, not equal, above, or below a value, or within/outside of a window

 

rising/falling edge.

 

ƒ

Latency: One scan period, maximum

Frequency/pulse generators

Table 9. Frequency/pulse generator specifications

Channels

2

× 16-bit

Output waveform

Square wave

Output rate

1

MHz base rate divided by 1 to 65535 (programmable)

High-level output voltage

2.0

V minimum @ -1.0 mA, 2.9 V minimum @ -400 µA

Low-level output voltage

0.4

V maximum @ 400 µA

Power consumption

Power consumption specification is for a USB-1616HS-2. Add 400mW for a USB-1616HS-2 connected to an AI-EXP48 expansion module.

Table 10. Power consumption specifications (Note 5)

Power consumption (per board) 3000 mW

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Measurement Specialties USB-1616HS-2 manual Frequency/pulse generators, Power consumption, Trigger sources and modes