Measurement-computing WaveBook rev.4.0 Uživatelský manuál stáhnout pdf (Strana 60)

4-14 WaveBook Operation Reference

06-08-01

WaveBook User’s Manual

The time needed to complete the final pre-trigger scan is part of the trigger latency; and so, in the pre/post-

trigger mode, the trigger latency may be greatly increased.

Not only do the trigger latency and jitter depend on the pre- vs post-trigger type of acquisition, they also

depend on the trigger source: Software, digital (TTL), single-channel (Channel 1 analog), or multi-channel.

The following table gives the trigger latency and jitter for each of the different trigger sources and

acquisition modes:

Acquisition Type Trigger Source Max. Trigger Latency Trigger Jitter Notes

Software 100 µs + T 100 µs + T a, c

Digital (TTL) 200 ns + T 50 ns + T c

Single-Channel 300 ns + T 50 ns + T c

Multi-Channel 2 * T - NS µs T c, d

Digital Pattern 300 ns + T 50 ns + T e

Pre-Trigger

Pulse 300 ns + T 50 ns + T e

Software 100 µs 100 µs a

Digital (TTL) 200 ns 50 ns

Single-Channel 300 ns 50 ns

Multi-Channel 2 * NC + 3 µs NC +2 µs b

Digital Pattern 300 ns 50 ns e

Post-Trigger

(N-Shot,

N-Shot with re-arm, or

infinite-post-trigger)

Pulse 300 ns 50 ns e

Notes:

a) Software trigger latency and jitter depend greatly on the host computer's speed, operating system, and

printer-port protocol. Most systems should take much less than 100 µs.

b) NC is the number of channel samples used for multi-channel triggering, from 1 to 72, as specified by the trigger

configuration.

c) T is the pre-trigger scan period.

d) NS is the number of samples in a scan including, if present, the first "dummy" sample, from 1 to 128.

e) WaveBook/516 series only

Pulse Trigger

(WaveBook/516 Series Only)

In addition to the standard “single-channel” trigger-on-level functions, the WaveBook/516 system supports

pulse trigger. The connection is made via BNC connector located next to the Channel 8 BNC. With pulse

trigger, you can define both the amplitude and the duration of the pulse that will be used to trigger the

acquisition. Pulse trigger can be used to detect spurious transients that can be missed by simple level

triggers.

Pulse Trigger allows the use of a high-

bandwidth input for triggering, and the

correlation of lower-speed waveforms with

the occurrence of a high-speed pulse. You

can set a pulse amplitude between

5 V and

a pulse width in the range of

100 ns and 800 ms.

Pulse Trigger Selected

This option allows you to trigger on analog level “pulses” on either the Channel 1 input or the Pulse Trigger

input. This trigger type is similar to the Channel 1 Analog trigger but places an additional time-based

condition on the signal. Depending on whether the pulse width is set as a minimum or a maximum, the

signal either must or must not cross the threshold again within the given amount of time.

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