Atec Wavetek-295-296 - Manual (Page 4)

8
Sequence Operation
Linked sequence mode provides the ability to link
multiple user-defined waveforms together into a
long and complex waveform sequence. Any user-
defined waveform may be assigned as a segment in
the sequence. Each segment can be assigned a
unique loop count, start mode, advance mode and
sample frequency. With the 296, a 16-bit value or
“tag” unique to each segment drives the Digital
Output, the lower 12 bits drive the Segment DAC.
Two channels may be linked together via inter
channel triggering and summing to double the
effective sequence length.
Number of Waveform Segments (296, per
channel): 2 to 4096
Number of Waveform Segments (295, per
channel): 2 to 4
Segment Loop Count: 0 to 1,048,576 program-
ming a 0 indicates continuous repetition.
Start Conditions: Automatic or selected start
trigger event
Advance Conditions: Advance on completion of
segment loop count. Advance on trigger.
Segment Clock Ratio (Model 296 only): The
clock ratio determines the ratio between the
programmed raster clock period and the sample
period of each point in the segment. Programmable
from 1 to 65,535.
Segment Tag (Model 296 only):
The segment tag is a 16-bit value associated with
the playback of the segment. All 16-bits of the
segment tag appear on the digital output connector
while the segment is active. The lower 12-bits of the
segment tag drive the secondary DAC.
Sequence Start Conditions
The playback of a sequence may be automatically
initiated or triggered.
Sequence Loop Count
The sequence loop count determines the number of
time the sequence will repeat after a triggered start.
Programmable from 1 to 65,536.
Frequency Sweep
Sweep capability is provided for standard
waveforms and Arbitrary waveforms with a length
that is a multiple of 4096 points. Any or all channels
may be swept simultaneously. A system horizontal
sweep output voltage is also provided.
Sweep Time: 30 ms to 1000 Sec (12 frequency
points at 30 ms)
Sweep Modes: Continuous up or down,
Continuous up/down, Triggered up or down,
Triggered up/down, Triggered Sweep & Hold and
Triggered Sweep & Hold with Reverse
Sweep Spacing: Linear or Log
Sweep Count: 1 to 1,000,000
Triggering
Trigger Sources
System Trigger Input Connector,Manual Trigger Key
Remote Interface Trigger, Channel Trigger Input
Connector(s), Channel Internal Trigger Generator(s),
Master Internal Trigger Generator (Derived from
Channel 1’s internal trigger generator), Previous
Channel Trigger Output, Internal Trigger Generator(s)
Period: 200 ns 10,000 s
Resolution: 200 ns
Trigger Delays and Jitter
Specified for System Trigger and Channel Trigger
input connectors with TTL input signal.
Delay:
During Standard Functions: <250 ns
During User Waveforms: <400 ns
Jitter:
During Standard Functions: <20 ns
During User Waveforms: <40 ns
Note: trigger delays and jitter specified with internal
sample clock only. If external clock is used:
Delay 7 x clock period
±
<100 nS
Jitter
±
1 clock period
Modulation
Types:
AM (Double sideband with carrier)
SCM (Double sideband suppressed carrier)
Bandwidth: > 500 kHz
Modulation Distortion:
Modulation Frequency < 100 kHz :
No harmonic > -50 dBc
Modulation Frequency < 1 MHz:
No harmonic > -30 dBc
Multichannel Analog Summing
The waveform from any one channel can be summed
into the output of any or all remaining channels. The
scale factor from the source channel’s amplitude/
offset setting to the pre-attenuated amplitude/offset
of the receiver channel is 1:1. Output attenuators on
receiver channels are selectable from the following
directly under user control:
Attenuation, dB Division, ratio
0 1/1
-6 1/2
-12 1/4
-18 1/8
-24 1/16
-30 1/32
-36 1/64
-42 1/128
Amplitude Accuracy at 1 kHz:
±
5 %
3 dB Bandwidth: >12 MHz
Multichannel Phase Relationships
Any or all channels can be assigned a fixed phase
relationship. Selected channels must be driven by
the System clock generator and the waveforms must
be of the same length and frequency. Any change in
phase angle between channels will require one
waveform cycle to re-acquire phase lock.
Phase Resolution:
User Waveforms: 360 degrees/ Waveform points
Standard Waveforms: 0.1 degrees
Phase Accuracy:
User Waveforms: ± Time Skew
Standard Waveforms:
±
(0.05
° ±
Time Skew)
Interchannel Time Skew: <10 ns maximum
Channel to Channel Time Jitter:
<0.4% peak to peak
Front Panel Waveform Creation
Modes: Freehand, line draw, line list and insert
math expressions.
Math Functions: Line, sine, triangle, pulse,
tangent, logarithmic, random and block.
Editing Tools: Copy and insert, vertical offset,
vertical re-size, delete, mirror and zoom.
Auto-Cal/Diagnostics
Each Arb Channel Module contains DC measure-
ment capability. This feature provides the ability to
conduct a limited autocal and self diagnostic. Some
parts of the calibration (e.g. amplifier flatness)
require the use of external measurement equipment.
The calibration data is stored in EEPROM on each
Arb Channel module. The Processor accesses the
data and uses it to correct each channel output as
required to maintain the specified performance.
Remote Interfaces
GPIB and RS-232 interfaces are provided.
System Inputs
Trigger: Triggers one or multiple channels.
Model 296
With 80 help screens available at the push of a
button; you don’t have to find the user manual
when you need information.