1-30 Return to Section Topics 4200-900-01 Rev. K / February 2017
Section 1: Getting Started Model 4200-SCS User’s Manual
Input filter
For the Model 4200-SCP2 scope, A 20 MHz low-pass analog filter can be applied to the input
signal of each channel. The 20 MHz setting applies the filter, and the bypass setting bypasses the
filter. The Model 4200-SCP2HR does not have the low-pass filter.
Input attenuation
The input signal for each channel can be attenuated by a factor of 0.9 to 1000.0.
Acquisition sample rate
The acquisition sample rate for the two input channels can be set in 1, 2.5, or 5 steps:
• 4200-SCP2HR: 10 kS/s to 200 MS/s (one interleaved channel can be sampled at 400 MS/s)
• 4200-SCP2: 2.5 kS/s to 1.25 GS/s (one interleaved channel can be sampled at 2.5 GS/s)
Sweep mode (triggering)
There are two sweep modes to trigger scope measurements: Normal or auto. In the normal mode,
an internal or external trigger (for example, trigger output from the Model 4205-PG2) is used to
trigger measurements. In the auto mode, triggering is provided automatically by the scope in the
absence of a trigger event.
For normal triggering, trigger initiation can be provided by internal and external sources. The
scope can be set to be triggered by a leading-edge or falling-edge trigger from the Model
4205-PG2. For more information about trigger and arm controls, refer to the Model 4200-SCS
Complete Reference, ZTEC User’s Manual.
Sweep offset reference
The offset reference determines when sampling occurs in relationship to the trigger event. Offset
reference can be set from 0.0 (0 %) to 1.0 (100 %). For the following examples, assume the record
size (sweep points) is 100 samples:
• Post-trigger sampling: With offset reference set to 0.0 (0 %), sampling of all 100 sweep
points will occur after the trigger event.
• Pre-trigger sampling: With offset reference set to 1.0 (100 %), sampling of all 100 sweep
points will occur before the trigger event.
• Pre-trigger and post-trigger sampling: With offset reference set to 0.5 (50 %), 50
samples will be acquired before the trigger event, and 50 samples will be acquired after the
trigger.
A sweep offset time can also be used to affect when sampling occurs.
Sweep offset time
The sweep offset time is the time period between the trigger event and the sweep offset reference.
Offset time can be set from 0 to 665 seconds. For the following examples, assume the record size
(sweep points) is 100 samples and offset time is set to 1 second:
• Delayed sampling from 0% offset reference: With offset reference set to 0.0 (0 %),
sampling for all 100 sweep points will start one second after the trigger event.
• Delayed sampling from 100% offset reference: With offset reference set to 1.0 (100 %),
all 100 samples will have been acquired at the “trigger plus on
e second” point in time.
• Delayed sampling from 50% offset reference: With offset reference set to 0.5 (50 %), 50
samples will have been acquired at the “trigger plus one second” point in time. Sampling will
continue for the other 50 sweep points.
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