MS-500 Mixed Signal Oscilloscope Option
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ISSUED: June, 2009
MS-500-OM-E Rev C
The threshold levels can be set between -10.0 V and +10.0 V. TTL circuits use a threshold
voltage level of 1.58 V. ECL circuits use a threshold voltage level of -1.39 V. Other threshold
settings are available in the setup dialog.
The minimum high voltage level is user definable by the hysteresis control up to 1.4 V above the
threshold. The maximum low voltage level is user definable by the hysteresis control up to 1.4 V
below the threshold. The minimum signal swing is 100 mV. The
indeterminate range
of 50 mV
around the threshold voltage level is the level below which the MS-500 will not operate. However,
the MS-500 can
support a signal as low as 100 mV
only if the input signal’s quality is adequate.
Digital Logic Setup
The Digital Logic Threshold Setup dialogs are contained in both the Trigger dialogs and in the
Digital Setup dialogs. It is important to note that a selection made in one location does affect the
value in the other. Up to four different logic levels can be selected: levels can be set for lines D0
to D8, D9 to D17, D18 to D26 and D27 to D35. When connecting your lines, make sure that all
lines with like levels are connected to the same set of 9 digital lines.
Touch the Logic Setup tab to view the following dialog:
You can select various Logic Families, or select User Defined and define a custom threshold
crossing.
Threshold from - 50 mV to - 1.4 V
Threshold from + 50 mV to + 1.4 V
