Tektronix 8001A Installation Manual page 69

Real Time Prototype Analyzer
2393-11
Fig. 8-3. Data Acquisition Interface Panel.
In the upper left hand corner of the panel is a clock polarity switch. This switch selects
either the rising or falling edge of the incoming clock signal to latch Probe data within the
Interface.
Next to the clock polarity switch is the threshold level switch. When the threshold switch is
in the upward position, input channels 0 through 7 are variable from
+
10 to -10 volts.
Adjustment for this variation is made by a potentiometer accessible on the right side of the
rear panel. With the threshold switch in the center position channels 0 through 3 are variable
and channels 4 through 7 are at a TTL level (+1.4 volts). When the threshold switch is in
the lower position, channels 0 through 7 are at a TTL level.
The upper right side of the Data Acquisition Interface panel contains the variable threshold
adjustment control and monitor. The monitor jack a!!ows the operator to monitor the
variable threshold voltage while adjusting it. Voltage monitoring must be done with a
voltmeter having an input impedance of at least 10 M.
8001/8002 Installation Guide
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8-7