HP 61010A Owner's Manual page 21

Step 6
• When you select DIG.IN.01, the DIG.IN.01
information in the System View window disappears, and a
front panel representation of the Digital Input replaces the
Digital Output in the Interactive Instrument Window. The
default base for DIG.IN.01 is decimal. Notice that with the
input connector disconnected, a -1 appears on the display
(see Figure 2-7). This is because the Digital Input is
reading all 16 input bits as being high due to internal pul-
up resistors and the fact that the logic sense is positive.
The -1 is the 2's-complement representation of all 16
input bits being high. To illustrate how the Digital Input
can format the input data on the display, point to and
select 2's in the set compl field. (The set compl field
toggles between 2's and UNSIGN).
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Figure 27. Change Complement to Unsigned
Trying Out Your instrument 2-9