HP 5004A, Operating And Service Manual

Page: 17 / 74

Model
Operation
SECTION
OPERATION
INTRODUCTION
3-2. This section explains the functions of the operating controls, indicators, probe, and test
connectors of the
Signature Analyzer. An operator's self-test is given, and the normal
operating modes are described.
PANEL FEATURES
3-4. Front panel features of the Signature Analyzer are described in Figure 3-7. This figure
contains
a detailed description of the controls, connectors, and indicators.
DISPLAY
3-6. Signature Analyzer presents digital signatures with a
display on its front panel. Each character, which can be any one of 16 symbols, is shown on a
segment display 10 by 7 millimetres. The 16 possible characters are:
I -1 I 11- 11
I
I
3-7. The characters presented on the display are a hexadecimal number which is the residue
of
a count in the after a START and a STOP signal have been received with some data
bits in between.
NOTE
No signature appearing on the display has any particular signif-
icance beyond being a correct (expected) signature or an incorrect
signature. The number
is, however, a count residue in the con-
verted to and displayed in hexadecimal.
HEXADECIMAL NUMBER SYSTEM SYMBOLS (DIGITS)
3-9. The four-digit front panel display presents numbers in
a
special set of hexadecimal
symbols (see preceding paragraph). Note that the final six symbols are not the common hexa-
decimal symbols ABCDEF because the seven-segment display of the can not show a B
or D that would be different from an 8 or 0 respectively (and several other symbols could be
ambiguous).
3-10. TEST TERMINAL GRABBER CONNECTORS
3-11. Five test-terminal grabber-connectors are supplied with the
grabbers are
push-on pull-off connectors. A grabber can be used on the end of the active test pod test leads
to make reliable electrical connections from the to the instrument being tested.
shows grabbers connected to the pod test leads. Figure 3-4 shows grabbers connected to a
device being tested.
removeable ground (common) test lead for the probe also has a grabber.