HP 5004A, Operating And Service Manual

Page: 19 / 74

M o d e l
Operation
FRONT PANEL FEATURES
FOUR-DIGIT DISPLAY: Shows the unique signaure stimulated by the input signals.
GATE Lamp: Regular blinking of GATE lamp indicates proper gating
signals.
UNSTABLE SIGNATURE Lamp: Intermittent or occasional blinking of this lamp indi-
cates a difference between successive signatures inputted to the
PROBE TEST Connector: Test point for data probe in SELF-TEST mode.
DATA PROBE: Point of entry for data from unit being tested by Lamp near probe
tip indicates logic level at tip: O n Bright
=
High, O n Dim
=
Bad-level, Off
=
Low, ns
or greater pulses are stretched to ms. Note side ground connector for fast circuits and
RESET switch.
START Test Point: Test point for the START test connector on the active pod in the SELF-
TEST mode.
STOP Test Point: Test point for the STOP test connector on the active pod in the SELF-
TEST mode.
CLOCK Test Point: Test point for the CLOCK test connector on the active pod in the SELF-
TEST mode.
Active Test Pod: Four test inputs START, STOP, CLOCK, and a common GND (ground)
are extended with this active pod for fast rise time signals and low circuit loading.
START Test Lead: Point of entry for START signal the unit being tested by the
STOP Test Lead: Point of entry for STOP signal from the unit being tested by the
Lead: Point of entry for CLOCK signal from the unit being tested by the
GND Test Lead: Common (ground) test lead for connection to unit being tested by the
SWITCH NOTE
The following six switches
,
and all pushed once to lock in-on
and push again to release out-of switches.
SELF-TEST Switch: When pushed and locked in. this test puts the in the SELF-
TEST mode. (See SWITCH NOTE above.)
HOLD Signature Switch: When pushed and locked in, this switch will hold a single, one-
time signature for comparison or recording. (See SWITCH above.)
STOP, and START Switches: These three switches are set to select either
the positive-going (indicates switch position) transition or the negative-going
(indicates switch position) transition of the respective signals as the active con-
trol for that signal. The CLOCK, STOP, and START switches are respectively the active
control switches for the CLOCK, STOP, and START test inputs on the active pod. (See the
SWITCH NOTE.)
LINE OFF ON Switch: (Indicates switch position.) This switch controls application of
mains line power to the Line power i s applied when the switch is pushed and locked
in. Line power i s disconnected when the switch is out. (See SWITCH NOTE.)
Handle-Stand: The combination handle and stand can be rotated by pulling gently at the
side pivot points both sides simultaneously and turning the handle to the desired position.
Figure Front Panel, Probe, and Pod Features (Continued)