Keithley 486 Instruction Manual page 10

SAFETY WARNINGS
The following prec.~tions should be observed before us-
ing Model 4&X/487. Refer to main manual for detailed
safety information and complete operating instructions.
The Model 486/487 is intended for use by qualified per-
sonnel who recognize shock hazards snd are familiar
with the safety precautions required to avoid possible in-
jury. Read over the instruction manual carefully before
using the ins+nunent.
Before operating the instrument, make sore the line cord
is connected to a properly grounded power receptacle.
Exercise extreme caution when a shock hazard is present.
Lethal voltages may be present on the test fixture or the
Model 487 output jacks. The American National Stan-
dards Institute WNSI) states that a shock hazard exists
when voltage levels greater than 30V RMS or 424V peak
are present. A good safety practice is to expect that haz-
ardo~voltageispresentinany~o~cirmitbefore
measuriug.
Inspect the connecting cables, test leads, and jumpers for
possible wear, cracks, or breaks before each use.
Formadmumsafety,donot touchtheModel487connec-
tions, teat fixture, test cables or connections to any other
instruments while power is applied to the circuit under
test. Turn off all power and discharge all capacitors be-
fore connecting or disconnecdng cables or jumpas. Also,
keep the test fixture lid dosed while power is applied to
the device under test. Safe operation requires the use of
the lid interlock.
Do not touch any object which could provide a current
path to the common side of the &cuit under test or
power line (earth) ground.
Do not exceed the maximum signal levels of the in&u-
ment, as shown on the rear panel and as defined in the
specifications and operation section of the instnxtion
manual.
Connect the - screw of the test fixture to safety earth
0
ground using #I8 AWG or larger wire.
hstmnentation and accessories should not be connected
to humans.
Maintenance should only be performed by qualified
service personnel. Before performing any maintenance,
disconnect the line cord and all test cables from the in-
strument.
CONTROL SUMMARY
DISPLAY INTENSl7Y: Selects normal/dim/off display.
LOCAL: Places unit in local and restores front panel key
opergion.
MENU: Use with the knob or cursor keys to configure the
following menu items; data store, data recall, I-limit
(Model487), integration, IEEE-488 bus Coos or talk-only),
defaults, self&t, debug, calibrate, and V-Source calibrate
(Model 487 only).
SHIFT EXIT:
&ik MENLJ or trigger SETUP.
ZERO CHECK Allows check of offsets, and must be dis-
abled to obtain an input signal measurement.
SHIFT CORRECT: Performs automatic zero correction to
null insment offsets.
FILTER: Enables or disables the selected filter(s).
SHIFTFILTER SELECT: Use with knob or cursor to select
the f&r(s); digital, analog, or digital + analog.
REL Use to establish a baseline using the displayedread-
ing.
V RANGE A: Use range keys to select a lower or higher
current range.
SHm AUTO RANGE: Use to enable/disable autorange.
SETLIP: Use with knob or cursor keys to con@ure the fol-
lowingtriggersetupitems;triggermode,triggerinterval,
trigger delay, and bigger source.
OPERATE: Places V-Source of Model 487 in operate or
standby.
TRIGGEE Press to trigger a reading or start the data
store.
PRESET: Toggles between two preset V-Source values
(Model 487 only).
SHIFT OHMS cV/Ij: Press to select V/I Ohms.