Controls, Connectors,
and
Indicators
5-30
MIN/MAX
RESET
@ REF DISPLAY
/REF SET
REF
DISPLAY
REF SET
HIGH
and
LOW
Connectors
@
Fuse
Initializes the minimum and maximum values when
the next measurement is made.
Selecting a new
DMM function
also resets the minimum and
maximum
values.
Displays
or
sets a reference measurement.
Shows the present reference value. If no reference
has been set, the
display will show
O.
Initializes the reference value
to
the present display.
All subsequent measurements will be displayed with
this reference
value subtracted from them. If no
measurement is displayed,
or
if the present
measurement is
out
of
range, REF SET has no
effect.
When a measurement has a reference
value
subtracted from it, the display includes a A symbol.
With
dBV
or
dBm, the reference takes the place
of
V
ref
•
Selecting a
new
DMM function
or
turning off
power
clears the reference. The reference is retained
if another instrument function, such as
At, displaces
the DMM measurement and then the same DMM
measurement is selected again.
Provide high-impedance, floating inputs
to
the DMM. For
DC and resistance measurements, the upper, red
terminal is positive and the
lower, black input is
negative.
Excessive input in a current-measuring mode may open
the input fuse.
If the fuse opens, none
of
the DMM
functions
will work.
To
replace the fuse, turn off the
instrument, remove the DMM probes, and unscrew the
fuse
holder. Replace the fuse with a 1.5 A, fast acting,
3AG fuse. (The fuse
holder will accept a 5 X 25 mm
fuse, with the appropriate cap substituted for the
original.) Then, replace the probes and turn on the
instrument.
2465A/2455A/2445A Operators
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