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Operating Instructions-DC SO 10
I On,
n =
I to 9
-
Provides selection of minimum number
of averages in decade steps.
4 9
The incrementldecrement keys are used to in-
crease or decrease the exponent to the next legal
setting.
NOTE
The AVGS settings affects the number of digits dis-
played for Totalize measurements. When in Auto on
n=O, the first nine digits to the left of the decimal
point are displayed. When n=
1
to 9, the measure-
ment result is "scaled" by 10
"
and displayed.
This button increments the appropriate trigger level if
LEVEL CH A -CH B is selected, or the number of averages if
AVGS has been selected. Voltage levels are incremented or
decremented in steps of 4 mV
x
attenuating setting.
i(t This button decrements the appropriate trigger
level if LEVEL CH A
-
CH B is selected, or the number of
averages if AVGS has been selected.
@
AUTO TRIOIAUTO
If the LEVEL buttons and the AVGS button i ~ e unlighted,
-
pressing this button causes an auto trigger on lboth Channel
A and Channel B (the maximum and
minimum^
peak values
of the Channel A and B input signals are measured and the
trigger levels are set at the midpoints). If LEVEL CH A is
selected, pressing this button causes an Auto trigger on
Channel A only, and similarly for LEVEL B lighted. If AVGS
is lighted, pressing the button enters a -1, which is the
code for Auto Averages.
@
NULL
Pressing the NULL button stores the present measure-
ment result and then subtracts that number from all subse-
quent measurements (while the button remains lighted). It is
most useful in Time A-B
measurements, wh'ere it can be
used to null out systematic errors such as unequal cable
lengths and channel mismatches; however, it is available in
all measurement functions.
The averages setting may be changed without losing the
NULL stored measurement. Now, the instrument will be
subtracting two numbers of differing resolutioln. Since the
result of such a subtraction actually has the resdution of the
lesser resolution number, that is the one that the counter
automatically uses to determine how many digits to display.
--
LIMIT
Pressing the button again will re-null the result.
This light goes on whenever either the increment
(t)
or
To exit the Null mode, press any function b ~ ~ t t o n
(includ-
decrement
(1)
button has incremented or decremented a
ing that of the function already chosen).
setting to its limit. This light goes out when increment
(7)
or
decrement
(1)
button is released.
When either of the LEVEL CH A, LEVEL CH B buttons or
the AVGS button is lighted, this button alternates what is
being displayed in the seven-segment readout. Pressing it
once makes the readout revert back to displaying the func-
tional results (frequency, period, etc.) while still leaving the
incrementldecrement buttons active. Pressing the button
again will alternate the display back to showing the voltage
level or averages exponent. This allows the user to view
either the parameter being changed or the effect of that
change on the functional results.
When the LEVEL buttons or the AVGS button is
unlighted, the ,TESTIDISPLAY button is used to select the
Test mode. In this mode a portion of the power up test (all
but the RAM portion) is repeated. If an error is ever encoun-
tered, the test stops, with the appropriate error code dis-
played. To exit Test mode, push any other function key.
This pushbutton, when pressed, displays the current
GPlB address and message terminator selected in the
DC 501 0. It will send an SRQ if enabled, even when in Local
Lockout, and it's therefore a useful way for art operator to
signal the controller during the running of a program.
@
MEASUREMENT STARTISTOP
This pushbutton can be used in all of the Function modes
except Probe Comp and Test. When it's lighted, measure-
ment is in the "STOPped" state. Pressing the button causes
a "STOPped", Totalize, or Time Manual measurement to
"Startn from the displayed result. Other measurements (ex-.
cept Probecomp and Test) will "Startn a new measurement.
When "Started", pressing the button causes all measure-
ments (except Probecomp and Test) to stop counting.
When "STOPpedn, Totalize and Time Manuial measure-
-?
ments read the final count in the count chains; and update
the display one more time.
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