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If it is desired to retain the displayed M value, proceed
to step 4. If it is desired to modify the M value, do so as
explained in paragraph 2.8.1 Cursor and Data Enhy Note
that valid M values are in the range of -9.999999 to
+9.999999.
With a M value displayed, press the ENTER button. The
following
message will be displayed
briefly:
ENTERED
The current B value will now be displayed. If the factory
default
value is the current
B value,
the following
message will be displayed:
B= 0000.000
Decimal point position
is determined
by the ran e that
the instrument
was on when this program was se B ected.
If it is desired to retain the displayed B value, proceed
to step 7. If it is desired to modify
the value of M, do
so as explained in paragraph 2.8.1 Cursor and Data Engi
Note that the B value range is from 0.0001x10-' to
+9999.999.
With a valid B value displayed, press the ENTER button.
The following
message will be displayed briefly and the
instrument
will return to the previously
defied
state of
operation.
ENTERED
Notes:
1. User selected values of M and B will be stored within
the Model 193A until the power is turned
off (unless
saved bv Prorram
90). These constants will be used
whenevir
Mf+B
is enabled.
Note, however, that the
value of B is scaled according to the range in use. Exam-
ple: A value of 19.00000 entered for B is actually 19.OOOOOV
with the instrument
on the 20V range and lYO.OOOOV with
the instrument
on the 2OO.OOOOV range.
2. The user can set the values for M and B as the power-up
default values by running
Program 90 (see paragraph
28.9).
2.8.14 Program
95 (Multiplexer)
The multiplexer
auto zeroical routines may be defeated by
running
Program 95. Using the Model lY3A with the auto
zeroical defeated increases measurement
speed and is
useful for making high impedance
DC voltage measure-
ments which can be affected by the input multiplexing.
Per-
form the following
steps to run this program:
1. Press the PRGM button. The following
prompt will be
displayed:
PROGRAM
?
2. Enter the number 95 by pressing the "9" and "5" buttons.
The current multiplexer
status will then be displayed.
For example,
if the multiplexer
is on, the following
message will be displayed:
MUX ON
3. If the alternate multiplexer
status is desired, press one
of the range buttons.
The alternate status will be dis-
played as follows:
MUX OFF
4. To enter the displayed
multiplexer
status, press the
ENTER button. The following
message will be displayed
briefly and the instrument
will return to the previous
operating
state.
ENTERED
2.8.15 Program
98 (Cal)
The user can easily perform front panel digital calibration
by applying accurate calibration signals and using Program
96. The calibration
signals can be either prom ted default
values or numbers entered from the front pane P Paragraph
6.6.5 describes the basic steps for using this program, while
paragraphs 6.6.7 through 6.6.12 provide the complete front
panel calibration
procedure.
2.9 FRONT PANEL TRIGGERING
On power-up,
the instrument
is in the continuous
trigger
mode with the conversion rate determined
by the internal
time base. The instrument
can be laced in the one-shot
trigger mode, which allows one rea dtl g to be triggered each
time the TRIGGER button is pressed. The one-shot trig-
ger mode is accessed through the data store. The basic pro-
cedure to place the instrument
in the one-shot mode is to
turn on the data store, enter the one-shot mode and select
an ap ropriate buffer size. Each tri
store 8. m the data store. Paragraph
ered reading is then
5% provides a detailed
procedure
for using the data store and recalling the trig-
gered reading.
2-30
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