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GETTING STARTED
@ SOURCE-Selects
the trigger
source. The trigger
stimulus
can come from an external trigger, the input
signal, the other channel (for dual-channel
instruments),
or with the TRIGGER button.
Sources are selected with
uprange and downrange. The instrument
may also be trig-
gered with IEEE-488 commands, as discussed in Section 4.
@ (XV DATA)-Selects
the data source for the analog
output.
Available sources include
instrument
displayed
readings, the measurement buffers or 64k RAM for either
channels 1 or 2 (channel 2 is available only with the Model
1944 option installed),
or the IEEE reading buffer.
@ DELAY-The
DELAY key is used to program
the
beginning point of a measurement sequence relative to the
applied trigger stimulus. Both post- and pre-trigger modes
are available. With post trigger, the instrument
waits the
programmed period before beginning sample storage; with
pre-trigger, the instrument
begins storing samples at the
programmed
interval before the trigger point. Both are
available with all trigger sources.
@ (XV PAN)-Th'
k y II
IS e a ows you to select which group
of samples located in the measurement buffer will be ap-
plied to the analog output. XY PAN effectively moves the
analog output viewed data left or right.
@ SLOPE-The
SLOPE button selects whether
the in-
strument is triggered on the positive or negative edge of
the input waveform. The two annunciators
adjacent to the
SLOPE button indicate the selected mode. Slope selection
is applicable only when triggering from the input signal.
@ LEVEL-The
LEVEL button permits you to program
the signal voltage level at which the instrument
is triggered
only when triggering
from the input signal. Trigger level
values are keyed in with the data entry keys.
0 g (XV ZOOM)-Applies
a magnification
or reduction
factor to the horizontal
axis on plots. XY ZOOM works in
conjunction
with XY PAN to sweep and expand areas of
interest, or to get an overall view of collected data.
0
'0
SCAN-The
SCAN kev is intended
for use with a
scanner module to become~available
in the near future.
0
"
CPLG-CPLG
selects AC, DC, or ground coupling
modes analogous to those found on an oscilloscope.
AC
and DC coupling are indicated by the respective indicators.
Ground coupling is selected when both indicators xc off.
0
I2
SAMPLES-Allows
selection of the amount oi data
taken by programming
the number of s.m~plcs to t&x dur-
ing a measurement
cycle, ur the tinw
duration
of a
measurement.
The number of samples or the duration oi
the measurement
cycle are keyed in with the data en+
keys. Time duration or number of samples is selected xvith
the FREQiTlME
key.
0
l3
RATE-Allows
the sclcction
of thr spwd
uf data
taken by programming
sampling frequency or the time iw
terval between individual
samples. Time or frequency iw
formation (controlled
by FREQITIME)
is keyed in with the
data entry keys.
0
'4
LOCAL-The
LOCAL key is used to wmwc' tht. iw
strumcnt from the remote mode when it is being used owl
the IEEE-488 bus. Note that all front panel controls erccpt
LOCAL and I'OWER will be inoperative
when the instrw
ment is in remote (REMOTE indicator
on). LOCAL \\-ill
also be inoperative
if the IEEE-488 LLO (Local Lockoul)
command is in effect, as discussed in Section 4.
0
I5
CHANNEL-When
the instrument
is equipped
with
the optional
Model 'I944 module, the CHANNEL
button
is used to select which channel is to be displayed.
'Three
basic modes are available: channel 1, channel 2, and dua-
channel display. For the two single-channel
modes, the
display mode also dictates which channel is affected b!
the other front panel buttons. Most of the other buttons
are inoperative
when the dual channel display mode is
selected. CHANNEL
is also used to return the display to
the previous operating mode when using many Model 194
functions.
2-5
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