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GETTING
STARTED
0
* ENTER-The
ENTER key performs the final step in
the data entry process. Once the desired data appears on
the display, pressing ENTER will store the data in memory
for use by the mode in question. Modes requiring
data en-
try are summarized
in Table 2-2.
0
3 CANCEL-This
key can be used during the data en-
try mode to cancel keyed in data without
actually enter-
ing it into memory.
0 4 FREQ/TIME-FREQITIME
is used to enter reciprocal
frequency or time information
while programming
sam-
ple rate, scan rate, samples per measurement,
or trigger
delay.
Q-O
5
sg Data Entry
Keys-The
data entry keys, which
include 0 through 9, +/-, ., MHz (cs), kHz (ms,mV), and
Hz (s,V), are used to enter data into the instrument
for
those modes that require data entry, such as samples, rate,
level, delay, and so on. The type of units will depend on
the entry mode. For example, time or frequency would be
in effect when entering sampling rate, while voltage units
(mV or V) would apply when entering a trigger level. The
mode of the MHz (ps), kHz (ms), and Hz (s) keys is deter-
mined by the FREQiTIME
key-- not by the shift key. Table
2-2 lists modes, limits, and resolution values for the various
modes programmed
with the data entry keys. The MHz,
kHz, and Hz keys implicitly
perform an ENTER.
Table 2-2. Limits and Resolution
for
Programmable
Parameters
Mode
Limits
RATE
Time @sec.lsec
Frequency lHz-lMHz
SAMPLES
No: l-65,535*
Time: Orsec-65,534sec*
DELAY
No: Samples -65,536 to 10'
Time: -65,536 to +lO'sec
LEVEL
*zoov
ZERO VAL
12OOV
x Output
l-1OV nominal
Full Scale**
Y output**
l-1OV nominal
Full Scale
I
1
i
*32,768 in 16.bit mode
**Accessed with OTHER key.
&3olution
O.lpSK
HZ
Samples
O.l@C
Samples
O.l@seC
P'v
F'v
PV
0
5 (CHi+CH2)-This
key programs the instrument
to
display the ratio of the channel 1 reading to the channel
2 reading. It is operational
only if the Model 1944 option
is installed
in the CARD 2 location.
0 6 (CHl-CH2)-This
button programs the Model 194 to
display the algebraic difference between channels
I and
2. It also is operational
only if the Model 1944 option is
installed
in CARD 2.
0 7 (OTHER)-This
key gives access to various
front
panel programs,
including
IEEE-488 address, self test,
digital calibration,
NVRAM
programming,
X output full
scale value, Y output full scale value, and Z output blanks
ing level.
0 B (WAVEFORM)-Pressing
this key displ.~ys the ~a">~
pie at the trigger point.
0
30 (PK TO PK)-l'ak-to-peak
values of the nlrasurr-
ment can be displayed by pressing I'K TO I'K. I'eak-twpr,lk
values are calculated by subtracting the most negative salw
pie from the most positive sample.
0
3'
(STD DEV):-The
standard deviation of the mel~surc~
ment samples can be displayed by pressing this button.
The standard deviation
gives a measure of thr spread <of
sample
data in comparison
to the weragc
of the
measurement.
0
32 (INTEGRAL)-The
integral
of the measurement
samples is obtained with the INTEGRAL
button. The iw
tegral function
returns the area under a curve (in vo11-
seconds), which
is bounded
by the amplitude
of the
samples and the measurement
duration.
@
(SETUP)-T wo different combinations
of instrument
operating modes may be stored and recalled through ust'
of the SETUP key. Stored configurations
arc retained whrn
power is removed. Setup can also be used to restore fac-
tory default configuration.
@
(AVG)-Display
s the average of samples taken dur-
ing a measurement
sequence. The average \,rlluC is simp-
ly the sum of the samples divided
by the numbtv
of
samples in the measurement.
2-7
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