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OPERATION
This display indicates that the channel 2 reading is being
subtracted
from the channel
1 reading.
Note that the
displayed value has 4% digit resolution
and includes an
exponent
and appropriate
units.
If one or both channels are programmed for mathematical
functions,
those functions
are performed
prior to the
algebraic subtraction
process. For example if channel 1 is
programmed
for the average function,
and channel 2 is
programmed for the TRMS function,
the display will show
the difference between the channel 1 average and the chan-
nel 2 RMS value.
Any combination
of math functions
for the two channels
is valid, with the restriction that units must match. For ex-
ample, you cannot subtract volts from volts seconds.
If either channel is in the waveform mode, the sample that
is normally
displayed
will be applied
to the Civil-CHZ
mode. If either channel is in the overflow condition,
the
result of the subtraction
will be overflowed.
3.14.2 Ratio Mode
The Model 194 can be programmed
to display the ratio of
channel 1 to channel 2 by pressing the CHltCH2
button.
The instrument
will then display the ratio of the two than-
nels. A typical display might be:
2.3451EOI V 312.
Again, the displayed value has 4% digit resolution
and in-
cludes an exponent along with appropriate
units.
Any previously
selected mathematical
operations
will be
performed before the division process is completed. When
in the waveform mode, the instrument
will use the nor-
mally displayed waveform reading as input for the ratio
calculation. Any combination of math functions for the two
channels is valid.
If the channel 2 reading is zero, the OFLO message will
be displayed.
3.15 STATUS
By pressing the STATUS key, you can obtain and display
the status of the channel 1 AID converter, as well as the
A/D converter in channel 2. To check status of a particular
channel, you must be in the single channel display mode
for that channel.
STATUS
BUTTON
When STATUS is pressed, the instrument
displays the
status of various operating
parameters in the following
order:
Zero value
Filter mode
Trigger source
Trigger mode
Delay (in time or number of samples)
Trigger level (if source is the input signal)
Sample rate
Measurement
size (in elapsed time or number of samples)
Maximum
sampling
rate for 16.bit resolution
Maximum
sampling
rate for &bit resolution
Once the status mode is entered,
the unit will scroll
through and display the various status parameters at a rate
of one per second.
Table 3-12 shows typical
display
messages. To terminate the status mode, press any other
front panel key. For example, you might wish to press
CHANNEL,
which
will
return
the instrument
to the
previous
mode.
3-34
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