Pressing INPUT A or INPUT B will select the chosen channel for
measurement, with the other input channel as the reference. Pressing
GEN will use the gen-mon signal for the same channel as the
reference.
The lower left soft key is used to optimize the use of the meters. There
are two meters used for a ratio measurement, and one of the two loses
accuracy below about 8 mV. Therefore, it is necessary to restrict one
of the two measured amplitudes to values above 8 mV.
You can choose which amplitude is restricted to higher values using
the lower left soft key. If the display reads MODE 1, then the channel
used for the denominator value (the downstairs value in the fraction)
should not be less than 8 mV. If the display reads MODE 2, then the
channel used for the numerator value (the upstairs value in the
fraction) should not be less than 8 mV. MODE 1 is the same as older
Portables which did not have this feature.
If both measurements are well above 8 mV, then the MODE setting
does not matter. If both are below 8 mV, the reading will not be valid.
If the restricted meter reads below 8 mV, the display will read Low.
A table summarizing this information is shown on the following page.
FREQUENCY
COUNTER
GENERATOR
MONITORS
B
A
INPUT
RANGING
INPUT
TERMINATION
INPUT
TERMINATION
LCD DISPLAY
INPUT
RANGING
SECONDARY
READING
DETECTOR
INTERNAL
JUMPER
INPUT
MONITOR
SPEAKER/
HEADPHONE
READING
MONITOR
CHANNEL A
CHANNEL B
PRIMARY
READING
DETECTOR
RATIO (X/Y)
PROCESSING
Figure 4-27. Block diagram of analog RATIO measurement
4 Functions
Ratio Function Descriptions
4-30 ATS-1Access User's Manual
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