will display the amplitude of the selected channel divided by the
amplitude of the reference channel.
The upper center section of the display shows the amplitude the
reference channel. The upper center soft key selects the display units.
The usual set of relative and absolute units are available.
The upper right section of the display can show the frequency of the
reference channel or the phase of the selected channel relative to the
reference channel. Frequency is displayed in Hz and phase in degrees,
in the range of –180 to +180 degrees.
The INPUT keys are used to select among the possible combinations of
selected channel and reference channel. The INPUT A key will cycle
through the following options:
.
A/B – The channel A input is selected; B is used as the reference
.
A/G (analog only) – The channel A input is selected; gen-mon
channel A is used as the reference
The INPUT B key will cycle through a similar set of options, but B will
always be selected as the measured channel.
For analog measurements, 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 this setting does not
matter. If both are below 8 mV, the reading will never 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.
Digital Ratio mode does not have this limitation or the Mode option.
4 Functions
Function Descriptions Ratio
ATS-1 Dual Domain User's Manual 4-29
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