# FS, ZS voltage

W

#### Wong

Jan 1, 1970
0
Hi,
Output voltage = Full scale voltage - Zero scale voltage.
Is the term Full scale means no load is connected and Zero scale
means a load is connected (opened), so output will be the difference
of these two ?
TIA.

R

#### Rheilly Phoull

Jan 1, 1970
0
Wong said:
Hi,
Output voltage = Full scale voltage - Zero scale voltage.
Is the term Full scale means no load is connected and Zero scale
means a load is connected (opened), so output will be the difference
of these two ?
TIA.
To me the term "Full scale voltage" means that the voltage is being measured
with an instrument that reads "Full scale" ie. measuring 10volts with a
voltmeter that is graduated 0-10v, the needle would then be "Full scale" at
the end of the range.
Are you becoming confused with 'voltage gain' or something. I feel that you
may not be expressing your thoughts correctly due perhaps, to a language
problem ??

J

#### John Fortier

Jan 1, 1970
0
Wong said:
Hi,
Output voltage = Full scale voltage - Zero scale voltage.
Is the term Full scale means no load is connected and Zero scale
means a load is connected (opened), so output will be the difference
of these two ?
TIA.

What circumstances are you asking about here. This sounds a bit like a
question about transmision line impedance measurement, but the names you use
are unfamiliar in that context.

Perhaps you could write back with a slightly more detailed descriptionof

John

J

#### John Popelish

Jan 1, 1970
0
Wong said:
Hi,
Output voltage = Full scale voltage - Zero scale voltage.
Is the term Full scale means no load is connected and Zero scale
means a load is connected (opened), so output will be the difference
of these two ?
TIA.

I have seen these terms used only in reference ot a voltage
measurement process. For instance, an analog to digital converter
measures a voltage by comparing it to that produced by a programmable
voltage divider connected between two reference voltages, full scale
and zero scale. If the measured voltage is equal to or greater than
the full scale reference voltage, the measurement indicates 100% of
the full scale digital value needed to program the divider to select
the full scale reference. If the measured value is half way between
the full scale reference and the zero scale reference, then the
measurement result is a digital value 50% of the way between zero and
full scale. Etc.

On many of the PIC microprocessors, you have the option to connect the
full scale and zero scale terminals of the divider to either the
supply rails (to measure 0 to 100% of output over that range of
voltages) or to connect either or both to some other reference
voltages (to narrow the span of the measurement range to increase the
precision when the input voltage is known to fall between narrower
limits).

W

#### Wong

Jan 1, 1970
0
John,
I am measuring the composite video signal output. As indicated in
the spec, the output voltage (peak to peak) is equal to FS voltage
minus ZS voltage. Since I don't really understand these two terms, so
I am doubt on the accuracy of my measurement. Please let me know if
you understand this.
Thanks a lot.

Wong

J

#### John Popelish

Jan 1, 1970
0
Wong said:
John,
I am measuring the composite video signal output. As indicated in
the spec, the output voltage (peak to peak) is equal to FS voltage
minus ZS voltage. Since I don't really understand these two terms, so
I am doubt on the accuracy of my measurement. Please let me know if
you understand this.
Thanks a lot.

This sounds like FS is the most positive peak voltage and ZS is the
most negative peak voltage.

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