Getting Started
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Keysight 53147A/148A/149A Operating and Programming Guide
63
Setting the Resolution for Frequency Measurements
Since less time is required to complete each measurement as the resolution of the
measurements is reduced, the resolution setting affects the rate at which
measurements are taken and displayed, as well as the number of digits displayed
for the measurements. As a result, the rate at which the Gate indicator flashes
changes when you change the resolution.
As shown in the procedure in the diagram on the next page, the available
resolution settings are 1 Hz (the default setting), 10 Hz, 100 Hz, 1 kHz, 10 kHz,
100 kHz, and 1 MHz.
NOTE
For most of the instrument’s settings, when you continue to press either the
up-arrow or the down-arrow key when you reach the end of the available
settings, the value for the setting “rolls over” to the value at the opposite end of
the range. For example, if the GPIB address is set to 31, and you press the
up-arrow key, the value changes to one.
However, when you adjust the value in the units position for the number of
measurements to be averaged, rollover does not occur. If you press the up-arrow
when the value in the tens position is zero and the value in the units position is
nine, or if you press the down-arrow when the value in the tens position is zero
and the value in the units position is one, there is no change. If the value in the
units position could roll over (in either direction), it would allow you to set a value of
zero for the number of averages. Since at least one measurement must be taken,
zero is an illegal value.
NOTE
When the resolution setting is high (e.g., 1 Hz), and a large number of averages
is selected, it takes a considerable amount of time for the instrument to take the
measurements, compute the averages, and display a reading. As a result, the
rate at which the display is updated is considerably slower than at small
numbers of averages and lower resolution settings. For example, when the
resolution is set to 1 Hz, and the number of averages is set to 60, a new reading
is displayed every 60 seconds (approximately).
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