Fluke 8808A User Manual page 95

Appendices A
Applications
function selected, number of measurements being made (single measurement when only
the primary display is used, or two measurements when both the primary and secondary
display are used), the input level, range type (autorange or manual range), the
measurement rate (slow, medium, or fast), and whether measurement types are mixed or
not. (Measurements are either ac-type [ac volts or amps] or dc-type [all others]).
Typical response times for a single measurement are shown in Table A-3. For a single
measurement, results are displayed as soon as the correct range is found. However,
additional time needs to be allowed for the measurement to be fully settled in order for
the displayed result to meet the meter's accuracy specifications. This "settling delay"
varies, depending on the differences between the primary and secondary displays.
The settling delay is longer when ac- and dc-type measurements are mixed. Examples of
mixed ac and dc measurements are volts dc and amps ac, and volts ac and amps dc.
Settling times are listed in Table A-4.
Update Rate in the Dual Display Mode
The update rate is the time between successive measurements for a steady state signal. In
the dual display mode (when both the primary and secondary displays are on), if the
measurement functions or the ranges selected for the primary and secondary displays are
different, the update rate for each measurement function will vary from the update rate
for that measurement function when only the primary display is on.
When the secondary display is on, the meter always waits for the measurement to be fully
settled after changing the range or function before displaying a reading. The amount of
delay depends on the functions and ranges selected for the primary and secondary
displays as shown in Table A-4.
Table A-5 lists the interval between measurements when the measurement function or
range of the primary and secondary display differ. These intervals vary by measurement
function, range, measurement rate (slow, medium, or fast), and measurement type (ac-and
dc-type measurements mixed or not mixed).
A-5