Models 2500 and 2502 User’s Manual Range, Digits, Speed, and Filters 6-3
Auto ranging
Press the MSR1 or MSR2 key, then press AUTO RANGE to enable auto ranging on chan-
nel 1 or channel 2 respectively. The AUTO annunciator turns on when auto ranging is
selected. With auto ranging selected, the instrument automatically chooses the best range
to measure the applied signal. In 2-channel, RATIO, or DELTA display modes, the AUTO
annunciator appears if either channel is in auto range. Pressing the AUTO key in the 2-
channel display mode toggles auto range on both channels ON or OFF.
NOTE With the median filter enabled, auto ranging could be very slow. See “Median
filter,” page 6-8 for details.
Auto range limits
Upper and lower auto range limits are included to support the auto range change mode.
The upper limit must be greater than or equal to the lower limit, and the lower limit must
be less than or equal to the upper limit. If the lower limit is equal to the upper limit, auto
ranging is effectively disabled. When auto ranging is disabled, you can manually change
to any range below the lower limit or any range above the upper limit.
Setting auto range limits
To set the upper or lower auto range limit, press CONFIG
or CONFIG respectively,
then use the manual RANGE keys to set the limit at the ULIMIT or LLIMIT prompt.
Auto range speed limitations
With auto range enabled, a minimum of two extra readings are required to move up range,
and one additional reading is needed to move down range. No additional readings are
required if no range change is required.
Auto range operation with range limits
The auto range limits are only evaluated when an auto range condition exists and forces
the limits to be re-evaluated. Only the upper limit is evaluated if the unit needs to up-
range; likewise, only the lower limit is evaluated if the unit needs to down-range. Both
limits are not checked simultaneously for any given auto range evaluation.
For example, if the unit is on a higher manual range that is above the programmed upper
range limit and auto range is then enabled, the unit will not re-evaluate the range limits
until a change in the input signal level forces a range change. In this example, the unit
would stay on a range above the programmed upper limit with auto range enabled until the
input signal level changes accordingly.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
To Next Page
Loading...
Need help?
General
