Manual Ranging; Auto Ranging Over The Front Panel - Keithley 3700 series Reference Manual

Section 4: Range, Digits, Rate, Bandwidth, and Filter
Function
CNT (continuity)
CSΩ (common-side ohm)
Frequency and period
Frequency measurements from 3Hz to 500kHz, and period measurements from 2µs to 333ms,
can be made on the ACV ranges.
Temperature
There is no range selection for temperature measurements. Temperature measurements are
performed on a single, fixed range. Depending on the sensor, the maximum temperature
readings range from -200°C to 1820°C.

Manual ranging

To change range, press the RANGE ▲ or ▼ key. The instrument changes one range value of
the active function per key press. The selected range is displayed in the attribute list on the
second line of the font panel display. Note that the manual range keys have no effect on
temperature measurements.
If the instrument displays the ―Overflow‖ message on a particular range, select a higher range
until an on-range reading is displayed. For best accuracy and resolution, use the lowest range
available that does not cause an overflow.

Auto ranging over the front panel

To enable auto range, press the AUTO key. The AUTO annunciator turns on when auto ranging
is selected. While auto ranging is enabled, the instrument automatically selects the best range to
measure the applied signal. Auto ranging should not be used when optimum speed is required.
NOTE
Up-ranging occurs at 120% of range. The Series 3700 will down-range when the reading is
<10% of nominal range.
To disable auto ranging, press the AUTO key. This will leave the instrument on the present
range.
You can also disable auto ranging by pressing the ▲ or ▼ key, however this may cause a range
change.
4-2
Ranges
1k
Threshold adjustable 1 to
1000
1, 10, 100, 1k, 10k,
100k, 1M, 10M, 100M
The AUTO key has no effect on temperature measurements.
Series 3700 System Switch/Multimeter Reference Manual
Maximum reading
120M
Document Number: 3700S-901-01 Rev. A / August 2007