User`s guide

Chapter 2 Front Panel Operations RIGOL
M300 User’s Guide
2-23
To Set the Range
The setting modes of range include “Auto” and “Manual”. In auto range mode, the
instrument selects the proper range for each measurement according to the input
signal automatically. In the manual range mode, users can select a fixed range for
each channel. Auto ranging is convenient and manual ranging provides faster
scanning because some additional time is required for the instrument to make a
range selection in auto range mode.
Enter the first step of the channel configuration guide, select the desired channel
number and function, use the up/down direction keys to select Range and use the
left/right direction keys to select the desired range. The ranges available for each
function are as shown in the table below.
Table 2-2 Range
Function
Range
DCV/ACV
Auto, 200 mV, 2 V, 20 V, 200 V, 300 V
[1]
DCI/ACI
Auto, 200 μA, 2 mA, 20 mA, 200 mA, 1 A
2WR/4WR
Auto, 200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 1 MΩ, 10 MΩ, 100 MΩ
FREQ/PERIOD
[2]
Auto, 200 mV, 2 V, 20 V, 200 V, 300 V
Note
[1]
: for channels on MC3232 and MC3264, the maximum range of DCV/ACV is 150 V.
Note
[2]
: in frequency/period measurement, the range set is the voltage range of the signal under
test and is used to calculate the measurement resolution. The measurement range of
frequency/period is from 3 Hz to 1 MHz (1 μs to 0.33 s).
Key Points:
 Auto range threshold:
For signal under test with voltage/resistance that is between 10%*Range and
110%*Range, the instrument selects Range as the current range automatically.
For example, the signal under test for DCV measurement is 5 V (between
10%*20 V and 110%*20 V), the 20 V range is selected automatically.
 If the input signal is greater than the current range, the instrument gives an
overrange indication.
 At power-on or after a reset, the range is “Auto” by default.
 “Auto” range is recommended when it is hard to predict the measurement range
to protect the instrument and acquire more accurate data.
 For temperature measurements, the instrument internally selects the range. It is
not user selectable. For thermocouple measurements, the instrument internally
selects the 200 mV range. For thermistor, RTD and RTD 4W measurements, the
instrument will autorange to the correct resistance range.