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ProcessMeter
Measuring Electrical Parameters
17
Measuring Electrical Parameters
The proper sequence for taking measurements is as
follows:
1. Plug the test leads into the appropriate jacks.
2. Set the rotary knob.
3. Touch the probes to the test points.
Input Impedance
For the voltage measurement functions, input impedance
is 10 MΩ. See the specifications for more information.
Ranges
A measurement range determines the highest value the
meter can measure. Most meter measurement functions
have more than one range (see the Specifications).
Being in the right range is important:
• If the range is too low, the display shows OL
(overload).
• If the range is too high, the meter will not be
displaying its most accurate measurement .
The meter normally automatically selects the lowest
range that will measure the applied input signal (Auto
showing on the display). Press Kif you want to lock
the range. Each time you press K, the meter
selects the next higher range.
If you have locked the range, the meter resumes auto
ranging when you change to another measurement
function or you press K and hold it for 1 second.
Measuring a Composite Signal
Because the input is dc-coupled, to meaure an ac voltage
or frequency with a dc bias, you must manually select the
range specified in Table 7. For example, to measure 100
mV ac with 20 V dc superimposed, select the 4 V range.
Table 7. Range Requirements for Measuring a
Composite Signal
Range (ac) Max. Allowable AC + DC
400.0 mV 3 V
4.000 V 30 V
40.00 V 300 V
400.0 V 400 V
1000 V 1000 V