Ac/Dc Current (A) - Fluke 8062A Instruction Manual

When taking measurements in the high impedance dc voltage
function, do not select any ranges except the 2V or 200 mV ranges.
Measurement in other ranges will result in erroneous readings.
When the high impedance dc voltage function is selected and no
inputis applied, noise from the environment (such as rf or power
line noise) may cause the 8062A to display OL (overrange).

2-16. AC/DC Current (A)

Selection of the ac or dc current (A) function is described in Figure 2-10.
The 8062A offers five ac (true rms ac-coupled) and five dc current ranges:
200 A, 2 mA, 20 mA, 200 mA, 2000 mA. Each range is protected by a
2A/250V fuse in series with a 3A/600V fuse.
When a meter is placed in series with a circuit to measure current, you may
have to consider an error caused by the voltage drop across the meter (in this
case, across the protective fuses and current shunts). This voltage drop is
called the burden voltage. The maximum full-scale burden voltages for the
8062A are 0.3V for the four lowest ranges and 0.9V for the highest range.
These voltage drops can affect the accuracy of a current measurement if the
current source is unregulated and the resistance of the shunt and fuses
represents a significant part (1/1000 or more) of the source resistance. If
burden voltage does present a problem, you can calculate the error by using
the formula in Figure 2-11. You can minimize this error by selecting the
highest current range that provides the necessary resolution.
Operation Instructions
Note
Note
2
Operation
2-15