Fluke 28IIEX Fluke 28IIEx User Manual - Page 40

high-voltage capacitors. Remove the Product and, restore the circuit to normal operation.

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28 II Ex Users Manual 3. If you use the A terminal, set the rotary switch to mA/A. If you use the mA/μA terminal, set the rotary switch to  for currents below 6000 μA (6 mA), or P for currents above 6000 μA. 4. To measure dc current, push . 5. Open the test circuit path. Touch the black probe to the more negative side of the break. Touch the red probe to the more positive side of the break. If the leads are reversed, the measurement will be negative, but will not cause Product damage. 6. Apply power to the circuit and then read the display. Be sure to note the unit given at the right side of the display (μA, mA, or A). 7. Remove power from the circuit and discharge all high-voltage capacitors. Remove the Product and restore the circuit to normal operation. Some guidelines for current measurements are: • If the current measurement is 0 A and you are sure the Product is set up correctly, do a fuse test. See the "Fuse Test" section. • A current meter drops a small voltage across itself, which could change circuit operation. You can calculate this burden voltage with the values shown in the specifications. 30

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28 II Ex
Users Manual
30
3.
If you use the
A
terminal, set the rotary switch to
mA/A. If you use the
mA/
μ
A
terminal, set the rotary
switch to
for currents below 6000
μ
A (6 mA), or
P
for currents above 6000
μ
A.
4.
To measure dc current, push
.
5.
Open the test circuit path. Touch the black probe to
the more negative side of the break. Touch the red
probe to the more positive side of the break. If the
leads are reversed, the measurement will be
negative, but will not cause Product damage.
6.
Apply power to the circuit and then read the display.
Be sure to note the unit given at the right side of the
display (
μ
A, mA, or A).
7.
Remove power from the circuit and discharge all
high-voltage capacitors. Remove the Product and
restore the circuit to normal operation.
Some guidelines for current measurements are:
•
If the current measurement is 0 A and you are sure
the Product is set up correctly, do a fuse test. See
the "Fuse Test" section.
•
A current meter drops a small voltage across itself,
which could change circuit operation. You can
calculate this burden voltage with the values shown
in the specifications.