30 seconds every 15 minutes; pause 1 minute after each
measurement of such a large current.
(1) Remove power from the circuit to be tested and
discharge all high-voltage capacitors.
(2) Turn the rotary switch to one of the
or
positions, depending on the type and amplitude of the
current you expect to encounter. If you are unsure
what type to expect, select one of the
positions.
If you are unsure what amplitude to expect, select
the
10
position.
(3) Plug the black test lead into the black
COM
jack at the
bottom left of the front panel.
(4) Plug the red test lead into the red/yellow
10A
jack,
red
jack (DMM52FSG) or red
jack
(DMM53FSG) on the front panel. Choose the
10A
jack
if you have set the rotary switch to the
10
position,
and the
or
jack if you have set the rotary
switch to one of the
or
positions.
(5) Break the circuit and connect the test leads across
the break. Connect the red lead to the higher-voltage
side of the break and the black lead to the lower-
voltage side.
(6) Re-apply power to the circuit and observe the display.
If it shows
1.
, the current amplitude is beyond the
selected current range. If that is the case, move the
rotary switch to the next-widest position. When
measuring DC current, if the readout is a negative
value the leads are reversed, but the absolute value
represents a valid measurement of current amplitude.
(7) Remove power from the circuit and discharge all
high-voltage capacitors.
(8) Disconnect the test leads and restore the circuit to its
original condition by eliminating the break you made
in Step 5.
8
DMM52&53FSG Manual_R1-FINAL-102114_Layout 1 11/21/14 12:03 PM Page 8
