Simpson 460 4 Series - DC Current Measurements

Operation
voltage sensitive (for example, semiconductors), careful
considerations must be given when making connections
and selecting the resistance range (Table 4-3).
g. Allow time for the display to stabilize. This procedure is espe-
cially important when measuring a high value resistance shunted
by a large value of capacitance.
h. Disconnect test leads.
4.8 DC CURRENT MEASUREMENTS:
a. Review Safety Precautions in paragraph 4.2.
b. Depress the DC mA function switch.
c. Depress the appropriate current range switch as indicated in
Table 4-4. If the current being measured is unknown (but less
than 10A), begin with the 20 (10A) switch. Connect the red
test lead to the 10A jack and the black test lead to the COM-
MON jack.
d. Remove all power to the circuit being measured and discharge
all capacitors.
e. Connect the test leads according to Table 4-4.
f. Open the circuit in which the current is to’ be measured and
securely connect the test leads in series. Ensure that the 460-4
is not connected across a voltage source which can exceed
ratings of the Instrument.
. Apply power to the circuit being measured.
. The value of the current being measured is indicated on the
numerical display. The analog display can be used for nulling
or peaking applications.
i. Remove all power from the circuit being measured and dis-
charge all capacitors.
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4-9