Triplett 9045 - Manual (Page 22)

22 Triplett Model 9045
7.2.3 DC Current Measurement
WARNING!!!
If the magnitude of the current to be measured is unknown, always start by
setting the meter to the highest range, and then to lower ranges,
until a satisfactory reading is obtained.
Do not rotate the FUNCTION switch with the input applied to the meter.
If the input current is higher than 10A, do not attempt to measure!
Use caution when measuring current in a circuit with voltages
above 50 VDC. Do not use meter to measure current in circuits
whose voltage exceeds the voltage rating of the meters’ fuses.
7.2.3.1 Connect the black test lead to the COM jack. Connect the red test lead to
the 10A jack unless it is known that the input current is less than 600mA or
6000uA. If the current is less than 6000uA or 600mA, connect the red test
lead to the uA/mA jack.
7.2.3.2 If the red test lead is inserted into the 10A jack, set the FUNCTION switch
to the 10A position. Connect test leads in series with circuit to be measured.
Read the value of the current on the LCD display.
7.2.3.3 If the red test lead is inserted into the uA/mA jack, set the FUNCTION
switch to the uA or mA position. Connect test leads in series with circuit to
be measured. Read the value of the current on the LCD.
7.2.3.4 If the display indicates overrange, i.e. “OL”, disconnect the test probes
from the circuit and reconnect the red test lead to the 10A jack. Set the
FUNCTION switch to the 10A position, and reconnect the test leads to the
circuit. Read the value from the LCD. If the input current exceeds the mea-
surement capability of the meter, as evidenced by a display of over 10 amps,
or an overrange display, it should not be measured.
7.2.3.5 If the displayed value is less than “600” (decimal point not shown), a
more accurate reading may be obtained by setting the FUNCTION switch to a
lower range and using a different jack. Disconnect the probes from the
circuit and rotate the FUNCTION switch to the next lower position. Recon-
nect the test probes to the circuit and observe the reading on the LCD dis
play. If the FUNCTION switch is already on the lowest position (i.e. uA), no
greater measurement resolution can be obtained.
7.2.3.6 To set the range manually, press the RANGE button, repeatedly if neces-
sary, to select the desired range. Observe the position of the decimal point
and the annunciators to identify the selected range.