28
Using the Meter With a Computer
Measuring AC Current
Frequency
Note: If the meter is set to measure
current, it cannot measure the fre-
quency of a signal with DC bias.
1. Rotate the function selector
to
/
µµµµ
A/A
ýýýý
for 0.4/4mA and 4/
10A ranges or
/ mA/A
for 40/
400mA and 4/10A ranges.
2. To select the frequency function,
press
Hz/DUTY/WIDTH
once.
3. If necessary, press
RANGE
to
select the manual range, then
repeatedly press
RANGE
until the
desired range appears.
Note: Press
SELECT
twice to set
the meter back to the AC A mea-
surement function.
4. To select the duty cycle or pulse
width function, repeatedly press
Hz/DUTY/WIDTH
until
å
å
å
å
appears
(to select duty cycle) or until
µµµµ
S
or mS
appears (to select pulse
width).
5. If
å
å
å
å
,
µµµµ
S, or mS
appears and you
want to select the frequency
function again, repeatedly press
Hz/DUTY/WIDTH
until
Hz
,
kHz
, or
MHz
appears.
6. Connect the test leads to the
device you want to check in
series.
MEASURING
hFE
You can use the meter to measure
the DC gain of small-signal, bipolar
transistors in the hFE range of 1000.
Caution: To avoid damaging the
meter, do not try to check a transistor
if you do not know its type and pinout.
1. Set the function selector to
hFE
.
2. Unplug both test leads from the
meter, then slide down the guard
on the front of the meter.
3. Insert the transistor you want to
check into the hFE socket on the
front of the meter, matching the
pinout of the transistor with the
labels on the socket. The transis-
tor’s value appears.
ˆ
Using the Meter With a Computer
You can connect your meter to a
computer, letting you conveniently
monitor and record and log data over
a long period of time. You can even
use your meter to display oscillo-
scope information on your computer!
For example, you can record changes
in temperature in a refrigerator or volt-
age changes in a circuit over a long
period of time.
Use the supplied RS-232 cable to
connect the meter to your computer
and the supplied software to display
