Sencore FE149 - Page 6

АС
ЕНЕРІ ш 1
VOLTAGE
.5У 1.5У 5V 15V 50V 150V 500V 1500У
1.4РР 4.5РР 14РР 45РР 140РР 450PP 1400PP 4500РР
-10DB
ODB
10DB
2008
3008
4008
5008
6008
READING AC VOLTS: То read AC volts on the FE149, the AC voltage button оп the
FUNCTION switch and the desired button onthe RANGE switch are depressed for the
voltage to be measured. For RMS voltages the two black scales below the mirror
on the meter marked AC (V/MA) are used. For peak to peak, the two red scales
just below the AC RMS scales are used. The readings are multiplied in the same
way as the DC scales to obtain the actual voltage present. On the zero to .5 scale,
each mark is equal to . 01 and on the zero to 1. 5 each mark is equal to . 05. volts.
On the zero to 1. 4 volts peak to peak scale, each mark is equal to . 05 volts and on
the zero to 4.5 volts peak to peak each mark is equal to .1 volts. e
OHMS
ПЕЕ а у сы не наша CREE
Rx1 Rx10 Rx100 RxIK RxIOK RxIOOK RxIM Rx10M
ESSERE Ses] раар
READING OHMS: То readresistance with your ЕЕ149, depress the OHMS button on
the Function switch and depress the Range button for the desired resistance range
to be measured. After checking to see that the meter is "zeroed" at the left edge
of the scale, short the leads together and adjust the OHMS ADJ control for a full
scale deflection of the meter or O ohms. Unshort the leads and be sure that the
meter returns to the extreme left of the scale. Place the unknown resistance between
the FE149 leads and read the resistance onthe OHMS scale (top red scale on meter).
Multiply the reading on the meter by the range used to obtain the actual value of
resistance measured. For example, if the meter read 15 and the R X 100 Range
button isdepressed, the actual resistance would be 15 x 100 or 1500 ohms. NOTE:
For greatestaccuracy when using the R X 10 meg rangeit is best to make the meter
zero adjuston the R X 1 meg range. Thendepress the R X 10 meg button and make
your measurement.
CAUTION: If you use an ohmmeter to check transistors, do notuse the R X 1 range
ofthe ЕЕ149, Because of the low resistance that the ЕЕ149 will measure, the current
onthis range may damage a transistor if used to check the front to back ratio of the
junctions. Use the higher ranges such as the RX100 or above. А better check on
transistors can be made by using a transistor tester such as the Sencore TR139,
TR15A, or ТЕ151. These testers will test the transistor both in and out of circuit
without any possible damage to the circuit or transistor if accidentally connected
wrong.
MEASURING DC CURRENT: To measure DC current, the plusor minus DC current
button is depressed and the desired range button for the current range to be measur
The FE149 does not have to be turned on for the measurement of DC current a
may be left in the off position if so desired. The leads of the FE149 are connected
in series with the circuit being measured and the current read on the DC(V/MA) scale
of the meter. For the 150 microamp, 1.5 Ma, 15Ma, and 150 Ma ranges, the Oto
1.5 scale is used. For the 150 microamp range, the reading is multiplied by 100
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