Elenco Electronics M-1150K, Сборка и инструкция по эксплуатации

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-13-
h
FE
Measurement
Figure 13 shows a simplified diagram of the h
FE
measuring circuit. Here the range switch is in the X10 ohms
position and the transistor circuit takes the place of the external resistor in the ohms measurement. The
higher the h
FE
of the transistor, the more current flows in the external circuit and the lower the effective resis-
tance. The meter reads this resistance and the h
FE
of the transistor may be read on the h
FE
scale.
Figure 13
Specifications
Measurement Ranges Accuracy Remarks
DC Voltage All ranges 3% Input impedance 20K
Ω
/V
(DCV)
AC Voltage All ranges 5% Input impedance 9K
Ω
/V
DC Current 50
µ
A-2.5mA-25mA-0.25A 3% Voltage drop:
10A . . . . . . . . . . . . . . . . . 10% 50
µ
A . . . . . . . . . . 100mV
Others . . . . . . . . . 250mV
Resistance All ranges 3% of arc
Size - 6 x 3 7/8 x 1 1/2 inches
Weight - 0.62 pounds
R19
44K
FUSE
--COM
PNP Transistor
+
R21
200
3V
24K
R25
10K
R24
18K