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Operation
5-11
Figure 5-8
Configuration for current gain and common-emitter test
In order to perform the current gain test, the voltage source
is first set to the desired value of V
CE
. The current source is
then set to a base current value that will result in the desired
value of I
C
as measured by the DMM. The current gain can
then be calculated as outlined in the previous paragraph.
In order to reduce errors caused by voltage burden, use a
higher current range on the Model 2000 DMM. Doing so
will result in the loss of one or two decades of resolution,
but 3 1/2
or 4 1/2-digit resolution will probably be adequate
for most situations.
HI
LO
POWER
1
Dual 1x12 MUX
DUT (12)
12
1
12
1
12
HI
LO
Model 224
Current Source
Model 2000
DMM
Model 230
Voltage Source
Measure
I
Source
V
Source
I
B
C
E
B
C
E
C
CE
B
Output
A. Test Configuration
Amps
Output
Common
7021
Note: Bank B channels 13 through
18 are not used.
V
DUT
I
C
CE
V
+
-
224
Current
Source
2000
DMM
230 Voltage
Source
B. Simplified Equivalent Circuit
I
B
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Summary of Contents for 7021
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