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BASIC DMM OPERATION
OPTIONAL SHIELO
-~~-
-
MODEL 196
B.&rward bias the diode by connecting the red terminal
of the Model 196 to positive side of the diode. A good
diode will typically measure between 3OOn to IkQ.
C.Reverse bias the diode by reversing the connections
on the diode. A good diode will overrange the display.
Table 2-3. Resistance Ranges
Maximum Test Lead
6%d
Nominal
Resistance (Q) for
Figure 2-5. Four-Terminal Resistance Measurements
Range 1 Resolutim
I-Short 1 -3 Count Error (Wzd)
I
I
I
MODEL 196
CAUTION:
MAX I MUM INPUT = 300V RMS, 425V PEAK. 1O'V.H.
INPUT
IMPEDANCE = 1Hf-1 SHUNTED BY < 120pF
Figure 2-6. TRMS AC Voltage Measurement
Notes:
*5%d resolution only
NOTE: Typical open circuit voltage is 5V.
2.6.7 TRMS AC Voltage Measurements
The instrument can make TRMS AC voltage measurements
from l$I to 3OOV. To measwe AC volts, proceed as follows:
1. With ohms compensation active (Progam a), the 61 in-
1. Select the AC volts function by pressing the ACV button.
dicator light will blink when the ohms function is
2. Select a range con$stent with the expeqed voltage or use
selected.
autorange.
2. Table 2-3 shows the current output for each resistance
3. Select the front or rear panel input terminals using the
range.
INPUT switch.
3. It helps to shield resistance greater than IOOkQ to achieve
a stable reading. Place the resistance in a shielded
enclosure and electrically connect the shield to the LQ
input terminal of the instrument.
4. Diode Test-The 3kQ range can be used to test diodes as
MlOWS:
A. Select the 3kO range.
NOTE
There is a small amount of offset (typically 150
counts at 5%d) present when using the ACV func-
tion. Do not zero this level o-ut. Paragraph 2.6.10
provides an explanation of AC voltage offset.
4. Connecbthe signal to be measured to the selected input
terminals as shown in Figure 2-6.
5. Take the reading from the display.
2-12
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