Front panel operation 15
NOTE No Pulses Detected message
If no pulses are detected, current will not be measured (i.e., -----A), and the “NO
PULSE” message will be displayed. The “NO PULSE” message is displayed with
dashes or the last valid pulse reading. Dashes are shown if the pulse-current
measurement settings are not appropriate for detecting pulses. The last valid pulse
is shown if the pulse disappears while taking readings and no change in pulse
settings was made.
Pulses are not detected with the output OFF. With the output ON, pulses will not be
detected if the trigger level is too low or too high. Adjust the trigger level as neces-
sary and toggle back to the display mode until pulse measurements are displayed.
NOTE
If possible, the user should always use an oscilloscope to determine the timing and
transient characteristics of a DUT. The waveform information is very useful in
setting up the Model 2306, reducing setup time, and achieving maximum
performance and productivity. The voltage and current characteristics of the DUT
can be determined with a two-channel oscilloscope, a 0.1 ohm resistor used as a
current sense resistor, and a voltage probe at the DUT as shown in Figure 8.
Figure 8
Circuit — determining the dynamic voltage and current characteristics of a DUT
NOTE
Figure 8 contains a simple circuit for determining the dynamic voltage and current
characteristics of the DUT using a 2-channel oscilloscope, a 0.1 ohm resistor used
as a current sense resistor, and a voltage probe at the DUT.
Quick Disconnect
Connector
External Test Circuit
DVM +
DVM -
Source +
Source -
Sense +
Sense -
Source +
Source -
DVM input
Model 2306
source input/output
DUT
Twisted pair
0.1W Current
sense resistor
Channel 1
Channel 2
Oscilloscope
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