48
Agilent U1251A/U1252A User’s and Service Guide
2
Making
Measurements
Testing Diodes
To test a diode, turn the circuit power off, and remove the
diode from the circuit. After that, proceed as follows:
1
Set the rotary switch to
.
2
Connect the red and black test leads to input terminals
and
COM
respectively.
3
Use the red probe lead on the positive terminal (anode) of
the diode and the black probe lead on the negative
terminal (cathode).
4
Read the display.
5
Reverse the probes and measure the voltage across the
diode again. Diode test result is based on the following:
•
Diode is considered good if the meter displays “OL” in
reverse bias mode.
•
Diode is considered shorted if the meter displays
approximately 0 V in both forward and reverse bias
modes, and the meter beeps continuously.
•
Diode is considered open if the meter displays “OL” in
both forward and reverse bias modes.
C A U T I O N
Disconnect circuit power and discharge all high-voltage capacitors before
testing diodes to prevent possible damage to the meter.
N O T E
The cathode is the side with band(s).
N O T E
The meter can display diode forward bias of up to approximately 2.1 V.
Typical diode forward bias is between the range of 0.3 to 0.8 V range.
Summary of Contents for U1251A
Page 34: ...34 Agilent U1251A U1252A User s and Service Guide 1 Getting Started Tutorial...
Page 116: ...116 Agilent U1251A U1252A User s and Service Guide 5 Maintenance...
Page 120: ...120 Agilent U1251A U1252A User s and Service Guide 6 Accessories...
Page 156: ...156 Agilent U1251A U1252A User s and Service Guide 8 Specifications...
