Diode Measurements ( ) - Philips PM2521 Gebrauchsanleitung

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6.4.1.7. Diode measurements ( -►(- )
GENERAL
Diodes can be measured in two ways viz.:
— Diode measurements (Standard method).
— Diode measurements in relative reference mode.
The relative reference mode offers the possibility to select a predetermined relative reference zero level.
Each subsequent reading will indicate the positive or negative deviation from the relative reference value.
Example:
Measured diode value is e.g. 0.6200 V.
In relative reference mode 0.6200 V will be displayed as 0.0000 V. The subsequent measured diode values are
e.g. 0.6225 V and 0.6175 V. The values displayed will be respectively +0.0025 V and —0.0025 V. In this way
it is possible to compare diode junctions.
DIODE MEASUREMENTS (STANDARD METHOD)
— Select function diode -►!- with the function selector.
Remark:
The diode function has only one range.
The value displayed is the voltage in forward or/reverse direction across the diode in the 2 V range.
— Connect the diode to the 0 and V-J2-mA terminal according the table below.
Reading
Forward Reverse
Si
Ge
0.6000 - 0.9000 V
0.1000 -0.3000 V
OL
OL
0 -» V
fcj
rS\
0 V
c* /«V
^ w\
(g)
n
DIODE MEASUREMENTS IN RELATIVE REFERENCE MODE (ZERO SET)
— Measure the diode as described above.
— Depress pushbutton ZERO SET.
* Remark:
The display will be held for one second and a Z will appear on the right-hand side of the display. The value
which is on the display during this one second is the relative reference value. After this one second the display
jumps to zero and the indication ZS will appear on the display. The PM 2521 has now been switched to the
relative reference mode (ZERO SET). In the relative reference mode the PM 2521 switches to manual ranging *.
Each subsequent reading will indicate the positive or negative deviation from the relative reference value.
— To leave the relative reference mode, depress pushbutton ZERO SET again.
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