Conrad 12 79 49 Bedienungsanleitung Seite 13

c) A bar graph is active at the left-hand edge of the screen during capa-
city (but not diode) measurements, being a high-speed analogue indi-
cator. The bar graph operates as a trend indicator.
d) Connect the test probes to the object to be measured and, if required,
follow the following button inputs to select available sub-functions:
REL Press button "F1" to set the present indication to "0", i.e. all the fol-
lowing measurements are with reference to "0 µF". The difference
from the set "zero point" is displayed. During this function the sym-
bol "REL" flashes. To switch off the function, press button F1 once
(flashing stops, REL function off). The REL function is not available
under diode measurement.
REL P-H
F1 F2 F3
RESET RUN PAUSE
P-H In the "Peak Hold" function, the highest ("MAX") and lowest
("MIN") capacity values occurring at any time are captured and indi-
cated. The present measured value always appears In the upper line
of the display (the Peak Hold function can only be called in digital
mode). In the basic menu press button "F2". Peak Hold is not availa-
ble under diode measurement.
For the description of capacity measurement see above.
Press button F4 from within the basic menu to start diode measure-
ment. Connect the test probes to the voltage-free semiconductor
component, diode or transistor. In this process, note that the red test
lead must be connected to the anode and the black test lead to the
cathode. The forward conducting direction will now be measured.
For an intact PN-junction in a silicon diode path, a value between
0.45 and 0.75 VDC appears, while in a germanium diode path a value
between 0.2 and 0.4 VDC appears. If, however, "OVER" (for overlo-
ad) appears instead of a voltage, the diode path is open-circuit or
the test leads reversed. If for transistors a voltage of more than 1 V is
measured, it can be that the transistor incorporates resistors.
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basic menu
F4
F1 F2
F3 F4
EXIT
F1 F2 F3 F4
With light-emitting diodes a forward voltage of approx. 1.4 to 2.2
VDC is measured. Where low current LEDs are concerned, the mea-
surement current is sufficient to cause these to light.
The reverse direction of a diode path is measured with the red test
lead connected to the cathode and the black test lead to the anode.
If as a result of this a voltage value is indicated, the diode is faulty. If
on the contrary "OVER" is indicated, the diode path is high resi-
stance (not faulty). To switch back to capacity measurement from
diode measurement, press button F3.
BLACK
RS232
5.6 mA/µA DC and AC current measurement
(~=mA/µA)
For the measurement of low DC or AC currents up to 400 mA AC rms or
mA DC max., proceed as follows:
a) Set the rotary switch to "~=mA/µA".
b) Connect the black test lead to the measuring instrument "COM"
socket and the red test lead to the "-I(-•-I<-•-mA• SIG•AUX•LOGIC"
socket
c) Connect the test leads in series with the object to be measured (see
following illustration).
~
d) A bar graph is active at the left-hand edge of the screen during mea-
surements, being a high-speed analogue indicator. The bar graph
operates as a trend indicator.
e) If required, follow the following button inputs to select available sub-
functions:
0,529 V
RED
AUTO DIODE
Diode
A
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