Direct Current Measurements - Philips PM2521 Gebrauchsanleitung

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dB MEASUREMENTS IN RELATIVE REFERENCE MODE (ZERO SET)
— Measure the alternating voltage in the dB function as described above.
— Depress pushbutton dB (V~), ZERO SET again.
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 ortthe display during this one second is the relative reference value. After this one second the
display jumps to zero and the indication ZS (ZERO SET) will appear on the display. The PM 2521 has now
been switched to the relative reference (ZERO SET) mode. In the relative reference mode the PM 2521
switches to automatic ranging. Each subsequent reading will indicate the positive or negative deviation from the
relative reference value.
— To leave of the dB function, depress pushbutton dB (V~) ZERO SET again.
Remark:
Take care that the maximum input voltage of 600 V rms is not exceeded. 600 V rms = +57.8 dB.
However, in relative reference mode the relative reference value must be added with the measured value.
6.4.1.4. Direct current measurements (A^^)
— Select function A-r-^ with the function selector;
— Select the manual or automatic ranging mode with pushbutton AUTO/MAN*.
Remark:
Manual ranging is indicated with a * on the display.
In automatic ranging mode the up level is 2020 and the down level is 0180.
— Select in manual ranging mode the correct range with pushbutton UP or DOWN.
Remark:
Available ranges are: mA terminal
2.000 aiA
20.00 aiA
200.0 aiA
2.000 mA
20.00 mA
Overload is indicated with OL on the display (Display > 2100).
In range 20 A overload is also indicated at 21.00 A. However, the maximum continuous input current is 10 A.
— Connect the current source to the 0 and mA or 0.2 A — 20 A terminal
Remark:
The polarity indicated is the polarity of the A terminals with respect to the 0 terminal.
Current up to 31.6 A can be measured with shunt PM 9244. Refer to chapter 6.4.2.2.
Due to the measuring method the display does not indicate zero when the input is short circuited.
0.2 A — 10 terminal
200.0 mA
2.000 A
20.00 A
V