Transformator - R&S HZ-9 Manual

R&S HZ-9

4.1.4 Transformator

Danger of shock hazard
For measurements in circuits with voltages V (RMS) > 30 V, suitable measures (e.g.
appropriate measuring equipment, fusing, current limiting, electrical separation,
insulation) should be taken to avoid any hazards.
When the power supply has no load and 115 V or 230 V supply voltage is present,
approx. 19.3 V AC should be present on connector X3 (see Fig. 7) on the regulator
board between pins 1 and 2 and between pins 4 and 2. Since the waveform at this test
point is not an ideal sinusoidal curve due to the bridge rectifier that is connected
downstream, these voltage values are rough values as will be displayed on a
multimeter.
If the voltages at X3 correspond more or less to the values given above, then the
defect is probably in the regulator board or the Tuchel socket. In this case, verify
whether +10 V is present on connector X2 on the regulator board (see Fig. 8) between
pins 2 and 4 and –10 V between pins 6 and 4. If this is the case, then the Tuchel
socket must be exchanged. Otherwise, the regulator board must be exchanged.
Fig. 7 Input regulator board
Fig. 8 Output regulator board
If the voltages on X3 deviate significantly from the values listed above, there is a defect
in either the regulator board or the transformer. In this case, the regulator board should
be exchanged first. If this does not correct the problems, the transformer must also be
exchanged.
Manual 1316.4969.02 - 01
Service
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