Agilent-technologies 83438A Manual do Utilizador descarregar pdf (Página 71)

5-17

Servicing

Troubleshooting

To check the A2A2 Laser Modulation Board Assembly

Check the +5V supply by probing the center pin of J11. The modulation input

cable from the rear panel connects to this jack.

Check the –15V supply by probing any of the three resistors that are located

next to J2. These resistors are loaded in a straight line and have the label “1471”

printed on them.

Locate the large 3W black resistor on the assembly that is closest to the pump

laser.

Measure the voltage on the end of the resistor that is furthest from the pump

laser. The voltage should measure approximately –1V to –2V.

The pump laser is being driven by the current source and should be turned on.

Press the front-panel

ACTIVE

key so that the front-panel

ACTIVE

light is turned

off. The voltage measured at the 3W resistor should now be approximately

+0.7V.

The pump laser is turned off.

If the voltage measured across the resistor is incorrect, return the instrument

to Agilent Technologies for servicing.

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Agilent-technologies 83438A Manual do Utilizador Página 71