EG&G ORTEC 535 Посібник з експлуатації та обслуговування - Сторінка 8

Переглянути онлайн або завантажити pdf Посібник з експлуатації та обслуговування для Підсилювач EG&G ORTEC 535. EG&G ORTEC 535 10 сторінок. Quad fast amplifier

Друкувати сторінку

MAINTENANCE AND CALIBRATION

6.1.

PREVENTIVE MAINTENANCE

Give reasonable attention to mechanical details. Keep the

signal connectors clean at all times. Periodically remove

the cover and inspect the interior of the module for dust

accumulation or other undesirable conditions. Glean as

often as required by local conditions (normally about

once every 12 months).

6.2.

CORRECTIVE MAINTENANCE

Corrective maintenance generally consists of replacing

defective components (i.e., resistors, capacitors, diodes,

transistors, and integrated circuits), replacing missing

hardware, and tightening loose hardware. Do not use

excessive force when tightening screws or nuts.

When replacing components on a PWB, be sure that the

board is not damaged by excessive heating. When un

soldering leads, grip the lead that is to be removed with

pliers or some similar tool that acts as a heat sink. Heat

the solder joint as little as possible while maintaining a

steady pull on the lead to assure its prompt removal.

Remove excess solder from the board with a solder-puller.

Do not redrill holes in the PWB since many are plated

through the board. If the integrity of a. plated-through

hole is in doubt, solder the component lead on both sides

of the board.

When a defective component is to be removed from a

PWB, the preferred method is to cut both or all leads to

the component and then remove each of the leads from

the board.

6.3.

CALIBRATION

Follow this procedure to adjust all controls of each

channel of the 535. Since all four channels are identical,

only channel 1 will be discussed.

1. Furnish power to the unit for at least ten minutes.

2. Use 50 O cable to connect the In connector of the 535

to a digital voltmeter. Adjust R4 (mounted on the PWB) as

needed to set the input dc level at 0 V ± 1 mV.

3. Use 50 Q cable to connect the Out connector of the

535 to a digital voltmeter. No connection should be made

to the In connector. Adjust R12 (front panel) as needed to

set the Out dc level at 0 V ± 1 mV.

4. Using 50 O cable, connect a 1 ns rise time pulser

(HP215A Pulser or.equivalent) to an oscilloscope with a

500 MHz bandwidth (Tektronix 7904 mainframe and 7A19

vertical plug-in unit or equivalent). Set the oscilloscope

input impedance to 50 Cl. Adjust the HP215A output to

-500 mV.

5. Using 50 O cable, connect the output of the pulser

to the In connector of the 535. Oonnect the Out connector

of the 535 to the 500 MHz oscilloscope. Set the oscillo

scope input impedance to 50 Q. Adjust the Gain (front

panel) potentiometer of the 535 to produce a -5 V output

signal. Adjust the BDW (front panel) potentiometer of the

535 to produce a 3.1 ns rise time signal. This sets the rise

time of the 535 to 3.0 ns.

6. Reverse the polarity of the pulser and repeat steps 4

and 5 for positive signals.

7. Set the oscilloscope Oal output to some convenient

value such as 1 kHz, 0.4 V. Set the oscilloscope vertical

input to DO. Observe the oscilloscope Oal signal which

should be a square wave. Using 50 O cable, connect the

Oal signal to the 535 In connector. Using 50 Q cable,

connect the 535 Out connector to the oscilloscope input.

Adjust R9 (mounted on the PWB), the Tilt Adj, as needed

to produce a square wave output from the 535. The ad

justment of R9 equalizes the gain of the fast loop and the

slow loop within the hybrid amplifier A1.

6.4.

FACTORY REPAIR

This instrument can be returned to the EG&G ORTEO

factory for service and repair at a nominal cost. Our

standard procedure for repair ensures the same quality

control and checkout that are used for a new instrument.

Always contact the Oustomer Services Department at

EG&G ORTEO, (615) 482-4411, before sending in an

instrument for repair to obtain shipping instructions and

so that the required Return Authorization Number can be

assigned to the unit. Write this number on the address

label and on the package to ensure prompt attention when

it reaches the EG&G ORTEO factory.