Lightwave Communications LDX-3232 manual Connecting to the Laser, Power On State

C H A P T E R 2

O P E R A T I O N

Connecting to the Laser

The Power On State

You can choose to "clear" the last saved state by recalling the default values. These values are stored in BINS to that you can save or recall instrument configurations (described in more detail in Chapter 5). "BIN 0" contains all of the default configurations listed in Table 2.1.

Note: If the instrument cannot successfully complete the power on test, an error message of E-512 or E-513 will be displayed on the Display. See Chapter 3 for a list of error codes and actions to take when your instrument indicates these errors.

Table 2.1 LDX-3232 Default Settings

GPIB mode in LOCAL via front panel, or in REMOTE via GPIB

PARAMETERS not selected

CAL PD = 0 µA / mW

LIM I (high range) = 1000 mA

LIM I (low range) = 500 mA

LIM V = 15 volts

LIM P = 5000 mW

Output off

DISPLAY enabled, in I mode

Constant I, low bandwidth mode selected

I setpoint = 0 mA

IPD setpoint = 0 µA

PPD setpoint = 0 mW

RECALL BIN number = 0

Connecting to the Laser

When connecting your laser to the LDX-3232, we recommend that the instrument be powered up with the output off. In this condition, a low impedance shunt is active across the output terminals. When disconnecting devices, it is only necessary to turn the current source output off.

It is also recommended that the connections to the LDX-3232 output be made using twisted wire pairs with an earth-grounded shield (see Figures 2.1 - 2.4). The output terminals of the instrument are left floating relative to earth ground to suppress AC power-on/power-off transients that may occur through an earth- ground path. If the output circuit is earth-grounded at some point (such as through the laser package and mount), the user must be careful to avoid multiple earth

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