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Operating and Maintenance Instructions – 20

Setting Operating Mode and Using the Attenuator

The attenuator functions in Attenuation (ATT) mode or in output Power (PWR) mode.

In ATT mode, the attenuator displays attenuation in dB. Normally, the attenuation displayed on

the front panel is relative to the 0 dB reference position of the attenuating optical filter inside

the attenuator. However, the display-offset feature of the attenuator can be used to account

for insertion and connection losses and the adjusted attenuation value displayed.

In PWR mode, the attenuator displays the optical output power in dBm. The attenuator has no

power measurement capability; but using the calibration methods described in Setting the

Calibration Wavelength and Setting the User Slope sections, the user can match the power

level displayed by the attenuator to an external power meter.

To power up the unit:

1. Connect the attenuator to the AC power source, using the AC power cord provided.

2. Set the power switch to

(on), and observe the power-up sequence. The attenuator always

powers on in ATT mode. All key lamps and status LEDs light. The version number of the

software is displayed briefly. The calibration wavelength in nm (XXXX), and the attenuation

(YY.YY dB) are displayed, for example, XXXX YY.YY dB.

The command set (YYY), the message terminating sequence <CR> <LF>, or <CR> or

<LF> (TR), and the GPIB address (AD; a number between 1 and 30) are also displayed.

An example is YYY (TR) AD. The status of the beam block (BLK) and the attenuation in

dB (XX.XX) are displayed, for example, BLK (XX.XX). If a malfunction is detected, an error

message is displayed.

If an offset setting was entered and used before the last power-down, the OFFS status

LED is lit, and the attenuation displayed is the offset value. If the offset value is 0, the

attenuation displayed is 0.00 dB.

To set the operating mode to ATT or PWR mode:

1. Press the ATT/PWR key to toggle between Attenuation and Power modes. When switching

back from OFFS or λ (wavelength) mode, the last operating mode used (ATT or PWR) is

activated when ATT/PWR is pressed. The attenuator displays results in dB when in ATT

mode and in dBm when in PWR mode.

To use the attenuator:

1. Connect the device under test to the unit (Figure 9).

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JDS Uniphase HA9 Series User Manual

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