8 • Operation
NEW FOCUS, Inc.
conditions with low light levels and a high impedance
load attached to the BNC connector, the photoreceiver
draws about 20 mA from the batteries, and the battery
lifetime is approximately 24 hours.
To check the condition of the battery:
1.
Turn on the photoreceiver using the power switch.
2.
Set the
Low Frequency
adjustment to
DC
.
3.
Set the
Gain
to
3x10
4
.
4.
Focus at least 1 µW of optical power on the
detector (or place the detector in front of a desk
lamp).
The output should be greater than 7 V. If it is not,
replace the batteries with fresh ones.
Replacing the Batteries
The Model 205X is shipped with two fresh 9-V
batteries installed. To avoid confusion due to low
batteries, replace the batteries on a monthly basis
when the receiver is in frequent use, or use an external
linear power supply such as the New Focus
Model 0901.
1.
Turn off the receiver using the power switch.
2.
Use a Phillips-head screwdriver to remove the
two screws on the back panel of the photo-
receiver.
3.
Remove the back panel.
4.
Replace the used 9-V batteries with fresh ones.
5.
Replace the back panel and the two screws.
6.
Recheck the battery level as described above.
205x 10MHz Adj Rcvr revA.fm Page 8 Monday, January 10, 2005 9:29 AM
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