Using The Photodetector - New Focus 1621 User Manual

162x nanosec revB.fm Page 7 Friday, August 17, 2001 5:51 PM

Using the Photodetector

1. Check the battery voltage. The Model 162X is
2. Mount the photodetector. Use the 8-32 thread
3. Connect the detector output. Connect your
4. Turn the power switch to "on." The output
5. Align an optical beam onto the detector.
6. Select the load. Use the black switch on top of the
7. Turn the detector off. When you are finished
Nanosecond Photodetectors
powered by a single 9-volt alkaline battery. To
check the battery condition, push the red power
switch to the BATT CHK position. If the green LED
lights up, the battery is in good condition; if the
LED does not light, the battery needs to be
replaced (see page 10).
(M4 for metric versions) on the bottom of the
casing to mount the photoreceiver to a post or
pedestal.
The threading is seated in a non-conductive plastic pad to
reduce the electrical noise associated with ground loops. Be
careful not to over-tighten when attaching the casing to a
post or pedestal, or the threaded insert can strip out of the
plastic pad.
voltmeter, oscilloscope, or other instrument to the
Output BNC connector on top of the detector.
voltage should register on your scope or
instrument.
Be careful to keep the optical power under the
maximum optical power of 50 mW to avoid dam-
aging the photodetector.
detector to set the load to 50 Ω , 10 k Ω , or Open .
(Select Open if you are providing an external load
resistor. See "Supplying your own load resistor" on
page 9.)
with the detector, return the power switch to the
"off" position.
Operation • 7