Optical Power Meter Model N3970A Operating and Maintenance Guide

■ N3970A OPTICAL POWER METER SOURCE QUICK REFERENCE GUIDE
■ To remove interchangeable connector, move interface to
mid position, and pull off adaptor.
■ To defeat auto power-off, hold POWER for 3 seconds at
turn on until ON and perm are displayed.
■ To access hidden keypad, pull up display cover.
Select POWER, Source, then:
■ To set reference, push Abs/Rel and hold Set Ref for
3 seconds (3 buzzer sounds).
■ To display reference, hold Abs/Rel, so Ref flashes.
■ To stop / start display update, push Hold.
■ If a test tone is detected, meter will display Hz.
AUTOTEST OPERATION
■ No user action is required for meter to enter Autotest
mode.
■ Autotest:
Push Autotest on source and wait a few
seconds.
■ Can also push Autotest on meter for faster lock-on.
■ To display one wavelength only, on the power meter
push the left side of -/+ and again for the other wavelength.
Push right side of -/+ (twice) to exit.
■ Autotest remains for >8 seconds after signal loss, to allow
quick connection change.
■ To e x i t autotest, remove test lead or turn off source for >8 seconds.
MANUAL OPERATION
■ To turn on and select wavelength, push: POWER, Power
Meter, -/+.
■ To display linear mode, push dBm/W.
■ To display max/min values, push MAX/MIN repeatedly.
Hold MAX/MIN to reset (3 buzzer sounds). .
MEMORY
■ Enter Power Meter or Autotest modes first
■ While in Autotest mode, it is only possible to STORE.
■ To clear all memory, push both RECALL and CANCEL
together for 3 seconds. clr will display.
■ To store in next location, push STORE.
■ To change next store location, push SELECT -/+, SET.
■ To recall, push RECALL -/+ to scroll through data.
■ To exit memory display, push CANCEL.
ADDITIONAL AUTOTEST MEMORY OPERATION
■ To read or cancel memory, first exit Autotest mode, and
enter Power Meter mode.
■ Autotest memory: use -/+ to scroll wavelengths.