Service manual

16 Agilent 85309A H20, H21 Operating and Service Manual Modification
Revised Operations
Revised Operations
The following modifies the “Operations” section of the Agilent 85309A
Operating and Service Manual, page 3-2 through 3-4.
Front and Rear Panel
Feature Changes
A green LED on the instrument’s front panel (left side) indicates which
measurement band has been selected. LED ON indicates HIGH BAND has
been selected and LED OFF indicates LOW BAND has been selected.
Figures 1 and 2 show typical front and rear panels.
By setting the front panel BAND SELECT switch to the EXTernal position
for automated control, the rear panel SELECT port can be used to perform
band selection. A TTL High (+5 V), LED ON, selects HIGH BAND and a
TTL (0 V), LED OFF, selects LOW BAND.
Figure 1 Typical front panel
Figure 2 Typical rear panel