HP 120A - Page 32

Sect. II Page 16
CONNECTING EXTERNAL CONDENSERS TO EXTEND SWEEP TIME
To extend the sweep time, remove chassis from
cabinet,
1. Connect external condenser across condenser
shown on SWEEP TIME/CM switch.
2. Connect external condenser from point shown
to ground.
Values of both condensers are the same and will
be determined by the sweep speed desired. Note
that the only ranges that these condensers will
affect are the 50, 100 and 200 MICROSECONDS/CM
ranges. The extension of the sweep time is in
proportion to the amount of capacity added to the
circuit. For example, since the largest capacity
in the circuits are . 2 and . 22 gfd, using 2 mfd
condensers will increase the calibration of
the above ranges to approximately .5, 1, and
2 seconds /cm respectively.
Unlike adding condensers at an external terminal
at the rear, this method will make no great sacri 
fice in linearity.
Figure 2-14