Tektronix 5441 Instruction Manual page 36

Operating Information-5441lR5441
High Resolution Phase Measurement
More accurate dual-trace phase measurements can be
made by increasing the sweep rate (without changing the
variable SecIDiv control setting). One of the easiest ways to
increase the sweep rate is with the Swp Mag (10X) button
on the time-base unit. The magnified sweep rate is automat-
ically indicated by the crt readout and knob-skirt scale-fac-
tor readout.
EXAMPLE: If the sweep rate were increased 10 times
with the magnifier, the magnifier sweep rate should be
45"Idiv
+
10
=
4.5"Idiv. Figure 2-12 shows the same sig-
nals as used in Fig. 2-11 but with the Swp Mag button
pushed in. With a horizontal difference of six divisions the
phase difference is:
Channel 1, or left
Channel
2,
or
plug-in (reference) center plug-in
t b
Horizontal
I
j c
difference
- 1
horizontal sweep rate
Fig. 2-12. High-resolution phase difference measurement with
Phase
=
difference X (degrees1
=
(6) (4.5')
=
27'
increased rite.
Difference
(divisions) division)
The phase difference is 27".
REV MAY 1982