The DHO800 series has multiple phase measurements types.
From the page 130 of the user manual :
5. Phase(r-r): indicates the phase deviation between the threshold middle values of
the rising edge of Source A and that of Source B. The phase formula is as follows: <equation>
Wherein, PhaseARBR represents Phase(r-r), DelayARBR represents Delay(r-r), and
PeriodsourceA represents the period of Source A.
Phase(f-f): indicates the phase deviation between the threshold middle values of
the falling edge of Source A and that of Source B. The phase formula is as follows:
PeriodsourceA represents the period of Source A.
7. Phase(r-f): indicates the phase deviation between the threshold middle values of
the rising edge of Source A and the falling edge of Source B. The phase formula is
as follows: <equation>
8. Phase(f-r): indicates the phase deviation between the threshold middle values of
the falling edge of Source A and the rising edge of Source B. The phase formula is
Wherein, PhaseAFBR represents Phase (f-r), DelayAFBR represents Delay(f-r), and
PeriodsourceA represents the period of Source A.
Source A and Source B can be any channel among CH1-CH4 and Math1-Math4.
• The default threshold middle value is 50%.