HP 8753E manual Electrical Offset

Electrical Offset

Some standards have reference planes that are electrically offset from the mating plane of the test port. These devices will show a phase shift with respect to frequency. ‘lhble 6-4 shows which reference devices exhibit an electrical offset phase shift. The amount of phase shift can be calculated with the formula:

4 = (360 x f x 1)/c where:

f = frequency

1 = electrical length of the offset

c = speed of light (3 x 10s meters/second)

Fringe Capacitance

All open circuit terminations exhibit a phase shift over frequency due to fringe capacitance. Offset open circuits have increased phase shift because the offset acts as a small length of transmission line. Refer to lhble 6-4.

able 6-4. Calibration Standard Types and Expected Phase Shift

lbst Port	Standard Type	Expected Phase Shift
Connector Type
7-mm	Sh0I.t	1800
Type-N male
3.5mm male	o&et short	lS(y + (360 x f x 0
		c
3.6~mm female
2.4mm male
2.4mm female
Type-N female
760 Type-N female
7-mm	open	0’ + Lpacitance
Ty-pe N-male
3.6-mm male	Offset Open	o” + $4 capac*tance + (=ox.fxO
		c

3.6~mm female 2.4nun male 2.4mm female Type N-female

open o” + &apacrtance +	(360 x f x I)
	c

763 Type-N female

6-74 Application and Operation Concepts