HP 5335A - Page 44

Operation and Programming
3-147. PHASE A ref B
3-148. The PHASE mode measures the phase of the signal on Input A, relative to the signal on
Input B. The phase difference is displayed in degrees. In this mode, Auto Preset triggering is
automatically selected. The trigger points are set to the 50% points of each signal, regardless of
either signal’s offset.
3-149. The overall display range is -180° to +360°. The display of a PHASE measurement is con¬
figured such that around 0°, the operating range is -180° to +180°, but around +180° the oper¬
ating range is 0° to 360°. If RANGE HOLD is on, the range is fixed to 0° to 360°. The PHASE
mode cannot be externally armed.
3-150. Phase measurements are made through a series of individual measurements, therefore
certain input and operational restrictions apply:
• The frequency and phase angle of the signals should be constant.
® Frequencies can be measured up to 1 MHz.
• PHASE A rel B measurements should be made with the SEP/COM switch in SEP. if COM A
is momentarily selected, the RESET key should be pressed.
• RESET should be pressed after any change to the INPUT controls, particularly for SLOPE
and SEP/COM controls.
NOTE
Because phase requires a steady signal input, the use of statistics
is not valid (i.e„ the STD DEV of a steady signal should be
0, and the MEAN should be the same as any one measurement).
Therefore, the use of STATISTICS for PHASE measurements is
not recommended.
3-28
Model 5335A