HP 4935A Operating And Service Manual page 27

Operation
digit to be increased or decreased. Lighted cursor indicates one-of-two digit positions. Digit value is
10. MEASUREMENT Section.
detailed measurement information of each mode see Figure 3-3. Measurement modes are:
NOISE
NOISE WITH TONE
SIGNAL TO NOISE
IMPULSE NOISE
P/AR (Options 002, 003)
FILTER Section.
11.
I ~'I'KR~'STOKK
wrighting-filter I,EI) will light. In IXVEI, FKEQIJENC~Y the STORE function enables frequencies
on right display to he stored for recall using the Fl, E'2, F:J, or P4 keys. The STORE function is also
12. IMPULSE NOISE Section.
Impulse-Noise controls are used in KCV and in conjunction with the MEASUREMENT section
IMPULSE NOISE mode. Four keys control this section:
START RESET/F3-2804
STOP/ F4-2713
PERIOD: Sets the instrument timer for the impulse noise test (5 MIN, 15 MIN, 60 MIN or
NON-STOP). Also provides the Fl-404 Hz preprogrammed frequency for LEVEL FREQUENCY
Mode.
DISPLAY: Changes the display through each of the threshold values and their impulse noise
counts then displays the TIMER setting selected by the PERIOD key. Also provides the F2-1004
START/RESET: Starts the impulse noise test and resets the count to zero for every threshold.
Also provides the F3-2804 Hz preprogrammed frequency for LEVEL FREQUENCY Mode.
STOP: Stops the impulse noise test but retains the displayed count values. Also provides the
Figure
Key. Selects desired weighting filter for Noise Measurements. Selected
3-1. Front and Rear Panel
pressing STEP DOWN. THRESH LED,
by
Controls/Connectors/Indicators
Model 4935A
(Continued)