HP (Hewlett-Packard) E42 ユーザーズマニュアル

1.

LINE switch

In STBY position with light on, supplies power to oven of the high stability

time base to maintain a constant temperature for the crystal. In OPER position, supplies normal
operating power to the instrument.

2.

RESET 

 Resets display and internal count to zero. When continuously depressed,

lights all segments of the LED display and all annunciator LED’s for LED test. Returns 5328A
to LOCAL CONTROL when HP-IB Interface is in use.

3.

FUNCTION 

 Selects mode of operation.

a.

FREQ A. Sets counter to measure frequency at Channel A.

b.

FREQ C. Sets counter to measure the frequency of the signal at the Channel C input.

c.

PER A. Sets counter to measure period at Channel A.

d.

PER AVG A. Sets counter to make a period average measurement of the signal at Chan-
nel A. The number of periods over which the average measurement is made is deter-

mined by N, selected by the RESOLUTION switch.

e.

T.I. AVG 

 Sets counter to make a time interval average measurement of the time

interval from A to B. The number of time intervals over which the average measurement
is made is determined by N, selected by the RESOLUTION switch.

f.

T.I. 

 Sets counter to make a time interval measurement. Start signal is applied to

Channel A and the stop signal is applied to Channel B.

g.

CHECK. Applies 10 MHz to decade counting assemblies. Verifies operation of SAMPLE
RATE control, RESOLUTION switch, and RESET.

h.

RATIO C/A. Sets counter to measure the ratio of the signal frequency at Channel C to
the signal frequency at Channel A.

i.

RATlO B/A. Sets counter to measure the ratio of the frequency at Channel B to the fre-

quency at Channel A.

j.

Top blank position has no function.