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18
Vil. CONTROLS, INDICATORS AND CONNECTORS
Figure VII-1
e START/STOP
&
GATED BY B
a
POWER ON/OFF
Sets display time between 0.05 s to 5 s. Infinite display time when knob is
pulled to HOLD position.
Resets decade counters and display to zero. Starts new measurement when
released.
When
button is depressed,
measurement
information
is stored
until next
measurement
cycle is completed.
Released
button
makes
display follow
decade counters continuously.
Allows counter to measure burst signals in mode FREQ. A or FREQ. C.
With FUNCTION
switch set to COUNT A, manual control of main gate in
totalize mode. When MEMORY
switch is depressed, reset of decade coun-
ters occurs after STOP plus set display time; new counting starts from zero.
When MEMORY is released, counting is cumulative.
In the COUNT
A mode, the signal at INPUT A can be gated by signal at
INPUT B. When
MEMORY
switch is depressed,
reset of decade counters
occurs after set display time when gating pulse ends. When
MEMORY
is
released, counting is cumulative.
Secondary power switch. Turns d.c. voltages of circuitry on/off. A.C. volt-
ages
and
oven-enclosed
oscillator supply
present when
counter
is con-
nected to mains.
Sets trigger level of channel
A to +3 V or +30 V when the ATT switch is
set to x10. Level is preset to zero when knob is pulled.
Provides 10x attenuation of signal at INPUT A.
Selector for AC or DC coupled input.
Enables triggering either on positive or negative slope of input signal.
Sets 1 MQ input impedance of channels A and B.
Sets 50Q input impedance of channels A and B.
Separates inputs A and B.
Connects A signal also to B channel. If selected, 502 input impedance is
maintained.
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