Philips PM 6611 - Page 14

12
© 6
ee 99000 ο 9
FREQUENCY
PERIOD A
RATIO A/C
and B/C
MEMORY
START/STOP
RESET
INT.BATT.OFF
MAINS/EXT.BATT.
INT.BATT.ON
INPUT C
10 MHz OUT
BCD
INT.STD/EXT.STD
Sets counter to measure frequency.
MHz and kHz are measuring units related to the display read-out.
100 Hz, 10 Hz, 1 Hz and 0.1 Hz is the resolution of the least significant digit.
Sets counter to measure period at input A.
us is the measuring unit related to the display read out. n=1, n=10? and
n=104 indicates the number of periods being measured.
Sets counter to measure ratio between signals applied to inputs A and C
or B and C.
n=102 and n=104 are division factors for the input signal at input C,
B/C A/C
Bi
In released position the measurement information is stored until next
measurement cycle is completed.
Depressed button makes display follow decade counters continuously.
In COUNT A mode, start/stop operation.
Resets decade counter and display to zero.
Rear panel
Mains input.
Turns the internal battery off.
The mains or the external battery is the power source for the instrument.
Internal battery is charged when mains cable is connected.
Sets power supply to be fed from the internal battery. Turns the mains or
the external battery off.
Input
C.
Signal
input
for
external
time
base
signal
1
kHz
to
10
MHz
and
RATIO measurement.
Output for the internal oscillator signal.
Input connector for BCD unit.
Chassis ground.
Minus-pole connection for external battery.
Plus-pole connection for external battery.
Internal switch and connector
Sets
counter
to
operate
with
either
internal
or
external
clock
oscillator.
Connector for D/A converter and BCD unit.