Rear Panel Controls - Philips PM 6670 Operating Manual

11
o
ARMirUC
FREQ AVERAGE
EXT RESET
INCL OPTION
THERM FUSED MAINS TRANSF
GATE
MONITOR
© ©
EXT BATT
11.8- 28
©
©
o-
©
TIME INT AVERAGE A-B
Sets the counter to measure the time interval average of a
repetitive signal that is not synchronized with the used
standard frequency.
PERIOD A
Sets the counter to measure the average period time of the
signal connected to input A.
Input amplifier
ATTxIO
When depressed, the sensitivity is attenuated by a factor 10
for input A or B. In DC mode the equivalent trigger level is
multiplied by 10.
SLOPE ©_
When depressed, the triggering occurs on the trailing edge
instead of the normal leading edge.
50kHz FILTER
A low-pass filter to improve triggering of noisy signals with
frequencies below 50kHz. Applies to input A only.
COM via A
Connects channel A and 8 internally. In this mode input B is
disconnected.
TRIGGER LEVEL
When the rotary knob is depressed, the DC mode is selected
and the trigger level is adjustable between - 2.5Vand -f-2.5V.
Tri-state trigger indicators on PM6671 ...72 light to indicate
trigger status:
On = trigger level is too low
Blinking = triggering occurs, i.e. input signal
crosses hysteresis band
Off = trigger level is too high
The trigger level output on the front panel of PM6671...72
makes it possible to measure the set trigger level.
When ATTxlO is depressed, the trigger level is adjustable
between - 25\/ and -I- 25V, but the output level is still
-2.5V...-I-2.5V.
SENSITIVITY
When the rotary knob is pulled, the AC mode is selected and
the sensitivity is adjustable between approx 10...100mVR|\/]s
IGHz, PM 6672 only
When depressed, input C is connected. The sensitivity is
adjusted automatically.
LED indicators
REMOTE
Indicates that the counter is in the remote-controlled mode
via the optional Bus Interface PM9696.
GATE
Indicates that a measurement is in progress.
UNIT INDICATOR
A multi-purpose 4-LED unit indicator.
For FREQ. read: Hz, kHz, MHz, GHz.
For PERIOD, TIME and PULSE WIDTH read: ns, ps, ms, s.
For COUNT read: ps/kHz = 10® pulses
ms/MHz = 10® pulses
s/GHz = 10® pulses
REAR PANEL
EXT STD IN/INT STD OUT
Input D
Two-position switch selection of using BNC connector D
either as an output for the internal 10MHz standard signal
or as an input for an external standard signal.
ARMING/FREQ AVERAGE/EXT RESET
Input E
Three position slide switch for selecting the functions of
input E.
GATE MONITOR
Enables observation of the measured time interval
and the trigger hold-off time on an oscilloscope.
EXT BATT
Input from an external DC source 11.8...28V.