FUNCTION AND RANGE
HINTS AND COMMENTS
When reset is depressed, the display and counting registers
are cleared. When reset is released, a new measurement is
started. The Measuring-time-, Function- and display hold-
settings are not affected.
If the TOT A MAN function is selected, the RESET/LOCAL
button functions as a START/STOP button. One press
starts the counting and the next press stops it. A long de-
pression results in reset.
When the counter is controlled from the GPIB-Bus, the
LOCAL button can be disabled via the ‘Local Lock out’
command.
Display hold freezes the display, but not until the measure-
ment in process has been finished. A new measurement
can always be initiated via the RESET button.
Use this input for all functions except FREQ C.
Input data:
Range:
DC Hz to 160 MHz
Impedance:
1 M
Ω
//35 pF.
Min. pulse duration:
4 ns
At higher frequencies; use a 50
Ω
termination type PM 9585
to avoid interference caused by impedance mismatch.
The illustration below shows which function block each of
the input controls affect.
This input is used for Ratio A/B, Time A-B and TOT A
start/stop (or gated) by B measurements.
Range:
Identical to Input-A
Attenuator
Attenuator
DC/AC Switch
DC+Trigger level
AC+Sensitivity
Slope
U
U
Counting
logic
Slope
AC+Sensitivity
DC+Trigger level
DC/AC Switch
Input-A
Input-B
Level
Level
COM B via A
Figure 7
Input Circuit Block Diagram.
OPERATING INSTRUCTIONS
Page: 17
PM 6666 - OPERATORS MANUAL
