FUNCTION AND RANGE
HINTS AND COMMENTS
When active, trigger levels will be displayed according to
this table:
Auto Level
Manual
DC
Level selected
Level set using
by Auto.
Set Value.
AC
Level selected
0 V.
by auto.
Use Read-Level to check what trigger-levels Auto-Level has
selected.
When active, the signal on Input-A is also connected to In-
put-B.
The DC/AC and Attenuator switches for Input-A affects both
Input-A and B. The Input-B DC/AC and Attenuator switches
have no effect. (See figure 7).
Trigger level/sensitivity and Slope can be selected sepa-
rately.
You can use COM B via A and the manual trigger level
settings to make accurate rise-time measurements:
1.
Select AC-coupling, COM B via A and positive slope
for input A and B.
2.
Select VOLT A MAX-MIN and read the amplitude of
the signal.
3.
Calculate 10 % of the peak to peak voltage.
4.
Depress SET A, use and to set trigger level A to
the MIN reading plus the 10 % of Vpp.
5.
Depress SET B, use and to set trigger level B to
the MAX reading minus the 10 % of Vpp.
6.
Select TIME A-B.
This is the HF-input which must be used when the FREQ-C
function is selected. If the Timer/Counter does not include
the Input-C option, the BNC-connector is replaced by a plas-
tic plug.
Range:
70 to 1300 MHz.
Impedance:
50
Ω
Sensitivity:
10 mV
RMS
up to 900 MHz, 15 mV
RMS
900-1100 MHz
and 40 mV
RMS
above.
Max voltage:
12 V
RMS
RATIO C/A and RATIO C/B can be selected via the bus.
The Timer/Counter automatically detects if a suitable signal
is connected to the EXT- REF Input-connector.
Suitable signal:
10 ± 0.1 MHz, 0.5 to 15 Vrms Sine wave.
Use external reference when the measurement requires
ultra-high stability.
The Timer/Counter must still have the internal time base
even if an external reference frequency is used.
If single is selected, the EXT REF indicator on the display is
not switched on until after the first measurement.
OPERATING INSTRUCTIONS
Page: 21
PM 6666 - OPERATORS MANUAL
