Fluke PM 6666 Operator's Manual page 21

FUNCTION AND RANGE
When active, trigger levels will be displayed according to
this table:
Auto Level
DC Level selected
by Auto.
AC Level selected
by auto.
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.
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:
50Ω
Sensitivity:
10 mV up to 900 MHz, 15 mV
RMS
and 40 mV above.
RMS
Max voltage:
12 V
RMS
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.
OPERATING INSTRUCTIONS
Manual
Level set using
Set Value.
0 V.
900-1100 MHz
RMS
HINTS AND COMMENTS
Use Read-Level to check what trigger-levels Auto-Level has
selected.
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.
RATIO C/A and RATIO C/B can be selected via the bus.
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.
PM 6666 - OPERATORS MANUAL
Page: 21