Fluke PM6690 - Rear Inputs;Outputs; Measuring Functions

Trig level = 0.5V
DC coupling
The standard deviation (
Std) should be <100 ps.
Rear Inputs/Outputs
10 MHz OUT
–
Connect an oscilloscope to the 10 MHz output on the
rear of the counter. Use a coaxial cable and 50 W termi
-
nation.
–
The output voltage should be sinusoidal and above 1
V
RMS
(2.8 V
p-p
).
EXT REF FREQ INPUT
–
Recall the DEFAULT settings.
–
Connect a stable 10 MHz signal (e.g REF OUT from an
-
other counter) to input A.
–
Connect a 10 MHz, 100 mV
RMS
, (0.28 V
P-P
) signal from
the LF synthesizer to EXT REF IN.
–
Select Ext Ref. by keying in the following sequence:
SETTINGS ® Timebase Ref ® Ext
–
The display should show 10 MHz.
–
Change the external reference frequency to 5 and
1 MHz.
–
The counting should continue, and the display should
still show 10 MHz.
EXT ARM INPUT
– Proceed from the test above.
– Select
MANual trigger.
– Settings for the pulse generator:
single shot pulse, manual trigger,
amplitude TTL = 0 - 2 V
PP
, and
duration = 10 ns.
–
Connect the pulse generator to Ext Arm Input.
–
Activate start arming by keying in the following se
-
quence:
SETTINGS ® Start Chan ® E
–
The counter does not measure.
–
Apply one single pulse to Ext Arm Input.
–
The counter measures once and shows 10 MHz on the
display.
Measuring Functions
–
Connect a 10 MHz sine wave signal with approx.
1V
RMS
amplitude into 50 W via a power splitter to Input
A and Input B, e.g. from 10 MHz Out on the rear panel.
–
Recall the DEFAULT settings.
Select the following settings for the timer/count er via
INPUT
A
and INPUT B:
–
50 W impedance for A and B.
–
MANual trigger.
2-6 Performance Check, Rear Inputs/Outputs
Selected Function Action Display P/F
FREQ A
10 MHz
2)
FREQ B
10 MHz
2)
FREQ C
--------------
3)
FREQ RATIO A/B
1.0000000
FREQ RATIO C/B
0.0000000
3)
PER SINGLE A
100 ns
2)
PER SINGLE B
100 ns
2)
PER AVERAGE A
100 ns
2)
PER AVERAGE B
100 ns
2)
PULSE POS A
50.000 ns
1)
PULSE NEG A
50.000 ns
1)
TIME INT A to B
0±1ns
Select NEG
SLOPE B
50.000 ns
1)
RISE TIME A
Select AUTO
trigger
30.000 ns
2)
FALL TIME A
30.000 ns
2)
PHASE A rel B
180° or -180°
1)
PHASE B rel A
180° or -180° 1)
PHASE A rel A
0°
DUTY POS A
0.500000
1)
DUTY NEG A
0.500000
1)
VOLT MAX A
+0.75 V
2)
VOLT MIN A
-0.75 V
2)
Table 2-8 Measuring functions check
1) Value depends on the symmetry of the signal.
2) Exact value depends on input signal.
3) If an RF option is installed.