Fluke PM6690 - Resolution Test; Rear Inputs;Outputs; 10 Mhz out; Ext Ref Freq Input

Resolution Test
–
Connect the pulse generator to a power
splitter.
–
Connect one side of the power splitter to
Input A on the counter using a coaxial ca
-
ble.
–
Connect the other side of the power split
-
ter to Input B on the counter.
Settings for the pulse generator:
–
Amplitude = 2 V
PP
, (high level +2 V and
low level 0 V)
–
Period = approx. 1 ms
–
Duration = approx. 50 ns
–
Rise time = 2 ns
Restore the timer/counter's default settings
and make the following changes:
–
Function = Time A-B
–
Press STAT/PLOT key to the right of the
display.
–
Settings for INPUT A and INPUT B:
–
50 W input impedance
–
MANual trigger level
–
Trig level = 0.5 V
–
DC coupling
–
POS slope
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 termination.
–
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 another 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 ® Meas Ref ® External
–
The display should show 10 MHz.
–
Change the external reference frequency to
5 and 1 MHz.
–
The counting should continue, and the dis
-
play should still show 10 MHz.
EXT ARM INPUT
–
Proceed from the test above.
–
Select MANual trigger.
–
Connect the pulse generator to Ext Arm
Input.
–
Settings for the pulse generator:
single shot pulse, manual trigger,
amplitude TTL = 0 - 2 V
PP
, and
duration = 10 ns.
Performance Check
Rear Inputs/Outputs 7-9