Fluke 9640A Series, Instruction Manual

Page: 197 / 324

Calibration
Performance Test
5
5-7
Frequency Accuracy
Equipment required for this test:
•
Frequency Counter
•
Frequency Standard
•
50
Ω
Leveling Head (supplied with UUT)
Use the following procedure to verify the accuracy of the output frequency developed by
the UUT:
1.
Warm up the UUT (continuous operation) for 24 hours, minimum.
2. Connect the 10 MHz output from the frequency standard to the EXT REF IN on the
frequency counter (rear panel) using a BNC male – male cable assembly. Set the
frequency counter for external time base reference.
3. Connect the 50
Ω
Leveling Head to the Channel A input of the frequency counter
using a Type-N female-to-BNC male adapter. Set the frequency counter input
impedance to 50
Ω
. See Figure 5-2 for equipment connections.
! ! !
MHz
10.000000
9610A/AF REFERENCE SOURCE
10V
PK
MAX
RF
COMMON
96xx
HEAD INTERFACE
RF OUTPUT
CONTROL
CONNECT
96xx HEAD
ONLY
STBY
NEXT
CHAR
6
9
5
8
4
7 7
3 2 1
-
-
0 .
SPACE EXP BKSP
ALPHA
LOCK LOCK
DEF
MNO
ABC
JKL
/ /
GHI
WXYZ TUV PQRS
ENTER
SINE
MOD
SWEEP
UNITS
SETUP
OPER
Frequency Counter
Front
Rear
10 MHz Output from
Frequency Standard
External
Ref Frequency
Input
Instrument
ead228f.eps
Figure 5-2. Equipment Connections - Frequency Accuracy Test
4. Set the UUT as follows:
Mode
Leveled Sine

Frequency 10 kHz
Level +13 dBm
Output
OPER