Fluke 9640A Series, Instruction Manual

Page: 196 / 324

9640A
Instruction Manual
5-6
Note
Exercise extreme care during all connect/disconnect operations of the RF
connectors. It is strongly recommended that a properly set torque wrench
be used to secure all RF connections, where possible. For Type-N
connectors, use a torque value of 1 Nm (9 in-lb). For SMA connectors, use
a torque value of 0.45 Nm (4 in-lb).
Reference Frequency Accuracy
Equipment required for this test:
•
Frequency Counter
•
Frequency Standard
Use the following procedure to verify the accuracy of the internal frequency reference:
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 REF FREQUENCY OUTPUT (on rear) from the UUT to the Channel A
input on the frequency counter using a BNC male – male cable. Set the frequency
counter input impedance to 50
Ω
. See Figure 5-1 for equipment connections.
4. On the UUT enable the REF FREQUENCY OUTPUT at 10 MHz.
5. Set the frequency counter controls for a reliable and repeatable frequency
measurement.
6. Allow the frequency counter to take several readings and settle. The settled counter
reading must be from 9.99999960 to 10.00000040 MHz.
7. Set the UUT output to STBY. Disconnect the UUT REF FREQUENCY OUTPUT
from the frequency counter input.
CAL
IEEE-488
SH1 AH1 T6 L4 SR1
RL1 PP0 DC1 DT0 C0 E2
MADE IN UK
FLUKE CORPORA TION
www.fluke.com
TO BE
APPLIED FOR
CONFORMS TO UL STD. UL61010A-1.
CERTIFIED TO CAN/CSA STD. C22.2 No.1010.1-92
SAFETY W ARNING
NOTE
DISCONNECT PO WER AND SIGNAL LEADS
BEFORE REMO VING CO VERS .
FOR CONTINUED PR OTECTION AGAINST ELECTRIC SHOCK
THE PO WER CORD PR OTECTIVE CONDUCT OR MUS T BE
CONNECTED TO SAFETY EAR TH ( GR OUND ).
FOR CONTINUED PR OTECTION AGAINST FIRE
USE 250V FUSE OF CORRECT RA TING.
READ OPERA TORS MANU AL BEFORE USE.
NO USER SER VICEABLE P ARTS CONT AINED, DO NOT
REMOVE CO VERS , HAZARDOUS VOLTAGES PRESENT .
REFER SER VICE TO QUALIFIED PERSONNEL.
115
230
T4.0 AH 250V
T2.0 AH 250V
LINE VOLTAGE
SELECTION
FUSE 5 x 20mm
IEC 127
POWER INPUT
230 VA MAX. FREQ 47 - 63 Hz
SERIAL POR T
FACTORY SET
REF FREQUENC Y
INPUT
REF F REQUENC Y
OUTPUT
6 7 8
ENABLE
DISABLE
1V PK INTO
TTL INTO
SWEEP TRIGGER
INPUT :
5V PK
AUX PROTECTIVE
EARTH (GROUND)
RF COMMON
RF COMMON
5V PK
MODULATION
LEVELLING AND
FREQUENCY PULL
INPUT
+
_
50
5V PK
+
_
50
+
OUTPUT : TTL NOM
INTO 1k
+
1k NOM
NOM 50
10V PK MAX
Instrument
Frequency Counter
MHz
10.000000
Ref Frequency
Output
ead205f.eps
Figure 5-1. Equipment Connections - Reference Frequency Accuracy Test