Calibration, External Standard Output (2461-Ce And 2461-Cf); Figure 6-11, External Standard Output - Racal Instruments 2461 User Manual

Calibration,
External Standard
Output (2461-Ce
and 2461-Cf
Performance Verification and Adjustments 6-20
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Internal Frequency Standard Adjustment
1. Prior to calibration, the 2461-Ce or -Cf must be in
continuous operation for 4 hours at an ambient
temperature of 23 +/-2°C.
2. Connect the master frequency standard (9480/FRS
or equivalent) to INPUT 1 of the 2461-Ce or -Cf
Frequency Counter.

Figure 6-11, External Standard Output

3. Program the 2461-Cf Frequency Counter as follows
using the Soft Front Panel or SCPI commands using
a program like VIC or VISAIC:
a. Frequency, Channel 1, 10s gate time
(CONF1:FREQ 10e6,10)
b. AC coupled 50 ohm input impedance
(INP1:COUP AC;IMP 50)
c. Auto-Trigger (INP1:COMP:SET:AUTO)
d. Select internal standard (SOUR:ROSC INT)
4. Use a small screwdriver to adjust the Frequency
Adjust Screw until a reading of +10.00000000e+06 is
reached. Use READ? to take a reading.
2461Type C User Manual
Racal Instruments  1998