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Chapter 2 Service
The HP 53181A Calibration Procedures
2-34 Assembly-Level Service Guide
2
8 Disconnect the calibration setup.
This completes the Gain Calibration procedure.
Depending on which timebase the Counter contains, proceed to either the
following procedure “To Calibrate the Standard Timebase” or the
“To Calibrate the High Stability Timebase Option (Medium, High, or
Ultra-High)”procedure (page 2-35) to calibrate the timebase.
To Calibrate the Standard Timebase
1 Connect the output of a 10 MHz house standard to Channel 1 of
the Counter as shown in Figure 2-7.
Figure 2-7. Standard Timebase Calibration Setup
2Cycle the POWER key to preset the Counter.
Allow the counter to warm up for approximately 30 minutes.
3 With an insulated tuning tool, turn the OSC Adjust potentiometer
(located on the rear chassis of the Counter) until the frequency
reading in the Counter display is 10.00000000 MHz ± 5 Hz.
The Counter will be calibrated to the house standard.
If you are not able to adjust the frequency correctly, refer to the
troubleshooting section in this chapter.
This completes the Standard Timebase Calibration procedure.
HP 53181A
Counter
Channel 1
House Standard
10 MHz Reference