TB 9-4931-538-40
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ADJUSTMENT PROCEDURES
Power supply adjustment......................................
Timebase data adjustment....................................
+10 volt reference adjustment ..............................
Range adjustment..................................................
Step recovery diode adjustment............................
Frequency adjustment...........................................
End and 4 ns cal adjustment ................................
Sampler bias adjustment ......................................
Offset gain adjustment..........................................
TDR step adjustment ............................................
Feedthrough compensation adjustment...............
Trigger adjustment................................................
Final procedure ......................................................
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
1. Test Instrument Identification.
calibration of Digitizing Oscilloscope, Hewlett Packard, Model 54121T consisting of
Digitizing Oscilloscope Mainframe, Hewlett Packard, Model 54120B and Four-Channel Test
Set, Hewlett Packard, Model 54121A. The manufacturers' manuals were used as the prime
data sources in compiling these instructions. The equipment being calibrated will be
referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for this calibration is approximately 8
hours, using the dc and low frequency and microwave techniques.
2. Forms, Records, and Reports. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Range: DC to 20 GHz1
Channel 1 dc to 18 GHz
Channels 2, 3, and 4 dc to 20 GHz1
Channels 1 through 4 dc to 12.4 GHz
Accuracy:-3 dB (channel 1 -3.5 dB at 20 GHz1 )
See footnote at end of table.