TB 9-6625-1947-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Test Oscillator, Hewlett-Packard, Model 654A. The manufacturer's manual
was used as the prime data source 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 4
hours, using the dc and low frequency technique.
2. Forms, Records, and Reports
a. Forms, records, and reports required for calibration personnel at all levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
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: 10 Hz to 10 MHz in 6 bands
2%, 100 Hz (on X100 range) to 5 MHz
Accuracy:
3%, 10 Hz to 5 MHz
4%, 10 Hz to 10 MHz
Range: -90 to +11 dB in 10 and 1 dB steps
1.5% from +10 to -60 dB
Accuracy:
10% below 60 dBm at frequencies greater than 300 kHz
0.5% referenced to level at 1 kHz from 10 Hz to 10 MHz for 50 output
Flatness2
only
Distortion3
>40 dB below fundamental from 10 Hz to 1 MHz
>34 dB below fundamental from 1 MHz to 10 MHz
0.05 dB
Meter tracking
Amplitude
1% at 1 kHz, 10 dBm level with meter centered
50 and 75 unbalanced outputs 135 , 150 , and 600 balanced
Output impedance
outputs
1Procedure
limitation: Certified from +10 to -60 dB only.
2Only
the 50 UNBAL output is checked in this procedure.
3Certified from: 10 Hz to 100 kHz, audio analyzer; 500 KHz to 10 MHz, spectrum analyzer.