TB 9-6625-1947-35
IDENTIFICATION AND DESCRIPTION
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.
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).
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Range: 10 Hz to 10 MHz in 6 bands
Accuracy: 2%, 100 Hz (on X100 range) to 5 MHz
3%, 10 Hz to 5 MHz
4%, 10 Hz to 10 MHz
Range: -90 to +11 dB in 10 and 1 dB steps
Accuracy: 1.5% from +10 to -60 dB
10% below 60 dBm at frequencies greater than 300 kHz
Flatness2
0.5% referenced to level at 1 kHz from 10 Hz to 10 MHz for 50 Ω output
only
Distortion3
>40 dB below fundamental from 10 Hz to 1 MHz
>34 dB below fundamental from 1 MHz to 10 MHz
Meter tracking
0.05 dB
Amplitude
1% at 1 kHz, 10 dBm level with meter centered
Output impedance
50 Ω and 75 Ω unbalanced outputs 135 Ω, 150 Ω, and 600 Ω balanced
outputs
1Procedure
limitation: Certified from +10 to -60 dB only.
2Only
the 50 Ω UNBAL output is checked in this procedure.
3Certified from: 10 Hz to 100 kHz, audio analyzer.
100 kHz to 10 MHz, spectrum analyzer.
