TB 9-6625-160-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Audio Analyzer, Hewlett-Packard, Models 8903A and 8903B.
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. Differences are annotated in text and tables.
b. Time and Technique. The time required for this calibration is approximately 6
hours, using the dc and low frequency technique.
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
SOURCE SPECIFICATIONS
Distortion
Residual distortion and noise:
80 kHz BW
Range:
20 Hz to 20 kHz
Accuracy: (the higher of) 80 dB or 17 V
500 kHz BW
Range:
20 Hz to 50 kHz
Accuracy: (the higher of) 70 dB or 50 V
Range:
50 kHz to 100 kHz
Accuracy: (the higher of) 65 dB or 50 V
Sig/noise
Display range: 0 to 99.99 dB
Accuracy: 1 dB
Input voltage
Range:
50 mV to 300 V
Residual noise
80 kHz BW
Accuracy:
(the higher of): 85 dB or 17 V (80 dB or 30 V 8903A)
Accuracy:
(the higher of): 70 dB or 50 V (70 dB or 95 V 8903A)
500 kHz BW
Frequency
Range:
20 Hz to 100 kHz
Accuracy:
0.3% of setting
Output level
Range:
0.6 mV to 6 V open circuit
Range:
20 Hz to 50 kHz
Accuracy:
2% of setting. 60 mV to 6V; open circuit
Range:
20 Hz to 100 kHz
Accuracy:
+3% of setting. 6 mV to 6V (6mV to 60mV 8903A);
open circuit
Range:
20 kHz to 100 kHz (20 Hz to 100 kHz 8903A)
Accuracy:
5% of setting. 0.6 mV to 6 mV; open circuit
Flatness
Range:
20 Hz to 20 kHz; 1 kHz reference
Accuracy: 0.7% ( 0.06 dB)
Range:
20 Hz to 100 kHz; 1 kHz reference
Accuracy: 2.5% ( 0.22 dB)