TB 9-6625-357-35
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CALIBRATION PROCESS FOR MODEL
3202(R)
Preliminary instructions........................................
Equipment setup ....................................................
Noise level and stability.........................................
Low pass dial accuracy and unity gain .................
High pass dial accuracy and unity gain................
Final procedure.......................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification.
This bulletin provides instructions for the
calibration of Variable Filter, Spencer-Kennedy, Model 302(F-900/G) and Krohn-Hite,
Model 3202(R). 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. Variations among models are described in text.
b. Time and Technique. The time required for this calibration is approximately 8
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 tables 1 and 2.
Table 1. Calibration Description for Spencer-Kennedy Model 302(F-900/G)
Test instrument parameters
Performance specifications
Power supply
105 to 125 V ac or 205 to 250 V ac 50 to 60 Hz, 120 W
1
Cutoff frequency range
20 Hz to 200 kHz in 4 decade ranges
3%, 20 Hz to 20 kHz; 5%, 20 to 200 kHz
Accuracy of cutoff range
1.76 dB
18 dB per octave
band
0 dB 1 dB, 20 Hz to 20 kHz; 0 dB 2 dB, 20 to 200 kHz
Insertion loss
80 dB below 1 V (100 V) for a detector bandwidth of 0 to 40 kHz
Noise and hum level
Distortion
Not greater than 0.5% overall harmonic distortion
1
This specification is for information only and is not verified in this bulletin.