TB 9-6625-357-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Variable Filter, Krohn-Hite, Model 3202(R). The manufacturers' 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. 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 table 1.
Table 1. Calibration Description for Spencer-Kennedy Model 3202(R)
Test instrument parameters
Performance specifications
Power supply1
105 to 125 V ac or 210 to 250 V ac; 50 to 400 Hz, 15 W
Frequency range
20 Hz to 2 MHz
5%, 20 Hz to 200 kHz; 10%, 200 kHz to 2 MHz, (response switch
Cutoff frequency accuracy
in max flat position)
24 dB 10.5 dB per octave
Rate of attenuation
Insertion loss
0 0.5 dB, 0 to 2 MHz; 3 dB at 10 MHz
Less than 100 V for a detector bandwidth of 2 MHz, rising to 150
Noise and hum level
V at 10 MHz
Maximum attenuation
Greater than 80 dB
1
Power supply
105 to 125 V ac or 210 to 250 V ac; 50 to 400 Hz, 15 W
1
This specification is for information only and is not verified in this bulletin.
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM 286; AN/GSM-287; or AN/GSM-705. Alternate items may be used
by the calibrating activity. The items selected must be verified to perform satisfactorily
prior to use and must bear evidence of current calibration. The equipment must meet or