Quadriatic Frequency

Figure 2. Motherboard.

Passband Unity-Gain

TB-9-5915-214-35 Calibrator Procedure for Tunable Active Filter Krohn-Hite Model Manual
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TB 9-5915-214-35

g. Connect calibrator to INPUT CH 1 using 50Ω termination.

h. Connect true rms voltmeter to test point TP 4 (fig. 2) and chassis ground.

i. Adjust calibrator for a 200 Hz, 1 V output and reference true rms voltmeter to 0 dB.

j. Alternate calibrator and TI frequencies between 25.6 kHz and 175 kHz using

technique of f above to enter TI frequency. Adjust C167 (fig. 2) for a -5.33 dB true rms

voltmeter indication or split the difference between the two readings.

k. Connect true rms voltmeter to TP 2 (fig. 2) and chassis ground.

l. Alternate calibrator and TI frequencies between 25.6 kHz and 175 kHz using

technique of f above to enter TI frequency. Adjust C147 (fig. 2) for a -5.33 dB true rms

voltmeter indication or split the difference between the two readings.

m. Adjust calibrator for a 2.1 kHz, 1 V output.

n. Press corresponding keys as listed in (1) through (5) below and verify CUTOFF

FREQUENCY indicates 2.100.

(1)

2 data entry key.

(2)

. data entry key.

(3)

1 data entry key.

(4)

KILO parameter key.

(5)

FREQ parameter key.

o. Alternate between TP 2 and TP 4. Adjust R162 (fig. 2) for a -5.33 dB true rms

voltmeter indication or split the difference between the two test point readings.

p. Connect true rms voltmeter to test point TP 4 (fig. 2) and chassis ground.

q. Press corresponding keys as listed in (1) through (5) below and verify CUTOFF

FREQUENCY indicates 256.0.

(1)

2 data entry key.

(2)

5 data entry key.

(3)

6 data entry key.

(4)

KILO parameter key.

(5)

FREQ parameter key.

r. Adjust calibrator for a 256 kHz, 1 V output. If true rms voltmeter does not

indicate -5.33 dB, adjust C164 (fig. 2) until true rms voltmeter indicates -5.33 dB.

s. Press MODE parameter key until CUTOFF FREQUENCY display indicates h.P.

t. Connect true rms voltmeter to test point TP 2 (fig. 2) and chassis ground. If true

rms voltmeter does not indicate -5.33 dB, adjust C144 (fig. 2) until true rms voltmeter

indicates -5.33 dB.

u. Press MODE parameter key until CUTOFF FREQUENCY display indicates L.P.

v. Connect true rms voltmeter to test point TP 4 (fig. 2) and chassis ground.

w. Alternate calibrator and TI frequencies between 25 kHz and 250 kHz using

technique of f above to enter TI frequency. Adjust R160 (fig. 2) for a -5.33 dB true rms

voltmeter indication or split the difference between the two readings.

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