TB 9-6625-1098-24
Table 6. Second Harmonic Rejection
Test instrument
Test instrument
meter indications at second harmonic
Calibrator
FREQUENCY
FREQUENCY
(dB)
frequencies
RANGE
dial
switch settings
settings
Min
Max
X10K
20
200 kHz
-2.0
0.0
X10K
5
50 kHz
-1.0
0.0
X1K
5
5 kHz
-0.6
+0.6
X1K
15
15 kHz
-0.6
+0.6
X100
20
2 kHz
-0.6
+0.6
X100
5
500 Hz
-0.6
+0.6
X10
5
50 Hz
-0.6
+0.6
X10
20
200 Hz
-0.6
+0.6
X1
15
15 Hz
0.0
1.0
b. Adjustments. No adjustments can be made.
16. Automatic Null (Hewlett-Packard, Models 333A and 334A)
a. Performance Check
(1) Connect calibrator OUTPUT to TI INPUT.
(2) Position TI controls as listed in (a) through (g) below:
FUNCTION switch to VOLTMETER.
(a)
METER RANGE switch to 1 VOLT.
(b)
MODE selector switch to MANUAL.
(c)
FREQUENCY RANGE switch to X100.
(d)
FREQUENCY dial to 50.
(e)
SENSITIVITY switch to MAX.
(f)
SENSITIVITY VERNIER control to MIN.
(g)
(3) Adjust calibrator for 5 kHz and adjust level for a 1 V indication on TI meter.
(4) Set FUNCTION and METER RANGE switches to SET LEVEL.
(5) Adjust SENSITIVITY and VERNIER controls for a +2 dB indication on
TI meter.
(6) Set FUNCTION switch to DISTORTION.
(7) Adjust FREQUENCY dial and BALANCE controls for a null indication on
TI meter.
(8) Reduce METER RANGE switch as necessary to maintain an on-scale reading.
Record TI meter reading.
(9) Set METER RANGE switch to 100% (SET LEVEL).
(10) Adjust FREQUENCY dial and BALANCE controls for a null indication on TI
meter. When TI indication is less than 3% on 0 to 3% (SET LEVEL) scale, set MODE
switch to AUTOMATIC.
(11) Reduce METER RANGE switch as necessary to maintain an on-scale reading.
Record TI meter reading.