4-4.
ADJUSTMENTS'
a .
D C Offset Adjustment
This adjustment may be performed if the output de l evel is determined to be out
of specifi cation . The adjustment should be performed after a l l owing at least 1 0
m inutes for the i nstrument to warm up under power. Connect a short across the
i n put conne ctor o f the i nstrument and the DC Mul timeter across the output
connector. Perform the adjustments shown below:
Cutoff Freq .
Mode
Gain
Response
1 0. 00 x 1 K
H i Pass
2 0 dB
Flat Ampl .
0 . 01 x 1 K
L a Pass
20 dB
F lat Ampl .
b .
Attenuator Response Adjustment
Adjustment and
Output V
452 : Vo
852 : Vo
R23 : ± 2 . 5 mV
R27 : ± 2 . 5 mV
R8 : ± 2 . 5 mV
R8 : ± 2 . 5 mV
This adjustment may be performed if the response at 1 00 K Hz in high-pass mode
and 0 dB gain is out of specifi cation . Connect the Frequency Synthesizer to the
i n put of the i nstrument and the Gain/Phase Meter betwen input and output.
Use the fol l owing settings:
Input Frequency
Amplitude
F i l ter Settings
1 00 KHz / 1 K Hz
1 . 0 V rms
5 . 00 x 1 0
H i Pass
o
dB Gain
F lat Ampl .
Model 452:
Adj ust C1 to obtain same gain at 1 00 KHz as at 1 K Hz (within
± 0 . 25 dB)
Model 852:
Adj ust C1 to obtain same gain at 1 00 KHz as at 1 KHz (within
± 0 . 5 dB)
c .
Gai n Adj ustment
This adjustment may be performed if the passband gain, or the attenuation at the
cutoff frequency i s determi ned to be out of speci fication . Connect the 51 00 Frequency
Synthesizer to the i n put of the instrument and the 400FL AC Voltmeter to the
appropriate points indicated below. Proceed as fol l ows:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
4-16
* The Frequency Synthesizer shou ld be terminated with 50 ohms and the Fi lter
Channe l under adj ustment should be terminated with 5K .
