Philips PM5324 Instruction Manual page 16

2.2.4.2. Amplitude·modulated (AM) H
Internal
- Pre liminary adjustment according to chap.
- Press button AM/ 1 k H z. The HF-sign a l is modu lated in amp litude by 30 % at an internal frequency of 1 k H z.
- For indications on checking and adjusting, see the ind ividua l
object to be measured or chapter 2.3 . .
External
- Preliminary adjustment according to chap. 2.2.4.1
- Press button AM/EXT.
- Supply the modulation voltage to connector
- Externa l modulation frequency 20 Hz ... 20 kHz.
- Adjust the modulation d epth by the ampl itude of the modulation voltage; voltage necessary 0.2 V / 10 %
ampl itude· modu lation.
For indications on checking and adjusting, see the individual checking and adjust ing procedures for the
o bject to be measured or chapter 2.3.
2. 2.4.3. Frequency·modulated (FM) H F-signal generator
Internal
- Press buttons 75 - 1 10 or 10.3 - 11.1 MHz.
The selected range sca l e is indicated by a LED.
- Set the pointer at the required frequency by potentiometer FREQUENCY.
Not marked frequency va lues should be interpolated between two mar ks.
- If necessary, calibrate the frequency at the nearest ca l i bration-mar k
- Press button FM/1 k Hz; the HF·signa l
25 kHz.
- Apply the signal, available at BNC connector H F OUT, across a cabl e to the object to be measured.
(see accessories, chapter 1.3.).
- Adjust the required output voltage by means of potentiometer HF A MPLITUDE.
For indications on checking and adjusting, see the individual checking and adjusting procedures for the
object to be measured or chapter 2_3.
Note
When using harmonics the frequency sweep is multiplied by the order-number of the harmonics.
External
- Pre liminary adjustment according to chap. 2.2.4.3 . .
- Press button F M/EXT.
- Supply the modulation vo ltage to BNC connector LF IN; m aximum input voltage 70 V peak-peak.
- Adjust the external modulation frequency; 20 Hz ... 60 kHz.
- Adjust the modulation sweep with the externa l
sweep 75 k Hz).
- If necessary, supply a multiplex-signal to BNC connector LF IN.
For indications on checking and adjusting, see the individual check ing and adjusting procedures for the
object to be measured or chapter 2.3.
2.2.4. 4. Wobble generator
- Press range- button 75 ... 110 or 10.3 ... 1 1.1 MHz.
The selected range-scale is indicated by a LED.
- Set the pointer to the required frequency by potent iometer FREQUENCY.
Not marked frequency va lues should be interpolated.
- Press button WOB.
- Connect BNC-connector 1 k Hz/SWEEP OUT to the X-input of an oscilloscope.
- Adjust the X-amplitude of the osc i l loscope.
- Apply the wobbu l ated sign a l across a cable to the o bject to be tested.
F s gn
· i al generator
2.2.4. 1 . .
.
.
LF IN; maximum 16
is modulated in frequency
voltage; necessary voltage 0.2 V17.5 kHz
check ing and adjusting procedures for the
V peak-peak, m aximum
according to sub·para 2.2.4.5
by 1 kHz and a frequency sweep of
sweep
15
d.c. level ±12 V.
.
.
about
(maximum