Philips PM 5125 Manual page 17

21
B. SWITCHING ON
- Switch on the instrument by means of the switch POWER ON (SKI).
The indicator LAI should then light up.
- Wai[ for 20 minutes before proceeding with the following, if ,a stable
output frequency or voltage is required.
C. SELECTING THE FREQUENCY
1. -Select the frequency range by means of the switch "FREQ. Hz"
(SK3).
- Adjust the desired frequency within the selected range by means of
the frequency dial (Rlr - Rln).
2. - if synchronisation of the generator frequency is requited; then
apply an external signal to the terminals SYNC. IN (BU3 and BU5).
This signal should have an amplitude of 40 mV per peccent of
required hold. For the initial set-up make sure that the generator
frequency corresponds to the frequency of the external signal;
D. SELECTING THE OUTPUT VOLTAGE
- Select the waveform of the output voltage by means of the 'switch
- Set the attenuator switch "—dB" (SK4) to position 0.
- Adjust the amplitude of the output voltage at the terminals "LOW Zo"
(BUl) and "600 S2" (BU4) continuously by means of the attenuator
"AMPLITUDE" (R2), as indicated by the meter ML
- Adjust the amplitude of the output voltage at the terminal "6p0 S2"
(BU4) in steps of 20 dB by means of the attenuator switch "-dB"
(SK4).
Notes
1. The meter M1 indicates the output voltage at the terminal "LOW Zo".
When no load is connected to the terminal "600 S2", then the output
voltage at this terminal is equal to the indication of M I divided
by
a
factor:
- 1
in position
0 dB of the switch "—dB" (SK4)
- 10 in position —20 dB of the switch "---dB" (SK4)
- 100 in position —40 dB of the switch "—dB" (SK4)
- 1000 in position —60 dB of the switch "—d6" (SK4).
When a 600 S2 -load is connected to the terminal "600 Sl", then the
output voltage at this terminal is halved.