Philips PM 5125 Manual page 18

22
The top scale of the meter M 1 is calibrated for:
— RMS values in the case of sine wave operation
— peak to peak values in the case of square wave operation.
The bottom scale of MI indicates the output variations in dBm
(0 dBm
1 mW into 600 n (0.775 V)).
2. When the waveform selector ~,/~ is in position 2„ it is recommended
to screen the output at the terminal "600 S2" for optimum waveform
in the case that the attenuator "—dB" is set to its lowest position
(-60 dB).
3. The trimming potentiometer R45 (see Fig. 12) controls the distortion
and the settling time.
A lower distortion and a higher settling time are obtained when R45
is turned anti-clockwise.
A higher distortion and a lower settling time are obtained, when R45
is turned clockwise. (see Fig. 7)
i,<
ID
09
OH
07
0. 6
0. 5
0<
03
0.2
0.1
0
IO Nz
Rt,S MAXIMUM
R46 NORMAL
R<5 MINIMUM
SPECIFICATION
IOOMx
IM Mx
Fig. 7. Adjustmen( ojdistortion
IOkNz
IOOk Nz IM Nz
FRED UENLV
MA5613A