Philips PM 5191 Operating Manual page 36

3.5.3.2.
E 3-8
Input of the Output Level
THe output level can be input either in the dimensions Vpp, dBm or Vrms. Selection is done with the
keys on the LEVEL. keyboard.
During the input of the output level care should be taken to ensure that the amplitude (Vpp) and the
offset (Vdc) together do not exceed the value +/— 15 V. The output levels that can be set for the dif-
ferent wave forms are:
WAVE FORM symbol max.
sine wave 2 MHz
triangle 200 kHz
square 2 MHz
pos. sawtooth 20 kHz
neg. sawtooth 20 kHz
Vpp and Vrms values are open circuit voltages.
The keys Vpp, Vrms and dBm allow the conversion between these measuring units by pressing the
according key twice:
Example:
Input: sine wave, 20 Vpp display shows 20 (Vpp)
pressing 2 x display shows 7.1 (Vrms)
pressing 2 x dBm display shows 24 (dBm)
Key Vdc on the LEVEL keyboard allows the input of a DC offset that can be added to the AC voltage;
the polarity of the offset voltage can be selected using key +/—.
Stepping of the Output Level (ALEVEL)
The output level can be altered into discrete steps using keys +STEP, —STEP. The smallest step ALEVEL
that can be programmed corresponds with the resolution of the output level in the respective range
(see table).
resolution ALEVEL
1
0.31
3.1
mV... 0.300 V
Vv... 3.00 V
. 300 V
10 mV
imvV
10 mV
1 mV... 0.100V
0.11 V... 1.00 V
1.1 . 150 V
Vrms
resolution 1 dBm across the entire range