The compact, hand, battery-powered SPM-33 Selective
Level Meter have been designed as multi-function in-service test sets for CF
transmission systems with up to 300 voice channels. The lower frequency
limit of (50)200 Hz makes measurements in the audio and voice range
possible. From 50 to 200 Hz, measurements are possible but with lower
accuracy and sensitivity.
Selective and wideband measurements of level and
noise at balanced and coazial test points can be made. If higher levels
are to be measured, e.g. power line carrier systems, the necessary extrenal
attenuator is available as an accessory.
The instruments can therefore handle practically
all field tests thta are carried out during the installation, maintenance and
monitoring of CF systems as operated by PPTs, the railways or public utility
companies in the energy sector for example.
and wideband measurements
gives high frequency accuracy
settings: numeric entry by means of keyboard, in steps, or in
and relative level measurements
level and voltage display and autoranging
bar graph shows result trends
demodulator and loudspeaker
for 100 setups/fixed frequencies
results can be stored
by internal batteries or external a.c. adapter/charger