SECTION 1
general descrtpgton
1-1 GENERAL The Model 650A Test Oscillator output voltage is con-
stantly monitored by a vacuum tube voltmeter at the
The Hewlett-Packard Model 650A Test Oscillator is a input to the output attenuator system. This VTVM
wide range precision resistance tuned oscillator cover- has two voltmeter scales plus a dbm scale (0 dbm =
ing from 10 cps to 10 MC. It has a highly stable output 1 milliwatt in 600 ohms). The attenuator control, in
signal level that is adjustable from 30 microvolts to
conjunction with the AMPLITUDE control, will pro-
3 volts into 600 ohms. Frequency response is essen- duce a monitored signal of any desired level when the
tially flat (il db) throughout the complete extended
instrument is resistive loaded with 600 ohms.
range.
The flexibility and simplicity of the 650A Test Oscilla-
The output impedance is normally 600 ohms. Where tor find a wide variety of uses in audio, video, rf, and
a low source impedance is desired, 6 ohms is pro- alignment applications as well as laboratory wide band
vided by the Voltage Divider Cable supplied with the
measurements. This instrument was designed for such
instrument. applications as fast and accurate testing of filter trans-
-
Figure 1-1 -hp- Model 650A Test Oscillator
-1 - |
ACEC
