HP (Hewlett-Packard) HP 85660B ユーザーズマニュアル

The second and third numbers are the M and N divide numbers respectively. The waveform
at test points 3 and 7, 5 and 6, and 1 and 2 should be as shown in Figures 1, 2, and 3
respectively. The Center Frequencies for Figure la, lb, lc, and 

 are 3.77 

 3.96

 4.15 

 and 4.34 

 respectively. The M and N numbers are 20, 21, 22, and 23

respectively.

Oscilloscope control settings for Figure 1, Figure 2, and Figure 3 are:

Vertical: 0.1 
Horizontal: 0.2 
Probe: 

Waveforms on the M Divider   require the M/N VCO be phase-locked at 380
MHz. If the M/N VCO is not phase-locked, an external signal generator may
be used to locate the failure.

3

All waveform voltage levels are emitter coupled logic (ECL) levels:

-0.9 V   high, -1.7 V   low.

The Mixer inputs are 400 MHz from 

 100 MHz VCXO and 355 to 395 MHz from 

M/N Output. When the M and N numbers are the same, the M/N output frequency is
380 MHz.

 3