HP 8648 A/B/C/D - Changpuak.ch

Time Base DAC
All HP 8648A/B/C/D
A Manual Adjustment This automated adjustment can be replaced by performing the manual
is Available Internal Reference Oscillator Adjustment instead.
7-22 Adjustments
Description This adjustment determines the proper DAC setting to achieve a
frequency reading of 1 GHz f 1 Hz. The DAC settings are then stored
away.
This program determines the proper DAC setting to achieve a
frequency reading of 1 GHz f 1 Hz. The DAC setting is then stored
away.
Required Test Spectrum Analyzer
Equipment . Primary Frequency
Procedure
an61 2a2d
HP 6646
UNDER TEST
RF Output
Standard
-
I
Input -
5oQ
Figure 7-22. Time Base DAC Test Setup
1. Connect the equipment as shown above.
2. Preset all of the equipment.
3. Follow the instructions as they are displayed on the PC.
I I
PRIMARY
FREQUENCY
STANDARD
10 MHz
-2 to +iOdBm