1250 Frequency Response Analyzer Options
AMK/1250/2 15-15
15.4 AUXILIARY GENERATOR UNIT 12506*
15.4.1 INTRODUCTION
There are three versions of the Auxiliary Generator, each synchronised to the main
Generator:
a. 12506A, which produces a cosine wave with respect to the main Generator's sine
wave, and hence leads it by 90 degrees.
b. 12506B, which produces a sine wave, in phase with the main Generator.
c. 12506C, which produces a sine wave, 180 degrees out of phase with respect to the
main Generator's sine wave. All three versions work with any issue of 1250 software.
15.4.2 DESCRIPTION
The 12506 consists of:
a. A single printed circuit board, bearing a label on the component side showing the
type number, e.g. 12506A and the serial number.
b. A metal screening plate, with two M3 screws.
c. A metal panel carrying two terminals, either 4 mm or BNC type, connected to a lead
with a polarised two-pin plug on the other end.
15.4.3 INSTALLATION
A 12506 ordered with a new 1250 will be installed and tested at the factory. When the
12506 is to be added to an existing 1250, it is recommended that installation be
performed by a Solartron engineer. If this is not possible, follow the procedure given
below:
CAUTION: The General Safety Precautions listed in Section 2 of Chapter 2,
"Installation", must be observed; in particular Precaution 6 relating to the opening of
covers and removal of parts.
a. Plug the 12506 pcb into sockets A4 and B4 of the 1250 Mother Board.
b. Fix the metal screening plate alongside the pcb by means of the two M3 screws
inserted into the tapped holes in the metal bars. The screening plate should new be
covering sockets A5 and B5.
c. Looking at the rear panel of the instrument, remove the first blanking panel on the
left. This will reveal the title "AUXILIARY GENERATOR OUTPUT" and the words
"HIGH" and "LOW".
d. Fit the 12506 panel in place of the blanking panel such that, if 4mm sockets are
present, the red socket aligns with the "HIGH" mark; or if BNC sockets are fitted, the
one whose lead bears a red sleeve aligns with the "HIGH" mark.
e. Plug the 12506 lead into the rear-most socket of the pair on the top edge of the
12506 pcb.
f. As the unit has been calibrated at the factory, the pre-set controls on the pcb do not
require adjustment.
* Not available for 1250N
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