Racal Instruments 9916 User Manual

-Decimal Point
3.7 Decimal point (d.p.) illumination is obtained by encoding the time base control
(RESOLUTION) switch logic with the digital indicator 'enable' signals. The
encoder output turns on a d.p. drive transistor at the correct time to light the appropriate
decimal point.
CONTROL INFORMATION
-3.8 A 3-line system is used for time base (gate time) selection. Th~ lines are
identified as x, y and z, and the lagic coding is in Table 2 in the Technical
Specification.
RES (STaR ARRA Y$
3.9 Many of the integrated circuits are 'open collector' types. For these lC's discrete
'pull_up' resistors are provided in the circuit. These resistors may be mounted In
aled dual-in-line (d.i.l.) packages, for example R108 (Fig. 5) which has thirteen lk
- resistors with a common connection to +5'1/. Such arrays cannot be serviced and must be
changed in the event of a faulty resistor. Another type of resistor array comprises ad. i .1.
package containing separate resistors of identical values, for example R107 which contains
eight 220 ohms res istors .
CONTROL SEQUENCE
3.10 Fig. 3.3 shows the control sequence diagrammatically (not to scale).
I A,.. 900~ ,
1<
~
I I
MAl"
CAIE
__ CA_'_C _oP_c_N_I: : I
=-
---:-:-,:-::-'-......: ---!..:,_n, __ --:- _
DATA uPDATE _
IINI €IlNAl I I I
~ I
~SOu, I I
I I 100 ~, I
I lE 'I
R-=E:..:.S"-E' t=l_'_OO_V_' LI _
IINtERNAL)
Control Sequence Diagram
Fig.3·3
3-4
9916Vol.2

Racal Instruments 9916 Specifications

General

Brand	Racal Instruments
Model	9916
Category	Measuring Instruments
Language	English