DATA PRECISION 5740 - Crystal Time Base Check Procedure; Input Signal Path Checks

72-1002 Model 5740 COUNTER
LIFT »5V LOADS
LIFT -12V loads
(-12V'
R/R -12V CIRCUIT
LIFT -6V LOADS,
I-6VI
R/R -6V CIRCUIT
>490
TP3 OHMS
>490
Fig. 4-2. Power Supply Trouble-Shooting Strategy and Test Sequence
START
OK
R/R Z23
OK
USE
TROUBLE-
SHOOT
OSC. CIRCUIT
CHECK
TPS
1MHZ
CHECK
TP9
10 MHZ
4.8 INPUT SIGNAL CONDITIONING';
PROGRAMMABLE DIVIDER, AND
DECIMAL POINT CHECK
4.8.1 Set-Up
Model 5740
Fig. 4-4. Crystal Time Bate Check Test Sequence
COeVRIGHT 1975 DATA PRECISION CORPORATION. PRINTED IN THE U.SJk.
ATTEN: XI
MODE Switch (SU): PERIOD/EVENTS
Rotary Switch (S3): See procedurJ
Figure 4-5
TRIGGER Level: Mid Scale
Signal Generator
Output OdBm into SOfl load
Frequency: 12SHz
4.8.2 Procedure
Vary the signal generator output fre
quency as shown in the table on Figure
4-6, and verify display values in table.
If an incorrect reading is displayed,
complete the test procedures of Para
graph 4.11 as an aid to trouble-shooting
the Input Signal Conditioning circuit.
45