Table of Contents
Advertisement
6. 9
Charge Batteries Lamp
NOTE: The Battery Pack is detatched from the 1nstrument for this test. Connect the
Farnell L30 BT Stabilised Power Supply
to
the instrumm t as follows:-
(1)
One 5V d.c. output to pin 8 of the Power Connector (Power Supply No. 1).
(2)
The other 5V d .c. output to pin 7 of the Power Connector (Power Supply No.
2).
(3)
The OV output to pin 6 (OV) of the Power Connector.
(4)
Switch on the stabilised Power Supply.
(5)
Switch the OPERATE/CHECK switch to CHECK
.
(6)
Switch the Function switch to FREQUENCY or PERIOD and note that the
display operates.
(7)
Reduce the output from the stabilised Power Supply to Power
Supply
No.
until
the
'CHARGE BATTERIES' lamp on the front panel
illumirates.
(8)
Chec
k
that the output voltage from
the
stabilised Power Supply is
in
the
range
4.3 to 4.7V d.c. and verify that the display is extinguished.
PERFORMANCE
TESTS
NOTE:
If
during the Performance Tests
commencing
at para. 6.12 the
required results
are not obtainable, it may be necessary to adjust the Schmitt trigger on the
Amp I ifier and High Speed Decade Assembly (refer to para. 6. 16).
6.10 Setting-up
Internal Frequency Standard
Equipment Required:
Procedure
1 MHz
frequenc~
standard accurate
to± 1 part in 10
.
(1)
Ensure that the instrument has been switched on for at least one hour.
For
battery instruments see Note below.
(2)
Connect the 1 MHz frequency standard to the BNC input socket of tv\odel
9057 (Channel 'A
1
input socket tv\odel 9059).
(3)
Set the Function Switch
to
FREQUENCY (tv\odel 9057) or FREQUENCY
'A'
(Model 9059).
NOTE: When calibrating the frequency standard in a battery operated instrument
ensure that the battery voltage is not near the discharged level (minimun
level 4.75V). If a new battery pack is fitted the instrument should be
switched on for at least one hour before commencing calibration.
'
'
9057/9059
6-3
Advertisement
Table of Contents
