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Low Frequency Multiplier (Option)
1.7
An optional ILF' facility is available for measurement of low frequencies such as
audio tones.
By means of a frequency multiplication technique the resolution
below
25
kHz is improved by a factor of
100.
The Burst facility
is
not operative in the LF
mode.
If the LF mode is selected when the option is not fitted the display will show all
eights.
AGC Output
1.8
The
'N
Channel amplifier a.g.c. voltage is brought out to two pins on the rear
panel (AGCO/P) for use as a peak indication, in, for example
r
transmitter
tuning.
Check Faci
I
ities
'.9
By selecting INPUT
IN
and CHECK, the readout will display lall
8's'r
thus
checking that the segments in the numerical
'indicator~a~e
functioning correctly.
When LF or Input
'B'
and CHECK are selected an internal standc/rd frequency is measured
to provide a check of the counting and display circuits.
FREQUENCY STANDARD
1.10
Ar rhe customer's option one of three 5 MHz oscillators from the Racal-Dana range
can be fitted.
Details will be found in the Technical Specification.
Option 04C
is a discrete component oscillator, and a parts list and circuit will be found in Section
3
of
his manual.
Options 04A and 04B should be serviced only by Racal-Dana Instruments Ltd.,
_,r their agents.
For all options an aperture in the rear panel provides access for
col ibration .
.-.11
An external frequency standard, which will automatically override the internal
standard, can be appl ied via a BNC socker on the rear panel.
A I, e. d.
dicator I ights when the instrument is operating on the external standard.
1-,
(Line Power) SUPPLY
1.12
The instrument operates from a.c. supplies between 94V and 132V an,d between
188Vand265V, 45 to 450 Hz. Tappings and a link on the internal line
tl nsformer provide a choice of six voltage ranges.
A rear panel switch must be set to
st:lect either the upper or lower half of the chosen range.
Detailed instructions are given
In
Chapter 5.
It is important that the label on the rear panel indicates the selected range.
1-2
no-
Vol. 2
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