RADIOMETER BKF10, Operating Instructions Manual

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FRONT PANEL - CONTROLS and CONNECTORS
" I ''''
,..,. .- . .
1.
Distortion meter - SiN meter. I nd icates
distortion directly in
%
on upper scale
and SIN ratio in dB on lower scale.
2. HP-LP filter selector switch. Permits
measurement of, or suppression of,
hum and noise.
3. Line power ON/OFF switch. Red lamp
indicates power ON.
4.
Lamp warns when indicated ratio is
NEGATIVE dB.
5. Input/Output Ratio meter. Indicates
gain or loss of device under test in
dB.
6. Lamp warns when MAX. INPUT switch
is set to 30 V/10 kfl setting. Add 20 dB
to reading.
7.
Push button for start of built-in single
frequency sweep function.
8. Oscillator function selector switch. Se­
lects SINGLE SWEEP function. EX­
Ternal function or MANual freq. set­
ting.
OPERATING INSTRUCTIONS
The identification numbers in parentheses
refer to the circled numbers in Figs. 1
and 5.
BEFORE USE
Before connecting the BKF10 to the line
supply, ensure the following:
Check line voltage selector (24) and line
supply fuse (see REAR PANEL CONNEC­
TORS page 4). To change: remove plate,
switch to alternative line voltage and re­
place plate. Line fuse values are printed
below fuse holder.
1.
Plug line cord into receptacle (26),
connect to supply and depress POWER
switch (3) to switch on. Red lamp in­
dicates power ON.
2. If the instrument is to be used on a
work table, pull down the stand fitted
under the front of the bottom plate.
It will be found easier to read the
meters In this position.
Fig.
1.
9.
Input Frequency meter. Indicates the
frequency of signal present at the in­
put of the BKF10.
10. INPUT connector (BNC).
11. Lamp warns if signal present at INPUT
is either too low or too high. Check
setting of MAX. INPUT switch.
12. MAX. INPUT selector switch. Sensi­
tivity in 3 V/1 Mfl setting: 10 mV to
3 V. Sensitivity in 30 V/10 kfl setting
(20 dB attenuator switched into input
circuit): 100 mV to 30 V.
13. SIN pushbutton. Depress button and
read off SiN ratio directly on dB scale
of Distortion Meter.
14. Lamp warns when VERNIER control is
turned off calibrated (CAL) position
(fully counter-clockwise).
15. VERNIER control for level control
switch settings. Increases OUTPUT up
to 10 dB above that of Level Control
switch (16) setting (OUTPUT deterio-
3. Always ensure adequate ventilation for
the cooling fins (29) on the rear panel.
4.
The GREEN
f
jack located to the
right of the line fuse is used to ground
the BKF10 if it is not grounded through
the power cord. To obtain reliable
measurements, it is essential that the
instrument be properly grounded. This
jack is also connected to the centre
pin of the line cord receptacle (26)
and to pin 6 of the multi connector
(28).
Note:
This jack should
NOT
be used
as a substitute for the four common
signal GROUND jacks (22).
OU''''' (,NO
rates above 1 V) with LEVEL AT switch
(17) in OUTPUT position. Increases IN­
PUT similarly with LEVEL AT switch
(17) in INPUT position.
16. LEVEL CONTROL switch. Outer scale
refers to voltage level at INPUT con­
nector. Inner scale refers to voltage
level at OUTPUT connector.
EXT. setting permits external dc ana­
logue control of BKF10 output or input
voltage.
17. Selector switch for constant INPUT
level to, or constant OUTPUT level
from, BKF10.
18. Manual frequency control of oscillator
when oscillator function switch is set
to MAN.
19. Lamp warns when OUTPUT from
BKF10 is too low or too high (1 mV to
1 V). Check settings of MAX. INPUT
switch and LEVEL CONTROL switChl
VERNIER.
20. OUTPUT connector (600
Q)
(BNC).
BASIC OPERATING ROUTINE
This routine uses both the Distortion Meter
and the built-in oscillator of the BKF10.
1. Connect the device under test to the
BKF10, using screened leads as shown
below.
INPUT
BKFIO
OUTPUT
DEVICE UNDER
,,:<J
IN
Fig. 2.