Lower position: full-octave bandwidth with automatic scanning in full-
octave steps.
RANGE:
A two-position switch to select the narrow band range, or "Linear",
for both manual and remote controlled operation. Functions are as fol-
lows:
Upper position: "Linear" range from 1 Hz to 50 kHz, independent of
the position of the MANUAL FILTER SELECTOR.
Lower position: "2 Hz to 20 kHz A-Lin.", filters are selected automati-
cally, or by the MANUAL FILTER SELECTOR.
FILTER CONTROL MODE: Two switches that control how the filters are selected, plus two LED in-
dicators,
OUTPUT:
2.2. REAR PANEL
Fuse
The left-hand switch can select "Manual" so that the filters are
chosen by the MANUAL FILTER SELECTOR or it can select "Recorder"
mode allowing filter selection to be made by external control.
The right-hand switch enables the Recorder in use to be controlled
from the Band Pass Filter. This facility is blocked when "Manual" has
been selected. Two LEDs light to indicate whether "Stop" or "Run" is
selected.
Standard B & K coaxial socket, fitting JP 0101 Plugs, paralleled by a
BNC socket on the rear panel. There is a separate ground terminal. Im-
pedance less than 200, minimum load impedance 5 kf) in parallel
with 1 nF.
Output
111.1171."-I.
11111111111111111111111111111111111111
dine Voltage
t 410
• •
Chassis li
Signal Ground
Mains Input -11111111111111111111111111111111111111
Recorder
Control 1
Fig.2.2. Rear panel connections of the Type 1618
Input
Recorder
Control II
770367/1
CHASSIS-SIGNAL-GROUND: A pair of clamping terminals with a shorting strap, permiting the signal
ground to be connected to the instrument chassis. See section 3.1.4.
LINE VOLTAGE:
Voltage selector for operation of the 1618 from 100, 115, 127, 200,
220 and 240V (50 to 400 Hz) single phase, AC mains lines. To select
the correct voltage setting see section 3.1.
10
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