Wavetek 3000 Instruction Manual page 13

OPERATION
O2
Accuracy Lamps
Indicate frequency accuracy . ±0 .001% in CW
and AM modes, ±(0 .001% + 10 kHz) in FMxl and
±(0 .001% + 45 kHz) in FMx100 .
Typically the
lamp will flash for a few seconds after power
is turned on . Under normal operation a
steady light indicates that the unit is
phase-locked and the frequency accuracy in-
dication is valid . A continuously flashing
light indicates that one or more of the phase
lock loops is open .
(The open loop can be
identified by removing the top cover and
looking for the corresponding "module fault"
light .)
O3
Output Level Meter
Indicates output level over a 10 dB range
in VRMS and dBm.
4O
Unlevel Lamp
Indicates that the output level accuracy is
not valid when the lamp is on .
O5
Attenuator Controls the output level over a140 dB range
from +10 to -130 dBm . The Attenuator dial
is calibrated in dB and VRMS .
6O
Vernier Controls the output level over an 11 dB
range .
O7
AM/FM Vernier Is calibrated from O to 5 kHz FM peak devia
tion and from 0 to 90% AM. This control per-
mits precise AM and FM settings with the
mode switch in AM and FMxlor FMx100 respec-
tively and the frequency switch in 400 Hz,
1 kHz or Ext . The vernier also serves as a
manual amplitude and frequency control with
the frequency switch in vernier . The vernier
provides up to +6 dB amplitude change when
the mode switch is in the AM and also pro-
vides up to a +5 kHz or up to +500 kHz fre-
quency change
when the
mode switch is in
FMxl and FMx100 respectively .
Frequency Switch
Selects vernier, for manual amplitude or
frequencyicontrol, 400 Hz and 1 kHz internal
modulation and external modulation .
O9
Ext
Modulation input accepts a DC to 20 kHz sig-
nal for AM and a DC to 25 kHz for FM .
A 10
V peak-to-peak signal into a 600 ohm impe
dance calibrates the AM/FM vernier full scale .
A lesser. input voltage will result in a pro-
portional full scale calibration of the AM/
FM vernier . Therefore, a 1 volt peak-to-
peak signal into 600 ohms will result in a
2-3